【ARM】ADC·FS2410 digital-to-analog conversion

Development Environment

1. Hardware platform: FS2410

2. Host: Ubuntu 12.04

ADC Register Configuration

1. Initialize ADC (ADCCON)

Set the prescaler, prescaler factor, select the A/D conversion channel, select normal mode and start the conversion

2. Determine whether the conversion is completed (ADCCON[5])

3. Read conversion results (ADCDATn)

Initialization of the serial port

See "Serial Port Communication FS2410": http://infohacker.blog.51cto.com/6751239/1223137

source code

 //adc.c

#include "2410addr.h" //header file, including register settings

void putc(char ch) //send character

{

    while(!(rUTRSTAT0 & 0X2)); //Judge whether the send buffer is empty

    rUTXH0 = ch; //send

}

char getc(void) //Receive character

{

    while(!(rUTRSTAT0 & 0X1)); //Judge whether the receiving buffer is empty

    return rURXH0; //receive

}

void putstr(char *str) //Send string

{

    while(*str != '')

    {

        if(*str == 'n')

        {

            putc('n');

            putc('r');

        }

        else

            putc(*str);

        str++;

    }

}

void wait(long long max) //delay function

{

    for(; max > 0; max--)

        ;

}

void itoa(unsigned long value) // character conversion

{ 

    unsigned long temp;

    int i, flag = 0;

    char data[4];

    for(i = 0; i < 4; i++) // Clear the array

        data[i] = '';

    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); //Configure RDX0 and TDX0

    rGPHUP = 0X0c; //Set the pull-up resistor

    rUFCON0 = 0;    //不用FIFO

    rUMCON0 = 0; //No flow control required

    rULCON0 = 0X3; //8-bit data, 1 stop bit, no parity, normal mode

    rUCON0 = 0X5; //Clock source bit PCLK, interrupt mode is query

    rUBRDIV0 = ((int)(50000000 / 115200 / 16) - 1); //Set the baud rate to 115200

    rADCCON = 0x4c41; //Initialize ADC

    putstr("nThis is ADC test:n");

    unsigned long temp = 0;

    while(1)

    {

        while((rADCCON & (1 << 15)) == 0); //Judge whether the conversion is completed

        temp = rADCDAT0; //Read conversion value

        temperature(temp);

        rADCCON = 0x4c41; //Restart 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

Compile and link

 OK, success!