STM32F4Discovery:通过SPI读取串行闪存制造/设备ID

Question

我需要一些帮助来排除故障。我正在尝试从W25Q128FV串行闪存读取制造商和设备ID，使用的是Arduino Due上的SPI。

闪存的数据表是这样写的：

“通过将/CS引脚驱动为低电平，并将指令代码"90h”移位，然后是000000h的24位地址(A23-A0)，即可启动该指令。之后，Winbond (EFh)的制造商ID和器件ID将在时钟的下降沿移出，最高有效位(MSB)最先，如图39所示。“

​

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我的代码是:我得到的响应总是255,255或者0，0 main：

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_SPI1_Init();

    manualId = deviceId = 0;

    read_id = 0x90;
    zero1   = 0x00;
    zero2   = 0x00;
    zero3   = 0x00;

    //Enable SPI
    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_RESET);

    //Send code
    masterToSlave = HAL_SPI_Transmit(&hspi1, &read_id, 1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero1,   1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero2,   1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero3,   1, 1000);

    //Recieve ID
    slaveToMaster = HAL_SPI_Receive(&hspi1, &manualId, 1, 1000);
    slaveToMaster = HAL_SPI_Receive(&hspi1, &deviceId, 1, 1000);    

    //Disable SPI
    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
}

完整代码：

#include "main.h"
#include "stm32f4xx_hal.h"

//FLASH                                         CHIP
//--------------------------------
//  1-----------|------------PC 5
//  2-----------|------------PA 6 
//  3-----------|------------
//  4-----------|------------GND
//  5-----------|------------PA 7
//  6-----------|------------PA 5
//  7-----------|------------
//  8-----------|------------VCC
SPI_HandleTypeDef hspi1;

void SystemClock_Config(void);
void Error_Handler(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);

#define spi_enable      HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_RESET)
#define spi_disable   HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET)

HAL_StatusTypeDef masterToSlave, slaveToMaster;

uint8_t receive_data=0;
uint8_t read_id, zero1, zero2, zero3;
uint8_t manualId, deviceId;

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_SPI1_Init();

    manualId = deviceId = 0;

    read_id = 0x90;
    zero1   = 0x00;
    zero2   = 0x00;
    zero3   = 0x00;

    //Enable SPI
    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_RESET);

    //Send code
    masterToSlave = HAL_SPI_Transmit(&hspi1, &read_id, 1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero1,   1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero2,   1, 1000);
    masterToSlave = HAL_SPI_Transmit(&hspi1, &zero3,   1, 1000);

    //Recieve ID
    slaveToMaster = HAL_SPI_Receive(&hspi1, &manualId, 1, 1000);
    slaveToMaster = HAL_SPI_Receive(&hspi1, &deviceId, 1, 1000);    

    //Disable SPI
    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);
}


void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Configure the main internal regulator output voltage 
    */
  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

    /**Initializes the CPU, AHB and APB busses 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_DIV8;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV4;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
  {
    Error_Handler();
  }

    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}


static void MX_SPI1_Init(void)
{
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;//SPI_POLARITY_HIGH;//
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
}

static void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOC_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_5, GPIO_PIN_SET);

  /*Configure GPIO pin : PC5 */
  GPIO_InitStruct.Pin = GPIO_PIN_5;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

}



void Error_Handler(void)
{

  while(1) 
  {
  }
}

#ifdef USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)
{
}

#endif

Answer 1

这里，您还没有启动SPI时钟。如果不启动SPI时钟，SPI将无法初始化，因此无法进行通信。