WebSVN - Projects - Blame - Rev 778 - /Spektrum-Diversity/Software/diversity.c

Rev	Author	Line No.	Line
778	-	1	// *************************************************************
		2	// Spektrum Diversity - use up to 4 satellite receivers
		3	// *************************************************************
		4	// Target: An Atmel ATtiny2313 (RC-Oscillator @ 8 MHz)
		5	// controls a 74HC151 Multiplexer
		6	// *************************************************************
		7	// It monitors the data from 4 satellite receivers and
		8	// connects a valid one to the output via the multiplexer
		9	// *************************************************************
		10	// LED-Modes during startup (in chronological order)
		11	// ********************
		12	// LED fast blink: Waiting for first datapulse
		13	// LED slow blink: Waiting 3 seconds while counting sat's
		14	// LED flashes: Indicates the number of active sat's
		15	//
		16	// LED-Modes during operation
		17	// **********************
		18	// LED OFF: Everything is fine
		19	// LED ON: FAILURE - The first selected sat had lost sync
		20	//
		21	// LED-Modes during Self-Test
		22	// **********************
		23	// LED flashes at 1 Hz: Everything is fine
		24	// LED flashes some times: FAILURE
		25	// *************************************************************
		26	// (c) 2010-0xFFFF Stefan Pendsa
		27	// License: don't know - use it and have fun
		28	// *************************************************************
775	-	29
		30	#include <avr/io.h>
		31	#include <avr/interrupt.h>
		32	#include <util/delay.h>
		33
776	-	34	#define LED_OFF PORTD \|= 1 << PORTD0
		35	#define LED_ON PORTD &= ~(1 << PORTD0)
775	-	36
		37	volatile unsigned int TimerEvent;
		38
		39
778	-	40
		41	ISR(TIMER1_OVF_vect) // Triggered every 8,192 msec
		42	{
		43	TimerEvent++;
		44	}
		45
		46
		47
775	-	48	void SelectSat(unsigned char sat)
		49	{
776	-	50	PORTD = (PORTD & 0b00000001) \| (sat<<3); // Select the Input for 74HC151
775	-	51	}
		52
778	-	53
		54
775	-	55	void ResetTimer(void)
		56	{
		57	TCNT1H = 0;
		58	TCNT1L = 0;
		59	TimerEvent = 0;
		60	}
		61
		62
778	-	63
776	-	64	void Binding(void) // Binding sequence for DX7
		65	{
		66	unsigned char i = 0;
775	-	67
776	-	68	DDRB = 0b11110000; // Sat-Pins to output
		69	_delay_ms(80); // Let them boot up
		70
		71	for (i=0;i<3;i++) // send three negative 100�s pulses to all sat's
		72	{
		73	PORTB = 0b00000000;
		74	_delay_us(100);
		75	PORTB = 0b11110000;
		76	_delay_us(100);
		77	}
		78
		79	_delay_ms(1000);
		80	DDRB = 0b00000000; // Sat-Pins to input after 1sec
		81	}
		82
		83
778	-	84
776	-	85	void Testing(void) // Self Test
775	-	86	{
778	-	87	unsigned char error = 0;
776	-	88	unsigned char i = 0;
		89
778	-	90	DDRB = 0b11110000; // Port B Output for satellites, Input for feedback
776	-	91
778	-	92	PORTB = 0b01010000; // Test Pattern
		93	SelectSat(0);
		94	if (!(PINB & (1<<PB3))) error++;
		95	SelectSat(1);
		96	if (PINB & (1<<PB3)) error++;
		97	SelectSat(2);
		98	if (!(PINB & (1<<PB3))) error++;
		99	SelectSat(3);
		100	if (PINB & (1<<PB3)) error++;
776	-	101
778	-	102	PORTB = 0b10100000; // Another (inverted) Test Pattern
		103	SelectSat(0);
		104	if (PINB & (1<<PB3)) error++;
		105	SelectSat(1);
		106	if (!(PINB & (1<<PB3))) error++;
		107	SelectSat(2);
		108	if (PINB & (1<<PB3)) error++;
		109	SelectSat(3);
		110	if (!(PINB & (1<<PB3))) error++;
		111
		112	DDRB = 0b00000000; // Port B Input again
		113
776	-	114	while(1) // Never return
		115	{
