【ARM】ADC·FS2410数模转换

开发环境 1、硬件平台：FS2410 2、主机：Ubuntu 12.04
ADC寄存器配置
1、初始化ADC（ADCCON）650) this.width=650;" src="http://img1.51cto.com/attachment/201306/110328378.jpg" title="初始化ADC（ADCCON）.jpg" /> 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）650) this.width=650;" src="http://img1.51cto.com/attachment/201306/110611513.jpg" title="ADCDAT.jpg" />
串口的初始化
见《串口通信·FS2410》：http://infohacker.blog.51cto.com/6751239/1223137

源代码

//adc.c

#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

.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

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

编译链接

650) this.width=650;" src="http://img1.51cto.com/attachment/201306/112629738.jpg" title="成功编译生成adc点bin.jpg" />
OK，成功！


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