F407探索者硬件SPI读取3.5寸电阻屏触摸坐标失败,始终为(x:4095,y:4095)

jackwei86 · 发表于 2021-3-30 16:20:23

板子是探索者F407ZGT6 使用keil5运行hal库例子touch可以正常运行触摸屏实验,切换到CubeIDE环境运行touch例子也不正常,网上找了SPI 读取的例子,始终没法成功.

问题:每次读取ADC中的 X Y 返回值一直是4095
#define TOUCH_CS_HIGH() HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13,GPIO_PIN_SET)
#define TOUCH_CS_LOW() HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13,GPIO_PIN_RESET)
uint8_t WR_Cmd(uint8_t cmd)
{
      uint8_t Tx_DATA = cmd;
      uint8_t Rx_DATA = 0;
      HAL_StatusTypeDef ndef = HAL_SPI_TransmitReceive(&hspi1,&Tx_DATA,&Rx_DATA,1,500);
      return Rx_DATA;
}
//读取X轴或y轴的ADC值
uint16_t TP_Read_AD(uint8_t cmd)
{
      uint8_t i, j;
      uint16_t NUMH,NUML;
      uint16_t NUM;
      TOUCH_CS_LOW();       /* 打开片选 */
      WR_Cmd(cmd);
      NUMH = WR_Cmd(0xff);
      NUML = WR_Cmd(0xff);
      NUM = (NUMH<<8)+ NUML;
      NUM >>= 4;             //高12位有效
      //printf("NUM[%d] = %d\r\n",i,NUM);
      //TCS=1;
      TOUCH_CS_HIGH();       /*关闭片选 */

  return NUM;
}==============================
TP_Read_AD() 返回值一直都是4095
=================================

SPI 配置:
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_HIGH;
  hspi1.Init.CLKPhase = SPI_PHASE_2EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 10;