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// #################################################################################################
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// # << NEORV32: neorv32_uart.c - Universal Asynchronous Receiver/Transmitter (UART) HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2022, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file neorv32_uart.c
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* @author Stephan Nolting
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* @brief Universal asynchronous receiver/transmitter (UART0/UART1) HW driver source file.
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*
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* @warning UART0 (primary UART) is used as default user console interface for all NEORV32 software framework/library functions.
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*
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* @note These functions should only be used if the UART0/UART1 unit was synthesized (IO_UART0_EN = true / IO_UART1_EN = true).
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_uart.h"
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#include <string.h>
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#include <stdarg.h>
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/// \cond
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// Private functions
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static void __neorv32_uart_itoa(uint32_t x, char *res) __attribute__((unused)); // GCC: do not output a warning when this variable is unused
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static void __neorv32_uart_tohex(uint32_t x, char *res) __attribute__((unused)); // GCC: do not output a warning when this variable is unused
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static void __neorv32_uart_touppercase(uint32_t len, char *ptr) __attribute__((unused)); // GCC: do not output a warning when this variable is unused
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/// \endcond
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// #################################################################################################
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// Primary UART (UART0)
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// #################################################################################################
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/**********************************************************************//**
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* Check if UART0 unit was synthesized.
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*
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* @return 0 if UART0 was not synthesized, 1 if UART0 is available.
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**************************************************************************/
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int neorv32_uart0_available(void) {
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if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_IO_UART0)) {
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return 1;
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}
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else {
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return 0;
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}
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}
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/**********************************************************************//**
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* Enable and configure primary UART (UART0).
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*
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* @note The 'UART0_SIM_MODE' compiler flag will configure UART0 for simulation mode: all UART0 TX data will be redirected to simulation output. Use this for simulations only!
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* @note To enable simulation mode add <USER_FLAGS+=-DUART0_SIM_MODE> when compiling.
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*
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* @warning The baud rate is computed using INTEGER operations (truncation errors might occur).
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*
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* @param[in] baudrate Targeted BAUD rate (e.g. 9600).
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* @param[in] parity Parity configuration (00=off, 10=even, 11=odd), see #NEORV32_UART_PARITY_enum.
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* @param[in] flow_con Hardware flow control configuration (00=off, 01=RTS, 10=CTS, 11=RTS/CTS), see #NEORV32_UART_FLOW_CONTROL_enum.
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**************************************************************************/
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void neorv32_uart0_setup(uint32_t baudrate, uint8_t parity, uint8_t flow_con) {
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NEORV32_UART0.CTRL = 0; // reset
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uint32_t clock = NEORV32_SYSINFO.CLK;
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uint16_t i = 0; // BAUD rate divisor
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uint8_t p = 0; // initial prsc = CLK/2
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// raw clock prescaler
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#ifndef make_bootloader
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// use div instructions
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i = (uint16_t)(clock / (2*baudrate));
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#else
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// division via repeated subtraction (minimal size, only for bootloader)
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while (clock >= 2*baudrate) {
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clock -= 2*baudrate;
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i++;
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}
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#endif
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// find baud prescaler (12-bit wide))
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while (i >= 0x0fff) {
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if ((p == 2) || (p == 4))
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i >>= 3;
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else
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i >>= 1;
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p++;
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}
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uint32_t clk_prsc = (uint32_t)p;
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clk_prsc = clk_prsc << UART_CTRL_PRSC0;
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uint32_t baud_prsc = (uint32_t)i;
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baud_prsc = baud_prsc - 1;
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baud_prsc = baud_prsc << UART_CTRL_BAUD00;
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uint32_t uart_en = 1;
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uart_en = uart_en << UART_CTRL_EN;
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uint32_t parity_config = (uint32_t)(parity & 3);
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parity_config = parity_config << UART_CTRL_PMODE0;
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uint32_t flow_control = (uint32_t)(flow_con & 3);
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flow_control = flow_control << UART_CTRL_RTS_EN;
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/* Enable UART0 for SIM mode. */
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/* USE THIS ONLY FOR SIMULATION! */
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#ifdef UART_SIM_MODE
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#warning <UART_SIM_MODE> is obsolete (but still supported for compatibility). Please consider using the new flag <UART0_SIM_MODE>.
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#endif
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#if defined UART0_SIM_MODE || defined UART_SIM_MODE
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#warning UART0_SIM_MODE (primary UART) enabled! Sending all UART0.TX data to text.io simulation output instead of real UART0 transmitter. Use this for simulations only!
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uint32_t sim_mode = 1 << UART_CTRL_SIM_MODE;
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#else
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uint32_t sim_mode = 0;
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#endif
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NEORV32_UART0.CTRL = clk_prsc | baud_prsc | uart_en | parity_config | sim_mode | flow_control;
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}
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/**********************************************************************//**
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* Disable UART0.
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**************************************************************************/
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void neorv32_uart0_disable(void) {
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NEORV32_UART0.CTRL &= ~((uint32_t)(1 << UART_CTRL_EN));
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}
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/**********************************************************************//**
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* Enable UART0.
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**************************************************************************/
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void neorv32_uart0_enable(void) {
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NEORV32_UART0.CTRL |= ((uint32_t)(1 << UART_CTRL_EN));
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}
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/**********************************************************************//**
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* Send single char via UART0.
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*
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* @note This function is blocking.
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*
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* @param[in] c Char to be send.
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**************************************************************************/
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void neorv32_uart0_putc(char c) {
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// wait for previous transfer to finish
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while ((NEORV32_UART0.CTRL & (1<<UART_CTRL_TX_FULL)) != 0); // wait for space in TX FIFO
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NEORV32_UART0.DATA = ((uint32_t)c) << UART_DATA_LSB;
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}
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/**********************************************************************//**
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* Check if UART0 TX is busy (transmitter busy or data left in TX buffer).
