From 79236eaaced258e4e34619ea9210faf7e621fd8e Mon Sep 17 00:00:00 2001 From: Trygve Laugstøl Date: Mon, 2 Apr 2012 15:32:26 +0200 Subject: o Start of temperature reader. --- firmware/VirtualSerial.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) (limited to 'firmware') diff --git a/firmware/VirtualSerial.c b/firmware/VirtualSerial.c index 0fdc31c..cc06237 100644 --- a/firmware/VirtualSerial.c +++ b/firmware/VirtualSerial.c @@ -40,6 +40,8 @@ static int running = true; +void CheckACMStatus(void); + /** LUFA CDC Class driver interface configuration and state information. This structure is * passed to all CDC Class driver functions, so that multiple instances of the same class * within a device can be differentiated from one another. @@ -90,6 +92,85 @@ void lock_timer_reset(void) lock_timer_ticks = 0; } +#define LM74_SIO PD4 +#define LM74_SCL PD5 +#define LM74_CS PD3 + +/** + * Data is clocked out on the falling edge of the serial clock (SC), while data is clocked in on the rising edge of SC. + */ +void lm74_transaction(uint8_t out1, uint8_t out2, uint8_t *in1, uint8_t *in2) +{ +/* + for(int i = 0; i < 8; i++) + { + PORTD |= (out1 & 0x01) << LM74_SIO; + PORTD |= _BV(LM74_SCL); + PORTD &= ~_BV(LM74_SCL); + out1 >>= 1; + } + + for(int i = 0; i < 8; i++) + { + PORTD |= (out2 & 0x01) << LM74_SIO; + PORTD |= _BV(LM74_SCL); + PORTD &= ~_BV(LM74_SCL); + out2 >>= 1; + } +*/ +/* + for(int i = 0; i < 16; i++) + { +// PORTD |= (out2 & 0x01) << LM74_SIO; + PORTD |= _BV(LM74_SCL); + _delay_ms(10); + PORTD &= ~_BV(LM74_SCL); + _delay_ms(10); + } +*/ + uint16_t temp; + + PORTD &= ~_BV(LM74_CS); + _delay_us(100); + for(int i=0; i<16; i++) { + temp <<= 1; + PORTD |= _BV(LM74_SCL); + _delay_us(100); +// if (SIO == true) +// temp |= 1; + PORTD &= ~_BV(LM74_SCL); + _delay_us(100); + } + + PORTD |= _BV(LM74_CS); +} + +void lm74_init(void) +{ + PORTD |= (1 << LM74_SCL) | (1 << LM74_CS); + + DDRD |= (1 << LM74_SCL) | (1 << LM74_CS); + DDRD &= ~(1 << LM74_SIO); + + PORTD |= (1 << LM74_SIO); // Enable pull-up + + uint8_t d1, d2; + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); + _delay_ms(100); + lm74_transaction(0x5a, 0xa5, &d1, &d2); +} + /** Main program entry point. This routine contains the overall program flow, including initial * setup of all components and the main program loop. */ @@ -98,7 +179,11 @@ int main(void) DDRB = 1 << PB0 | 1 << PB4 | 0 << PB5; PORTB = 0 << PB0; + // Disables pull-ups + PORTD = 0; + SetupHardware(); + lm74_init(); lock_timer_setup(); @@ -183,6 +268,14 @@ void handle_command(const char *buf) PORTB &= ~(1 << PB4); PORTB &= ~(1 << PB0); } + + else if (strcmp("temp", buf) == 0) + { + uint8_t data = 0x5a; + + uint8_t d1, d2; + lm74_transaction(0x5a, 0xa5, &d1, &d2); + } } void CheckACMStatus() -- cgit v1.2.3