diff options
Diffstat (limited to 'drivers/avr/spi_master.h')
| -rw-r--r-- | drivers/avr/spi_master.h | 57 | 
1 files changed, 57 insertions, 0 deletions
| diff --git a/drivers/avr/spi_master.h b/drivers/avr/spi_master.h new file mode 100644 index 0000000000..0bab2dc24e --- /dev/null +++ b/drivers/avr/spi_master.h @@ -0,0 +1,57 @@ +/*  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 "quantum.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_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__) +#    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); + +void spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint8_t divisor); + +spi_status_t spi_write(uint8_t data, uint16_t timeout); + +spi_status_t spi_read(uint16_t timeout); + +spi_status_t spi_transmit(const uint8_t *data, uint16_t length, uint16_t timeout); + +spi_status_t spi_receive(uint8_t *data, uint16_t length, uint16_t timeout); + +void spi_stop(void); +#ifdef __cplusplus +} +#endif | 