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*
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* @note This function is blocking.
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*
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* @return 0 if idle, 1 if busy
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**************************************************************************/
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int neorv32_uart0_tx_busy(void) {
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uint32_t ctrl = NEORV32_UART0.CTRL;
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if (((ctrl & (1<<UART_CTRL_TX_BUSY)) != 0) || // TX engine busy
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((ctrl & (1<<UART_CTRL_TX_EMPTY)) == 0)) { // TX buffer not empty
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return 1;
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}
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return 0;
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}
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/**********************************************************************//**
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* Get char from UART0.
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*
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* @note This function is blocking and does not check for UART frame/parity errors.
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*
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* @return Received char.
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**************************************************************************/
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char neorv32_uart0_getc(void) {
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uint32_t d = 0;
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while (1) {
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215 |
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d = NEORV32_UART0.DATA;
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if ((d & (1<<UART_DATA_AVAIL)) != 0) { // char received?
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return (char)d;
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}
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219 |
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}
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220 |
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}
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221 |
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222 |
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223 |
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/**********************************************************************//**
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* Get char from UART0 (and check errors).
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225 |
2 |
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*
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226 |
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* @note This function is non-blocking and checks for frame and parity errors.
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*
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228 |
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* @param[in,out] data Received char.
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* @return Status code:
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230 |
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* 0 = char received without errors
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231 |
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* -1 = nothing received
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232 |
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* -2 = char received with frame error
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233 |
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* -3 = char received with parity error
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234 |
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* -4 = char received with overrun error.
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235 |
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zero_gravi |
**************************************************************************/
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236 |
51 |
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int neorv32_uart0_getc_safe(char *data) {
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237 |
42 |
zero_gravi |
|
238 |
64 |
zero_gravi |
uint32_t uart_rx = NEORV32_UART0.DATA;
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239 |
42 |
zero_gravi |
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240 |
65 |
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// get received byte (if there is any)
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241 |
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*data = (char)uart_rx;
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242 |
42 |
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243 |
65 |
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// check if no data available at all
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244 |
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if ((uart_rx & (1<<UART_DATA_AVAIL)) == 0) {
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245 |
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return -1;
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246 |
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}
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247 |
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248 |
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// check for frame error
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249 |
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if (uart_rx & (1<<UART_DATA_FERR)) {
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250 |
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return -2;
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251 |
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}
|
252 |
42 |
zero_gravi |
|
253 |
65 |
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// check for parity error
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254 |
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if (uart_rx & (1<<UART_DATA_PERR)) {
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255 |
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return -3;
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256 |
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}
|
257 |
42 |
zero_gravi |
|
258 |
65 |
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// check for overrun error
|
259 |
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if (uart_rx & (1<<UART_DATA_OVERR)) {
|
260 |
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return -4;
|
261 |
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}
|
262 |
42 |
zero_gravi |
|
263 |
65 |
zero_gravi |
return 0; // all fine
|
264 |
42 |
zero_gravi |
}
|
265 |
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|
266 |
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267 |
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/**********************************************************************//**
|
268 |
50 |
zero_gravi |
* Check if UART0 has received a char.
|
269 |
42 |
zero_gravi |
*
|
270 |
2 |
zero_gravi |
* @note This function is non-blocking.
|
271 |
50 |
zero_gravi |
* @note Use neorv32_uart0_char_received_get(void) to get the char.
|
272 |
2 |
zero_gravi |
*
|
273 |
|
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* @return =!0 when a char has been received.
|
274 |
|
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**************************************************************************/
|
275 |
50 |
zero_gravi |
int neorv32_uart0_char_received(void) {
|
276 |
2 |
zero_gravi |
|
277 |
64 |
zero_gravi |
if ((NEORV32_UART0.DATA & (1<<UART_DATA_AVAIL)) != 0) {
|
278 |
2 |
zero_gravi |
return 1;
|
279 |
|
|
}
|
280 |
|
|
else {
|
281 |
|
|
return 0;
|
282 |
|
|
}
|
283 |
|
|
}
|
284 |
|
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|
285 |
|
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|
286 |
|
|
/**********************************************************************//**
|
287 |
50 |
zero_gravi |
* Get a received char from UART0.
|
288 |
2 |
zero_gravi |
*
|
289 |
|
|
* @note This function is non-blocking.
|
290 |
|
|
* @note Should only be used in combination with neorv32_uart_char_received(void).
|
291 |
|
|
*
|
292 |
|
|
* @return Received char.
|
293 |
|
|
**************************************************************************/
|
294 |
50 |
zero_gravi |
char neorv32_uart0_char_received_get(void) {
|
295 |
2 |
zero_gravi |
|
296 |
64 |
zero_gravi |
return (char)NEORV32_UART0.DATA;
|
297 |
2 |
zero_gravi |
}
|
298 |
|
|
|
299 |
|
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|
300 |
|
|
/**********************************************************************//**
|
301 |
50 |
zero_gravi |
* Print string (zero-terminated) via UART0. Print full line break "\r\n" for every '\n'.
|
302 |
2 |
zero_gravi |
*
|
303 |
|
|
* @note This function is blocking.
|
304 |
|
|
*
|
305 |
|
|
* @param[in] s Pointer to string.
