working code (small crashes in communication still)
This commit is contained in:
Julian Daube
parent
b7d4cbaa27
commit
8ea404c3fa
@ -1 +1 @@
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Subproject commit 3141a62e62012dee60192e6ad1c95ee5b63fc8ce
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Subproject commit 362c65440c49e09e06e89299d51a25003e9724a0
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@ -12,56 +12,25 @@
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#include <avr/interrupt.h>
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// global adc instance
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volatile adc_t adc;
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static inline void adc_next() {
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do {
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adc.current_channel = (adc.current_channel+1)%8;
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if (!adc.current_channel) {
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adc.current_sample = adc.buffer.ptr-1;
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}
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} while(!(adc.channel_mask & (1<<adc.current_channel)));
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if (adc.current_sample < (adc.buffer.ptr + adc.buffer.size)) {
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adc.current_sample++;
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}
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// set mux input
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ADMUX = adc.current_channel;
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}
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adc_t adc;
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/* adc driver */
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void adc_init(adc_buffer_t buffer, uint8_t mask) {
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if (!mask) {
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return;
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}
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adc.buffer = buffer;
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adc.current_sample = adc.buffer.ptr;
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adc.channel_mask = mask;
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void adc_init(uint8_t * channels) {
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adc.current_channel = 0;
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adc.channel_map = channels;
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// find first channel
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while(!((1<<adc.current_channel) & mask)) {
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adc.current_channel++;
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ADMUX = channels[0];
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ADCSRA = (1<<ADATE) | (1<<ADEN) | 7; // enable adc, maximum prescaler value
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}
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ADMUX = 0;
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ADCSRA = (1<<ADATE) | (1<<ADEN) | 5 ; // enable adc, maximum prescaler value
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}
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void adc_start() {
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ADCSRA |= (1<<ADIE) | (1<<ADSC); // enable adc interrupt
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}
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void adc_stop( ){
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ADCSRA &= ~(1<<ADIE);
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}
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#include "led.h"
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ISR(ADC_vect) {
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**adc.current_sample = ADC;
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adc_next();
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adc.buffer[adc.current_channel] = ADC;
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adc.current_channel++;
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if (adc.current_channel == ADC_BUFFER_SIZE) {
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adc.current_channel = 0;
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}
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ADMUX = adc.channel_map[adc.current_channel];
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}
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@ -12,38 +12,25 @@
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typedef uint16_t adc_sample_t;
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#define ADC_BUFFER_SIZE 5
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typedef struct {
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adc_sample_t ** ptr;
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uint8_t size;
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} adc_buffer_t;
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typedef struct adc {
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adc_buffer_t buffer;
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adc_sample_t buffer[ADC_BUFFER_SIZE];
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uint8_t current_channel;
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adc_sample_t ** current_sample;
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uint8_t channel_mask;
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volatile uint8_t current_channel;
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uint8_t * channel_map;
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} adc_t;
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// the adc instance
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extern volatile adc_t adc;
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extern adc_t adc;
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enum {
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ADC_CHANNEL_0 = 0x01,
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ADC_CHANNEL_1 = 0x02,
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ADC_CHANNEL_2 = 0x04,
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ADC_CHANNEL_3 = 0x08,
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ADC_CHANNEL_4 = 0x10,
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ADC_CHANNEL_5 = 0x20,
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ADC_CHANNEL_6 = 0x40,
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ADC_CHANNEL_7 = 0x80,
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ADC_CHANNEL_ALL = 0xFF,
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};
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void adc_init(uint8_t * channels);
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void adc_init(adc_buffer_t buffer, uint8_t channel_mask);
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void adc_start();
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void adc_stop();
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#define adc_start() ADCSRA |= (1<<ADIE) | (1<<ADSC)
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#define adc_stop() ADCSRA &= ~(1<<ADIE)
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#endif /* ADC_H_ */
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@ -15,17 +15,17 @@
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#define LED_REG PORTB
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#define LED_PIN 0
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static inline void led_toggle() {
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LED_REG ^= (1<<LED_PIN);
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}
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#define led_toggle() do { \
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LED_REG ^= (1<<LED_PIN); \
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} while(0)
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static inline void led_off() {
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LED_REG |= (1<<LED_PIN);
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}
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#define led_off() do { \
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LED_REG |= (1<<LED_PIN); \
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} while(0)
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static inline void led_on() {
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LED_REG &= ~(1<<LED_PIN);
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}
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#define led_on() do { \
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LED_REG &= ~(1<<LED_PIN); \
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} while(0)
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void led_init();
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@ -12,106 +12,19 @@
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#include <interface.h>
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typedef struct {
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byte_t * buffer_start, * buffer_end;
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volatile byte_t * read;
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volatile byte_t * write;
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volatile byte_t count;
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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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if ((comm.write == comm.read) && comm.count) {
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// write overflow
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return;
