Commit f6972a43 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

configurable i2c bitrate on arduino nano

parent 7343085d

src/app/i2cbench/main.cc

+3 −2
Original line number Diff line number Diff line
@@ -25,8 +25,9 @@ 
void loop(void)

{

#ifdef DRIVER_LM75

	kout.printf_float(lm75.getTemp());

	kout << endl;

	//kout.printf_float(lm75.getTemp());

	//kout << endl;

	lm75.setOS(64);

#endif

#ifdef DRIVER_AM2320

	am2320.read();

src/arch/arduino-nano/Makefile.inc

+4 −0
Original line number Diff line number Diff line
@@ -32,6 +32,10 @@ ifneq ($(findstring stdin,${arch_drivers}), ) 
	TARGETS += src/arch/arduino-nano/driver/stdin.cc

endif



ifneq (${i2c_freq}, )

	COMMON_FLAGS += -DF_I2C=${i2c_freq}

endif



OBJECTS = ${TARGETS:.cc=.o}



.cc.o:

src/arch/arduino-nano/driver/i2c.cc

+5 −1
Original line number Diff line number Diff line
@@ -3,6 +3,10 @@ 
#include <avr/io.h>

#include <avr/interrupt.h>



#ifndef F_I2C

#define F_I2C 100000UL

#endif



inline void await_twint(unsigned char twcr_values)

{

	TWCR = twcr_values | _BV(TWINT) | _BV(TWIE);
@@ -99,7 +103,7 @@ static signed char i2c_receive(uint8_t len, uint8_t *data) 
signed char I2C::setup()

{

	TWSR = 0;

	TWBR = ((F_CPU / 100000UL) - 16) / 2;

	TWBR = ((F_CPU / F_I2C) - 16) / 2;



	return 0;

}