|
306 |
|
|
**************************************************************************/
|
307 |
50 |
zero_gravi |
void neorv32_uart0_print(const char *s) {
|
308 |
2 |
zero_gravi |
|
309 |
|
|
char c = 0;
|
310 |
|
|
while ((c = *s++)) {
|
311 |
|
|
if (c == '\n') {
|
312 |
50 |
zero_gravi |
neorv32_uart0_putc('\r');
|
313 |
2 |
zero_gravi |
}
|
314 |
50 |
zero_gravi |
neorv32_uart0_putc(c);
|
315 |
2 |
zero_gravi |
}
|
316 |
|
|
}
|
317 |
|
|
|
318 |
|
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|
319 |
|
|
/**********************************************************************//**
|
320 |
50 |
zero_gravi |
* Custom version of 'printf' function using UART0.
|
321 |
2 |
zero_gravi |
*
|
322 |
50 |
zero_gravi |
* @note This function is blocking.
|
323 |
|
|
*
|
324 |
|
|
* @param[in] format Pointer to format string.
|
325 |
|
|
*
|
326 |
|
|
* <TABLE>
|
327 |
|
|
* <TR><TD>%s</TD><TD>String (array of chars, zero-terminated)</TD></TR>
|
328 |
|
|
* <TR><TD>%c</TD><TD>Single char</TD></TR>
|
329 |
72 |
zero_gravi |
* <TR><TD>%d/%i</TD><TD>32-bit signed number, printed as decimal</TD></TR>
|
330 |
50 |
zero_gravi |
* <TR><TD>%u</TD><TD>32-bit unsigned number, printed as decimal</TD></TR>
|
331 |
72 |
zero_gravi |
* <TR><TD>%x</TD><TD>32-bit number, printed as 8-char hexadecimal - lower-case</TD></TR>
|
332 |
|
|
* <TR><TD>%X</TD><TD>32-bit number, printed as 8-char hexadecimal - upper-case</TD></TR>
|
333 |
|
|
* <TR><TD>%p</TD><TD>32-bit pointer, printed as 8-char hexadecimal - lower-case</TD></TR>
|
334 |
50 |
zero_gravi |
* </TABLE>
|
335 |
2 |
zero_gravi |
**************************************************************************/
|
336 |
50 |
zero_gravi |
void neorv32_uart0_printf(const char *format, ...) {
|
337 |
2 |
zero_gravi |
|
338 |
50 |
zero_gravi |
char c, string_buf[11];
|
339 |
|
|
int32_t n;
|
340 |
2 |
zero_gravi |
|
341 |
50 |
zero_gravi |
va_list a;
|
342 |
|
|
va_start(a, format);
|
343 |
2 |
zero_gravi |
|
344 |
50 |
zero_gravi |
while ((c = *format++)) {
|
345 |
|
|
if (c == '%') {
|
346 |
|
|
c = *format++;
|
347 |
|
|
switch (c) {
|
348 |
|
|
case 's': // string
|
349 |
|
|
neorv32_uart0_print(va_arg(a, char*));
|
350 |
|
|
break;
|
351 |
|
|
case 'c': // char
|
352 |
|
|
neorv32_uart0_putc((char)va_arg(a, int));
|
353 |
|
|
break;
|
354 |
|
|
case 'i': // 32-bit signed
|
355 |
72 |
zero_gravi |
case 'd':
|
356 |
50 |
zero_gravi |
n = (int32_t)va_arg(a, int32_t);
|
357 |
|
|
if (n < 0) {
|
358 |
|
|
n = -n;
|
359 |
|
|
neorv32_uart0_putc('-');
|
360 |
|
|
}
|
361 |
|
|
__neorv32_uart_itoa((uint32_t)n, string_buf);
|
362 |
|
|
neorv32_uart0_print(string_buf);
|
363 |
|
|
break;
|
364 |
|
|
case 'u': // 32-bit unsigned
|
365 |
|
|
__neorv32_uart_itoa(va_arg(a, uint32_t), string_buf);
|
366 |
|
|
neorv32_uart0_print(string_buf);
|
367 |
|
|
break;
|
368 |
|
|
case 'x': // 32-bit hexadecimal
|
369 |
72 |
zero_gravi |
case 'p':
|
370 |
|
|
case 'X':
|
371 |
50 |
zero_gravi |
__neorv32_uart_tohex(va_arg(a, uint32_t), string_buf);
|
372 |
72 |
zero_gravi |
if (c == 'X') {
|
373 |
|
|
__neorv32_uart_touppercase(11, string_buf);
|
374 |
|
|
}
|
375 |
50 |
zero_gravi |
neorv32_uart0_print(string_buf);
|
376 |
|
|
break;
|
377 |
55 |
zero_gravi |
default: // unsupported format
|
378 |
|
|
neorv32_uart0_putc('%');
|
379 |
|
|
neorv32_uart0_putc(c);
|
380 |
|
|
break;
|
381 |
50 |
zero_gravi |
}
|
382 |
|
|
}
|
383 |
|
|
else {
|
384 |
|
|
if (c == '\n') {
|
385 |
|
|
neorv32_uart0_putc('\r');
|
386 |
|
|
}
|
387 |
|
|
neorv32_uart0_putc(c);
|
388 |
|
|
}
|
389 |
2 |
zero_gravi |
}
|
390 |
50 |
zero_gravi |
va_end(a);
|
391 |
|
|
}
|
392 |
2 |
zero_gravi |
|
393 |
50 |
zero_gravi |
|
394 |
|
|
/**********************************************************************//**
|
395 |
|
|
* Simplified custom version of 'scanf' function for UART0.
|
396 |
|
|
*
|
397 |
|
|
* @note This function is blocking.
|
398 |
|
|
*
|
399 |
|
|
* @param[in,out] buffer Pointer to array of chars to store string.
|
400 |
|
|
* @param[in] max_size Maximum number of chars to sample.
|
401 |
|
|
* @param[in] echo Echo UART input when 1.
