使用硬件SPI读取触摸屏死机

PCA · 发表于 2016-3-11 08:51:33

本帖最后由 PCA 于 2016-3-11 08:54 编辑

触摸程序还是使用原子的程序，把原来的模拟SPI改成了硬件SPI修改了下面这个读取函数

u16 ADS_Read_AD(u8 CMD)
{
      u16 Num=0;

      SPIx_SetSpeed(SPI_BaudRatePrescaler_256);
      TCS=0;
      delay_us(3);
      SPIx_ReadWriteByte(CMD);
      delay_us(6);
      Num=SPIx_ReadWriteByte(0);
      Num<<=8;
      Num=Num|SPIx_ReadWriteByte(0);
      Num>>=4;
      TCS=1;
      SPIx_SetSpeed(2);
      return(Num);
}

SPI程序段如下：
#include "spi.h"

SPI_InitTypeDef  SPI_InitStructure;

void SPIx_Init(void)
{

      GPIO_InitTypeDef GPIO_InitStructure;
      SPI_InitTypeDef  SPI_InitStructure;

      RCC_APB2PeriphClockCmd(       RCC_APB2Periph_GPIOA|RCC_APB2Periph_SPI1, ENABLE );

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //¸′óÃíÆíìêä3ö
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);

      SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //éèÖÃSPIμ￥Ïò»òÕßË«ÏòμÄêy¾YÄ￡ê½:SPIéèÖÃÎaË«ÏßË«Ïòè«Ë«1¤
      SPI_InitStructure.SPI_Mode = SPI_Mode_Master;             //éèÖÃSPI1¤×÷Ä￡ê½:éèÖÃÎaÖ÷SPI
      SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;             //éèÖÃSPIμÄêy¾Y′óD¡:SPI·￠Ëí½óêÕ8Î»Ö¡½á11
      SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;             //Ñ¡ÔñáË′®DDê±ÖóμÄÎèì¬:ê±ÖóDü¿Õ¸ß
      SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;       //êy¾Y2¶»ñóúμú¶t¸öê±ÖóÑØ
      SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;             //NSSDÅoÅóéó2¼t￡¨NSS1ü½Å￡©»1êÇèí¼t￡¨ê1óÃSSIÎ»￡©1üàí:Äú2¿NSSDÅoÅóDSSIÎ»¿ØÖÆ
      SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;             //¶¨òå2¨ìØÂêÔ¤·ÖÆμμÄÖμ:2¨ìØÂêÔ¤·ÖÆμÖμÎa256
      SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;       //Ö¸¶¨êy¾Y′«êä′óMSBÎ»»1êÇLSBÎ»¿aê¼:êy¾Y′«êä′óMSBÎ»¿aê¼
      SPI_InitStructure.SPI_CRCPolynomial = 7;       //CRCÖμ¼ÆËãμÄ¶àÏîê½
      SPI_Init(SPI1, &SPI_InitStructure);  //¸ù¾YSPI_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèSPIx¼Ä′æÆ÷

      SPI_Cmd(SPI1, ENABLE); //ê1ÄüSPIíaéè

      SPIx_ReadWriteByte(0xff);//Æô¶ˉ′«êä
}

void SPIx_SetSpeed(u8 SpeedSet)
{
      SPI_InitStructure.SPI_BaudRatePrescaler = SpeedSet ;
      SPI_Init(SPI1, &SPI_InitStructure);
      SPI_Cmd(SPI1,ENABLE);
}

//SPIx ¶áD′ò»¸ö×Ö½ú
//TxData:òaD′èëμÄ×Ö½ú
//·μ»ØÖμ:¶áè¡μ½μÄ×Ö½ú
u8 SPIx_ReadWriteByte(u8 TxData)
{
      u8 retry=0;

      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //¼ì2éÖ¸¶¨μÄSPI±êÖ¾Î»éèÖÃóë·ñ:·￠Ëí»o′æ¿Õ±êÖ¾Î»
            {
            retry++;
            if(retry>200)return 0;
            }

      SPI_I2S_SendData(SPI1, TxData); //í¨1yíaéèSPIx·￠Ëíò»¸öêy¾Y
      retry=0;

      while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); //¼ì2éÖ¸¶¨μÄSPI±êÖ¾Î»éèÖÃóë·ñ:½óêü»o′æ·Ç¿Õ±êÖ¾Î»
            {
            retry++;
            if(retry>200)return 0;
            }

      return SPI_I2S_ReceiveData(SPI1); //·μ»Øí¨1ySPIx×î½ü½óêÕμÄêy¾Y
}

只要一读取触摸屏是数据程序就停在那里不走了
      while(1)
      {

                     Read_ADS2(&Pen_Point.X,&Pen_Point.Y);

                     LCD_ShowNum(40+24,40,Pen_Point.X,4,16);             //ÏÔê¾êyÖμ
                     LCD_ShowNum(40+24+80,40,Pen_Point.Y,4,16);       //ÏÔê¾êyÖμ
                     showhanzi32(168,232,3);
                     delay_ms(500);
                     LCD_Clear(WHITE);

      }

哪位大侠帮帮在下

正点原子 · 发表于 2016-3-11 23:04:02

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使用硬件SPI读取触摸屏死机

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