mirror of
https://github.com/iNavFlight/inav.git
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97 lines
2.9 KiB
C
97 lines
2.9 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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#include "build_config.h"
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#ifdef USE_SOFTSPI
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#include "gpio.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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#ifdef STM32F303xC
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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// SCK as output
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GPIO_InitStructure.GPIO_Pin = dev->sck_pin;
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GPIO_InitStructure(dev->sck_gpio, &GPIO_InitStructure);
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// MOSI as output
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GPIO_InitStructure.GPIO_Pin = dev->mosi_pin;
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GPIO_Init(dev->mosi_gpio, &GPIO_InitStructure);
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// MISO as input
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GPIO_InitStructure.GPIO_Pin = dev->miso_pin;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(dev->miso_gpio, &GPIO_InitStructure);
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#ifdef SOFTSPI_NSS_PIN
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// NSS as gpio not slave select
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GPIO_InitStructure.GPIO_Pin = dev->nss_pin;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure(dev->csn_gpio, &GPIO_InitStructure);
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#endif
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#endif
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#ifdef STM32F10X
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gpio_config_t gpio;
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gpio.speed = Speed_50MHz;
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gpio.mode = Mode_AF_PP;
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// SCK as output
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gpio.pin = dev->sck_pin;
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gpioInit(dev->sck_gpio, &gpio);
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// MOSI as output
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gpio.pin = dev->mosi_pin;
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gpioInit(dev->mosi_gpio, &gpio);
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// MISO as input
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gpio.pin = dev->miso_pin;
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gpio.mode = Mode_IN_FLOATING;
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gpioInit(dev->miso_gpio, &gpio);
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#ifdef SOFTSPI_NSS_PIN
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// NSS as output
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gpio.pin = dev->nss_pin;
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gpio.mode = Mode_Out_PP;
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gpioInit(dev->csn_gpio, &gpio);
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#endif
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#endif
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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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GPIO_SetBits(dev->mosi_gpio, dev->mosi_pin);
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} else {
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GPIO_ResetBits(dev->mosi_gpio, dev->mosi_pin);
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}
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GPIO_SetBits(dev->sck_gpio, dev->sck_pin);
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byte <<= 1;
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if (GPIO_ReadInputDataBit(dev->miso_gpio, dev->miso_pin) == 1) {
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byte |= 1;
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}
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GPIO_ResetBits(dev->sck_gpio, dev->sck_pin);
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}
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return byte;
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}
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#endif
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