124 lines
2 KiB
C
124 lines
2 KiB
C
#include <inttypes.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <can.h>
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#include <messages.h>
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#include "display.h"
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#include "button.h"
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static bool report_change = false;
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static void init();
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static void send_status();
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static void loop();
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/* I/O map:
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PB2 BUTTON0
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PB3 BUTTON1
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PB4 BUTTON2
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PB5 BUTTON3
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PB6 BUTTON4
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PC0 BUTTON5
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PC1 BUTTON6
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PC2 CANTX
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PC3 CANRX
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PC4 BUTTON7
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PC5 VFDRS
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PC6 VFDRW
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PC7 VFDE
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PD0 VFDDB0
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PD1 VFDDB1
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PD2 VFDDB2
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PD3 VFDDB3
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PD4 VFDDB4
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PD5 VFDDB5
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PD6 VFDDB6
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PD7 VFDDB7
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*/
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static void init() {
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// initialize buttons
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button_init();
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// initialize VFD
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display_init();
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// Initialize CAN interface
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can_init(BITRATE_125_KBPS);
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// Regular receive/transmit mode
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can_set_mode(NORMAL_MODE);
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// Filter for messages addressed to us (RTR on)
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can_filter_t us = {
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.id = CAN_HOSTID_DISPLAY,
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.mask = CAN_HOSTID_MASK,
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.flags = {
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.rtr = 1,
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.extended = 0,
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},
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};
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can_set_filter(0, &us);
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// Filter for public messages (RTR off)
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can_filter_t pub = {
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.id = CAN_HOSTID_BROADCAST,
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.mask = CAN_HOSTID_MASK,
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.flags = {
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.rtr = 0,
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.extended = 0,
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},
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};
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can_set_filter(1, &pub);
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// Enable interrupts to start reception
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sei();
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}
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static void send_status() {
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uint8_t status = button_get();
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if (can_check_free_buffer()) {
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can_t msg = {
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.id = CAN_MSG_DISPLAY_STATUS,
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.flags = {
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.rtr = 0,
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},
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.length = 1,
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.data = { (uint8_t) status, },
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};
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can_send_message(&msg);
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}
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}
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static void loop() {
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// Check for new messages
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if (can_check_message()) {
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can_t msg = { 0 };
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uint8_t status = can_get_message(&msg);
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if (status != 0) {
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switch (msg.id) {
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case CAN_MSG_DISPLAY_STATUS:
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send_status();
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break;
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case CAN_MSG_DISPLAY_CMD:
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if (msg.length >= 1) {
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display_write(msg.data[0], &msg.data[1], msg.length - 1);
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}
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break;
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case CAN_MSG_AUTO_STATUS:
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if (msg.length == 1) {
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report_change = msg.data[0] ? true : false;
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}
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break;
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}
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}
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}
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}
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int main() {
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init();
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while (1) {
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loop();
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}
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}
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