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6d61381d2a
The expandable GPIO API requires the comparison of structured GPIO types. This means that inline functions must be used instead of direct comparisons. For the migration process, drivers must first be changed so that they use the inline comparison functions.
74 lines
1.7 KiB
C
74 lines
1.7 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 SPI_NUMOF
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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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#endif /* SPI_NUMOF */
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