OK6410 Assembly Program Exercise

Try to use the 6410 assembly, and find that it is similar to the 51 of that year. Learn step by step

1. ;****************************************************** *************************************************** **********  

2. ;* File name: ok6410.s  

3. ;* Function: S3C6410 assembly  

4. ;* Author: cp1300@139.com  

5. ;* Created: January 4, 2013 21:27  

6. ;* Last modified: January 4, 2013  

7. ;* Details:        

8. ;****************************************************** *************************************************** **********/  

9.   

10. TINT_CSTAT EQU 0x7F006044 ;Timer interrupt control and status register  

11. VIC0ADDRESS EQU 0x71200F00 ; Current vector address register 0, write any data to clear interrupt  

12. VIC1ADDRESS EQU 0x71300F00 ; Current vector address register 1, write any data to clear interrupt  

13.   

14. ;Call external function  

15.     IMPORT LED1_flash ;LED1 flashing program  

16.       

17. ; External call function  

18.     EXPORT Time_Isr ; Clock interrupt service routine  

19.       

20.       

21.       

22.     PRESERVE8;  

23.     AREA S3C6410_CPU, CODE, READONLY       

24.   

25. ;Timer 1 interrupt service routine, note: after entering the interrupt, 6410 automatically switches to IRQ mode and turns off the IRQ interrupt. When exiting, you need to turn it on yourself or restore the CPSR     

26. Time_Isr  

27.     STMFD SP!, {R0,R1,LR} ;R0,R1,LR pushed onto the stack  

28.       

29.     LDR R0, =TINT_CSTAT           

30.     LDR R1, [R0] ; Read register TINT_CSTAT  

31.     ORR R1, R1, #0x01<<6 ; Write BIT6 to clear timer 1 interrupt  

32.     STR R1, [R0] ; write back register  

33.       

34.     BL LED1_flash ;Call LED flashing program  

35.       

36.     LDR R0, =VIC0ADDRESS ; Write VIC's current interrupt address register to clear the interrupt  

37.     LDR R1, =0xffffffff  

38.     STR R1, [R0]  

39.     LDR R0, =VIC1ADDRESS  

40.     STR R1, [R0]      

41.       

42.     LDMFD SP!, {R0,R1,LR} ;R0,R1,LR pop  

43.       

44.     ;When using SUB before, it was found that the program did not recover from SPSR after exiting from the interrupt, that is, the interrupt mask was not removed. After adding -S, this instruction will affect the flag bit in CPSR, which means that SPSR_IRQ is restored to CRSP  

45.     SUBS PC, LR, #4; To exit from the interrupt program, LR needs to be decremented by 4 and put into PC, but the subroutine call does not need -4, which should be caused by the pipeline instruction prefetch  

46.       

47.   

48.   

49.   

50.     END  

51.       

52.       

53.       

1. /****************************************************** *************************************************** ********** 

2. ;* File name: ok6410.h 

3. ;* Function: S3C6410 assembly function definition 

4. ;* Author: cp1300@139.com 

5. ;* Created: January 4, 2013 21:27 

6. ;* Last modified: January 4, 2013 

7. ;* Details:       

8. ;****************************************************** *************************************************** **********/  

9.   

10. #ifndef S3C6410_H_  

11. #define S3C6410_H_  

12.   

13.   

14. void Time_Isr(void); //Timer 1 interrupt service routine  

15.   

16. #endif /*S3C6410_H_*/  

1. #include "system.h"  

2. #include "uart.h"  

3. #include "tft_lcd.h"  

4. #include "other.h"  

5. #include "delay.h"  

6. #include "timer.h"  

7. #include "s3c6410.h"  

8.   

9. void LED1_flash(void);  

10.   

11. /****************************************************** *************************************************** ************************ 

12. *Function: void Timer_Init(u32 RTime,FunctionalState EnInt,void (*TimerIsr)(void)) 

13. *Function: Timer 1 initialization function 

14. *Parameters: None 

15. *Return: None 

16. *Depends on: underlying macro definitions 

17. *Author : cp1300@139.com 

18. *Time : 20120520 

19. *Last modified: 20120520 

20. * Note: Timer 0 and Timer 1 share the same prescaler 

21. *************************************************** *************************************************** *********************/  

22. void Timer_Init(u32 RTime,FunctionalState EnInt,void (*TimerIsr)(void))  

23. {  

24.     rTCFG0 |= 65; //Timer 0 pre-divided by 65+1, PCLK=66 provides the clock, 66 division generates 1MHz timer clock,  

25.     rTCON &= (~0xff00); //Clear settings  

26.     rTCON |= BIT11; //Timer 1 automatic update enable  

27.     rTCNTB1 = RTime; //Reload value  

28.     rTINT_CSTAT |= BIT6; //Clear interrupt flag  

29.     rTINT_CSTAT |= (EnInt == ENABLE) ? BIT1 : 0; // Enable timer 0 interrupt  

30.     Set_IsrAddr(INT_TIMER1,(u32)TimerIsr); //Set interrupt vector entry  

31.     Set_IntEnable(INT_TIMER1,EnInt); //Enable timer 1 global interrupt  

32.     //The following operation starts timer 0  

33.     rTCON |= BIT9; //manual update  

34.     rTCON &= ~BIT9; //End manual update  

35.     rTCON |= BIT8; //Start timer 0      

36. }  

37.   

38.   

39.   

40. //Main function  

41. int main(void)  

42. {         

43. //u16 data;  

44.       

45.     UART0_Init(DISABLE,115200); //Initialize the serial port, disable interrupt reception, baud rate 115200  

46.     LCD_Init(); //Initialize LCD  

47.     LED_Init(); //Initialize LED  

48.     Timer_Init(400000-1,ENABLE,Time_Isr); //Initialize timer 1, period 400ms  

49.       

50.     while(1);     

51. }  

52.   

53.   

54.   

55.   

56. //LED1 flashing program, flashing in timer 1 interrupt service program, period 400MS  

57. void LED1_flash(void)  

58. {  

59.     LED1_FLASH();  

60. }