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// #################################################################################################
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// # << NEORV32: neorv32_rte.c - NEORV32 Runtime Environment >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, 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_rte.c
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* @author Stephan Nolting
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* @brief NEORV32 Runtime Environment.
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_rte.h"
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// Privates
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zero_gravi |
static void __neorv32_rte_dummy_exc_handler(void) __attribute__((unused));
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static void __neorv32_rte_debug_exc_handler(void) __attribute__((unused));
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static void __neorv32_rte_print_true_false(int state) __attribute__((unused));
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static void __neorv32_rte_print_hw_version(void) __attribute__((unused));
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zero_gravi |
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/**********************************************************************//**
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* Setup NEORV32 runtime environment in debug mode.
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*
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* @note This function installs a debug handler for ALL exception and interrupt sources, which
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* gives detailed information about the exception/interrupt. Call this function before you
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* install custom handler functions via neorv32_rte_exception_install(uint8_t exc_id, void (*handler)(void)),
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* since this function will override all installed exception handlers.
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*
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* @warning This function should be used for debugging only, since it only shows the uninitialize exception/interrupt, but
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* does not resolve the cause. Hence, it cannot guarantee to resume normal application execution after showing the debug messages.
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**************************************************************************/
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void neorv32_rte_enable_debug_mode(void) {
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uint8_t id;
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// install debug handler for all sources
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for (id=0; id<32; id++) {
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neorv32_rte_exception_install(id, __neorv32_rte_debug_exc_handler);
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}
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}
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/**********************************************************************//**
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* Install exception handler function to NEORV32 runtime environment.
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*
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* @note This function automatically activates the according CSR.mie bits when installing handlers for
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* the MTIME (MTI), CLIC (MEI) or machine software interrupt (MSI). The global interrupt enable bit mstatus.mie has
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* to be set by the user via neorv32_cpu_eint(void).
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*
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* @param[in] exc_id Identifier (type) of the targeted exception. See #NEORV32_EXCEPTION_IDS_enum.
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* @param[in] handler The actual handler function for the specified exception (function must be of type "void function(void);").
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* return 0 if success, 1 if error (invalid exc_id or targeted exception not supported).
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**************************************************************************/
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int neorv32_rte_exception_install(uint8_t exc_id, void (*handler)(void)) {
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// id valid?
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if ((exc_id == EXCID_I_MISALIGNED) || (exc_id == EXCID_I_ACCESS) || (exc_id == EXCID_I_ILLEGAL) ||
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(exc_id == EXCID_BREAKPOINT) || (exc_id == EXCID_L_MISALIGNED) || (exc_id == EXCID_L_ACCESS) ||
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(exc_id == EXCID_S_MISALIGNED) || (exc_id == EXCID_S_ACCESS) || (exc_id == EXCID_MENV_CALL) ||
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(exc_id == EXCID_MSI) || (exc_id == EXCID_MTI) || (exc_id == EXCID_MEI)) {
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if (exc_id == EXCID_MSI) { neorv32_cpu_irq_enable(CPU_MIE_MSIE); } // activate software interrupt
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if (exc_id == EXCID_MTI) { neorv32_cpu_irq_enable(CPU_MIE_MTIE); } // activate timer interrupt
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if (exc_id == EXCID_MEI) { neorv32_cpu_irq_enable(CPU_MIE_MEIE); } // activate external interrupt
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uint32_t vt_base = neorv32_cpu_csr_read(CSR_MDSPACEBASE); // base address of vector table
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vt_base = vt_base + (((uint32_t)exc_id) << 2);
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(*(IO_REG32 (vt_base))) = (uint32_t)handler;
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return 0;
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}
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return 1;
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}
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/**********************************************************************//**
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* Uninstall exception handler function from NEORV32 runtime environment, which was
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* previously installed via neorv32_rte_exception_install(uint8_t exc_id, void (*handler)(void)).
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*
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* @note This function automatically clears the according CSR.mie bits when uninstalling handlers for
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* the MTIME (MTI), CLIC (MEI) or machine software interrupt (MSI). The global interrupt enable bit mstatus.mie has
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* to be cleared by the user via neorv32_cpu_dint(void).
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*
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* @param[in] exc_id Identifier (type) of the targeted exception. See #NEORV32_EXCEPTION_IDS_enum.
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* return 0 if success, 1 if error (invalid exc_id or targeted exception not supported).
