diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 75 |
1 files changed, 44 insertions, 31 deletions
@@ -44,14 +44,16 @@ int main (void) { /* watchdog reset after ~4 seconds */ MCUSR &= ~_BV(WDRF); - WDTCSR = _BV(WDCE) | _BV(WDE); - WDTCSR = _BV(WDE) | _BV(WDP3); + WDTCR = _BV(WDCE) | _BV(WDE); + WDTCR = _BV(WDE) | _BV(WDP3); MCUCR = _BV(ISC10); GIMSK = _BV(INT1); ACSR |= _BV(ACD); + PRR = _BV(PRUSI) | _BV(PRUSART); + POS = 0; APOS = 0; DDRD = 0; @@ -138,14 +140,14 @@ ISR(INT1_vect) DDRD = _BV(PD3); - // 15us loop - r31 / r30 need not be preserved + // 15us loop - r31 / r28 need not be preserved asm volatile ("ldi r31, 0"); - asm volatile ("ldi r30, 15"); // Z = 120 + asm volatile ("ldi r28, 15"); // Z = 15 asm volatile ("wdr"); // <----- asm volatile ("wdr"); asm volatile ("wdr"); - asm volatile ("sbiw r30, 1"); - asm volatile ("cp r30, r1"); + asm volatile ("sbiw r28, 1"); + asm volatile ("cp r28, r1"); asm volatile ("brne .-12"); // -^ DDRD = 0; @@ -156,27 +158,38 @@ ISR(INT1_vect) POS <<= 1; } else { - APOS++; POS = 1; - if (APOS == 1) - BYTE = ~ADDR7; - else if (APOS == 2) - BYTE = ~ADDR6; - else if (APOS == 3) - BYTE = ~ADDR5; - else if (APOS == 4) - BYTE = ~ADDR4; - else if (APOS == 5) - BYTE = ~ADDR3; - else if (APOS == 6) - BYTE = ~ADDR2; - else if (APOS == 7) - BYTE = ~ADDR1; - - else if (APOS == 8) { - LASTCMD = 0; - POS = 0; - } + asm volatile ("in r28, 0x28"); // APOS + asm volatile ("inc r28"); // APOS++ + asm volatile ("cpi r28, 1"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR7)); + asm volatile ("cpi r28, 2"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR6)); + asm volatile ("cpi r28, 3"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR5)); + asm volatile ("cpi r28, 4"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR4)); + asm volatile ("cpi r28, 5"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR3)); + asm volatile ("cpi r28, 6"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR2)); + asm volatile ("cpi r28, 7"); + asm volatile ("brne .+2"); + asm volatile ("ldi r29, %0" : : "i" (~ADDR1)); + asm volatile ("out 0x1d, r29"); // BYTE + + asm volatile ("cpi r28, 8"); + asm volatile ("brne .+4"); + asm volatile ("out 0x3c, r1"); // LASTCMD - OC0B + asm volatile ("out 0x2a, r1"); // BUF - OC1A + + asm volatile ("out 0x28, r28"); // APOS } } else if (LASTCMD == 0xf0) { @@ -186,14 +199,14 @@ ISR(INT1_vect) //if (BYTE & POS) { DDRD = _BV(PD3); - // 15us loop - r31 / r30 need not be preserved - asm volatile ("ldi r31, 0"); - asm volatile ("ldi r30, 15"); // Z = 120 + // 15us loop - r29 / r28 need not be preserved + asm volatile ("ldi r29, 0"); + asm volatile ("ldi r28, 15"); // Z = 15 asm volatile ("wdr"); // <----- asm volatile ("wdr"); asm volatile ("wdr"); - asm volatile ("sbiw r30, 1"); - asm volatile ("cp r30, r1"); + asm volatile ("sbiw r28, 1"); + asm volatile ("cp r28, r1"); asm volatile ("brne .-12"); // -^ DDRD = 0; |