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）
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）
串口的初始化
见《串口通信·FS2410》：http://infohacker.blog.51cto.com/6751239/1223137
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;
}
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//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
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//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
