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| 1 | #include <avr/io.h> | |
| 2 | #include <stdbool.h> | |
| 3 | #include "data.h" | |
| 4 | ||
| 5 | //PD data | |
| 6 | //PC control | |
| 7 | //PB programming + xtal + clocko (CKOUT fuse) | |
| 8 | ||
| 9 | #define CE (_BV(PC0)) | |
| 10 | #define WE (_BV(PC1)) | |
| 11 | #define READY (_BV(PC2)) | |
| 12 | ||
| 13 | inline static unsigned char get( uint16_t p){
| |
| 14 | return pgm_read_byte(&data[p]); | |
| 15 | } | |
| 16 | ||
| 17 | #define PRESCALER 8 | |
| 18 | ||
| 19 | #if PRESCALER == 1 | |
| 20 | #define PRESCALERSETTING _BV(CS10) | |
| 21 | #define SLEEPNTSC 59659 | |
| 22 | //wait an overflow before this | |
| 23 | #define SLEEPPALOVERSLEEP | |
| 24 | #define SLEEPPAL 6055 | |
| 25 | #elif PRESCALER == 8 | |
| 26 | #define PRESCALERSETTING _BV(CS11) | |
| 27 | #define SLEEPNTSC 7457 | |
| 28 | #define SLEEPPAL 8949 | |
| 29 | #elif PRESCALER == 64 | |
| 30 | #define PRESCALERSETTING _BV(CS11)|_BV(CS10) | |
| 31 | #define SLEEPNTSC 932 | |
| 32 | #define SLEEPPAL 1119 | |
| 33 | #endif | |
| 34 | ||
| 35 | ||
| 36 | ||
| 37 | void write(unsigned char c){
| |
| 38 | PORTD=c; | |
| 39 | PORTC&=~CE; | |
| 40 | PORTC&=~WE; | |
| 41 | while(PINC&READY){}//wait READY to go down
| |
| 42 | while((PINC&READY)==0){}//wait READY to go up
| |
| 43 | PORTC|=CE|WE; | |
| 44 | } | |
| 45 | ||
| 46 | ||
| 47 | int main(){
| |
| 48 | DDRD=0xFF; | |
| 49 | DDRC|=CE|WE; | |
| 50 | PORTC|=READY;//enable the pullup | |
| 51 | TCCR1A=0; | |
| 52 | TCCR1B=PRESCALERSETTING; | |
| 53 | PORTC|=CE|WE; | |
| 54 | uint16_t p=0; | |
| 55 | - | TCNT1=0; |
| 55 | + | |
| 56 | while(true){
| |
| 57 | unsigned char cmd=get(p++); | |
| 58 | switch(cmd){
| |
| 59 | case 0x4f: //game gear psg stereo | |
| 60 | p++; | |
| 61 | break; | |
| 62 | case 0x50://write value | |
| 63 | write(get(p++)); | |
| 64 | break; | |
| 65 | case 0x61:{//variable delay
| |
| 66 | uint16_t delay; | |
| 67 | unsigned char low,high; | |
| 68 | TCNT1=0; | |
| 69 | low=get(p++); | |
| 70 | high=get(p++); | |
| 71 | delay=high*256+low; | |
| 72 | while (TCNT1<delay){};
| |
| 73 | } | |
| 74 | break; | |
| 75 | case 0x62://NTSC delay | |
| 76 | TCNT1=0; | |
| 77 | while (TCNT1<SLEEPNTSC){};
| |
| 78 | break; | |
| 79 | case 0x63://PAL delay | |
| 80 | TCNT1=0; | |
| 81 | #ifdef SLEEPPALOVERSLEEP | |
| 82 | while (TCNT1<60000){};
| |
| 83 | #endif | |
| 84 | while (TCNT1<SLEEPPAL){};
| |
| 85 | break; | |
| 86 | case 0x66: | |
| 87 | p=0; | |
| 88 | break; | |
| 89 | } //switch | |
| 90 | }//while true | |
| 91 | }//main |
