qmsk-dmx: src/hello.c@3b837eaf1b6d (annotated)

47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	1	#include <avr/io.h>
49 f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	2
52 237d1f5c1c32 hello: split out timer; add serial Tero Marttila <terom@paivola.fi> parents: 50 diff changeset	3	#include "stdlib.h"
237d1f5c1c32 hello: split out timer; add serial Tero Marttila <terom@paivola.fi> parents: 50 diff changeset	4	#include "timer.c" // XXX
237d1f5c1c32 hello: split out timer; add serial Tero Marttila <terom@paivola.fi> parents: 50 diff changeset	5	#include "serial.c" // XXX
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	6	#include "spi.c" // XXX
47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	7
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	8	static enum state {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	9	START = '\n',
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	10	CMD_SET = 's',
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	11	ARG_CHAR = '0',
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	12	ERROR = '!',
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	13	} state = START, cmd = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	14
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	15	static enum {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	16	CMD_LED_1 = 0,
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	17	} cmd_led = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	18
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	19	static char arg_char;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	20
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	21	static unsigned char led_state = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	22
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	23	int command (enum state cmd)
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	24	{
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	25	switch (cmd) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	26	case CMD_SET:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	27	led_state = arg_char;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	28
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	29	return 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	30
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	31	default:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	32	return 1;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	33	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	34	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	35
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	36	char input (char c)
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	37	{
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	38	if (c == '\r') {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	39	char ret = '?';
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	40
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	41	// command state
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	42	switch (state) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	43	case START:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	44	cmd = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	45	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	46
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	47	case CMD_SET:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	48	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	49
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	50	case ARG_CHAR:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	51	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	52
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	53	case ERROR:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	54	cmd = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	55	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	56	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	57
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	58	// command
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	59	if (!cmd) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	60	ret = ' ';
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	61	} else if (command(cmd)) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	62	ret = '!';
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	63	} else {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	64	ret = '\n';
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	65	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	66
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	67	// return to START with response
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	68	state = START;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	69	return ret;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	70
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	71	} else if (31 < c && c < 128) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	72	// process input char
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	73	switch (state) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	74	case START:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	75	if (c == 's') {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	76	cmd = CMD_SET;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	77	state = ARG_CHAR;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	78	arg_char = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	79	return state;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	80
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	81	} else if (c == 'S') {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	82	cmd = state = CMD_SET;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	83	arg_char = 255;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	84	return state;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	85	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	86	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	87
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	88	/*
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	89	case CMD_SET:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	90	if (c == '1') {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	91	cmd_led = CMD_LED_1;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	92	state = ARG_CHAR;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	93	arg_char = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	94	} else {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	95	state = ERROR;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	96	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	97
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	98	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	99	*/
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	100	case ARG_CHAR:
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	101	if (c >= '0' && c <= '9') {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	102	arg_char *= 10;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	103	arg_char += (c - '0');
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	104
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	105	return c;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	106	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	107	break;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	108	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	109
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	110	// reject
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	111	state = ERROR;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	112	return ERROR;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	113
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	114	} else {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	115	// ignore
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	116	return ' ';
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	117	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	118	}
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	119
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	120	#define LED7_DDR DDRB
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	121	#define LED7_PORT PORTB
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	122	#define LED7_OE PORTB1
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	123
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	124	// common anode?
56 3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	125	#define LED7_ANODE 0
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	126
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	127	#define LED7_OFFSET 0
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	128	#define LED7_COUNT 2
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	129
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	130	static const uint8_t LED7SEG_FONT[] = {
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	131	0b00111111, // 0
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	132	0b00000110, // 1
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	133	0b01011011, // 2
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	134	0b01001111, // 3
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	135	0b01100110, // 4
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	136	0b01101101, // 5
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	137	0b01111101, // 6
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	138	0b00000111, // 7
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	139	0b01111111, // 8
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	140	0b01100111, // 9
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	141	0b01110111, // A
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	142	0b01111100, // B
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	143	0b00111001, // C
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	144	0b01011110, // D
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	145	0b01111001, // E
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	146	0b01110001, // F
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	147	};
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	148
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	149	enum {
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	150	LED7SEG_DOT = 0b10000000,
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	151	};
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	152
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	153	void led7_init (void)
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	154	{
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	155	sbi(&LED7_PORT, LED7_OE); // disabled (low)
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	156	sbi(&LED7_DDR, LED7_OE); // out
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	157	}
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	158
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	159	/*
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	160	* Update external IO.
