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Minimal encoder input handling

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It is now possible to act on the encoders input. No effort regarding
debouncing and dechattering has been done yet.
This commit is contained in:
finga 2021-03-01 16:46:40 +01:00
parent 3b2bf1d967
commit 86ec90b202
1 changed files with 59 additions and 16 deletions
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75
firmware/src/main.c
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@ -1,6 +1,7 @@
#define F_CPU 8000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdbool.h>
@ -13,6 +14,9 @@
#define LCD_CD PB0
#define LCD_RST PB1
#define ENC_A (PINB & (1 << PB6))
#define ENC_B (PINB & (1 << PB7))
const uint8_t splash[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF0, 0xF8, 0xFC, 0xFC, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFE, 0xFE, 0xFC, 0xFC, 0xF8, 0xF0, 0xF0, 0xE0, 0xC0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0xF0, 0xFC, 0xFE, 0xFF, 0xFF, 0x7F, 0x3F, 0x1F, 0x3F, 0x3F, 0x7F, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0x0F, 0x0F, 0x07, 0x07, 0x07, 0x03, 0xC3, 0xE3, 0x73, 0x37, 0x17, 0x07, 0x0F, 0x1E, 0x3C, 0xF0, 0x80, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xE7, 0xC3, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F, 0x00, 0x00, 0xFC, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFC, 0x30, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00, 0x00,
@ -21,6 +25,8 @@ const uint8_t splash[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80,
0xE0, 0x60, 0xE0, 0x00, 0x00, 0xE0, 0x60, 0xE0, 0x00, 0x00, 0xE0, 0x60, 0xF8, 0x00, 0x00, 0xE0, 0xA0, 0xE0, 0x00, 0x00, 0xE0, 0x20, 0x60, 0x00, 0x00, 0xE0, 0xA0, 0xA0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xE0, 0x60, 0xE0, 0x00, 0x00, 0xE0, 0x20, 0x60, 0x00, 0x00, 0xE0, 0x60, 0xE0,
0x03, 0x02, 0x03, 0x00, 0x00, 0x03, 0x00, 0x03, 0x00, 0x00, 0x03, 0x02, 0x03, 0x00, 0x00, 0x03, 0x02, 0x02, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x03, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03, 0x02, 0x03, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x0B, 0x0A, 0x0F};
static uint8_t enc = 0;
void spi_init(void) {
SPI_DDR |= (1 << SPI_SCK) | (1 << SPI_MOSI) | (1 << SPI_SS);
SPI_PORT |= (1 << SPI_SS);
@ -86,32 +92,69 @@ void lcd_splash() {
}
}
// Encoder rotation interrupt
ISR(PCINT0_vect) {
cli();
switch(enc) {
case 0:
if (ENC_A && !ENC_B)
enc = 1;
else if (!ENC_A && ENC_B)
enc = 3;
break;
case 1:
if (ENC_A && ENC_B) {
enc = 2;
} else if (!ENC_A && !ENC_B) {
enc = 0;
}
break;
case 2:
if (!ENC_A && ENC_B)
enc = 3;
else if (ENC_A && !ENC_B)
enc = 1;
break;
case 3:
if (!ENC_A && !ENC_B) {
enc = 0;
} else if (ENC_A && ENC_B) {
enc = 2;
}
break;
}
// TODO: proper debounce and dechattering
_delay_us(100);
sei();
}
int main(void) {
// FastPWM: 1.25kHz
// TODO: Try to get the backlit even more dim
TCCR0A = (1 << WGM01) | (1 << WGM00) | (1 << COM0B1);
TCCR0B = (1 << CS01) | (1 << WGM02); // prescaler = 8;
OCR0A = 100;
OCR0B = 10;
OCR0B = 0;
DDRD |= (1 << PD5);
bool reverse = 0;
// SPI setup
spi_init();
lcd_init();
// Encoder setup
PORTB |= (1 << PB6) | (1 << PB7);
PCICR |= (1 << PCIE0);
PCMSK0 |= (1 << PCINT6) | (1 << PCINT7);
// Show splash screen
lcd_splash();
while (1) {
_delay_ms(1);
// Enable interrupts
sei();
if (OCR0B > 100)
reverse = !reverse;
if (reverse)
OCR0B++;
else
if (OCR0B > 0)
OCR0B--;
else
reverse = !reverse;
}
// Run...
for (;;);
}