【ARM】s3c2410 gpio debugging

Debugging preparation

Compilation tool: MDK470a

Development board: s3c2410

Debugging method: Get the hex file after compiling with mdk, convert it into bin file with hex2bin tool, download it via USB, and observe it on DNW

#define GPFCON (*(volatile unsigned long*)0x56000050)

#define GPFDAT (*(volatile unsigned long*)0x56000054)

//===PORT F GROUP

//Port: GPF7 GPF6 GPF5 GPF4 GPF3 GPF2 GPF1 GPF0

//Signal: LED_1 LED_2 LED_3 LED_4 FS2_INT GPLD_INT1 KEY_INT BUT_INT1

//Set properties: output output output output EINT3 EINT2 EINT1 EINT0

//Binary value: 01 01 01 01 00 00 00 00

int i,nout;  

int Main()  

{  

      GPFCON = 0x00005500;  

//GPFDAT = 0x00000050;    

           nout=0x000000F0;  

while(1)  

           {  

               GPFDAT=nout & 0x00000070;    

for(i=0; i<1000000; i++);  

               GPFDAT=nout & 0x00000030;    

for(i=0; i<1000000; i++);  

               GPFDAT=nout & 0x00000010;  

for(i=0; i<1000000; i++);  

               GPFDAT=nout & 0x00000000;    

for(i=0; i<1000000; i++);  

//led();

           }      

//return(0);

}  

Phenomenon: LED1~4 turn on and off in a cycle with equal time intervals

#define GPFCON (*(volatile unsigned long*)0x56000050)

#define GPFDAT (*(volatile unsigned long*)0x56000054)

int i,nout;

void led(void)

{

   GPFDAT=nout & 0x00000070;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000030;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000010;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000000;  

}

int Main()

{

      GPFCON = 0x00005500;

//GPFDAT = 0x00000050;

           nout=0x000000F0;

while(1)

           {

               GPFDAT=nout & 0x00000070; //μãááLED1

for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000030; //LED1/LED2

for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000010; //LED1/LED2/LED3

for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000000; //LED1/LED2/LED3/LED4

for(i=0; i<1000000; i++);

//led();

           }    

//return(0);

}

Phenomenon: LED1 and LED3 light up almost at the same time, LED2 lights up after a short while, LED4 lights up after a while, and then the cycle stops.

Note: Code-2 just adds a function in front of Code-1, but does not call it.

#define GPFCON (*(volatile unsigned long*)0x56000050)

#define GPFDAT (*(volatile unsigned long*)0x56000054)

int i,nout;

void led(void)

{

   GPFDAT=nout & 0x00000070;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000030;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000010;  

for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000000;  

}

int Main()

{

      GPFCON = 0x00005500;

//GPFDAT = 0x00000050;

           nout=0x000000F0;

while(1)

           {

/*

               GPFDAT=nout & 0x00000070; //μãááLED1

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000030; //LED1/LED2

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000010; //LED1/LED2/LED3

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000000; //LED1/LED2/LED3/LED4

               for(i=0; i<1000000; i++);

               */

               led();

           }    

//return(0);

}

Phenomenon: Same as Code-2 phenomenon

#define rGPFCON (*(volatile unsigned *)0x56000050)  

#define rGPFDAT (*(volatile unsigned *)0x56000054)

//#define rGPFUP (*(volatile unsigned *)0x56000058)  

void port_init(void)    

{

   rGPFCON=0x00005500;

// rGPFUP=0x0000ff;    

}

void led_on(void)  

{

int i,nout;

   nout=0x000000F0;

   rGPFDAT=nout & 0x00000070;  

for(i=0; i<100000; i++);

   rGPFDAT=nout & 0x00000030;  

for(i=0; i<100000; i++);

   rGPFDAT=nout & 0x00000010;  

for(i=0; i<100000; i++);

   rGPFDAT=nout & 0x00000000;  

for(i=0; i<100000; i++);

}

/*

void led_off(void)  

{

   int i,nout;

   nout=0;

   rGPFDAT=0;

   for(i=0; i<100000; i++);

   rGPFDAT=nout | 0x00000080;      

   for(i=0; i<100000; i++);

   rGPFDAT=nout | 0x00000040;      

   for(i=0; i<100000; i++);

   rGPFDAT=nout | 0x00000020;  

   for(i=0; i<100000; i++);

   rGPFDAT=nout | 0x00000000;  

   for(i=0; i<100000; i++);

}

void led_on_off(void)  

{

   int i;

   rGPFDAT=0;  

   for(i=0; i<100000; i++);

   rGPFDAT=0x000000F0;

   for(i=0; i<100000; i++);

}

*/

int main(void)

{

// port_init();

       rGPFCON=0x00005500;

while(1)

   {

       led_on();

// led_off();

// led_on_off();

   }

return(0);

}

/*

int i,nout;

void led(void)

{

   GPFDAT=nout & 0x00000070;  

   for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000030;  

   for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000010;  

   for(i=0; i<1000000; i++);

   GPFDAT=nout & 0x00000000;  

}

int Main()

{

      GPFCON = 0x00005500;

//GPFDAT = 0x00000050;

           nout=0x000000F0;

           while(1)

           {

               GPFDAT=nout & 0x00000070;  

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000030;  

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000010;  

               for(i=0; i<1000000; i++);

               GPFDAT=nout & 0x00000000;  

               for(i=0; i<1000000; i++);

               //led();

           }

      //return(0);

}

*/

Phenomenon: After downloading, the development board restarts directly when running y

analyze

At present, it seems that only Code-1 has achieved the desired effect. I have a lot of comments in the source code, but since they are all garbled when pasted, I deleted them all.

Code-1 and Code-2 should look the same on the PC platform, but the running results are very different. It should not be caused by the development board cache. It is probably caused by the compiler.

<1> Maybe MDK optimized the code, not the linker, but during compilation

<2>Code-4 causes the board to reboot directly. What is the reason?

It seems that I can't solve these two problems now. Let's put it aside for now and ask the teacher or the experts to help solve them next time.