120 lines
2.1 KiB
C
120 lines
2.1 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "adc.h"
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#include "led.h"
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#include "button.h"
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#include "main.h"
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/* Communication driver */
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#define SLAVE_ENABLE_DDR DDRA
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#define SLAVE_ENABLE_REG PINA
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#define SLAVE_ENABLE_PIN 1
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#include <interface.h>
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typedef struct {
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iface_t iface;
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} comm_t;
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comm_t comm;
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void comm_write(iface_t * iface, byte_t byte) {
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// disable interrupt (temporarily)
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uint8_t temp = USICR;
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USICR &= ~(1<<USIOIE);
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// write data register
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USIDR = byte;
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// wait for buffer overflow
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while(!(USICR&(1<<USIOIE))) {}
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// restore control register
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USICR = temp;
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}
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void comm_init() {
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// TODO: setup pins
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// TODO: setup USART in synchronous mode
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USICR = (1<<USIWM0)|(1<<USICS1);
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// init interface
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comm.iface.write = comm_write;
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}
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void comm_start() {
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// don't start without interrupt handler
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if (!comm.iface.on_read)
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return;
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// TODO: activate USART
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USICR |= (1<<USIOIE);
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}
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ISR(USI_OVF_vect) {
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// call interrupt handler
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comm.iface.on_read(&comm.iface, USIBR, comm.iface.callback_data);
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}
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void on_read(iface_t * sender, byte_t b) {
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if (!IS_EOM(b)) {
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sender->write(sender, b);
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return;
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}
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// strip EOM message
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sender->write(sender, b&0x7F);
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}
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#include "main.h"
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// the public instance of the app buffer
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struct app app = {};
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// initalizes the application modules
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void init() {
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// init button module (making the button light up on press)
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// module also updates app.buffer.button for us
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button_init();
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// init adc module
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// will sample 0x8F (CHANNEL 8 and 0-3)
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// this module also updates app.buffer.poti and slider for us
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adc_init((adc_buffer_t){
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.ptr = app.adc_buffer,
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.size = 5,
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}, 0x8F);
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// init communication module
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comm_init();
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// bind state encoder to communication module
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slave_init(&app.state, &comm.iface);
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// start all modules
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adc_start();
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comm_start();
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// activate interrupts (effectivly starting the application)
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sei();
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}
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// little debug helper function
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// FIXME: remove when not needed
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void delay(uint16_t d) {
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while(d--) {
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__asm("nop");
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}
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}
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int main() {
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init();
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// start relevant periphials
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adc_start();
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while(1) {
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// nothing to do here, the application is interrupt-driven
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}
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}
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