STM32L SPI求助

只看该作者 · 2014-10-28 10:08

在做SPI的通讯项目，，，，最近老是出现这么个问题，程序老是卡在红色标记的地方：为什么会出现这种问题呢？？？？大侠们有木有遇到
unsigned char SPI_SendByte(uint8_t Value)
{
while (__HAL_SPI_GET_FLAG(&SPIHandle, SPI_FLAG_TXE) == RESET);  程序老是莫名其妙的卡在这个地方
SPI_SendData(&SPIHandle,Value);

// Wait to receive a byte
while (__HAL_SPI_GET_FLAG(&SPIHandle, SPI_FLAG_RXNE) == RESET);
return  SPI_ReceiveData(&SPIHandle);
}

SPI的配置如下
/*-----------------------------1. IO  配置------------------------------------*/
void SPI_GPIO_Config(void)
{
   GPIO_InitTypeDef  GPIO_InitStruct;

   //使能GPIOA的时钟；MOSI--PA12；MISO--PA11；SPI1SCK--PA5；SPI1NSS--PA4
   __GPIOA_CLK_ENABLE();
   //使能SPI的时钟
   __SPI1_CLK_ENABLE();

   // Configure SPI SCK
   GPIO_InitStruct.Pin = GPIO_PIN_5;       //SPI1_SCK
   GPIO_InitStruct.Mode    = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull    = GPIO_PULLUP;
   GPIO_InitStruct.Speed    = GPIO_SPEED_FAST;
   GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;  //SPI函数映射，即连接到SPI
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

   // Configure SPI MISO and MOSI
   GPIO_InitStruct.Pin = GPIO_PIN_12;//MOSI
   GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;//SPI函数映射，即连接到SPI1
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

   GPIO_InitStruct.Pin = GPIO_PIN_11;//MISO
   GPIO_InitStruct.Alternate = GPIO_AF0_SPI1;//SPI函数映射，即连接到SPI
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

   // Configure SPI NSS
   GPIO_InitStruct.Pin = GPIO_PIN_4;//SPI1_SCK
   GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
   GPIO_InitStruct.Pull  = GPIO_PULLUP;//上拉
   GPIO_InitStruct.Speed = GPIO_SPEED_FAST;//高速
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

/*-----------------------------2. 参数配置------------------------------------*/
void SPI_Init(void)
{
SPI_HandleTypeDef  SPIHandle;

SPI_GPIO_Config();

/* SPI Config */
SPIHandle.Instance = SPI1;

SPIHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_64;  //
SPIHandle.Init.Direction = SPI_DIRECTION_2LINES;          //SPI_Direction_mode
SPIHandle.Init.CLKPhase = SPI_PHASE_2EDGE;                //CPHA
SPIHandle.Init.CLKPolarity = SPI_POLARITY_LOW;             //CPOL时钟空闲状态极性，SET：空闲时为高电平
SPIHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED; //CRC校验失能
SPIHandle.Init.CRCPolynomial = 7;
SPIHandle.Init.DataSize = SPI_DATASIZE_8BIT;                //数据大小8个bit
SPIHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SPIHandle.Init.NSS = SPI_NSS_SOFT;                         //软件管理模式，可以将NSS配置成普通GPIO作为MAX35101的CE端片选信号
SPIHandle.Init.TIMode = SPI_TIMODE_DISABLED;                //
SPIHandle.Init.Mode = SPI_MODE_MASTER;                      //主机模式

HAL_SPI_Init(&SPIHandle);//初始化SPI
__HAL_SPI_ENABLE(&SPIHandle);//使能 SPI
SPI1_NSS_high();//片选信号拉高，低电平有效

}

时钟配置：
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;

  // Enable Power Control clock
  __PWR_CLK_ENABLE();

  // The voltage scaling allows optimizing the power consumption when the device is
  // clocked below the maximum system frequency, to update the voltage scaling value
  // regarding system frequency refer to product datasheet.
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  // Enable HSI Oscillator and activate PLL with HSI as source
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;//选择HSI作为时钟源
  RCC_OscInitStruct.HSEState = RCC_HSE_OFF;//外部时钟关
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;//内部高速时钟打开
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;//PLL时钟开
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;//HSI作为PLL的时钟输入
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;//PLLCLK 16 x 4 =64MHZ,PLL先倍频
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;//PLLCLK/2=32MHZ ，PLL分频
  RCC_OscInitStruct.HSICalibrationValue = 0x10;//RC校准参数，采取官方提供值

  HAL_RCC_OscConfig(&RCC_OscInitStruct);
  // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
//  clocks dividers
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;//PLL作为SYSCLK，即32MHZ
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;//不分频
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);//闪存1个延时周期

}