#86606 - Ant6n - Thu Jun 08, 2006 6:31 am
Hey,
I am disturbing the peace and quietness in these forums again to bring up a question of the past...
I am trying to get a little library working (to be used in some class); I would like it to be standalone, so libga is not much of an option.
For the time being I would like to use tonc's intterrupt handler,
http://user.chem.tue.nl/jakvijn/tonc/interrupts.htm, because as I understand it can handle multiple interrupts, but they are not nested (i.e. they are run one after another).
It doesnt seem to do anything. Right now I am using visual ham (as far as I know it shouldnt make much of a difference what compiler to use).
I have the handler, 'irqhandler.S'
and the lib_interrupt.c
and some main.c
this code should basicly invert the backdrop coloer in mode 4 every 80th scanline, so it should flash a lot. It doesnt. If I set the little 'hblank' function directly as the handler, then it does. I somehow suspect there might be a general problem here. As far as i know ham supports interworking, so I am kind of stuck... any ideas?
thank you
Anton Dubrau
I am disturbing the peace and quietness in these forums again to bring up a question of the past...
I am trying to get a little library working (to be used in some class); I would like it to be standalone, so libga is not much of an option.
For the time being I would like to use tonc's intterrupt handler,
http://user.chem.tue.nl/jakvijn/tonc/interrupts.htm, because as I understand it can handle multiple interrupts, but they are not nested (i.e. they are run one after another).
It doesnt seem to do anything. Right now I am using visual ham (as far as I know it shouldnt make much of a difference what compiler to use).
I have the handler, 'irqhandler.S'
| Code: |
| .extern interrupttable
.section .iwram,"ax",%progbits .code 32 .align 2 .global interrupthandler interrupthandler: @ (1) @ Single interrupts support mov r3, #0x04000000 @ REG_BASE ldr r2, [r3, #0x200] @ Read REG_IE and REG_IF and r1, r2, r2, lsr #16 @ r1 = REG_IE & REG_IF @ (2) ldrh r2, [r3, #-8] @\mix up with BIOS irq flags at 3007FF8h, orr r2, r2, r1 @ aka mirrored at 3FFFFF8h, this is required strh r2, [r3, #-8] @/when using the (VBlank)IntrWait functions @ (3) add r3, r3, #0x200 ldr r2, =interrupttable @ V-Blank Interrupt ands r0, r1, #0x0001 bne .Ljump_intr add r2, r2, #4 @ H-Blank Interrupt ands r0, r1, #0x0002 bne .Ljump_intr add r2, r2, #4 @ V Counter Interrupt ands r0, r1, #0x0004 bne .Ljump_intr add r2, r2, #4 @ Timer 0 Interrupt ands r0, r1, #0x0008 bne .Ljump_intr add r2, r2, #4 @ Timer 1 Interrupt ands r0, r1, #0x0010 bne .Ljump_intr add r2, r2, #4 @ Timer 2 Interrupt ands r0, r1, #0x0020 bne .Ljump_intr add r2, r2, #4 @ Timer 3 Interrupt ands r0, r1, #0x0040 bne .Ljump_intr add r2, r2, #4 @ Serial Communication Interrupt ands r0, r1, #0x0080 bne .Ljump_intr add r2, r2, #4 @ DMA0 Interrupt ands r0, r1, #0x0100 bne .Ljump_intr add r2, r2, #4 @ DMA1 Interrupt ands r0, r1, #0x0200 bne .Ljump_intr add r2, r2, #4 @ DMA2 Interrupt ands r0, r1, #0x0400 bne .Ljump_intr add r2, r2, #4 @ DMA3 Interrupt ands r0, r1, #0x0800 bne .Ljump_intr add r2, r2, #4 @ Key Interrupt ands r0, r1, #0x1000 bne .Ljump_intr add r2, r2, #4 @ Cart Interrupt ands r0, r1, #0x2000 strneb r0, [r3, #0x84-0x200] @ Stop sound if cart removed (REG_SOUNDCNT_X) .Lloop: bne .Lloop @ Infinite loop if cart removed @ (4) .Ljump_intr: strh r0, [r3, #2] @ Acknowlegde int (will clear REG_IF) ldr r0, [r2] @ Jump to user IRQ process bx r0 .align 2 .pool |
and the lib_interrupt.c
| Code: |
| #include "lib_interrupt.h"
#include "lib_type.h" fnptr interrupttable[14]; extern fnptr interrupthandler; extern fnptr hblank; void irq_set(int flags, fnptr irq_handle, int priority) { int i; for(i = 0; i < 14; i++) { if(flags & BIT(i)) interrupttable[i] = irq_handle; } REG_IRQ_HANDLER = interrupthandler; REG_IME = 0; REG_IE |= flags; REG_IME = 1; } void irq_disable(int flags) { REG_IME = 0; REG_IE &= ~flags; REG_IME = 1; } |
and some main.c
| Code: |
|
#include "lib_math.h" #include "lib_time.h" #include "lib_register.h" #include "lib_interrupt.h" fnptr* IntrTable; void WaitForVblank(void) { while(!(REG_DISPSTAT & 1)); while(REG_DISPSTAT & 1); } void hblank(void) { *(vu16*)0x05000000 ^= 0x7FFF; } int main(void) { unsigned char x,y; REG_DISPCNT = (4 | 1024); *(vu16*)0x05000000 = 31*32; for(x = 0; x < 240; x++) for(y = 0; y < 160; y++) ((vu16*)0x06000000)[x+ y * 240] = 0; //set up our interrupt REG_DISPSTAT = 32 | (80 << 8); irq_set(4,hblank,0); while(1) { WaitForVblank(); //*(vu16*)0x05000000 = 31*32; } return 0; } |
this code should basicly invert the backdrop coloer in mode 4 every 80th scanline, so it should flash a lot. It doesnt. If I set the little 'hblank' function directly as the handler, then it does. I somehow suspect there might be a general problem here. As far as i know ham supports interworking, so I am kind of stuck... any ideas?
thank you
Anton Dubrau