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Add F_CPU=0x800000 option with phase lock to external 32768 Hz crystal

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Add MCU_CONF_LOW_WEAR option to avoid eeprom writes during development.
This commit is contained in:
David Kopf 2012-01-10 12:42:27 -05:00
parent 057398a6d1
commit 58298f59db
7 changed files with 95 additions and 5 deletions
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18
cpu/avr/dev/rs232_atmega1284.h
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@ -86,9 +86,23 @@
#define USART_BAUD_230400 1
#define USART_BAUD_250000 1
#define USART_BAUD_500000 0
#elif F_CPU == 0x800000UL
/* 8192 KHz with external 32768 crystal */
#define USART_BAUD_38400 12
#define USART_BAUD_57600 8
#define USART_BAUD_115200 4
#else
#error "Please define the baud rates for your CPU clock: ATmega128 handbook p. \
195-198 or set the rate in contiki-conf.h"
/* UBRR = F_CPU/(16*BAUD) - 1 */
#warning "Unusual CPU Clock Rate!!!!"
#warning "You may have to tune the UBRR regisgers for the correct baud rates"
#warning "See ATmega128 handbook p. 195-198 or set the rate in contiki-conf.h"
#ifndef USART_BAUD_38400
#define USART_BAUD_38400 F_CPU/(16*38400) - 1
#endif
#ifndef USART_BAUD_57600
#define USART_BAUD_57600 F_CPU/(16*57600) - 1
#endif
#endif