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70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
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* 2016 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup drivers_periph_spi
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* @{
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*
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* @file
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* @brief common SPI function fallback implementations
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <stddef.h>
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#include "board.h"
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#include "cpu.h"
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#include "periph/spi.h"
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#ifdef PERIPH_SPI_NEEDS_INIT_CS
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int spi_init_cs(spi_t bus, spi_cs_t cs)
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{
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if (bus >= SPI_NUMOF) {
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return SPI_NODEV;
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}
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if (gpio_is_equal(cs, SPI_CS_UNDEF) || !gpio_is_valid(cs)) {
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return SPI_NOCS;
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}
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gpio_init((gpio_t)cs, GPIO_OUT);
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gpio_set((gpio_t)cs);
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return SPI_OK;
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}
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#endif
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#ifdef PERIPH_SPI_NEEDS_TRANSFER_BYTE
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uint8_t spi_transfer_byte(spi_t bus, spi_cs_t cs, bool cont, uint8_t out)
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{
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uint8_t in;
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spi_transfer_bytes(bus, cs, cont, &out, &in, 1);
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return in;
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}
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#endif
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#ifdef PERIPH_SPI_NEEDS_TRANSFER_REG
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uint8_t spi_transfer_reg(spi_t bus, spi_cs_t cs, uint8_t reg, uint8_t out)
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{
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spi_transfer_bytes(bus, cs, true, ®, NULL, 1);
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return spi_transfer_byte(bus, cs, false, out);
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}
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#endif
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#ifdef PERIPH_SPI_NEEDS_TRANSFER_REGS
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void spi_transfer_regs(spi_t bus, spi_cs_t cs,
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uint8_t reg, const void *out, void *in, size_t len)
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{
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spi_transfer_bytes(bus, cs, true, ®, NULL, 1);
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spi_transfer_bytes(bus, cs, false, out, in, len);
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}
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#endif
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