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150 lines
4.0 KiB
150 lines
4.0 KiB
#include <xc.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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//#include <avr/sleep.h>
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//#include <util/atomic.h>
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//#include <avr/wdt.h>
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//tests5 tested and works (at ~950hz). unplug cable to programmer to see pin 4 active.
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//however...
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//tests6 DEADEND
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//never worked right. giving up and using delay.
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//reference: https://www.avrfreaks.net/forum/sample-project-attiny10
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//https://blog.podkalicki.com/attiny13-blinky-with-timer-compa/
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//watchdog is too slow and inaccurate to get 6000Hz
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//ISR(TIM0_COMPA_vect)
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//{
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// // Toggle PB2 Hi/Low depending on current state
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// PINB = 1<<2;
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// TIFR0 |= 1<<OCF0A; //clear flag (is this required here? documentation unclear)
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// //PORTB ^= _BV(LED_PIN); // toggle LED pin
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//}
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/*
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Delay in powerdown mode. Wake up by watchdog interrupt.
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* //NOTE: see earlier code, e.g. tests3 in attiny10 elec projects 2020
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*/
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/*
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void delay_power_down_wdt(uint8_t wdto)
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{
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wdt_reset();
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wdt_enable(wdto);
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WDTCSR |= (1<<WDIE);
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//so far (with 128Khz clk) this sleep will be about 30-40 seconds.
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//(however, I'll add the below to)
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//adjust sleep speed here:
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// 0110 is 1hz at 128KHz
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//WDTCSR |= (0<< WDP3);
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//WDTCSR |= (1<< WDP2);
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//WDTCSR |= (1<< WDP1);
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//WDTCSR |= (0<< WDP0);
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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sleep_enable();
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// Make sure interrups are enabled and the I flag is restored
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NONATOMIC_BLOCK(NONATOMIC_RESTORESTATE)
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{
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sleep_cpu();
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wdt_disable();
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}
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sleep_disable();
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}
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*/
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int main(void)
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{
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//////// OCR0A = 0;
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//////// TCNT0 = 0;
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//////// TCCR0A = 0;
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//////// TCCR0B = 0;
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////////
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//////// TCCR0A |= _BV(WGM01); // set timer counter mode to CTC
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//////// // TCCR0B |= _BV(CS02)|_BV(CS00); // set prescaler to 1024 (CLK=1200000Hz/1024/256=4.57Hz, 0.22s)
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//////// TCCR0B |= _BV(CS00); // set prescaler to 1 (CLK=1MHz/1)
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//OCR0A is 16 bits. in ASM it must be loaded separately.
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//in C, it can be loaded > 256? (test)
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//520 about 950hz, 25us wide pulse
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//OCR0A = 520; // with one timer, ever 166.667hz we want to count once (3000hz)
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//OCR0A = 1; //475hz
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//this goes to 475hz (pulses). doesn't make sense.
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//// OCR0AH = 0xFF; //
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//// OCR0AL = 0xFF;
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//attiny10 output compare broken apparently
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//this still 960hz, with 100us or so pulse size (high is 100us, low is longer)
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//OCR0A = 100;
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//inline asm to load values into 16 bit register
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//; variables
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//; For 1 Hz output, the timer delay has to be 1/2 second (1/2 second on / 1/2 second off)
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//; delay = OCR0A * 1024 * 8 / 8000000
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//; for 1/2 second, OCR0A = 488 (0x01E8)
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//.EQU OCR0AHigh = 0x01
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//.EQU OCR0ALow = 0xe8
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// in bash type: printf "%x\n" 488
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//.EQU OCR0AHigh = 0x02
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//.EQU OCR0ALow = 0x08
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// ldi r17, OCR0AHigh //; Sets the output compare register value
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//ldi r16, OCR0ALow
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//this asm doesn't work (why?) //perhaps OCR0A is really just 8 bits on attiny10...?)
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////// asm volatile(
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////// "ldi r17, 0x02"
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////// "ldi r16, 0x08"
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////// "out OCR0AH, r17"
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////// "out OCR0AL, r16"
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////// );
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//this asm works
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// asm volatile("nop\n\t"
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//"nop\n\t"
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//"nop\n\t"
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//"nop\n\t"
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//::);
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////////
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//////// TIMSK0 |= _BV(OCIE0A); // enable Timer CTC interrupt
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////////
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// PB2 change to output
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DDRB = 1<<2;
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//// sei();
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int x = 0;
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while(1)
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{
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//this goes about 60.3KHz.
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//experiment FAIL
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//will just buy a 6KHz oscillator.
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PINB = 1<<2;
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//EDIT: disabled optimization in mplab (level 0)
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//and ended up geting much slower IO
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//asm("nop;");
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//for(x=0;x<2;x++){
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// asm("nop;""nop;""nop;""nop;""nop;"
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//"nop;""nop;"//"nop;""nop;"//"nop;""nop;"
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// );
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//}//just this asm block is about 121.22KHz
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}
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}
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