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Atomic access to the PORT registers on Mega and Leonardo.

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2013-08-31 14:43:42 +00:00
parent 23990a42e3
commit 6e376721ce
1 changed files with 8 additions and 8 deletions
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lib/Charliplexing.cpp
+8 -8
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@@ -490,10 +490,10 @@ ISR(TIMER1_COMPA_vect) {
// their state is preserved when writing to the ports.
if (page < SHADES - 1) {
const uint16_t data = *displayPointer++, dir = data | (1 << (cycle+2));
PORTE = (PORTE & (~0x38)) | ((data << 1) & 0x38);
PORTG = (PORTG & (~0x20)) | ((data << 0) & 0x20);
PORTH = (PORTH & (~0x78)) | ((data >> 3) & 0x78);
PORTB = (PORTB & (~0xf0)) | ((data >> 6) & 0xf0);
PINE = (PORTE ^ (data << 1)) & 0x38;
PING = (PORTG ^ (data << 0)) & 0x20;
PINH = (PORTH ^ (data >> 3)) & 0x78;
PINB = (PORTB ^ (data >> 6)) & 0xf0;
DDRE |= ((dir << 1) & 0x38);
DDRG |= ((dir << 0) & 0x20);
DDRH |= ((dir >> 3) & 0x78);
@@ -508,10 +508,10 @@ ISR(TIMER1_COMPA_vect) {
if (page < SHADES - 1) {
const uint16_t data = *displayPointer++, dir = data | (1 << (cycle));
PORTB = (PORTB & (~0xF0)) | ((data >> 4) & 0xF0);
PORTC = (PORTC & (~0xC0)) | ((data << 4) & 0xC0);
PORTD = (PORTD & (~0xD3)) | ((data << 0) & 0xD3);
PORTE = (PORTE & (~0x40)) | ((data << 1) & 0x40);
PINB = (PORTB ^ (data >> 4)) & 0xF0;
PINC = (PORTC ^ (data << 4)) & 0xC0;
PIND = (PORTD ^ (data << 0)) & 0xD3;
PINE = (PORTE ^ (data << 1)) & 0x40;
DDRB |= ((dir >> 4) & 0xF0);
DDRC |= ((dir << 4) & 0xC0);
DDRD |= ((dir << 0) & 0xD3);