diff options
Diffstat (limited to 'ao-bringup-avr/ao-uart.c')
| -rw-r--r-- | ao-bringup-avr/ao-uart.c | 114 | 
1 files changed, 3 insertions, 111 deletions
diff --git a/ao-bringup-avr/ao-uart.c b/ao-bringup-avr/ao-uart.c index 3c290c1a..611ded9a 100644 --- a/ao-bringup-avr/ao-uart.c +++ b/ao-bringup-avr/ao-uart.c @@ -15,121 +15,13 @@   * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.   */ -#include <avr/io.h> -#include <avr/interrupt.h> -#define TEENSY 1 -#if TEENSY -#define F_CPU 16000000UL	// 16 MHz -#else -#define F_CPU  8000000UL	// 8 MHz -#endif -#include <util/delay.h> - -#define LEDOUT		PORTB7 -#define LEDPORT		PORTB -#define LEDDDR		DDRB -#define LEDDDRPIN	DD7 - -static void -timer1_init(void) -{ -	TCCR1A = ((0 << WGM11) |	/* CTC mode, OCR1A */ -		  (0 << WGM10));	/* CTC mode, OCR1A */ -	TCCR1B = ((0 << ICNC1) |	/* no input capture noise canceler */ -		  (0 << ICES1) |	/* input capture on falling edge (don't care) */ -		  (0 << WGM13) |	/* CTC mode, OCR1A */ -		  (1 << WGM12) |	/* CTC mode, OCR1A */ -		  (3 << CS10));		/* clk/64 from prescaler */ - -#if TEENSY -	OCR1A = 2500;			/* 16MHz clock */ -#else -	OCR1A = 1250;			/* 8MHz clock */ -#endif - -	TIMSK1 = (1 << OCIE1A);		/* Interrupt on compare match */ -} - -static void -clock_init(void) -{ -	/* disable RC clock */ -	CLKSEL0 &= ~(1 << RCE); - -	/* Disable PLL */ -	PLLCSR &= ~(1 << PLLE); - -	/* Enable external clock */ -	CLKSEL0 |= (1 << EXTE); - -	/* wait for external clock to be ready */ -	while ((CLKSTA & (1 << EXTON)) == 0) -		; - -	/* select external clock */ -	CLKSEL0 |= (1 << CLKS); - -	/* Disable the clock prescaler */ -	cli(); -	CLKPR = (1 << CLKPCE); -	CLKPR = 0; -	sei(); - -	/* Set up the PLL to use the crystal */ - -	/* Use primary system clock as PLL source */ -	PLLFRQ = ((0 << PINMUX) |	/* Use primary clock */ -		  (0 << PLLUSB) |	/* No divide by 2 for USB */ -		  (0 << PLLTM0) |	/* Disable high speed timer */ -		  (0x4 << PDIV0));	/* 48MHz PLL clock */ - -	/* Set the frequency of the crystal */ -#if TEENSY -	PLLCSR |= (1 << PINDIV);	/* For 16MHz crystal on Teensy board */ -#else -	PLLCSR &= ~(1 << PINDIV);	/* For 8MHz crystal on TeleScience board */ -#endif - -	/* Enable the PLL */ -	PLLCSR |= (1 << PLLE); -	while (!(PLLCSR & (1 << PLOCK))) -		; -} - -void -uart_send(char data) -{ -	while (!(UCSR1A & (1 << UDRE1))) -		; -	UDR1 = data; -} - -void -uart_init(uint16_t baud) -{ -	PRR1 &= ~(1 << PRUSART1); -	UBRR1L = baud; -	UBRR1H = baud >> 8; -	UCSR1A = 0; -	UCSR1B = ((1 << RXEN1) |	/* Enable receiver */ -		  (1 << TXEN1));	/* Enable transmitter */ -	UCSR1C = ((0 << UMSEL10) |	/* Asynchronous mode */ -		  (0 << UPM10) |	/* No parity */ -		  (0 << USBS1) |	/* 1 stop bit */ -		  (3 << UCSZ10) |	/* 8 bit characters */ -		  (0 << UCPOL1));	/* MBZ for async mode */ -} +#include "ao-bringup.h"  int main(void)  { -	clock_init(); -	timer1_init(); -	uart_init(832); - -	LEDDDR |= (1 << LEDDDRPIN); +	ao_bringup_init();  	for (;;) { -		LEDPORT ^= (1 << LEDOUT); -		uart_send('H'); +		printf("Hello, world\n");  	}  }  | 
