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-rwxr-xr-xdrivers/avr/i2c_master.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index 0db949db4a..ba6d0d1586 100755
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -18,6 +18,18 @@
void i2c_init(void) {
TWSR = 0; /* no prescaler */
TWBR = (uint8_t)TWBR_val;
+
+ #ifdef __AVR_ATmega32A__
+ // set pull-up resistors on I2C bus pins
+ PORTC |= 0b11;
+
+ // enable TWI (two-wire interface)
+ TWCR |= (1 << TWEN);
+
+ // enable TWI interrupt and slave address ACK
+ TWCR |= (1 << TWIE);
+ TWCR |= (1 << TWEA);
+ #endif
}
i2c_status_t i2c_start(uint8_t address, uint16_t timeout) {