AD5671A的SPI通信（用的STM32F4）

brother1231d · 发表于 2022-1-6 17:12:34

如何发出连续的24位？
void ad5761r_write(uint8_t reg_addr_cmd,uint16_t reg_data)
{
      uint8_t data[3];
      data[0] = reg_addr_cmd;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);//μè′y·￠ËíÇø¿Õ
      SPI_I2S_SendData(SPI1, data[0]); //·￠ËíμçÑ1Öμ
      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);

      data[1] = (reg_data & 0xFF00) >> 8;
      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);//μè′y·￠ËíÇø¿Õ
      SPI_I2S_SendData(SPI1, data[1]); //·￠ËíμçÑ1Öμ
      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);

      data[2] = (reg_data & 0x00FF) >> 0;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);//μè′y·￠ËíÇø¿Õ
      SPI_I2S_SendData(SPI1, data[2]); //·￠ËíμçÑ1Öμ
      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
}

void AD5541A_control(u16 date1)
{
      AD5541A_LDAC=0; //LDAC½óDAC￡¬¼Ä′æÆ÷êμê±êäèë¸üDÂ
      AD5541A_SYNC=1; //syncà-¸ß
      delay_us(1);
      AD5541A_SYNC=0; //syncà-μí
      delay_us(1);
      ad5761r_write(CMD_WR_CTRL_REG,date1);
      delay_us(1);
      AD5541A_SYNC=1; //syncà-¸ß
      }
//·￠ËíμçÑ1
void AD5541A_WRITE(u16 voltage)
{
      AD5541A_LDAC=0; //LDAC½óDAC￡¬¼Ä′æÆ÷êμê±êäèë¸üDÂ
      AD5541A_SYNC=1; //syncà-¸ß
      delay_us(1);
      AD5541A_SYNC=0; //syncà-μí
      delay_us(1);
      ad5761r_write(CMD_WR_UPDATE_DAC_REG,voltage);
      delay_us(1); //2»¼óò2¿éòÔ°é
      AD5541A_SYNC=1; //syncà-¸ß
      }

自己用GPIO写的周期太大了
void AD5541Awrite(unsigned char count, unsigned char *data)
{
      unsigned char ValueToWrite = 0;
unsigned char i = 0;
      unsigned char j = 0;
      SCLK_H;
      for(i=1;i<(count+1);i++)
      {
               ValueToWrite = *(data + i - 1);
            for(j=0; j<8; j++)
            {
                     if(0x80 == (ValueToWrite & 0x80))
                     {
                              MOSI_H;       //êä3ö¸ßμçÆ½
                     }
                     else
                     {
                              MOSI_L;       //êä3öμíμçÆ½
                     }
                     delay_us(1);
                     SCLK_L;
                     delay_us(1);
                     ValueToWrite <<= 1;       //Rotate data
                     SCLK_H;
            }
      }
      MOSI_H;
}

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芯片时序图