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	161	*/
56 3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	162	void led7_update_raw (uint8_t *led7, char count)
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	163	{
56 3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	164	int i;
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	165
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	166	for (i = 0; i < count; i++) {
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	167	char raw = LED7SEG_FONT[led7[i]];
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	168
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	169	spi_tx[LED7_OFFSET + i] = LED7_ANODE ? ~raw : raw;
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	170	}
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	171	}
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	172
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	173	void led7_update_hex (unsigned char c)
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	174	{
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	175	uint8_t led7[2];
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	176
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	177	led7[0] = c >> 4;
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	178	led7[1] = c & 0xF;
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	179
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	180	return led7_update_raw(led7, sizeof(led7));
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	181	}
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	182
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	183	void led7_update ()
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	184	{
3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	185	static unsigned char i = 0;
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	186
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	187	if (i) {
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	188	// enable display
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	189	cbi(&LED7_PORT, LED7_OE);
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	190	}
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	191
56 3b837eaf1b6d hello: expand to two led7seg displays Tero Marttila <terom@paivola.fi> parents: 55 diff changeset	192	led7_update_hex(led_state);
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	193
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	194	i++;
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	195	}
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	196
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	197	#define DEBUG_DDR DDRB
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	198	#define DEBUG_PORT PORTB
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	199	#define DEBUG_LED 0
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	200
47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	201	int main (void)
7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	202	{
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	203	led7_init();
49 f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	204	timer_init();
52 237d1f5c1c32 hello: split out timer; add serial Tero Marttila <terom@paivola.fi> parents: 50 diff changeset	205	serial_init();
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	206	spi_init();
49 f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	207
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	208	// led_init();
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	209	sbi(&DEBUG_DDR, DEBUG_LED);
49 f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	210
f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	211	sei();
f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	212
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	213	// start
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	214	char c;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	215	unsigned short timeout = 0;
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	216
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	217	serial_write(state);
47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	218
7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	219	while (true) {
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	220	// TODO: SPI timer
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	221	led7_update();
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	222	spi_update();
04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	223
53 dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	224	// toggle
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	225	if (led_state == 0) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	226	timeout = 0;
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	227	cbi(&DEBUG_PORT, DEBUG_LED);
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	228
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	229	} else if (led_state == 255) {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	230	timeout = 0;
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	231	sbi(&DEBUG_PORT, DEBUG_LED);
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	232
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	233	} else {
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	234	// as Hz
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	235	timeout = (16000 / led_state);
55 04c625712e35 hello: trivial spi bits Tero Marttila <terom@paivola.fi> parents: 54 diff changeset	236	xbi(&DEBUG_PORT, DEBUG_LED);
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	237	}
47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	238
53 dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	239	// sleep
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	240	if (timer_sleep(timeout)) {
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	241	c = '.';
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	242
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	243	} else if ((c = serial_read())) {
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	244	// got serial data
54 ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	245	c = input(c);
ec42f36d8614 hello: interactive console Tero Marttila <terom@paivola.fi> parents: 53 diff changeset	246
53 dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	247	} else {
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	248	c = '?';
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	249	}
49 f01fb659e54d hello: timer-based sleeps Tero Marttila <terom@paivola.fi> parents: 47 diff changeset	250
53 dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	251	// output...
dfe67409fbcd hello: interruptable timer sleep, with buffered serial IO Tero Marttila <terom@paivola.fi> parents: 52 diff changeset	252	serial_write(c);
47 7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	253	}
7f930a94ee1e bravely step into the modern world of C-programming, using avr-gcc for a hello world... Tero Marttila <terom@paivola.fi> parents: diff changeset	254	}

author	Tero Marttila <terom@paivola.fi>
	Fri, 04 Apr 2014 01:04:41 +0300
changeset 56	3b837eaf1b6d
parent 55	04c625712e35
child 57	ee412c5be8b1
permissions	-rw-r--r--