[问答]

STM32F411RE上的SPI不工作，时钟运行不正确如何处理？

问答对人有帮助，内容完整，我也想知道答案 0 我正在尝试使用 SPI 协议将我的 MPU6500 连接到我的 Nucleo f411re 板。 MPU6500 工作正常，因为我用 Arduino 对其进行了测试，它按预期工作。我将 SPI2 与引脚 PB15、PB14 和 PB13 一起使用。但出于某种原因，我无法让它在 STMF411 上工作。事实上，正如您在示波器上看到的那样，时钟甚至无法正常工作。黄色是时钟，蓝色是 MOSI。（黄色标度为 500mv，蓝色标度为 5v）也许我的配置有误？我希望有人可以帮助我并发现错误。提前致谢！ #include "main.h" #include #include //ioSpeedConfig #define LOW_SPEED 0x00 #define MEDIUM_SPEED 0x01 #define FAST_SPEED 0x02 #define HIGH_SPEED 0x03 //ioPinConfig #define INPUT_MODE 0x00 #define OUTPUT_MODE 0x01 #define ALTERNAtiVE_MODE 0x02 #define ANALOG_MODE 0x03 //ioOtypeConfig #define Push_Pull 0x00 #define Open_Drain 0x01 //ioPushPullConfig #define NO_PULL 0x00 #define PULL_UP 0x01 #define PULL_DOWN 0x02 #define SET_PIN 1 #define RESET_PIN 0 #define AF0 0000 //system #define AF1 0001 //(TIM1/TIM2) #define AF2 0010 //(TIM3..5) #define AF3 0011 //(TIM9..11) #define AF4 0100 //(I2C1..3) #define AF5 0101 //(SPI1..4) #define AF6 0110 //(SPI3..5) #define AF7 0111 //(USART1..2) #define AF8 1000 //(USART6) #define AF9 1001 //(I2C2..3) #define AF10 1010 //(OTG_FS) #define AF11 1011 //NOTHING? #define AF12 1100 //(SDIO) #define AF13 1101 //NOTHING? #define AF14 1110 //NOTHING? #define AF15 1111 //(EVENTOUT) UART_HandleTypeDef huart2; const uint8_t SPI_READ = 0x80; const uint8_t PWR_MGMNT_1 = 0x6B; const uint8_t PWR_RESET = 0x80; const uint8_t WHO_AM_I = 0x75; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART2_UART_Init(void); void ioPinConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue); void ioPinSetReset(GPIO_TypeDef portName, uint8_t pinNum, uint8_t pinState); void ioPinPullConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue); void ioPinAlternateFunConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue); void ioPinOTypeConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue); void ioPinSetReset(GPIO_TypeDef portName, uint8_t pinNum, uint8_t pinState); uint8_t readRegister(SPI_TypeDef spih, uint8_t subAddress); void writeRegister(SPI_TypeDef spih, uint8_t subAddress, uint8_t value); void ioPinConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue) { portName->MODER = (portName->MODER & (~(0b11<<((2pinNum))))) \| (configValue << (2 * pinNum)); } void ioPinSpeedConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue) { portName->OSPEEDR = (portName->OSPEEDR & (~(0b11<<((2pinNum))))) \| (configValue << (2 * pinNum)); } void ioPinPullConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue) { portName->PUPDR = (portName->PUPDR & (~(0b11<<((2pinNum))))) \| (configValue << (2* pinNum)); } void ioPinAlternateFunConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue) { if(pinNum < 8) portName->AFR[0] = (portName->AFR[0] & (~(0xF<<((4pinNum))))) \| (configValue << (4 * pinNum)); else portName->AFR[1] = (portName->AFR[1] & (~(0xF<<((4(pinNum-8)))))) \| (configValue << (4 (pinNum-8))); } void ioPinOTypeConfig(GPIO_TypeDef portName, uint8_t pinNum, uint8_t configValue) { portName->OTYPER = (portName->OTYPER & (~(0x01<} void ioPinSetReset(GPIO_TypeDef portName, uint8_t pinNum, uint8_t pinState) { if(pinState == SET_PIN) portName->BSRR = (1 << pinNum); else portName->BSRR = (1 << (pinNum + 16)); } uint8_t readRegister(SPI_TypeDef spih, uint8_t subAddress) { spih->DR = (subAddress \| SPI_READ); while(!