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spi_master for AVR (#8299)

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* 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
This commit is contained in:
Ryan 2020-04-08 11:04:31 +10:00 • committed by GitHub
parent e409fb47f2
commit 400ca2d035
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14 changed files with 397 additions and 125 deletions
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drivers/avr/spi_master.h Normal file
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/* 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