大家好，
我尝试通过 SPI 使用我的
STM32L4A6ZG 传输数据。我配置了 Transmitt Only Master
模式并通过硬件选择 NSS。
初始化后我检查函数：
ret_tx1 = HAL_SPI_GetState(&hspi1);
返回：HAL_SPI_STATE_READY，
但是当我尝试传输数据时，我在示波器上既看不到时钟也看不到数据，而且
SPI 返回值是 HAL_SPI_STATE_RESET。
我不知道怎么了。我会很感激一些帮助。
这是我的代码
- /* USER CODE BEGIN Header */
- /**
- ******************************************************************************
- * @file : main.c
- * @brief : Main program body
- ******************************************************************************
- * @attention
- *
- *
© Copyright (c) 2020 STMicroelectronics.- * All rights reserved.
- *
- * This software component is licensed by ST under BSD 3-Clause license,
- * the "License"; You may not use this file except in compliance with the
- * License. You may obtain a copy of the License at:
- * opensource.org/licenses/BSD-3-Clause
- *
- ******************************************************************************
- */
- /* USER CODE END Header */
- /* Includes ------------------------------------------------------------------*/
- #include "main.h"
- /* Private includes ----------------------------------------------------------*/
- /* USER CODE BEGIN Includes */
- /* USER CODE END Includes */
- /* Private typedef -----------------------------------------------------------*/
- /* USER CODE BEGIN PTD */
- /* USER CODE END PTD */
- /* Private define ------------------------------------------------------------*/
- /* USER CODE BEGIN PD */
- /* USER CODE END PD */
- /* Private macro -------------------------------------------------------------*/
- /* USER CODE BEGIN PM */
- /* USER CODE END PM */
- /* Private variables ---------------------------------------------------------*/
- SPI_HandleTypeDef hspi1;
- /* USER CODE BEGIN PV */
- HAL_SPI_StateTypeDef ret_tx1 = HAL_SPI_STATE_ERROR;
- /* USER CODE END PV */
- /* Private function prototypes -----------------------------------------------*/
- void SystemClock_Config(void);
- static void MX_GPIO_Init(void);
- static void MX_SPI1_Init(void);
- /* USER CODE BEGIN PFP */
- /* USER CODE END PFP */
- /* Private user code ---------------------------------------------------------*/
- /* USER CODE BEGIN 0 */
- /* USER CODE END 0 */
- /**
- * @brief The application entry point.
- * @retval int
- */
- int main(void)
- {
- /* USER CODE BEGIN 1 */
- /* USER CODE END 1 */
- /* MCU Configuration--------------------------------------------------------*/
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
- HAL_Init();
- /* USER CODE BEGIN Init */
- /* USER CODE END Init */
- /* Configure the system clock */
- SystemClock_Config();
- /* USER CODE BEGIN SysInit */
- /* USER CODE END SysInit */
- /* Initialize all configured peripherals */
- MX_GPIO_Init();
- MX_SPI1_Init();
- /* USER CODE BEGIN 2 */
- ret_tx1 = HAL_SPI_GetState(&hspi1);
- if(ret_tx1 == HAL_SPI_STATE_READY){
- uint8_t tx[8] = {0,1,2,3,4,5,6,7};
- // HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, RESET);
- ret_tx1 = HAL_SPI_Transmit(&hspi1, (uint8_t *) tx, 8, 250);
- if(ret_tx1 == HAL_SPI_STATE_READY){
- HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14, SET);
- }
- else{
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7, SET);
- }
- }
- /* USER CODE END 2 */
- /* Infinite loop */
- /* USER CODE BEGIN WHILE */
- while (1)
- {
- /* USER CODE END WHILE */
- /* USER CODE BEGIN 3 */
- }
- /* USER CODE END 3 */
- }
- /**
- * @brief System Clock Configuration
- * @retval None
- */
- void SystemClock_Config(void)
- {
- RCC_OscInitTypeDef RCC_OscInitStruct = {0};
- RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
- /** Initializes the RCC Oscillators according to the specified parameters
- * in the RCC_OscInitTypeDef structure.