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**************************************************************************/
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int neorv32_rte_exception_uninstall(uint8_t exc_id) {
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// id valid?
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if ((exc_id == EXCID_I_MISALIGNED) || (exc_id == EXCID_I_ACCESS) || (exc_id == EXCID_I_ILLEGAL) ||
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(exc_id == EXCID_BREAKPOINT) || (exc_id == EXCID_L_MISALIGNED) || (exc_id == EXCID_L_ACCESS) ||
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(exc_id == EXCID_S_MISALIGNED) || (exc_id == EXCID_S_ACCESS) || (exc_id == EXCID_MENV_CALL) ||
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(exc_id == EXCID_MSI) || (exc_id == EXCID_MTI) || (exc_id == EXCID_MEI)) {
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if (exc_id == EXCID_MSI) { neorv32_cpu_irq_disable(CPU_MIE_MSIE); } // deactivate software interrupt
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if (exc_id == EXCID_MTI) { neorv32_cpu_irq_disable(CPU_MIE_MTIE); } // deactivate timer interrupt
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if (exc_id == EXCID_MEI) { neorv32_cpu_irq_disable(CPU_MIE_MEIE); } // deactivate external interrupt
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uint32_t vt_base = neorv32_cpu_csr_read(CSR_MDSPACEBASE); // base address of vector table
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vt_base = vt_base + (((uint32_t)exc_id) << 2);
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(*(IO_REG32 (vt_base))) = (uint32_t)(&__neorv32_rte_dummy_exc_handler); // use dummy handler in case the exception is triggered
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return 0;
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}
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return 1;
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}
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/**********************************************************************//**
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* NEORV32 runtime environment: Dummy exception handler (does nothing).
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* @note This function is used by neorv32_rte_exception_uninstall(uint8_t exc_id) only.
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**************************************************************************/
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static void __neorv32_rte_dummy_exc_handler(void) {
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asm volatile("nop");
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}
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/**********************************************************************//**
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* NEORV32 runtime environment: Debug exception handler, printing various exception/interrupt information via UART.
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* @note This function is used by neorv32_rte_enable_debug_mode(void) only.
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**************************************************************************/
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static void __neorv32_rte_debug_exc_handler(void) {
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neorv32_uart_printf("\n\n<< NEORV32 Runtime Environment >>\n");
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neorv32_uart_printf("System time: 0x%x_%x\n", neorv32_cpu_csr_read(CSR_TIMEH), neorv32_cpu_csr_read(CSR_TIME));
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register uint32_t exc_cause = neorv32_cpu_csr_read(CSR_MCAUSE);
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register uint32_t return_addr = neorv32_cpu_csr_read(CSR_MEPC);
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register uint32_t trans_cmd = neorv32_cpu_csr_read(CSR_MTINST);
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if (exc_cause & 0x80000000) {
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neorv32_uart_printf("INTERRUPT");
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}
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else {
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neorv32_uart_printf("EXCEPTION");
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if ((trans_cmd & (1 << 1)) == 0) {
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return_addr -= 4;
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}
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else {
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return_addr -= 2;
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}
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zero_gravi |
}
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neorv32_uart_printf(" at instruction address: 0x%x\n", return_addr);
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neorv32_uart_printf("Cause: ");
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switch (exc_cause) {
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case 0x00000000: neorv32_uart_printf("Instruction address misaligned"); break;
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case 0x00000001: neorv32_uart_printf("Instruction access fault"); break;
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case 0x00000002: neorv32_uart_printf("Illegal instruction"); break;
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case 0x00000003: neorv32_uart_printf("Breakpoint (EBREAK)"); break;
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case 0x00000004: neorv32_uart_printf("Load address misaligned"); break;
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case 0x00000005: neorv32_uart_printf("Load access fault"); break;
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case 0x00000006: neorv32_uart_printf("Store address misaligned"); break;