|
402 |
|
|
* @return Number of chars read.
|
403 |
|
|
**************************************************************************/
|
404 |
|
|
int neorv32_uart0_scan(char *buffer, int max_size, int echo) {
|
405 |
|
|
|
406 |
|
|
char c = 0;
|
407 |
|
|
int length = 0;
|
408 |
|
|
|
409 |
|
|
while (1) {
|
410 |
|
|
c = neorv32_uart0_getc();
|
411 |
|
|
if (c == '\b') { // BACKSPACE
|
412 |
|
|
if (length != 0) {
|
413 |
|
|
if (echo) {
|
414 |
|
|
neorv32_uart0_print("\b \b"); // delete last char in console
|
415 |
|
|
}
|
416 |
|
|
buffer--;
|
417 |
|
|
length--;
|
418 |
|
|
}
|
419 |
|
|
}
|
420 |
|
|
else if (c == '\r') // carriage return
|
421 |
2 |
zero_gravi |
break;
|
422 |
50 |
zero_gravi |
else if ((c >= ' ') && (c <= '~') && (length < (max_size-1))) {
|
423 |
|
|
if (echo) {
|
424 |
|
|
neorv32_uart0_putc(c); // echo
|
425 |
|
|
}
|
426 |
|
|
*buffer++ = c;
|
427 |
|
|
length++;
|
428 |
|
|
}
|
429 |
2 |
zero_gravi |
}
|
430 |
50 |
zero_gravi |
*buffer = '\0'; // terminate string
|
431 |
2 |
zero_gravi |
|
432 |
50 |
zero_gravi |
return length;
|
433 |
|
|
}
|
434 |
2 |
zero_gravi |
|
435 |
50 |
zero_gravi |
|
436 |
|
|
|
437 |
|
|
// #################################################################################################
|
438 |
|
|
// Secondary UART (UART1)
|
439 |
|
|
// #################################################################################################
|
440 |
|
|
|
441 |
|
|
/**********************************************************************//**
|
442 |
|
|
* Check if UART1 unit was synthesized.
|
443 |
|
|
*
|
444 |
|
|
* @return 0 if UART1 was not synthesized, 1 if UART1 is available.
|
445 |
|
|
**************************************************************************/
|
446 |
|
|
int neorv32_uart1_available(void) {
|
447 |
|
|
|
448 |
64 |
zero_gravi |
if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_IO_UART1)) {
|
449 |
50 |
zero_gravi |
return 1;
|
450 |
|
|
}
|
451 |
|
|
else {
|
452 |
|
|
return 0;
|
453 |
|
|
}
|
454 |
2 |
zero_gravi |
}
|
455 |
|
|
|
456 |
|
|
|
457 |
|
|
/**********************************************************************//**
|
458 |
50 |
zero_gravi |
* Enable and configure secondary UART (UART1).
|
459 |
2 |
zero_gravi |
*
|
460 |
50 |
zero_gravi |
* @note The 'UART1_SIM_MODE' compiler flag will configure UART1 for simulation mode: all UART1 TX data will be redirected to simulation output. Use this for simulations only!
|
461 |
|
|
* @note To enable simulation mode add <USER_FLAGS+=-DUART1_SIM_MODE> when compiling.
|
462 |
|
|
*
|
463 |
|
|
* @warning The baud rate is computed using INTEGER operations (truncation errors might occur).
|
464 |
|
|
*
|
465 |
|
|
* @param[in] baudrate Targeted BAUD rate (e.g. 9600).
|
466 |
51 |
zero_gravi |
* @param[in] parity Parity configuration (00=off, 10=even, 11=odd), see #NEORV32_UART_PARITY_enum.
|
467 |
|
|
* @param[in] flow_con Hardware flow control configuration (00=off, 01=RTS, 10=CTS, 11=RTS/CTS), see #NEORV32_UART_FLOW_CONTROL_enum.
|
468 |
2 |
zero_gravi |
**************************************************************************/
|
469 |
51 |
zero_gravi |
void neorv32_uart1_setup(uint32_t baudrate, uint8_t parity, uint8_t flow_con) {
|
470 |
2 |
zero_gravi |
|
471 |
64 |
zero_gravi |
NEORV32_UART1.CTRL = 0; // reset
|
472 |
2 |
zero_gravi |
|
473 |
64 |
zero_gravi |
uint32_t clock = NEORV32_SYSINFO.CLK;
|
474 |
50 |
zero_gravi |
uint16_t i = 0; // BAUD rate divisor
|
475 |
|
|
uint8_t p = 0; // initial prsc = CLK/2
|
476 |
|
|
|
477 |
|
|
// raw clock prescaler
|
478 |
72 |
zero_gravi |
#ifndef make_bootloader
|
479 |
50 |
zero_gravi |
// use div instructions
|
480 |
|
|
i = (uint16_t)(clock / (2*baudrate));
|
481 |
|
|
#else
|
482 |
66 |
zero_gravi |
// division via repeated subtraction (minimal size, only for bootloader)
|
483 |
50 |
zero_gravi |
while (clock >= 2*baudrate) {
|
484 |
|
|
clock -= 2*baudrate;
|
485 |
|
|
i++;
|
486 |
2 |
zero_gravi |
}
|
487 |
50 |
zero_gravi |
#endif
|
488 |
2 |
zero_gravi |
|
489 |
50 |
zero_gravi |
// find baud prescaler (12-bit wide))
|
490 |
|
|
while (i >= 0x0fff) {
|
491 |
|
|
if ((p == 2) || (p == 4))
|
492 |
|
|
i >>= 3;
|
493 |
