mirror of
https://github.com/betaflight/betaflight.git
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88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/*
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* This file is part of Cleanflight.
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*
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* Cleanflight 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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* Cleanflight 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 Cleanflight. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <platform.h>
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#ifdef USE_SOFTSPI
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#include "build/build_config.h"
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#include "drivers/io.h"
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#include "io_impl.h"
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#include "drivers/bus_spi.h"
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#include "bus_spi_soft.h"
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void softSpiInit(const softSPIDevice_t *dev)
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{
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// SCK as output
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IOInit(IOGetByTag(dev->sckTag), OWNER_SPI_SCK, RESOURCE_INDEX(SOFT_SPIDEV_1) + 10);
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#if defined(STM32F10X)
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IOConfigGPIO(IOGetByTag(dev->sckTag), IO_CONFIG(GPIO_Mode_Out_PP, GPIO_Speed_50MHz));
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#elif defined(STM32F3) || defined(STM32F4)
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IOConfigGPIOAF(IOGetByTag(dev->sckTag), SPI_IO_AF_CFG, 0);
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#endif
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// MOSI as output
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IOInit(IOGetByTag(dev->mosiTag), OWNER_SPI_MOSI, RESOURCE_INDEX(SOFT_SPIDEV_1) + 10);
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#if defined(STM32F10X)
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IOConfigGPIO(IOGetByTag(dev->mosiTag), IO_CONFIG(GPIO_Mode_Out_PP, GPIO_Speed_50MHz));
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#elif defined(STM32F3) || defined(STM32F4)
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IOConfigGPIOAF(IOGetByTag(dev->mosiTag), SPI_IO_AF_CFG, 0);
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#endif
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// MISO as input
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IOInit(IOGetByTag(dev->misoTag), OWNER_SPI_MISO, RESOURCE_INDEX(SOFT_SPIDEV_1) + 10);
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#if defined(STM32F10X)
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IOConfigGPIO(IOGetByTag(dev->misoTag), IO_CONFIG(GPIO_Mode_IN_FLOATING, GPIO_Speed_50MHz));
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#elif defined(STM32F3) || defined(STM32F4)
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IOConfigGPIOAF(IOGetByTag(dev->misoTag), SPI_IO_AF_CFG, 0);
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#endif
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// NSS as output
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if (dev->nssTag != IOTAG_NONE) {
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IOInit(IOGetByTag(dev->nssTag), OWNER_SPI_CS, RESOURCE_INDEX(SOFT_SPIDEV_1) + 10);
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#if defined(STM32F10X)
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IOConfigGPIO(IOGetByTag(dev->nssTag), IO_CONFIG(GPIO_Mode_Out_PP, GPIO_Speed_50MHz));
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#elif defined(STM32F3) || defined(STM32F4)
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IOConfigGPIOAF(IOGetByTag(dev->nssTag), SPI_IO_AF_CFG, 0);
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#endif
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}
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}
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uint8_t softSpiTransferByte(const softSPIDevice_t *dev, uint8_t byte)
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{
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for(int ii = 0; ii < 8; ++ii) {
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if (byte & 0x80) {
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IOHi(IOGetByTag(dev->mosiTag));
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} else {
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IOLo(IOGetByTag(dev->mosiTag));
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}
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IOHi(IOGetByTag(dev->sckTag));
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byte <<= 1;
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if (IORead(IOGetByTag(dev->misoTag)) == 1) {
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byte |= 1;
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}
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IOLo(IOGetByTag(dev->sckTag));
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}
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return byte;
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}
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#endif
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