60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/spi.h>
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#include <libopencm3/stm32/rcc.h>
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void spi_send8(uint32_t spi, uint8_t data)
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{
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/* Wait for transfer finished. */
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while (!(SPI_SR(spi) & SPI_SR_TXE));
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/* Write data (8 or 16 bits, depending on DFF) into DR. */
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SPI_DR8(spi) = data;
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}
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uint8_t spi_read8(uint32_t spi)
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{
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/* Wait for transfer finished. */
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while (!(SPI_SR(spi) & SPI_SR_RXNE));
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/* Read the data (8 or 16 bits, depending on DFF bit) from DR. */
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return SPI_DR8(spi);
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}
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void spi_set_data_size(uint32_t spi, uint16_t data_s)
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{
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SPI_CR2(spi) = (SPI_CR2(spi) & ~SPI_CR2_DS_MASK) |
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(data_s & SPI_CR2_DS_MASK);
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}
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void spi_fifo_reception_threshold_8bit(uint32_t spi)
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{
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SPI_CR2(spi) |= SPI_CR2_FRXTH;
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}
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void spi_fifo_reception_threshold_16bit(uint32_t spi)
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{
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SPI_CR2(spi) &= ~SPI_CR2_FRXTH;
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}
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void spi_i2s_mode_spi_mode(uint32_t spi)
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{
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SPI_I2SCFGR(spi) &= ~SPI_I2SCFGR_I2SMOD;
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} |