Commit ed0c9e21 authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

blinkenrocket i2c: Add optional no-interrupt I2C

parent f4b31b88

src/arch/blinkenrocket/driver/i2c.cc

+9 −2
Original line number Diff line number Diff line
@@ -5,10 +5,16 @@ 


inline void await_twint(unsigned char twcr_values)

{

#if 1

	TWCR = twcr_values | _BV(TWINT) | _BV(TWIE);

	while (!(TWCR & _BV(TWINT))) {

		arch.idle();

	}

#endif

#if 0

	TWCR = twcr_values | _BV(TWINT);

	while (!(TWCR & _BV(TWINT))) ;

#endif

}



/*
@@ -21,8 +27,8 @@ static signed char i2c_start_read(unsigned char addr) 
	if (!(TWSR & 0x18)) // 0x08 == START ok, 0x10 == RESTART ok

		return -1;



	// Note: The R byte ("... | 1") causes the TWI momodule to switch to

	// Master Receive mode

	// Note: An adress with read bit set ("... | 1") causes the TWI momodule

	// to switch to Master Receive mode

	TWDR = (addr << 1) | 1;

	await_twint(_BV(TWEN));

	if (TWSR != 0x40) // 0x40 == SLA+R transmitted, ACK receveid
@@ -55,6 +61,7 @@ static signed char i2c_start_write(unsigned char addr) 
static signed char i2c_stop()

{

	TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);

	return 0;

}



/*