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This commit is contained in:
Eggert Jung
2024-06-04 18:45:10 +02:00
commit 58fe6ef3b1
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551
Firmware/src/main.c Normal file
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#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <stdlib.h>
#include <util/delay.h>
#include <avr/pgmspace.h>
#ifdef GDBSTUB
#include "avr8-stub.h"
#else
#include "uart.h"
#endif
#include "lcd.h"
#include "twi.h"
#include "dataflash.h"
#include "music.h"
#define wait_joy_button() \
{ \
LCD_GotoXY(20, 7); \
LCD_PutChar(0x10); \
LCD_Update(); \
while (((PINA)&0x08)) \
; \
while (!((PINA)&0x08)) \
; \
_delay_ms(20); \
while (((PINA)&0x08)) \
; \
}
/* clang-format off */
const uint8_t PROGMEM emg_logo[640] =
{
0x80, 0xe0, 0xf0, 0xf8, 0xf8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xf8, 0xf8, 0xf0, 0xe0, 0x80, 0x00, 0x00, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xf0, 0xf8, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xf8, 0xf8, 0xf0, 0xe0, 0xc0, 0xe0, 0xf0, 0xf8, 0xf8, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xf8, 0xf8, 0xf0, 0xe0, 0x80, 0x00, 0x00, 0x80, 0xe0, 0xf0,
0xf8, 0xf8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xf8, 0xf8, 0xf0, 0xe0, 0x80, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xf7, 0xf3, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1,
0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf7, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x1f, 0x07, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x03, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x07, 0x03, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x03, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0x1f, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xf1, 0xe1, 0xc1, 0xc1, 0x81, 0x81, 0x81, 0x81, 0xc1, 0xc1, 0xc1,
0xc1, 0xc1, 0xc1, 0xe1, 0xe1, 0xe1, 0xe1, 0xe1, 0xe1, 0xe1, 0xe1, 0xe1,
0xe1, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00,
0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xe0,
0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0,
0xc0, 0xe0, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x07, 0x07, 0x0f, 0x0f, 0x0f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x0f, 0x0f, 0x0f, 0x07, 0x07, 0x03, 0x00, 0x00, 0x00, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x00, 0x00, 0x00, 0x03, 0x07,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x8f, 0xcf, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
0x1f, 0x0f, 0x07, 0x01,
};
/* clang-format on */
void demo_backlight(void);
void demo_start(void);
void demo_display(void);
void demo_show_emg(void);
void demo_uart(void);
void demo_music(void);
int main(void)
{
// set PA3-PA7 as input and activated internal Pull-Up
DDRA &= ~((1 << PINA3) | (1 << PINA4) | (1 << PINA5) | (1 << PINA6) | (1 << PINA7)); // Required for DMM Board 2013
PORTA |= ((1 << PINA3) | (1 << PINA4) | (1 << PINA5) | (1 << PINA6) | (1 << PINA7)); // Required for DMM Board 2013
// set PB0-PB3 as output
DDRB = 0x0F;
// set PB0-PB3 on high-level
PORTB |= 0x0F; // Required for DMM Board DMM Board 2013
#ifdef GDBSTUB
debug_init(); // required for debugging via UART
#else
UART_Init();
#endif
LCD_Init();
sei(); // enable interrupts after drivers initialized
//demo_start();
//demo_show_emg();