(spih->SR & (SPI_SR_TXE))); spih->DR = 0x00; //Send Dummy Data while(!(spih->SR & (SPI_SR_TXE))); while(!(spih->SR & (SPI_SR_RXNE))); while(spih->SR & (SPI_SR_BSY)); return spih->DR; } void writeRegister(SPI_TypeDef spih, uint8_t subAddress, uint8_t value) { spih->DR = subAddress; while(!(spih->SR & (SPI_SR_TXE))); spih->DR = value; while(!(spih->SR & (SPI_SR_TXE))); } int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART2_UART_Init(); ioPinConfig(GPIOB, 15, ALTERNATIVE_MODE); //MOSI ioPinConfig(GPIOB, 14, ALTERNATIVE_MODE); //MISO ioPinConfig(GPIOB, 13, ALTERNATIVE_MODE); //SCK ioPinOTypeConfig(GPIOB, 15, Push_Pull); ioPinOTypeConfig(GPIOB, 14, Push_Pull); ioPinOTypeConfig(GPIOB, 13, Push_Pull); ioPinPullConfig(GPIOB, 15, PULL_UP); ioPinPullConfig(GPIOB, 14, PULL_UP); ioPinPullConfig(GPIOB, 13, PULL_UP); ioPinAlternateFunConfig(GPIOB, 15, AF5); ioPinAlternateFunConfig(GPIOB, 14, AF5); ioPinAlternateFunConfig(GPIOB, 13, AF5); ioPinSpeedConfig(GPIOB, 15, HIGH_SPEED); ioPinSpeedConfig(GPIOB, 14, HIGH_SPEED); ioPinSpeedConfig(GPIOB, 13, HIGH_SPEED); //ENABLE SPI2 Clock RCC->APB1ENR \|= RCC_APB1ENR_SPI2EN; SPI2->CR1 = 0x00; SPI2->CR1 \|= SPI_CR1_SSM \| SPI_CR1_SSI \| 0x05 << 3 \| SPI_CR1_MSTR \| SPI_CR1_CPOL \| SPI_CR1_CPHA; SPI2->CR2 = 0x00; //Enable SPE SPI2->CR1 \|= SPI_CR1_SPE; writeRegister(SPI2, PWR_MGMNT_1, PWR_RESET); writeRegister(SPI2, 0x1B, 0x18); char buffer[16]; while (1) { //read WhoAmI Register to check if the device is working uint8_t whoAmIData = readRegister(SPI2, WHO_AM_I); sprintf(buffer, "WhoAmI: %d ", whoAmIData); HAL_UART_Transmit(&huart2, buffer, strlen(buffer), HAL_MAX_DELAY); } } void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 16; RCC_OscInitStruct.PLL.PLLN = 336; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; RCC_OscInitStruct.PLL.PLLQ = 4; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK\|RCC_CLOCKTYPE_SYSCLK \|RCC_CLOCKTYPE_PCLK1\|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } static void MX_USART2_UART_Init(void) { huart2.Instance = USART2; huart2.Init.BaudRate = 115200; huart2.Init.WordLength = UART_WORDLENGTH_8B; huart2.Init.StopBits = UART_STOPBITS_1; huart2.Init.Parity = UART_PARITY_NONE; huart2.Init.Mode = UART_MODE_TX_RX; huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart2.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart2) != HAL_OK) { Error_Handler(); } } static void MX_GPIO_Init(void) { /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); } void Error_Handler(void) { } 0
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答案对人有帮助，有参考价值 0 每次有一个字节进入时，RXNE 都会被设置。对于 SPI，每次发送一个字节时都会发生这种情况。对于单字节传输，您应该：等待TXE 设置 SPIx->DR = x 等待RXNE 读取 SPIx->DR 以清除 RXNE 您不会在每次字节传输时都这样做。

2023-1-29 09:55:32 评论举报周振夜