mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-08 15:24:00 +02:00
Kevin Thomas
066c69f24b
Public function docstrings belong exclusively in .h headers per coding convention. Only static helper functions and static variables retain docstrings in .c files. Removed 413 duplicate docstrings across 185 files (15 CBM + 15 C SDK projects). All 30 projects rebuild with zero errors.
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/**
|
|
* @file spi.c
|
|
* @brief Implementation of SPI bus driver (master mode)
|
|
* @author Kevin Thomas
|
|
* @date 2025
|
|
*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2025 Kevin Thomas
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include "spi.h"
|
|
#include "pico/stdlib.h"
|
|
#include "hardware/spi.h"
|
|
|
|
/**
|
|
* @brief Map an SPI port number to its hardware instance pointer
|
|
*
|
|
* @param port SPI port number (0 for spi0, 1 for spi1)
|
|
* @return spi_inst_t* Pointer to the corresponding SPI hardware instance
|
|
*/
|
|
static spi_inst_t *_get_spi_inst(uint8_t port) {
|
|
return port == 0 ? spi0 : spi1;
|
|
}
|
|
|
|
/**
|
|
* @brief Assign GPIO alternate functions for the SPI data and clock pins
|
|
*
|
|
* @param mosi GPIO pin for MOSI
|
|
* @param miso GPIO pin for MISO
|
|
* @param sck GPIO pin for SCK
|
|
*/
|
|
static void _setup_spi_pins(uint32_t mosi, uint32_t miso, uint32_t sck) {
|
|
gpio_set_function(mosi, GPIO_FUNC_SPI);
|
|
gpio_set_function(miso, GPIO_FUNC_SPI);
|
|
gpio_set_function(sck, GPIO_FUNC_SPI);
|
|
}
|
|
|
|
void spi_driver_init(uint8_t port, uint32_t mosi, uint32_t miso,
|
|
uint32_t sck, uint32_t cs, uint32_t baud_hz) {
|
|
spi_inst_t *spi = _get_spi_inst(port);
|
|
spi_init(spi, baud_hz);
|
|
_setup_spi_pins(mosi, miso, sck);
|
|
gpio_init(cs);
|
|
gpio_set_dir(cs, GPIO_OUT);
|
|
gpio_put(cs, 1);
|
|
}
|
|
|
|
void spi_driver_cs_select(uint32_t cs) {
|
|
gpio_put(cs, 0);
|
|
}
|
|
|
|
void spi_driver_cs_deselect(uint32_t cs) {
|
|
gpio_put(cs, 1);
|
|
}
|
|
|
|
void spi_driver_transfer(uint8_t port, const uint8_t *tx, uint8_t *rx,
|
|
uint32_t len) {
|
|
spi_inst_t *spi = _get_spi_inst(port);
|
|
spi_write_read_blocking(spi, tx, rx, (size_t)len);
|
|
}
|