repo2/unmerged/zpu_firmware/replay/main.c @ 1475
| 1 | markw | #include "regs.h"
|
|
#include "led.h"
|
|||
void
|
|||
wait_us(int unsigned num)
|
|||
{
|
|||
// 28ish
|
|||
int unsigned cycles = num*28;
|
|||
*zpu_pause = cycles;
|
|||
}
|
|||
void clear_64k_ram()
|
|||
{
|
|||
int i=0;
|
|||
// sdram from 8MB to 16MB
|
|||
// sram from 0x200000
|
|||
*zpu_ledr = 0xf0f0f0f0;
|
|||
*zpu_ledg = 0x0;
|
|||
//wait_us(200000);
|
|||
for (i=0x200000; i!=0x210000; i+=1)
|
|||
{
|
|||
// TODO - use short!
|
|||
*(unsigned char volatile *)(i) = 0x0000;
|
|||
}
|
|||
*zpu_ledr = 0x55555555;
|
|||
*zpu_ledg = 0x55555555;
|
|||
for (i=0x800000; i!=0x810000; i+=4)
|
|||
{
|
|||
*(unsigned int volatile *)(i) = 0x00000000;
|
|||
}
|
|||
*zpu_ledr = 0;
|
|||
*zpu_ledg = 0xf0f0f0f0;
|
|||
//wait_us(200000);
|
|||
return;
|
|||
}
|
|||
void reset_6502(unsigned int reset_n)
|
|||
{
|
|||
int prev = *zpu_config;
|
|||
if (reset_n == 1)
|
|||
*zpu_config = prev&~(1<<7);
|
|||
else
|
|||
*zpu_config = prev|(1<<7);
|
|||
// USES ASHIFTLEFT even with it disabled!! *reset_6502 = reset_n<<7;
|
|||
}
|
|||
void pause_6502(unsigned int pause)
|
|||
{
|
|||
int prev = *zpu_config;
|
|||
if (pause == 0)
|
|||
*zpu_config = prev&~(1<<6);
|
|||
else
|
|||
*zpu_config = prev|(1<<6);
|
|||
// USES ASHIFTLEFT even with it disabled!! *reset_6502 = reset_n<<7;
|
|||
}
|
|||
int main(void)
|
|||
{
|
|||
unsigned int i=0;
|
|||
unsigned char temp = 0;
|
|||
pause_6502(1);
|
|||
//wait_us(200000);
|
|||
reset_6502(0);
|
|||
*atari_nmien = 0x00;
|
|||
clear_64k_ram();
|
|||
reset_6502(1);
|
|||
pause_6502(0);
|
|||
for(;;);
|
|||
}
|