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Code Issues Releases Activity

Removing hardcoded CPU speed from Wire library.

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Replacing CPU_FREQ with F_CPU.
This commit is contained in:
David A. Mellis 2011-02-22 22:25:04 -05:00
parent 24e62aa4e7
commit e1faf02deb
2 changed files with 1 additions and 5 deletions
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2
libraries/Wire/utility/twi.c
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@ -79,7 +79,7 @@ void twi_init(void)
// initialize twi prescaler and bit rate
cbi(TWSR, TWPS0);
cbi(TWSR, TWPS1);
TWBR = ((CPU_FREQ / TWI_FREQ) - 16) / 2;
TWBR = ((F_CPU / TWI_FREQ) - 16) / 2;
/* twi bit rate formula from atmega128 manual pg 204
SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))

4
libraries/Wire/utility/twi.h
View File

@ -24,10 +24,6 @@
//#define ATMEGA8
#ifndef CPU_FREQ
#define CPU_FREQ 16000000L
#endif
#ifndef TWI_FREQ
#define TWI_FREQ 100000L
#endif