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// #################################################################################################
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// # < neo430_spi.c - Internal SPI module driver functions > #
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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 NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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#include "neo430.h"
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#include "neo430_spi.h"
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/* ------------------------------------------------------------
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* INFO Reset, configure speed and enable SPI module
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* INFO SPI SCK speed: f_main/(2*PRSC), prsc = see below (control reg)
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* SPI clock prescaler select:
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* 0: CLK/2
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* 1: CLK/4
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* 2: CLK/8
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* 3: CLK/64
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* 4: CLK/128
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* 5: CLK/1024
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* 6: CLK/2048
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* 7: CLK/4096
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* ------------------------------------------------------------ */
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void neo430_spi_enable(uint8_t prsc) {
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SPI_CT = 0; // reset
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SPI_CT = (1 << SPI_CT_EN) | (prsc<<SPI_CT_PRSC0);
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}
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/* ------------------------------------------------------------
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* INFO Enable SPI module
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* ------------------------------------------------------------ */
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void neo430_spi_disable(void) {
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SPI_CT = 0;
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}
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/* ------------------------------------------------------------
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* INFO Enable SPI CSx (set low)
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* PARAM CS line (0..5)
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* ------------------------------------------------------------ */
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void neo430_spi_cs_en(uint8_t cs) {
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SPI_CT |= 1 << (cs+SPI_CT_CS_SEL0);
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}
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/* ------------------------------------------------------------
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* INFO Disable ALL SPI CS lines (set high)
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* ------------------------------------------------------------ */
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void neo430_spi_cs_dis(void) {
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SPI_CT &= ~(0b111111 << SPI_CT_CS_SEL0); // clear all 6 CS lines
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}
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/* ------------------------------------------------------------
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* INFO SPI RTX byte transfer
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* PARAM d byte to be send
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* RETURN received byte
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* ------------------------------------------------------------ */
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uint16_t neo430_spi_trans(uint16_t d) {
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SPI_RTX = d; // trigger transfer
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while((SPI_CT & (1<<SPI_CT_BUSY)) != 0); // wait for current transfer to finish
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return SPI_RTX;
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}
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