【ARM】ADC·FS2410数模转换

开发环境

       1、硬件平台：FS2410

       2、主机：Ubuntu 12.04

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ADC寄存器配置

      1、初始化ADC（ADCCON）

       设置预分频，预分频因子，选择A/D转换通道，并选择正常模式且启动转换

      2、判断转换是否结束(ADCCON[5])

      3、读取转换结果（ADCDATn）

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串口的初始化

       见《串口通信·FS2410》：http://infohacker.blog.51cto.com/6751239/1223137

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源代码

      //adc.c

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#include "2410addr.h"      //头文件，包含寄存器的设置                                         void  putc ( char  ch)       //发送字符 {      while (!(rUTRSTAT0 & 0X2));     //判断发送缓冲区是否为空                                                   rUTXH0 = ch;         //发送 }                                         char  getc ( void )        //接收字符 {      while (!(rUTRSTAT0 & 0X1));      //判断接收缓冲区是否为空                                                  return  rURXH0;       //接收 }                                         void  putstr( char  *str)       //发送字符串 {      while (*str !=  '\0' )      {          if (*str ==  '\n' )          {              putc ( '\n' );              putc ( '\r' );          }          else              putc (*str);                                                          str++;      } }                                         void  wait( long  long  max)       //延迟函数 {      for (; max > 0; max--)          ; }                                         void  itoa(unsigned  long  value)     //进行字符转换 {      unsigned  long  temp;      int  i, flag = 0;      char  data[4];                                                  for (i = 0; i < 4; i++)     //清空数组          data[i] =  '\0' ;                                              for (i = 0; i < 3; i++)      {          temp = (value >> 4 * i) & 0xf;                                                          if (temp < 10)              data[2 - i] =  '0'  + temp;          else          {              if (temp <= 0xf)                  data[2 - i] =  'a'  + temp - 10;          }      }                                              putstr( " Value of AIN0 is 0x" );      putstr(data);                                                  putstr( "\r" );      putstr( "\n" ); }                                         int  main( void ) {      rGPHCON = rGPHCON & ~(0xf << 4) | (0xa << 4);     //配置RDX0与TDX0      rGPHUP = 0X0c;      //设置上拉电阻                                              rUFCON0 = 0;     //不用FIFO</span></span>      rUMCON0 = 0;     //不用流控</span></span>      rULCON0 = 0X3;   //8位数据，1个停止位，无校验，正常模式      rUCON0 = 0X5;    //时钟源位PCLK,中断方式为查询      rUBRDIV0 = (( int )(50000000 / 115200 / 16) - 1);  //设置波特率为115200      rADCCON = 0x4c41;   //初始化ADC                                              putstr( "\nThis is ADC test:\n" );                                              unsigned  long  temp = 0;                                                  while (1)      {          while ((rADCCON & (1 << 15)) == 0);      //判断是否转换结束                                                  temp = rADCDAT0;      //读取转换值          itoa(temp);                                                          rADCCON = 0x4c41;      //再启动ADC          wait(200000);      }                                              return  0; }

     //start.S

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.text .global _start _start: #define WATCHDOG 0x53000000      ldr r0, =WATCHDOG      mov r1, #0      str r1, [r0]                                          ldr sp, =1024*4      bl main                                     loop:      b loop

     //Makefile

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adc.bin: start.S adc.c      arm-linux-gcc -c start.S -o start.o      arm-linux-gcc -c adc.c -o adc.o      arm-linux-ld -Ttext 0x30008000 start.o adc.o -o adc      arm-linux-objcopy -O binary -S adc adc.bin                                   clean:      rm  -f *.o adc.bin

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编译链接

     OK，成功！

本文转自infohacker 51CTO博客，原文链接:http://blog.51cto.com/liucw/1224923