//#ifndef GDBSTUB // UART unavailable if used by GDB stub for debugging
//demo_uart();
//#endif
//demo_display();
//demo_backlight();
//demo_music();
Backlight_LED(BL_GREEN_ON);
//Backlight_Off();
//LCD_Clear();
// loop forever
uint32_t counter = 0;
uint8_t button_state = 1;
uint8_t button_state_old = 1;
while (1){
button_state = !(PINA & 0x08);
if( button_state == 1 && button_state_old == 0 ){
_delay_ms(20);
counter = 0;
}
if( button_state == 0 && button_state_old == 1 ){
_delay_ms(20);
/* print to LCD */
LCD_Clear();
LCD_GotoXY(0, 0);
char msg[20];
sprintf(msg, "time: %d", counter);
LCD_PutString(msg);
LCD_Update();
/* ------------ */
counter = 0;
}
counter++;
button_state_old = button_state;
_delay_ms(1);
}
}
void demo_start(void)
{
// Turn on green backlight
Backlight_LED(BL_GREEN_ON);
// Place program memory strings in framebuffer
LCD_PutString_P(PSTR("-DMM AVR-Board Demo- \r\n\n"));
LCD_PutString_P(PSTR("Always push the \r\n"));
LCD_PutString_P(PSTR("joystick button to \r\n"));
LCD_PutString_P(PSTR("proceed to the next \r\n"));
LCD_PutString_P(PSTR("screen. \r\n\n"));
LCD_PutString_P(PSTR("Enjoy the Fuck You! "));
// Copy framebuffer to display
LCD_Update();
// Wait for joystick button
wait_joy_button();
}
void demo_show_emg(void)
{
// Some counters
uint16_t emg_offset = 0;
uint8_t fb_x;
uint8_t fb_y;
// Turn on white backlight (red, green and blue)
Backlight_LED(BL_RED_ON | BL_GREEN_ON | BL_BLUE_ON);
// Clear precautionally
LCD_Clear();
// Copy emglogo into framebuffer
for (fb_y = 0; fb_y < 5; fb_y++)
for (fb_x = 0; fb_x < 128; fb_x++)
lcd_framebuffer[fb_y][fb_x] = pgm_read_byte(&emg_logo[emg_offset++]);
// Mark pages 0-4 for update
lcd_frameupdate = 0x1f;
// Add some text
LCD_GotoXY(0, 5);
LCD_PutString_P(PSTR(" Institut f\x81r Messt. \r\n"));
LCD_PutString_P(PSTR(" und Grundlagen der \r\n"));
LCD_PutString_P(PSTR(" Elektrotechnik \r\n"));
// And copy framebuffer to display
LCD_Update();
wait_joy_button();
}
#ifndef GDBSTUB
void demo_uart(void)
{
unsigned char loop = 1;
signed int c;
char buffer[10];
LCD_Clear();
Backlight_LED(BL_BLUE_ON);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("UART-Demonstration \r\n\n"));
LCD_PutString_P(PSTR("Setup your terminal: \r\n"));
LCD_PutString_P(PSTR("9600 Baud, 8N1 \r\n"));
LCD_PutString_P(PSTR("Use joystick to send \r\n"));
LCD_PutString_P(PSTR("some strings. \r\n"));
LCD_GotoXY(20, 7);
LCD_PutChar(0x10);
LCD_Update();
while ((!((PINA)&0x08)))
;
_delay_ms(20);
while (!((PINA)&0x08))
;
while (loop)
{
// Get net character from uart fifo
c = UART_GetChar();
// c = -1 means fifo empty
if (c > -1)
{
// wipe last lcd line
LCD_WipeLine(7);
LCD_GotoXY(0, 7);
LCD_PutString_P(PSTR("RX-ASCII-Code: "));
// Convert interger to ascii
itoa(c, buffer, 10);
LCD_PutString(buffer);
LCD_GotoXY(20, 7);
LCD_PutChar(0x10);
LCD_Update();
_delay_ms(10);
}
_delay_ms(20);
while (!((PINA)&0xF8))
; // Different to DMM 2012 and before
switch (((PINA)&0xF8))
{
case 0x78:
// Joystick Up
UART_PutString("Joystick Up.\r\n");
break;
case 0xB8:
// Joystick Down
UART_PutString("Joystick Down.\r\n");
break;
case 0xD8:
// Joystick Left
UART_PutString("Joystick Left.\r\n");
break;
case 0xE8:
// Joystick Right
UART_PutString("Joystick Right.\r\n");
break;
case 0xF0:
// Joystick Button
UART_PutString("Exit.\r\n\n");
loop = 0;
break;
}
_delay_ms(200);
}
}
#endif
void demo_music(void)
{
LCD_Clear();