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}
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*comm.write = byte;
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++comm.count;
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// advance write pointer
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if ((++comm.write) >= comm.buffer_end) {
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comm.write = comm.buffer_start;
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}
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}
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inline byte_t comm_read() {
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if (!comm.count)
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return 0x00;
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byte_t result = *comm.read;
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--comm.count;
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if ((++comm.read) >= comm.buffer_end) {
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comm.read = comm.buffer_start;
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}
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return result;
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}
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byte_t comm_buffer[10];
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void comm_init()
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{
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comm.buffer_start = comm_buffer;
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comm.buffer_end = comm_buffer + sizeof(comm_buffer);
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// reset buffer
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comm.write = comm.buffer_start;
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comm.read = comm.buffer_start;
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comm.count = 0;
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// TODO: setup pins
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DDRA |= (1<<PA5); // setup MOSI as output
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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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comm.iface.on_read = 0;
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}
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void comm_start()
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{
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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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{
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cli();
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// write buffer out if there is data to be written
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//if (!comm.count) {
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// call interrupt handler
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//comm.iface.on_read(&comm.iface, USIDR, comm.iface.callback_data);
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//}
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USIDR = 0x02;
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sei();
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//USIDR = comm_read();
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}
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#include "main.h"
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void comm_init();
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// the public instance of the app buffer
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struct app app = {};
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adc_sample_t * channel_map[] = {
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// update app state (remap channels)
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&app.state.state.poti[2],
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&app.state.state.poti[3],
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&app.state.state.poti[1],
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&app.state.state.poti[0],
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&app.state.state.slider
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uint8_t channel_map[ADC_BUFFER_SIZE] = {
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0,
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1,
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2,
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3,
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7
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};
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// initalizes the application modules
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@ -124,25 +37,80 @@ void 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 = channel_map,
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.size = sizeof(channel_map),
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}, 0x8F);
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adc_init(channel_map);
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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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void comm_init()
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{
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DDRA |= (1<<PA5); // setup MOSI as output
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USICR = (1<<USIWM0)|(1<<USICS1);
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}
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volatile enum {
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COMM_WAIT = 0,
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COMM_SEND_START ,
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COMM_SEND_WAIT ,
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COMM_SEND_END ,
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} comm_state;
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static inline void comm_service()
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{
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static uint8_t count = 0;
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static uint16_t temp = 0xFF;
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if (USISR & (1<<USIOIF))
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{
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led_on();
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cli();
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switch(comm_state)
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{
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case COMM_WAIT:
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if (IS_EOM(USIDR)) {
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// pass package through
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USIDR &= ~0x80;
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comm_state = COMM_SEND_START;
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adc_stop();
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}
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break;
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case COMM_SEND_START:
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temp = adc.buffer[count];
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USIDR = temp & 0x7F;
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comm_state = COMM_SEND_WAIT;
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break;
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case COMM_SEND_WAIT:
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USIDR = (temp>>7)&0x7F;
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if (++count == ADC_BUFFER_SIZE) {
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comm_state = COMM_SEND_END;
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} else {
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comm_state = COMM_SEND_START;
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}
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break;
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case COMM_SEND_END:
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count = 0;
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USIDR = app.state.state.button | 0x80;
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default:
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comm_state = COMM_WAIT;
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adc_start();
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break;
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}
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USISR |= (1<<USIOIF);
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sei();
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led_off();
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}
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}
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#include <util/delay.h>
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// little debug helper function
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@ -160,6 +128,8 @@ int main()
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init();
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while(1) {
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// nothing to do here, the application is interrupt-driven
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// service serial interface
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// slightly more stable then interrupt
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comm_service();
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}
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}
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