60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Copyright 2020
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stdbool.h>
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#include "gpio.h"
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typedef int16_t spi_status_t;
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// Hardware SS pin is defined in the header so that user code can refer to it
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#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__)
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# define SPI_SS_PIN B0
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#elif defined(__AVR_ATmega32A__)
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# define SPI_SS_PIN B4
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#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
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# define SPI_SS_PIN B2
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#endif
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#define SPI_STATUS_SUCCESS (0)
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#define SPI_STATUS_ERROR (-1)
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#define SPI_STATUS_TIMEOUT (-2)
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#define SPI_TIMEOUT_IMMEDIATE (0)
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#define SPI_TIMEOUT_INFINITE (0xFFFF)
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#ifdef __cplusplus
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extern "C" {
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#endif
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void spi_init(void);
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bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
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spi_status_t spi_write(uint8_t data);
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spi_status_t spi_read(void);
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spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
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spi_status_t spi_receive(uint8_t *data, uint16_t length);
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void spi_stop(void);
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#ifdef __cplusplus
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}
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#endif
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