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case 0x00000007: neorv32_uart_printf("Store access fault"); break;
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case 0x0000000B: neorv32_uart_printf("Environment call (ECALL)"); break;
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case 0x80000003: neorv32_uart_printf("Machine software interrupt"); break;
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case 0x80000007: neorv32_uart_printf("Machine timer interrupt (via MTIME)"); break;
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case 0x8000000B: neorv32_uart_printf("Machine external interrupt (via CLIC)"); break;
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default: neorv32_uart_printf("Unknown (0x%x)", exc_cause); break;
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}
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// fault address
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if (exc_cause == 0x00000002) {
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neorv32_uart_printf("\nFaulting instruction");
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}
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else {
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neorv32_uart_printf("\nFaulting address");
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}
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neorv32_uart_printf(": 0x%x\n", neorv32_cpu_csr_read(CSR_MTVAL));
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neorv32_uart_printf("Transf. instruction: 0x%x ", trans_cmd);
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zero_gravi |
if ((trans_cmd & (1 << 1)) == 0) {
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neorv32_uart_printf("(decompressed)\n");
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zero_gravi |
}
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zero_gravi |
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neorv32_uart_printf("Trying to resume application @ 0x%x...", neorv32_cpu_csr_read(CSR_MEPC));
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neorv32_uart_printf("\n<</NEORV32 Runtime Environment >>\n\n");
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}
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/**********************************************************************//**
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* NEORV32 runtime environment: Print hardware configuration information via UART
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**************************************************************************/
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void neorv32_rte_print_hw_config(void) {
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uint32_t tmp;
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int i;
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char c;
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neorv32_uart_printf("\n\n<< NEORV32 Hardware Configuration Overview >>\n");
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// CPU configuration
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neorv32_uart_printf("\n-- Central Processing Unit --\n");
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// Hart ID
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neorv32_uart_printf("Hart ID: 0x%x\n", neorv32_cpu_csr_read(CSR_MHARTID));
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// HW version
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neorv32_uart_printf("Hardware version: ");
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__neorv32_rte_print_hw_version();
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neorv32_uart_printf(" (0x%x)\n", neorv32_cpu_csr_read(CSR_MIMPID));
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// CPU architecture
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neorv32_uart_printf("Architecture: ");
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tmp = neorv32_cpu_csr_read(CSR_MISA);
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tmp = (tmp >> 30) & 0x03;
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if (tmp == 0) {
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neorv32_uart_printf("unknown");
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}
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if (tmp == 1) {
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neorv32_uart_printf("RV32");
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}
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if (tmp == 2) {
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neorv32_uart_printf("RV64");
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}
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if (tmp == 3) {
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neorv32_uart_printf("RV128");
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}
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// CPU extensions
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neorv32_uart_printf("\nCPU extensions: ");
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tmp = neorv32_cpu_csr_read(CSR_MISA);
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for (i=0; i<26; i++) {
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if (tmp & (1 << i)) {
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c = (char)('A' + i);
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neorv32_uart_putc(c);
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neorv32_uart_putc(' ');
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}
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}
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264 |
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neorv32_uart_printf("(0x%x)\n", tmp);
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265 |
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// Performance counters
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267 |
