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https://github.com/mytechnotalent/Embedded-Hacking.git
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80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/**
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* @file spi.c
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* @brief Implementation of SPI bus driver (master mode)
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* @author Kevin Thomas
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* @date 2025
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*
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* MIT License
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*
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* Copyright (c) 2025 Kevin Thomas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "spi.h"
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#include "pico/stdlib.h"
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#include "hardware/spi.h"
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/**
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* @brief Map an SPI port number to its hardware instance pointer
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*
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* @param port SPI port number (0 for spi0, 1 for spi1)
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* @return spi_inst_t* Pointer to the corresponding SPI hardware instance
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*/
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static spi_inst_t *_get_spi_inst(uint8_t port) {
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return port == 0 ? spi0 : spi1;
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}
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/**
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* @brief Assign GPIO alternate functions for the SPI data and clock pins
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*
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* @param mosi GPIO pin for MOSI
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* @param miso GPIO pin for MISO
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* @param sck GPIO pin for SCK
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*/
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static void _setup_spi_pins(uint32_t mosi, uint32_t miso, uint32_t sck) {
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gpio_set_function(mosi, GPIO_FUNC_SPI);
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gpio_set_function(miso, GPIO_FUNC_SPI);
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gpio_set_function(sck, GPIO_FUNC_SPI);
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}
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void spi_driver_init(uint8_t port, uint32_t mosi, uint32_t miso,
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uint32_t sck, uint32_t cs, uint32_t baud_hz) {
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spi_inst_t *spi = _get_spi_inst(port);
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spi_init(spi, baud_hz);
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_setup_spi_pins(mosi, miso, sck);
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gpio_init(cs);
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gpio_set_dir(cs, GPIO_OUT);
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gpio_put(cs, 1);
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}
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void spi_driver_cs_select(uint32_t cs) {
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gpio_put(cs, 0);
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}
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void spi_driver_cs_deselect(uint32_t cs) {
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gpio_put(cs, 1);
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}
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void spi_driver_transfer(uint8_t port, const uint8_t *tx, uint8_t *rx,
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uint32_t len) {
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spi_inst_t *spi = _get_spi_inst(port);
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spi_write_read_blocking(spi, tx, rx, (size_t)len);
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}
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