Backlight_LED(BL_RED_ON);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Let's dance!\r\n\n"));
LCD_PutString_P(PSTR("(Finest PWM sounds!)\r\n\n"));
LCD_Update();
Music_PlayTrack(MUSIC_Tetris);
LCD_PutString_P(PSTR("OK, that's enough...\r\n\n"));
LCD_Update();
wait_joy_button();
}
void demo_display(void)
{
// switch white backlight on
Backlight_LED(BL_RED_ON | BL_GREEN_ON | BL_BLUE_ON);
// clear display
LCD_Clear();
// talking to the user
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Set some pixels."));
LCD_DrawPixel(10, 10, 1);
LCD_DrawPixel(12, 44, 1);
LCD_DrawPixel(111, 62, 1);
LCD_DrawPixel(101, 22, 1);
LCD_Update();
wait_joy_button();
// one display page requires 8 pages in dataflash
LCD_SavePage(0);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Connecting."));
LCD_DrawLine(10, 10, 12, 44, 1);
LCD_DrawLine(12, 44, 111, 62, 1);
LCD_DrawLine(111, 62, 101, 22, 1);
LCD_DrawLine(101, 22, 10, 10, 1);
LCD_Update();
wait_joy_button();
// first display page was stored at flash page 0
// second display page will start at 8
LCD_SavePage(8);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Adding circles."));
LCD_DrawCircle(64, 32, 10, 1);
LCD_DrawCircle(70, 30, 20, 1);
LCD_Update();
wait_joy_button();
// talking to the user
LCD_SavePage(16);
LCD_Clear();
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Clear/Set/XOR Demo."));
for (unsigned int fill = 0; fill < 128; fill++)
LCD_DrawLine(fill, 10, fill, 53, (fill / 8) & 1);
// Clear
LCD_DrawLine(0, 20, 127, 20, 0);
// Set
LCD_DrawLine(0, 30, 127, 30, 1);
// XOR
LCD_DrawLine(0, 40, 127, 40, 2);
LCD_Update();
wait_joy_button();
// talking to the user
LCD_SavePage(24);
LCD_Clear();
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Use the joystick to\r\n"));
LCD_PutString_P(PSTR("recall the last\r\n"));
LCD_PutString_P(PSTR("screens. Again,\r\n"));
LCD_PutString_P(PSTR("button means exit.\r\n"));
LCD_Update();
unsigned char loop = 1;
while (loop)
{
// wait
while ((!((PINA)&0xF8)))
; // Different to DMM 2012 and before
_delay_ms(300);
while (!((PINA)&0xF8))
; // Different to DMM 2012 and before
switch ((~PINA) & 0xF8) // Different to DMM 2012 and before
{
case 0x80:
// UP
LCD_LoadPage(0);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Screen 1"));
LCD_Update();
break;
case 0x40:
// DOWN
LCD_LoadPage(24);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Screen 4"));
LCD_Update();
break;
case 0x20:
// LEFT
LCD_LoadPage(8);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Screen 2"));
LCD_Update();
break;
case 0x10:
// RIGHT
LCD_LoadPage(16);
LCD_WipeLine(0);
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Screen 3"));
LCD_Update();
break;
case 0x08:
// BUTTON
loop = 0;
break;
}
}
// talking to the user
LCD_Clear();
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Push button for\r\n"));
LCD_PutString_P(PSTR("next demonstration.\r\n"));
wait_joy_button();
}
void demo_backlight(void)
{
unsigned char led_active = 0x80;
// white backlight
Backlight_LED(BL_RED_ON | BL_GREEN_ON | BL_BLUE_ON);
LCD_Clear();
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR("Use the joystick to\r\n"));
LCD_PutString_P(PSTR("toggle the backlight\r\n"));
LCD_PutString_P(PSTR("on the next screen."));
LCD_Update();
wait_joy_button();
// no backlight
Backlight_Off();
LCD_Clear();
LCD_GotoXY(0, 0);
LCD_PutString_P(PSTR(" Red \r\n"));
LCD_PutString_P(PSTR(" \r\n"));