|
|
else
|
494 |
|
|
i >>= 1;
|
495 |
|
|
p++;
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
uint32_t clk_prsc = (uint32_t)p;
|
499 |
64 |
zero_gravi |
clk_prsc = clk_prsc << UART_CTRL_PRSC0;
|
500 |
50 |
zero_gravi |
|
501 |
|
|
uint32_t baud_prsc = (uint32_t)i;
|
502 |
|
|
baud_prsc = baud_prsc - 1;
|
503 |
64 |
zero_gravi |
baud_prsc = baud_prsc << UART_CTRL_BAUD00;
|
504 |
50 |
zero_gravi |
|
505 |
|
|
uint32_t uart_en = 1;
|
506 |
64 |
zero_gravi |
uart_en = uart_en << UART_CTRL_EN;
|
507 |
50 |
zero_gravi |
|
508 |
|
|
uint32_t parity_config = (uint32_t)(parity & 3);
|
509 |
64 |
zero_gravi |
parity_config = parity_config << UART_CTRL_PMODE0;
|
510 |
50 |
zero_gravi |
|
511 |
51 |
zero_gravi |
uint32_t flow_control = (uint32_t)(flow_con & 3);
|
512 |
64 |
zero_gravi |
flow_control = flow_control << UART_CTRL_RTS_EN;
|
513 |
51 |
zero_gravi |
|
514 |
50 |
zero_gravi |
/* Enable UART1 for SIM mode. */
|
515 |
|
|
/* USE THIS ONLY FOR SIMULATION! */
|
516 |
|
|
#ifdef UART1_SIM_MODE
|
517 |
|
|
#warning UART1_SIM_MODE (secondary UART) enabled! Sending all UART1.TX data to text.io simulation output instead of real UART1 transmitter. Use this for simulations only!
|
518 |
64 |
zero_gravi |
uint32_t sim_mode = 1 << UART_CTRL_SIM_MODE;
|
519 |
50 |
zero_gravi |
#else
|
520 |
|
|
uint32_t sim_mode = 0;
|
521 |
|
|
#endif
|
522 |
|
|
|
523 |
64 |
zero_gravi |
NEORV32_UART1.CTRL = clk_prsc | baud_prsc | uart_en | parity_config | sim_mode | flow_control;
|
524 |
2 |
zero_gravi |
}
|
525 |
|
|
|
526 |
|
|
|
527 |
|
|
/**********************************************************************//**
|
528 |
50 |
zero_gravi |
* Disable UART1.
|
529 |
|
|
**************************************************************************/
|
530 |
|
|
void neorv32_uart1_disable(void) {
|
531 |
|
|
|
532 |
64 |
zero_gravi |
NEORV32_UART1.CTRL &= ~((uint32_t)(1 << UART_CTRL_EN));
|
533 |
50 |
zero_gravi |
}
|
534 |
|
|
|
535 |
|
|
|
536 |
|
|
/**********************************************************************//**
|
537 |
61 |
zero_gravi |
* Enable UART1.
|
538 |
|
|
**************************************************************************/
|
539 |
|
|
void neorv32_uart1_enable(void) {
|
540 |
|
|
|
541 |
64 |
zero_gravi |
NEORV32_UART1.CTRL |= ((uint32_t)(1 << UART_CTRL_EN));
|
542 |
61 |
zero_gravi |
}
|
543 |
|
|
|
544 |
|
|
|
545 |
|
|
/**********************************************************************//**
|
546 |
50 |
zero_gravi |
* Send single char via UART1.
|
547 |
2 |
zero_gravi |
*
|
548 |
|
|
* @note This function is blocking.
|
549 |
|
|
*
|
550 |
50 |
zero_gravi |
* @param[in] c Char to be send.
|
551 |
|
|
**************************************************************************/
|
552 |
|
|
void neorv32_uart1_putc(char c) {
|
553 |
|
|
|
554 |
|
|
// wait for previous transfer to finish
|
555 |
65 |
zero_gravi |
while ((NEORV32_UART1.CTRL & (1<<UART_CTRL_TX_FULL)) != 0); // wait for space in TX FIFO
|
556 |
64 |
zero_gravi |
NEORV32_UART1.DATA = ((uint32_t)c) << UART_DATA_LSB;
|
557 |
50 |
zero_gravi |
}
|
558 |
|
|
|
559 |
|
|
|
560 |
|
|
/**********************************************************************//**
|
561 |
65 |
zero_gravi |
* Check if UART1 TX is busy (transmitter busy or data left in TX buffer).
|
562 |
50 |
zero_gravi |
*
|
563 |
|
|
* @note This function is blocking.
|
564 |
|
|
*
|
565 |
|
|
* @return 0 if idle, 1 if busy
|
566 |
|
|
**************************************************************************/
|
567 |
|
|
int neorv32_uart1_tx_busy(void) {
|
568 |
|
|
|
569 |
65 |
zero_gravi |
uint32_t ctrl = NEORV32_UART1.CTRL;
|
570 |
|
|
|
571 |
|
|
if (((ctrl & (1<<UART_CTRL_TX_BUSY)) != 0) || // TX engine busy
|
572 |
|
|
((ctrl & (1<<UART_CTRL_TX_EMPTY)) == 0)) { // TX buffer not empty
|
573 |
50 |
zero_gravi |
return 1;
|
574 |
|
|
}
|
575 |
|
|
return 0;
|
576 |
|
|
}
|
577 |
|
|
|
578 |
|
|
|
579 |
|
|
/**********************************************************************//**
|
580 |
|
|
* Get char from UART1.
|
581 |
|
|
*
|
582 |
|
|
* @note This function is blocking and does not check for UART frame/parity errors.
|
583 |
|
|
*
|
584 |
|
|
* @return Received char.
