ads7843.c

SDIO文件系统forHMI-STM32

#include "ADS7843.h"
#include "stm32f10x_lib.h"


unsigned char SPI_WriteByte(unsigned char data)
{
 unsigned char Data = 0;

   //Wait until the transmit buffer is empty
  while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_TXE)==RESET);
  // Send the byte
  SPI_I2S_SendData(SPI1,data);

   //Wait until a data is received
  while(SPI_I2S_GetFlagStatus(SPI1,SPI_I2S_FLAG_RXNE)==RESET);
  // Get the received data
  Data = SPI_I2S_ReceiveData(SPI1);

  // Return the shifted data
  return Data;
}


void SpiDelay(unsigned int DelayCnt)
{
 unsigned int i;
 for(i=0;i<DelayCnt;i++);
}

int TPReadX(void)
{
   int x=0;
   TP_CS();
   SpiDelay(10);
   SPI_WriteByte(0x90);
   SpiDelay(10);
   //WaitTPReady();
   x=SPI_WriteByte(0x00);
   x<<=8;
   x+=SPI_WriteByte(0x00);
   //SpiDelay(10);
   TP_DCS();
   return x>>4;
}

int TPReadY(void)
{
 int y=0;
  TP_CS();
  SpiDelay(10);
  SPI_WriteByte(0xD0);
  SpiDelay(10);
  //WaitTPReady();
  y=SPI_WriteByte(0x00);
  y<<=8;
  y+=SPI_WriteByte(0x00);
  //SpiDelay(10);
  TP_DCS();
  return y>>4;
}