778	-	116	if (error == 0) // When no error occured -> LED flashes at 1 Hz
776	-	117	{
		118	LED_ON;
		119	_delay_ms(100);
		120	LED_OFF;
778	-	121	_delay_ms(900);
776	-	122	}
778	-	123	else
		124	{
		125	for (i=0;i<error;i++) // When error occured -> Flash once for every error
		126	{
		127	LED_ON;
		128	_delay_ms(100);
		129	LED_OFF;
		130	_delay_ms(400);
		131	}
		132	_delay_ms(1000);
		133	}
		134
776	-	135	}
778	-	136
776	-	137	}
		138
		139
775	-	140
		141	int main(void)
		142	{
		143	unsigned char i = 0;
776	-	144	unsigned char j = 0;
		145	unsigned char active[4];
		146	unsigned char sat = 4;
775	-	147
778	-	148	DDRB = 0b00000000; // Port B Input for satellites and feedback
		149	DDRD = 0b0011001; // Port D Output for MUX and LED, Input for Switch & Test
		150	PORTB = 0b11110000; // Port B Pullup's for (unused) satellites
		151	PORTD = 0b1100001; // Port D Pullup's for Switch & Test, LED on
775	-	152
776	-	153	for (i=0;i<4;i++) active[i] = 0; // Reset active-array
		154
778	-	155	if (!(PIND & (1<<PD5))) Testing(); // Initiate Self-Test when Test-Pad is low
776	-	156	if (!(PIND & (1<<PD6))) Binding(); // Initiate Binding when Bind-Button is pressed
		157
		158	TCCR1B = ( 1 << CS10 ); // Timer1 Prescaler = 1 -> 8,192 msec
775	-	159	TIMSK = ( 1 << TOIE1 ); // Timer1 Overflow Interrupt Enable
		160	sei(); // Global Interrupts enable
		161
		162	ResetTimer();
776	-	163	while((PINB & 0b11110000) == 0b11110000) // Wait for first signal (SYNC to frame)
775	-	164	{
		165	if (TimerEvent == 10) LED_ON; // Blink while waiting...
		166	if (TimerEvent == 20)
		167	{
		168	LED_OFF;
		169	TimerEvent = 0;
		170	}
		171	}
		172	LED_OFF;
		173
		174	ResetTimer();
778	-	175	while(1) // Check active satellites for 5 seconds
775	-	176	{
		177	if (TimerEvent == 20) LED_ON; // Blink (slower) while waiting...
		178	if (TimerEvent == 40)
		179	{
		180	LED_OFF;
		181	TimerEvent = 0;
		182	j++;
		183	}
		184
776	-	185	for (i=0;i<4;i++)
775	-	186	{
776	-	187	if (!(PINB & (1<<(i+4))))
775	-	188	{
		189	active[i] = 1;
776	-	190	if (sat == 4) // Select first active satellite (only once)
775	-	191	{
		192	sat = i;
		193	SelectSat(i);
		194	}
		195
		196	}
		197	}
		198
778	-	199	if (j == 16) break; // 16 * 40 * 8ms = ~5sec
775	-	200	}
		201
		202	LED_OFF;
		203	_delay_ms(1000);
		204
776	-	205	for (i=0;i<4;i++) // Flash once for every active satellite
775	-	206	{
		207	if (active[i] == 1)
		208	{
		209	LED_ON;
776	-	210	_delay_ms(100);
775	-	211	LED_OFF;
778	-	212	_delay_ms(400);
775	-	213	}
		214	}
		215
		216
		217
		218
		219	while(1) // Main-Loop
		220	{
778	-	221	for (i=0;i<4;i++) active[i] = 0; // Reset active-array
		222
775	-	223	ResetTimer();
776	-	224	while((PINB & 0b11110000) == 0b11110000) // Wait for first signal (SYNC to frame)
775	-	225	{
		226	if (TimerEvent > 3) break; // (max. 3*8=24ms)
		227	}
		228
		229	ResetTimer();
		230	while(TimerEvent < 1) // Check active satellites (for 1*8=8ms)
		231	{
		232
776	-	233	for (i=0;i<4;i++)
775	-	234	{
776	-	235	if (!(PINB & (1<<(i+4))))
775	-	236	{
		237	active[i] = 1;
		238	}
		239	}
		240	}
		241
		242	if (active[sat] == 0) // Detect fail on active satellite
		243	{
778	-	244	LED_ON; // Failure-LED ON
776	-	245	for (i=0;i<4;i++) // Select lowest active satellite
775	-	246	{
		247	if (active[i] == 1)
		248	{
		249	sat = i;
		250	SelectSat(sat);
		251	break;
		252	}
		253	}
		254	}
776	-	255
778	-	256	if (!(PIND & (1<<PD6))) LED_OFF; // Reset Failure-LED when Bind-Button is pressed
775	-	257	}
776	-	258
775	-	259	}

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