|
585 |
|
|
**************************************************************************/
|
586 |
|
|
char neorv32_uart1_getc(void) {
|
587 |
|
|
|
588 |
|
|
uint32_t d = 0;
|
589 |
|
|
while (1) {
|
590 |
64 |
zero_gravi |
d = NEORV32_UART1.DATA;
|
591 |
50 |
zero_gravi |
if ((d & (1<<UART_DATA_AVAIL)) != 0) { // char received?
|
592 |
|
|
return (char)d;
|
593 |
|
|
}
|
594 |
|
|
}
|
595 |
|
|
}
|
596 |
|
|
|
597 |
|
|
|
598 |
|
|
/**********************************************************************//**
|
599 |
|
|
* Get char from UART1 (and check errors).
|
600 |
|
|
*
|
601 |
|
|
* @note This function is non-blocking and checks for frame and parity errors.
|
602 |
|
|
*
|
603 |
|
|
* @param[in,out] data Received char.
|
604 |
65 |
zero_gravi |
* @return Status code:
|
605 |
|
|
* 0 = char received without errors
|
606 |
|
|
* -1 = nothing received
|
607 |
|
|
* -2 = char received with frame error
|
608 |
|
|
* -3 = char received with parity error
|
609 |
|
|
* -4 = char received with overrun error.
|
610 |
50 |
zero_gravi |
**************************************************************************/
|
611 |
51 |
zero_gravi |
int neorv32_uart1_getc_safe(char *data) {
|
612 |
50 |
zero_gravi |
|
613 |
64 |
zero_gravi |
uint32_t uart_rx = NEORV32_UART1.DATA;
|
614 |
50 |
zero_gravi |
|
615 |
65 |
zero_gravi |
// get received byte (if there is any)
|
616 |
|
|
*data = (char)uart_rx;
|
617 |
50 |
zero_gravi |
|
618 |
65 |
zero_gravi |
// check if no data available at all
|
619 |
|
|
if ((uart_rx & (1<<UART_DATA_AVAIL)) == 0) {
|
620 |
|
|
return -1;
|
621 |
|
|
}
|
622 |
50 |
zero_gravi |
|
623 |
65 |
zero_gravi |
// check for frame error
|
624 |
|
|
if (uart_rx & (1<<UART_DATA_FERR)) {
|
625 |
|
|
return -2;
|
626 |
|
|
}
|
627 |
50 |
zero_gravi |
|
628 |
65 |
zero_gravi |
// check for parity error
|
629 |
|
|
if (uart_rx & (1<<UART_DATA_PERR)) {
|
630 |
|
|
return -3;
|
631 |
|
|
}
|
632 |
50 |
zero_gravi |
|
633 |
65 |
zero_gravi |
// check for overrun error
|
634 |
|
|
if (uart_rx & (1<<UART_DATA_OVERR)) {
|
635 |
|
|
return -4;
|
636 |
|
|
}
|
637 |
50 |
zero_gravi |
|
638 |
65 |
zero_gravi |
return 0; // all fine
|
639 |
50 |
zero_gravi |
}
|
640 |
|
|
|
641 |
|
|
|
642 |
|
|
/**********************************************************************//**
|
643 |
|
|
* Check if UART1 has received a char.
|
644 |
|
|
*
|
645 |
|
|
* @note This function is non-blocking.
|
646 |
|
|
* @note Use neorv32_uart0_char_received_get(void) to get the char.
|
647 |
|
|
*
|
648 |
|
|
* @return =!0 when a char has been received.
|
649 |
|
|
**************************************************************************/
|
650 |
|
|
int neorv32_uart1_char_received(void) {
|
651 |
|
|
|
652 |
64 |
zero_gravi |
if ((NEORV32_UART1.DATA & (1<<UART_DATA_AVAIL)) != 0) {
|
653 |
50 |
zero_gravi |
return 1;
|
654 |
|
|
}
|
655 |
|
|
else {
|
656 |
|
|
return 0;
|
657 |
|
|
}
|
658 |
|
|
}
|
659 |
|
|
|
660 |
|
|
|
661 |
|
|
/**********************************************************************//**
|
662 |
|
|
* Get a received char from UART1.
|
663 |
|
|
*
|
664 |
|
|
* @note This function is non-blocking.
|
665 |
|
|
* @note Should only be used in combination with neorv32_uart_char_received(void).
|
666 |
|
|
*
|
667 |
|
|
* @return Received char.
|
668 |
|
|
**************************************************************************/
|
669 |
|
|
char neorv32_uart1_char_received_get(void) {
|
670 |
|
|
|
671 |
64 |
zero_gravi |
return (char)NEORV32_UART1.DATA;
|
672 |
50 |
zero_gravi |
}
|
673 |
|
|
|
674 |
|
|
|
675 |
|
|
/**********************************************************************//**
|
676 |
|
|
* Print string (zero-terminated) via UART1. Print full line break "\r\n" for every '\n'.
|
677 |
|
|
*
|
678 |
|
|
* @note This function is blocking.
|
679 |
|
|
*
|
680 |
|
|
* @param[in] s Pointer to string.
|
681 |
|
|
**************************************************************************/
|
682 |
|
|
void neorv32_uart1_print(const char *s) {
|
683 |
|
|
|
684 |
|
|
char c = 0;
|
685 |
|
|
while ((c = *s++)) {
|
686 |
|
|
if (c == '\n') {
|
687 |
|
|
neorv32_uart1_putc('\r');
|
688 |
|
|
}
|
689 |
|
|
neorv32_uart1_putc(c);
|
690 |
|
|
}
|
691 |
|
|
}
|
692 |
|
|
|
693 |
|
|
|
694 |
|
|
/**********************************************************************//**
|
695 |
|
|
* Custom version of 'printf' function using UART1.
