sforkowany z mirror/RS41ng
88 wiersze
2.4 KiB
C
88 wiersze
2.4 KiB
C
#include <stm32f10x_rcc.h>
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#include <stm32f10x_gpio.h>
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#include <stm32f10x_spi.h>
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#include "spi.h"
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void spi_init()
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{
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GPIO_InitTypeDef gpio_init;
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// SPI2_SCK & SPI2_MOSI
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gpio_init.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
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gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &gpio_init);
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// SPI2_MISO
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gpio_init.GPIO_Pin = GPIO_Pin_14;
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gpio_init.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &gpio_init);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
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SPI_InitTypeDef spi_init;
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SPI_StructInit(&spi_init);
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spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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spi_init.SPI_Mode = SPI_Mode_Master;
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spi_init.SPI_DataSize = SPI_DataSize_16b;
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spi_init.SPI_CPOL = SPI_CPOL_Low;
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spi_init.SPI_CPHA = SPI_CPHA_1Edge;
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spi_init.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
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spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
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spi_init.SPI_CRCPolynomial = 7;
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SPI_Init(SPI2, &spi_init);
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SPI_SSOutputCmd(SPI2, ENABLE);
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SPI_Cmd(SPI2, ENABLE);
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SPI_Init(SPI2, &spi_init);
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}
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void spi_uninit()
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{
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SPI_I2S_DeInit(SPI2);
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SPI_Cmd(SPI2, DISABLE);
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SPI_SSOutputCmd(SPI2, DISABLE);
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
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GPIO_InitTypeDef gpio_init;
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gpio_init.GPIO_Pin = GPIO_Pin_14;
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gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &gpio_init);
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gpio_init.GPIO_Pin = GPIO_Pin_15;
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gpio_init.GPIO_Mode = GPIO_Mode_AF_PP; // was: GPIO_Mode_Out_PP; // GPIO_Mode_AF_PP
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &gpio_init);
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}
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inline void spi_send(uint16_t data)
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{
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// Wait for TX buffer
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
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SPI_I2S_SendData(SPI2, data);
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}
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inline uint8_t spi_receive()
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{
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// Wait for data in RX buffer
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
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return (uint8_t) SPI_I2S_ReceiveData(SPI2);
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}
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uint8_t spi_send_and_receive(GPIO_TypeDef *gpio_cs, uint16_t pin_cs, uint16_t data) {
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GPIO_ResetBits(gpio_cs, pin_cs);
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
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SPI_I2S_SendData(SPI2, data);
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while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
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GPIO_SetBits(gpio_cs, pin_cs);
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return (uint8_t) SPI_I2S_ReceiveData(SPI2);
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}
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