- */
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
- RCC_OscInitStruct.MSIState = RCC_MSI_ON;
- RCC_OscInitStruct.MSICalibrationValue = 0;
- RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
- RCC_OscInitStruct.PLL.PLLM = 1;
- RCC_OscInitStruct.PLL.PLLN = 40;
- RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
- RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
- RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
- {
- Error_Handler();
- }
- /** Initializes the CPU, AHB and APB buses clocks
- */
- 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_DIV1;
- RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
- {
- Error_Handler();
- }
- /** Configure the main internal regulator output voltage
- */
- if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
- {
- Error_Handler();
- }
- }
- /**
- * @brief SPI1 Initialization Function
- * @param None
- * @retval None
- */
- static void MX_SPI1_Init(void)
- {
- /* USER CODE BEGIN SPI1_Init 0 */
- /* USER CODE END SPI1_Init 0 */
- /* USER CODE BEGIN SPI1_Init 1 */
- /* USER CODE END SPI1_Init 1 */
- /* SPI1 parameter configuration*/
- hspi1.Instance = SPI1;
- hspi1.Init.Mode = SPI_MODE_MASTER;
- hspi1.Init.Direction = SPI_DIRECTION_2LINES;
- hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
- hspi1.Init.NSS = SPI_NSS_HARD_OUTPUT;
- hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
- hspi1.Init.TIMode = SPI_TIMODE_ENABLE;
- hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
- hspi1.Init.CRCPolynomial = 7;
- hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
- hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
- if (HAL_SPI_Init(&hspi1) != HAL_OK)
- {
- Error_Handler();
- }
- /* USER CODE BEGIN SPI1_Init 2 */
- /* USER CODE END SPI1_Init 2 */
- }
- /**
- * @brief GPIO Initialization Function
- * @param None
- * @retval None
- */
- static void MX_GPIO_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStruct = {0};
- /* GPIO Ports Clock Enable */
- __HAL_RCC_GPIOA_CLK_ENABLE();
- __HAL_RCC_GPIOB_CLK_ENABLE();
- __HAL_RCC_GPIOC_CLK_ENABLE();
- /*Configure GPIO pin Output Level */
- HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14, GPIO_PIN_RESET);
- /*Configure GPIO pin Output Level */
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7, GPIO_PIN_RESET);
- /*Configure GPIO pin : PB14 */
- GPIO_InitStruct.Pin = GPIO_PIN_14;
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_InitStruct.Pull = GPIO_NOPULL;
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
- HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
- /*Configure GPIO pin : PC7 */
- GPIO_InitStruct.Pin = GPIO_PIN_7;
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
- GPIO_InitStruct.Pull = GPIO_NOPULL;
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
- HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
- }
- /* USER CODE BEGIN 4 */
- /* USER CODE END 4 */
- /**
- * @brief This function is executed in case of error occurrence.
- * @retval None
- */
- void Error_Handler(void)
- {
- /* USER CODE BEGIN Error_Handler_Debug */
- /* User can add his own implementation to report the HAL error return state */
- /* USER CODE END Error_Handler_Debug */
- }
- #ifdef USE_FULL_ASSERT
- /**
- * @brief Reports the name of the source file and the source line number
- * where the assert_param error has occurred.
- * @param file: pointer to the source file name
- * @param line: assert_param error line source number
- * @retval None
- */
- void assert_failed(uint8_t *file, uint32_t line)
- {
- /* USER CODE BEGIN 6 */
- /* User can add his own implementation to report the file name and line number,
- tex: printf("Wrong parameters value: file %s on line %drn", file, line) */
- /* USER CODE END 6 */
- }
- #endif /* USE_FULL_ASSERT */
- /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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