LCD_PutString_P(PSTR(" \x18 \r\n"));
LCD_PutString_P(PSTR(" Green \x1b Exit \x1a Blue \r\n"));
LCD_PutString_P(PSTR(" \x19 \r\n"));
LCD_PutString_P(PSTR(" \r\n"));
LCD_PutString_P(PSTR(" Toggle \r\n"));
LCD_PutString_P(PSTR(" all \x10\r\n"));
LCD_Update();
while (!((PINA)&0x08))
;
_delay_ms(20);
while (!((PINA)&0x08))
;
while (led_active & 0x80)
{
while ((~(PINA)&0xF8))
; // Different to DMM 2012 and before
_delay_ms(300);
while (!((PINA)&0xF8))
; // Different to DMM 2012 and before
switch ((~PINA) & 0xF8) // Different to DMM 2012 and before
{
case 0x08:
// Button -> Exit
led_active = 0x00;
break;
case 0x80:
// Up -> Toggle Red
led_active ^= 0x01;
break;
case 0x20:
// Up -> Toggle Green
led_active ^= 0x04;
break;
case 0x10:
// Up -> Toggle Blue
led_active ^= 0x10;
break;
case 0x40:
// Up -> Toggle All
led_active ^= 0x15;
break;
}
while (!(PINA & 0xf8))
;
Backlight_LED(led_active & 0x15);
PORTB &= ~0x0f;
if (led_active & 0x01)
PORTB |= 0x01;
if (led_active & 0x04)
PORTB |= 0x02;
if (led_active & 0x10)
PORTB |= 0x04;
}
LCD_Clear();
}

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Firmware/src/music.c Normal file
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#include <stdint.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <util/atomic.h>
#include "music.h"
/* Sine lookup table for the PWM generator (pp = 32) */
static const PROGMEM unsigned char sine_lookup[]={
0x10,0x13,0x16,0x19,0x1b,0x1d,0x1f,0x20,
0x20,0x20,0x1f,0x1d,0x1b,0x19,0x16,0x13,
0x10,0x0d,0x0a,0x07,0x05,0x03,0x01,0x00,
0x00,0x00,0x01,0x03,0x05,0x07,0x0a,0x0d
};
const MUSIC_Note MUSIC_Tetris[] = {
{ MUSIC_E5, MUSIC_4 },
{ MUSIC_B4, MUSIC_8 },
{ MUSIC_C5, MUSIC_8 },
{ MUSIC_D5, MUSIC_4 },
{ MUSIC_C5, MUSIC_8 },
{ MUSIC_D5, MUSIC_8 },
{ MUSIC_A4, MUSIC_4 },
{ MUSIC_A4, MUSIC_8 },
{ MUSIC_C5, MUSIC_8 },
{ MUSIC_E5, MUSIC_4 },
{ MUSIC_D5, MUSIC_8 },
{ MUSIC_C5, MUSIC_8 },
{ MUSIC_B4, MUSIC_4 + MUSIC_8 },
{ MUSIC_C5, MUSIC_8 },
{ MUSIC_D5, MUSIC_4 },
{ MUSIC_E5, MUSIC_4 },
{ MUSIC_C5, MUSIC_4 },
{ MUSIC_A4, MUSIC_4 },
{ MUSIC_A4, MUSIC_8 },
MUSIC_END };
static void delay_ms(uint16_t delay);
static void pwm_init (void);
static void pwm_deinit (void);
static void pwm_gen(uint16_t tone, uint16_t periods);
void Music_PlayTrack (MUSIC_Track track)
{
pwm_init();
while (!MUSIC_IS_END(*track)) {
if (track->tone == 0) {
delay_ms(track->duration);
} else {
uint16_t periods = (uint32_t)track->duration * (uint32_t)track->tone / 1000;
pwm_gen(track->tone, periods);
delay_ms(MUSIC_32 / 2);
}
++track;
}
pwm_deinit();
}
static void delay_ms(uint16_t delay)
{
while (delay--)
_delay_ms(1);
}
void pwm_init (void)
{
//setup PWM timer
DDRD |= _BV(PIND5); // speaker pin => output
TCCR1A = _BV(COM1A1) | _BV(COM1A0) | _BV(WGM10); //set on match
TCCR1B = _BV(CS10) | _BV(WGM12); //fast PWM (8 bit), clk/1 source
//setup sample timer (CTC Mode)
TCCR3A = 0;
TCCR3B = _BV(CS30) | _BV(WGM32); // clk/1
}
void pwm_deinit (void)
{
TCCR1A = 0;
TCCR1B = 0;
TCCR3A = 0;
TCCR3B = 0;
}
void pwm_gen(uint16_t tone, uint16_t periods)
{
//calculate single sine sample duration
OCR3A = F_CPU / tone / sizeof(sine_lookup) - 1;
for (uint16_t period=0; period < periods; ++period) {
for (uint8_t spl=0; spl < sizeof(sine_lookup); ++spl) {
//wait for timer ready for next spl
loop_until_bit_is_set(TIFR3, OCF1A);
TIFR3 = _BV(OCF1A); //clear OCF
OCR1A = pgm_read_byte(sine_lookup + spl) + 0x70;
}
}
}