AFE4490读数始终为0

只看该作者 · 2015-9-24 19:36

最近在开发AFE4490，读出写过的寄存器，发现读数一直为0；有用过的小伙伴知道为什么吗？、
uint32_t AFE4490_SPIReadReg(uint8_t addr)
{

  AFE4490_SPIWriteReg(CONTROL0,0x00000001);       // CONTROL0最低位写1，SPI read is enabled  ！！必须在STE enable之前
  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_12,GPIO_PIN_RESET);  // STE enable
  AFE4490_SendByte(addr);                                        // Send lower register address
  PPG_temp[2]=AFE4490_SendByte(0xff);
  PPG_temp[1]=AFE4490_SendByte(0xff);
  PPG_temp[0]=AFE4490_SendByte(0xff);

  HAL_GPIO_WritePin(GPIOB,GPIO_PIN_12,GPIO_PIN_SET);// STE disable
  AFE4490_SPIWriteReg(CONTROL0,0x00000000);       // CONTROL0最低位写0，SPI read is disabled
return (PPG_temp[2]*65536+PPG_temp[1]*256+PPG_temp[0]);
}