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Imported changes from example branch

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This commit is contained in:
BlackMark 2017-12-17 10:55:25 +01:00
parent 8e2e18128b
commit 22a74d0b77
2 changed files with 3 additions and 5 deletions
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2
twi-lowlevel.cpp
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@ -79,7 +79,7 @@ void twi_init(void)
// initialize twi prescaler and bit rate // initialize twi prescaler and bit rate
cbi(TWSR, TWPS0); cbi(TWSR, TWPS0);
cbi(TWSR, TWPS1); 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 /* twi bit rate formula from atmega128 manual pg 204
SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR)) SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))

6
twi-lowlevel.h
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@ -22,11 +22,9 @@
#include <inttypes.h> #include <inttypes.h>
//#define ATMEGA8 #include "../clock.h"
#ifndef CPU_FREQ //#define ATMEGA8
#define CPU_FREQ 16000000L
#endif
#ifndef TWI_FREQ #ifndef TWI_FREQ
#define TWI_FREQ 100000L #define TWI_FREQ 100000L