From 7777c0454712128670f98a5c7f62da01f7c0aa58 Mon Sep 17 00:00:00 2001 From: Ryan Date: Wed, 8 Apr 2020 11:04:31 +1000 Subject: spi_master for AVR (#8299) * Change _delay_ms/us() to wait_ms/us() * Switch to platform-agnostic GPIO macros * Add AVR spi_master and migrate Adafruit BLE code * Set verbose back to false * Add clock divisor, bit order and SPI mode configuration for init * Add start and stop functions * Move configuration of mode, endianness and speed to `spi_start()` * Some breaks here would be good * Default Adafruit BLE clock divisor to 4 (2MHz on the Feather 32U4) * Remove mode and divisor enums * Add some docs * No hr at EOF * Add links in sidebar --- drivers/avr/spi_master.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 drivers/avr/spi_master.h (limited to 'drivers/avr/spi_master.h') 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 . + */ + +#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 -- cgit v1.2.3