From f6972a43581b24281b322a6f8d2bf02dafbe4433 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Thu, 16 Aug 2018 12:58:24 +0200
Subject: [PATCH] configurable i2c bitrate on arduino nano
---
src/app/i2cbench/main.cc | 5 +++--
src/arch/arduino-nano/Makefile.inc | 4 ++++
src/arch/arduino-nano/driver/i2c.cc | 6 +++++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/src/app/i2cbench/main.cc b/src/app/i2cbench/main.cc
index c9c2b70..5304816 100644
--- a/src/app/i2cbench/main.cc
+++ b/src/app/i2cbench/main.cc
@@ -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();
diff --git a/src/arch/arduino-nano/Makefile.inc b/src/arch/arduino-nano/Makefile.inc
index d481fa2..18a6563 100644
--- a/src/arch/arduino-nano/Makefile.inc
+++ b/src/arch/arduino-nano/Makefile.inc
@@ -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:
diff --git a/src/arch/arduino-nano/driver/i2c.cc b/src/arch/arduino-nano/driver/i2c.cc
index cfbea59..0a2f595 100644
--- a/src/arch/arduino-nano/driver/i2c.cc
+++ b/src/arch/arduino-nano/driver/i2c.cc
@@ -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;
}
--
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