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neorv32_uart_printf("CNT & time CSRs: ");
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268 |
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__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_CSR_COUNTERS));
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// Clock speed
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271 |
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neorv32_uart_printf("Clock speed: %u Hz\n", neorv32_cpu_csr_read(CSR_MCLOCK));
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// Memory configuration
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274 |
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neorv32_uart_printf("\n-- Memory Configuration --\n");
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275 |
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uint32_t size = neorv32_cpu_csr_read(CSR_MISPACESIZE);
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277 |
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uint32_t base = neorv32_cpu_csr_read(CSR_MISPACEBASE);
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neorv32_uart_printf("Instruction memory: %u bytes @ 0x%x\n", size, base);
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neorv32_uart_printf("Internal IMEM: ");
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280 |
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__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_MEM_INT_IMEM));
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281 |
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neorv32_uart_printf("Internal IMEM as ROM: ");
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282 |
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__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_MEM_INT_IMEM_ROM));
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283 |
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size = neorv32_cpu_csr_read(CSR_MDSPACESIZE);
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base = neorv32_cpu_csr_read(CSR_MDSPACEBASE);
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neorv32_uart_printf("Data memory: %u bytes @ 0x%x\n", size, base);
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287 |
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neorv32_uart_printf("Internal DMEM: ");
|
288 |
|
|
__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_MEM_INT_DMEM));
|
289 |
|
|
|
290 |
|
|
neorv32_uart_printf("Bootloader: ");
|
291 |
|
|
__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_BOOTLOADER));
|
292 |
|
|
|
293 |
|
|
neorv32_uart_printf("External interface: ");
|
294 |
|
|
__neorv32_rte_print_true_false(neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_MEM_EXT));
|
295 |
|
|
|
296 |
|
|
// peripherals
|
297 |
|
|
neorv32_uart_printf("\n-- Peripherals --\n");
|
298 |
|
|
tmp = neorv32_cpu_csr_read(CSR_MFEATURES);
|
299 |
|
|
|
300 |
|
|
neorv32_uart_printf("GPIO: ");
|
301 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_GPIO));
|
302 |
|
|
|
303 |
|
|
neorv32_uart_printf("MTIME: ");
|
304 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_MTIME));
|
305 |
|
|
|
306 |
|
|
neorv32_uart_printf("UART: ");
|
307 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_UART));
|
308 |
|
|
|
309 |
|
|
neorv32_uart_printf("SPI: ");
|
310 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_SPI));
|
311 |
|
|
|
312 |
|
|
neorv32_uart_printf("TWI: ");
|
313 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_TWI));
|
314 |
|
|
|
315 |
|
|
neorv32_uart_printf("PWM: ");
|
316 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_PWM));
|
317 |
|
|
|
318 |
|
|
neorv32_uart_printf("WDT: ");
|
319 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_WDT));
|
320 |
|
|
|
321 |
|
|
neorv32_uart_printf("CLIC: ");
|
322 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_CLIC));
|
323 |
|
|
|
324 |
|
|
neorv32_uart_printf("TRNG: ");
|
325 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_TRNG));
|
326 |
|
|
|
327 |
|
|
neorv32_uart_printf("DEVNULL: ");
|
328 |
|
|
__neorv32_rte_print_true_false(tmp & (1 << CPU_MFEATURES_IO_DEVNULL));
|
329 |
|
|
}
|
330 |
|
|
|
331 |
|
|
|
332 |
|
|
/**********************************************************************//**
|
333 |
|
|
* NEORV32 runtime environment: Private function to print true or false.
|
334 |
|
|
* @note This function is used by neorv32_rte_print_hw_config(void) only.
|
335 |
|
|
*
|
336 |
|
|
* @param[in] state Print TRUE when !=0, print FALSE when 0
|
337 |
|
|
**************************************************************************/
|
338 |
|
|
static void __neorv32_rte_print_true_false(int state) {
|
339 |
|
|
|
340 |
|
|
if (state) {
|
341 |
|
|
neorv32_uart_printf("True\n");
|
342 |
|
|
}
|
343 |
2 |
zero_gravi |
else {
|
344 |
6 |
zero_gravi |
neorv32_uart_printf("False\n");
|
345 |
2 |
zero_gravi |
}
|
346 |
6 |
zero_gravi |
}
|
347 |
2 |
zero_gravi |
|
348 |
|
|
|
349 |
6 |
zero_gravi |
/**********************************************************************//**
|
350 |
|
|
* NEORV32 runtime environment: Private function to show the processor version in human-readable format.
|
351 |
|
|
* @note This function is used by neorv32_rte_print_hw_config(void) only.
|
352 |
|
|
**************************************************************************/
|
353 |
|
|
static void __neorv32_rte_print_hw_version(void) {
|
354 |
|
|
|
355 |
|
|
uint32_t i;
|
356 |
|
|
char tmp, cnt;
|
357 |
|
|
uint32_t version = neorv32_cpu_csr_read(CSR_MIMPID);
|
358 |
|
|
|
359 |
|
|
for (i=0; i<4; i++) {
|
360 |
|
|
|
361 |
|
|
tmp = (char)(version >> (24 - 8*i));
|
362 |
|
|
|
363 |
|
|
// serial division
|
364 |
|
|
cnt = 0;
|
365 |
|
|
while (tmp >= 10) {
|
366 |
|
|
tmp = tmp - 10;
|
367 |
|
|
cnt++;
|
368 |
|
|
}
|
369 |
|
|
|
370 |
|
|
if (cnt) {
|
371 |
|
|
neorv32_uart_putc('0' + cnt);
|
372 |
|
|
}
|
373 |
|
|
neorv32_uart_putc('0' + tmp);
|
374 |
|
|
if (i < 3) {
|
375 |
|
|
neorv32_uart_putc('.');
|
376 |
|
|
}
|
377 |
|
|
}
|
378 |
2 |
zero_gravi |
}
|