关于SPI 时钟问题 以及应用 请各位帮忙

宋星光1

void SPI_FLASH_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable SPI1 and GPIO clocks */
  /*!< SPI_FLASH_SPI_CS_GPIO, SPI_FLASH_SPI_MOSI_GPIO,
       SPI_FLASH_SPI_MISO_GPIO, SPI_FLASH_SPI_DETECT_GPIO
       and SPI_FLASH_SPI_SCK_GPIO Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOD, ENABLE);

  /*!< SPI_FLASH_SPI Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);


  /*!< Configure SPI_FLASH_SPI pins: SCK */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MISO */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI pins: MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /*!< Configure SPI_FLASH_SPI_CS_PIN pin: SPI_FLASH Card CS pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* SPI1 configuration */
  // W25X16: data input on the DIO pin is sampled on the rising edge of the CLK.
  // Data on the DO and DIO pins are clocked out on the falling edge of CLK.
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

  /* Enable SPI1  */
  SPI_Cmd(SPI1, ENABLE);
}


u8 SPI_FLASH_SendByte(u8 byte)
{
  /* Loop while DR register in not emplty */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

  /* Send byte through the SPI1 peripheral */
  SPI_I2S_SendData(SPI1, byte);

  /* Wait to receive a byte */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return the byte read from the SPI bus */
  return SPI_I2S_ReceiveData(SPI1);
}



我用SPI接口  接了一个12864    引脚完全对应   没接MISO 引脚（因为12864没有）
是不是 我把这个程序全都拷贝过去    调用SPI_FLASH_SendByte(u8 byte) 这个函数
12864的时钟就跟着震荡起来了呢   

        SPI_FLASH_SendByte(0xfa);  我这样调用 是不是 这个数据0xfa  就发送出去了呢


我这个函数这样写
/*********************************************************************
*函  数：SPI_write_data
*功  能：向LCD写入数据
*参  数：无
*返回值：无
**********************************************************************/
void SPI_write_data(uint8_t Dispdata)
{
        LCD_Busy();
        SPI_FLASH_CS_HIGH();       //12864 高电平有效
        SPI_FLASH_SendByte(0xfa);
        Delay_ms(2);
        SPI_FLASH_SendByte(Dispdata & 0xf0);
        Delay_ms(2);
        SPI_FLASH_SendByte((Dispdata << 4) & 0xf0);
        Delay_ms(2);
        SPI_FLASH_CS_LOW();
}

华欣悦

检查下CPOL CPHA的模式与1602的是否匹配

宋星光1

华欣悦 发表于 2016-10-26 16:47
检查下CPOL CPHA的模式与1602的是否匹配

好的  谢谢