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Diffstat (limited to 'platforms/avr/drivers/spi_master.h')
-rw-r--r--platforms/avr/drivers/spi_master.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/platforms/avr/drivers/spi_master.h b/platforms/avr/drivers/spi_master.h
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+++ b/platforms/avr/drivers/spi_master.h
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1/* Copyright 2020
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 3 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <https://www.gnu.org/licenses/>.
15 */
16
17#pragma once
18
19#include <stdbool.h>
20
21#include "gpio.h"
22
23typedef int16_t spi_status_t;
24
25// Hardware SS pin is defined in the header so that user code can refer to it
26#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__)
27# define SPI_SS_PIN B0
28#elif defined(__AVR_ATmega32A__)
29# define SPI_SS_PIN B4
30#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
31# define SPI_SS_PIN B2
32#endif
33
34#define SPI_STATUS_SUCCESS (0)
35#define SPI_STATUS_ERROR (-1)
36#define SPI_STATUS_TIMEOUT (-2)
37
38#define SPI_TIMEOUT_IMMEDIATE (0)
39#define SPI_TIMEOUT_INFINITE (0xFFFF)
40
41#ifdef __cplusplus
42extern "C" {
43#endif
44void spi_init(void);
45
46bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
47
48spi_status_t spi_write(uint8_t data);
49
50spi_status_t spi_read(void);
51
52spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
53
54spi_status_t spi_receive(uint8_t *data, uint16_t length);
55
56void spi_stop(void);
57#ifdef __cplusplus
58}
59#endif