qmk_firmware/platforms/chibios/drivers/spi_master.h

/* Copyright 2020 Nick Brassel (tzarc)
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#pragma once

#include <ch.h>
#include <hal.h>
#include <stdbool.h>

#include "gpio.h"
#include "chibios_config.h"

#ifndef SPI_DRIVER
#    define SPI_DRIVER SPID2
#endif

#ifndef SPI_SCK_PIN
#    define SPI_SCK_PIN B13
#endif

#ifndef SPI_SCK_PAL_MODE
#    if defined(USE_GPIOV1)
#        define SPI_SCK_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
#    else
#        define SPI_SCK_PAL_MODE 5
#    endif
#endif

#ifndef SPI_MOSI_PIN
#    define SPI_MOSI_PIN B15
#endif

#ifndef SPI_MOSI_PAL_MODE
#    if defined(USE_GPIOV1)
#        define SPI_MOSI_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
#    else
#        define SPI_MOSI_PAL_MODE 5
#    endif
#endif

#ifndef SPI_MISO_PIN
#    define SPI_MISO_PIN B14
#endif

#ifndef SPI_MISO_PAL_MODE
#    if defined(USE_GPIOV1)
#        define SPI_MISO_PAL_MODE PAL_MODE_ALTERNATE_PUSHPULL
#    else
#        define SPI_MISO_PAL_MODE 5
#    endif
#endif

typedef int16_t spi_status_t;

#define SPI_STATUS_SUCCESS (0)
#define SPI_STATUS_ERROR (-1)
#define SPI_STATUS_TIMEOUT (-2)

#define SPI_TIMEOUT_IMMEDIATE (0)
#define SPI_TIMEOUT_INFINITE (0xFFFF)

#ifdef __cplusplus
extern "C" {
#endif
typedef struct spi_start_config_t {
    pin_t    slave_pin;
    bool     lsb_first;
    uint8_t  mode;
    uint16_t divisor;
    bool     cs_active_low;
} spi_start_config_t;

void spi_init(void);

bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
bool spi_start_extended(spi_start_config_t *start_config);

spi_status_t spi_write(uint8_t data);

spi_status_t spi_read(void);

spi_status_t spi_transmit(const uint8_t *data, uint16_t length);

spi_status_t spi_receive(uint8_t *data, uint16_t length);

void spi_stop(void);
#ifdef __cplusplus
}
#endif