|
696 |
|
|
*
|
697 |
|
|
* @note This function is blocking.
|
698 |
|
|
*
|
699 |
2 |
zero_gravi |
* @param[in] format Pointer to format string.
|
700 |
|
|
*
|
701 |
|
|
* <TABLE>
|
702 |
|
|
* <TR><TD>%s</TD><TD>String (array of chars, zero-terminated)</TD></TR>
|
703 |
|
|
* <TR><TD>%c</TD><TD>Single char</TD></TR>
|
704 |
72 |
zero_gravi |
* <TR><TD>%d/%i</TD><TD>32-bit signed number, printed as decimal</TD></TR>
|
705 |
2 |
zero_gravi |
* <TR><TD>%u</TD><TD>32-bit unsigned number, printed as decimal</TD></TR>
|
706 |
72 |
zero_gravi |
* <TR><TD>%x</TD><TD>32-bit number, printed as 8-char hexadecimal - lower-case</TD></TR>
|
707 |
|
|
* <TR><TD>%X</TD><TD>32-bit number, printed as 8-char hexadecimal - upper-case</TD></TR>
|
708 |
|
|
* <TR><TD>%p</TD><TD>32-bit pointer, printed as 8-char hexadecimal - lower-case</TD></TR>
|
709 |
2 |
zero_gravi |
* </TABLE>
|
710 |
|
|
**************************************************************************/
|
711 |
50 |
zero_gravi |
void neorv32_uart1_printf(const char *format, ...) {
|
712 |
2 |
zero_gravi |
|
713 |
|
|
char c, string_buf[11];
|
714 |
|
|
int32_t n;
|
715 |
|
|
|
716 |
|
|
va_list a;
|
717 |
|
|
va_start(a, format);
|
718 |
|
|
|
719 |
|
|
while ((c = *format++)) {
|
720 |
|
|
if (c == '%') {
|
721 |
|
|
c = *format++;
|
722 |
|
|
switch (c) {
|
723 |
|
|
case 's': // string
|
724 |
50 |
zero_gravi |
neorv32_uart1_print(va_arg(a, char*));
|
725 |
2 |
zero_gravi |
break;
|
726 |
|
|
case 'c': // char
|
727 |
50 |
zero_gravi |
neorv32_uart1_putc((char)va_arg(a, int));
|
728 |
2 |
zero_gravi |
break;
|
729 |
|
|
case 'i': // 32-bit signed
|
730 |
72 |
zero_gravi |
case 'd':
|
731 |
2 |
zero_gravi |
n = (int32_t)va_arg(a, int32_t);
|
732 |
|
|
if (n < 0) {
|
733 |
|
|
n = -n;
|
734 |
50 |
zero_gravi |
neorv32_uart1_putc('-');
|
735 |
2 |
zero_gravi |
}
|
736 |
|
|
__neorv32_uart_itoa((uint32_t)n, string_buf);
|
737 |
50 |
zero_gravi |
neorv32_uart1_print(string_buf);
|
738 |
2 |
zero_gravi |
break;
|
739 |
|
|
case 'u': // 32-bit unsigned
|
740 |
|
|
__neorv32_uart_itoa(va_arg(a, uint32_t), string_buf);
|
741 |
50 |
zero_gravi |
neorv32_uart1_print(string_buf);
|
742 |
2 |
zero_gravi |
break;
|
743 |
|
|
case 'x': // 32-bit hexadecimal
|
744 |
72 |
zero_gravi |
case 'p':
|
745 |
|
|
case 'X':
|
746 |
2 |
zero_gravi |
__neorv32_uart_tohex(va_arg(a, uint32_t), string_buf);
|
747 |
72 |
zero_gravi |
if (c == 'X') {
|
748 |
|
|
__neorv32_uart_touppercase(11, string_buf);
|
749 |
|
|
}
|
750 |
50 |
zero_gravi |
neorv32_uart1_print(string_buf);
|
751 |
2 |
zero_gravi |
break;
|
752 |
55 |
zero_gravi |
default: // unsupported format
|
753 |
|
|
neorv32_uart1_putc('%');
|
754 |
|
|
neorv32_uart1_putc(c);
|
755 |
|
|
break;
|
756 |
2 |
zero_gravi |
}
|
757 |
|
|
}
|
758 |
|
|
else {
|
759 |
|
|
if (c == '\n') {
|
760 |
50 |
zero_gravi |
neorv32_uart1_putc('\r');
|
761 |
2 |
zero_gravi |
}
|
762 |
50 |
zero_gravi |
neorv32_uart1_putc(c);
|
763 |
2 |
zero_gravi |
}
|
764 |
|
|
}
|
765 |
|
|
va_end(a);
|
766 |
|
|
}
|
767 |
|
|
|
768 |
|
|
|
769 |
|
|
/**********************************************************************//**
|
770 |
50 |
zero_gravi |
* Simplified custom version of 'scanf' function for UART1.
|
771 |
2 |
zero_gravi |
*
|
772 |
|
|
* @note This function is blocking.
|
773 |
|
|
*
|
774 |
|
|
* @param[in,out] buffer Pointer to array of chars to store string.
|
775 |
|
|
* @param[in] max_size Maximum number of chars to sample.
|
776 |
|
|
* @param[in] echo Echo UART input when 1.
|
777 |
|
|
* @return Number of chars read.
