202 lines
5.0 KiB
C
202 lines
5.0 KiB
C
#include "stm32_spi.h"
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__IO uint32_t TIMEOUT=LONG_TIMEOUT;
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/***********************************************
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调用方式： SPI_Inital()
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SDO ---> PA5
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CS ---> PB6
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SCLK ---> PA5
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SDI ---> PA7
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DRDY ---> PB6
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返回值：
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函数说明：MAX31865 硬件spi初始化
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************************************************/
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void SPI_Inital(void)
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{
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SPI_InitTypeDef SPI_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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// GPIO
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RCC_APB2PeriphClockCmd(SPI_GPIO_CLK, ENABLE);
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RCC_APB2PeriphClockCmd(SPI_CS_GPIO_CLK, ENABLE);
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/*!< SPI Periph clock enable */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
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/*!< GPIO configuration */
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/*!< Configure SPI pins */
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GPIO_InitStructure.GPIO_Pin = SPI_SCK|SPI_MOSI|SPI_MISO;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(MAX31865_SPI_PORT, &GPIO_InitStructure);
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/*!< Configure SPI pin: CS */
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GPIO_InitStructure.GPIO_Pin = SPI_CS;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(MAX31865_IO_PORT, &GPIO_InitStructure);
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//set CS high
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GPIO_SetBits(MAX31865_IO_PORT, SPI_CS);
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/*!< SPI configuration */
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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SPI_InitStructure.SPI_DataSize =SPI_DataSize_8b;
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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/* SPI Peripheral Enable */
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SPI_Cmd(SPI1, ENABLE);
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/* Apply SPI configuration after enabling it */
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SPI_Init(SPI1, &SPI_InitStructure);
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}
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/***********************************************
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调用方式： SPI_Write()
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返回值：
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函数说明：SPI写数据
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************************************************/
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uint8_t SPI_Write(uint8_t *buffer, uint8_t nBytes)
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{
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uint8_t i;
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for(i=0;i<nBytes;i++){
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){ //not empty
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if((TIMEOUT--) == 0) return (1);
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}
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SPI_I2S_SendData(SPI1,buffer[i]);
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){
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if((TIMEOUT--) == 0) return (1);
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}
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SPI_I2S_ReceiveData(SPI1);
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}
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return(0);
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}
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/***********************************************
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调用方式： SPI_Read()
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返回值：
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函数说明：SPI读数据
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************************************************/
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uint8_t SPI_Read(uint8_t *buffer, uint8_t nBytes)
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{
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uint8_t i;
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SPI_I2S_ReceiveData(SPI1);
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for(i=0;i<nBytes;i++)
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{
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){ //not empty
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if((TIMEOUT--) == 0) return (1);
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}
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SPI_I2S_SendData(SPI1,0x00);
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){
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if((TIMEOUT--) == 0) return (1);
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}
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buffer[i]= SPI_I2S_ReceiveData(SPI1);
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}
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return(0);
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}
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/***********************************************
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调用方式： SPI_WriteByte()
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返回值：
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函数说明：SPI字节写数据
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************************************************/
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uint8_t SPI_WriteByte(uint8_t data)
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{
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET){ //not empty
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if((TIMEOUT--) == 0) return (1);
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}
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SPI_I2S_SendData(SPI1,data);
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TIMEOUT = LONG_TIMEOUT;
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET){
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if((TIMEOUT--) == 0) return (1);
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}
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SPI_I2S_ReceiveData(SPI1);
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SPI_I2S_ReceiveData(SPI1);
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return(0);
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}
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/***********************************************
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调用方式： SPI_WriteByte()
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返回值：
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函数说明：SPI字节读数据
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************************************************/
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uint8_t SPI_ReadByte(void)
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{
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SPI_I2S_ReceiveData(SPI1);
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); //not empty
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SPI_I2S_SendData(SPI1,0xff);
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while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
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return (SPI_I2S_ReceiveData(SPI1));
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}
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/***********************************************
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调用方式： Set_DRDY_Pin_INPUT()
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返回值：
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函数说明：MAX31865 DRDY输入IO配置
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************************************************/
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void Set_DRDY_Pin_INPUT(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(DRDY_GPIO_CLK, ENABLE);
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GPIO_InitStructure.GPIO_Pin = DRDY_PIN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(MAX31865_IO_PORT, &GPIO_InitStructure);
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}
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/***********************************************
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调用方式： DRDY_Pin_Value()
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返回值：
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函数说明： 读MAX31865 DRDY_Pin_Value高低电平
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************************************************/
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uint8_t DRDY_Pin_Value(void)
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{
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return(GPIO_ReadOutputDataBit(MAX31865_IO_PORT, DRDY_PIN));
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}
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