/* Copyright 2020 * * 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 <stdbool.h> #include "gpio.h" typedef int16_t spi_status_t; // Hardware SS pin is defined in the header so that user code can refer to it #if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) # define SPI_SS_PIN B0 #elif defined(__AVR_ATmega32A__) # define SPI_SS_PIN B4 #elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__) # define SPI_SS_PIN B2 #endif #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 void spi_init(void); bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor); 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