|
778 |
|
|
**************************************************************************/
|
779 |
50 |
zero_gravi |
int neorv32_uart1_scan(char *buffer, int max_size, int echo) {
|
780 |
2 |
zero_gravi |
|
781 |
|
|
char c = 0;
|
782 |
|
|
int length = 0;
|
783 |
|
|
|
784 |
|
|
while (1) {
|
785 |
50 |
zero_gravi |
c = neorv32_uart1_getc();
|
786 |
2 |
zero_gravi |
if (c == '\b') { // BACKSPACE
|
787 |
|
|
if (length != 0) {
|
788 |
|
|
if (echo) {
|
789 |
50 |
zero_gravi |
neorv32_uart1_print("\b \b"); // delete last char in console
|
790 |
2 |
zero_gravi |
}
|
791 |
|
|
buffer--;
|
792 |
|
|
length--;
|
793 |
|
|
}
|
794 |
|
|
}
|
795 |
|
|
else if (c == '\r') // carriage return
|
796 |
|
|
break;
|
797 |
|
|
else if ((c >= ' ') && (c <= '~') && (length < (max_size-1))) {
|
798 |
|
|
if (echo) {
|
799 |
50 |
zero_gravi |
neorv32_uart1_putc(c); // echo
|
800 |
2 |
zero_gravi |
}
|
801 |
|
|
*buffer++ = c;
|
802 |
|
|
length++;
|
803 |
|
|
}
|
804 |
|
|
}
|
805 |
|
|
*buffer = '\0'; // terminate string
|
806 |
|
|
|
807 |
|
|
return length;
|
808 |
|
|
}
|
809 |
|
|
|
810 |
50 |
zero_gravi |
|
811 |
|
|
|
812 |
|
|
// #################################################################################################
|
813 |
|
|
// Shared functions
|
814 |
|
|
// #################################################################################################
|
815 |
|
|
|
816 |
|
|
/**********************************************************************//**
|
817 |
|
|
* Private function for 'neorv32_printf' to convert into decimal.
|
818 |
|
|
*
|
819 |
|
|
* @param[in] x Unsigned input number.
|
820 |
|
|
* @param[in,out] res Pointer for storing the reuslting number string (11 chars).
|
821 |
|
|
**************************************************************************/
|
822 |
|
|
static void __neorv32_uart_itoa(uint32_t x, char *res) {
|
823 |
|
|
|
824 |
|
|
static const char numbers[] = "0123456789";
|
825 |
|
|
char buffer1[11];
|
826 |
|
|
uint16_t i, j;
|
827 |
|
|
|
828 |
|
|
buffer1[10] = '\0';
|
829 |
|
|
res[10] = '\0';
|
830 |
|
|
|
831 |
|
|
// convert
|
832 |
|
|
for (i=0; i<10; i++) {
|
833 |
|
|
buffer1[i] = numbers[x%10];
|
834 |
|
|
x /= 10;
|
835 |
|
|
}
|
836 |
|
|
|
837 |
|
|
// delete 'leading' zeros
|
838 |
|
|
for (i=9; i!=0; i--) {
|
839 |
|
|
if (buffer1[i] == '0')
|
840 |
|
|
buffer1[i] = '\0';
|
841 |
|
|
else
|
842 |
|
|
break;
|
843 |
|
|
}
|
844 |
|
|
|
845 |
|
|
// reverse
|
846 |
|
|
j = 0;
|
847 |
|
|
do {
|
848 |
|
|
if (buffer1[i] != '\0')
|
849 |
|
|
res[j++] = buffer1[i];
|
850 |
|
|
} while (i--);
|
851 |
|
|
|
852 |
|
|
res[j] = '\0'; // terminate result string
|
853 |
|
|
}
|
854 |
|
|
|
855 |
|
|
|
856 |
|
|
/**********************************************************************//**
|
857 |
|
|
* Private function for 'neorv32_printf' to convert into hexadecimal.
|
858 |
|
|
*
|
859 |
|
|
* @param[in] x Unsigned input number.
|
860 |
55 |
zero_gravi |
* @param[in,out] res Pointer for storing the resulting number string (9 chars).
|
861 |
50 |
zero_gravi |
**************************************************************************/
|
862 |
|
|
static void __neorv32_uart_tohex(uint32_t x, char *res) {
|
863 |
|
|
|
864 |
|
|
static const char symbols[] = "0123456789abcdef";
|
865 |
|
|
|
866 |
|
|
int i;
|
867 |
55 |
zero_gravi |
for (i=0; i<8; i++) { // nibble by nibble
|
868 |
50 |
zero_gravi |
uint32_t num_tmp = x >> (4*i);
|
869 |
|
|
res[7-i] = (char)symbols[num_tmp & 0x0f];
|
870 |
|
|
}
|
871 |
|
|
|
872 |
|
|
res[8] = '\0'; // terminate result string
|
873 |
|
|
}
|
874 |
72 |
zero_gravi |
|
875 |
|
|
|
876 |
|
|
/**********************************************************************//**
|
877 |
|
|
* Private function to cast a string to UPPERCASE.
|
878 |
|
|
*
|
879 |
|
|
* @param[in] len Total length of input string.
|
880 |
|
|
* @param[in,out] ptr Pointer for input/output string.
|
881 |
|
|
**************************************************************************/
|
882 |
|
|
static void __neorv32_uart_touppercase(uint32_t len, char *ptr) {
|
883 |
|
|
|
884 |
|
|
char tmp;
|
885 |
|
|
|
886 |
|
|
while (len > 0) {
|
887 |
|
|
tmp = *ptr;
|
888 |
|
|
if ((tmp >= 'a') && (tmp <= 'z')) {
|
889 |
|
|
*ptr = tmp - 32;
|
890 |
|
|
}
|
891 |
|
|
ptr++;
|
892 |
|
|
len--;
|
893 |
|
|
}
|
894 |
|
|
}
|