I2C

Typedefs
typedef enum picoI2CPort	picoI2CPort

Enumerations
enum	picoI2CPort { I2C0, I2C1, I2C2 }

Functions
void	picoI2CInit (picoI2CPort p)
int32_t	picoI2CTransfer (picoI2CPort p, uint8_t slave_addr, uint8_t *txbuf, uint16_t txlen, uint8_t *rxbuf, uint16_t rxlen)

Detailed Description

Inter-Integrated Circuit communication API

Available signals and pins:

picoCIAA	Signal
P8_5	I2C1_SCL
P8_8	I2C1_SDA
P8_3	I2C0_SCL
P8_6	I2C0_SDA
P8_7	I2C2_SCL
P2_13	I2C2_SDA

Note

use I2C1 as default because it has external pull-ups available

Typedef Documentation

typedef enum picoI2CPort picoI2CPort

Available I2C ports

Enumeration Type Documentation

enum picoI2CPort

Available I2C ports

Enumerator
I2C0	I2C0 on pins P8_3 (SCL) and P8_6 (SDA)
I2C1	I2C1 on pins P8_5 (SCL) and P8_8 (SDA) with external pull-ups
I2C2	I2C2 on pins P8_7 (SCL) and P2_13 (SDA)

Function Documentation

void picoI2CInit

(

picoI2CPort

p

)

initialize I2C port

Parameters

p	port number, can be I2C0, I2C1 or I2C2.

Here is the call graph for this function:

int32_t picoI2CTransfer	(	picoI2CPort	p,
		uint8_t	slave_addr,
		uint8_t *	txbuf,
		uint16_t	txlen,
		uint8_t *	rxbuf,
		uint16_t	rxlen
	)

transmit and receive data to/from I2C port

Parameters

p	port number, can be I2C0, I2C1 or I2C2.
slave_addr	slave ID
txbuf	transmit data buffer
txlen	transmit data buffer length in bytes
rxbuf	receive data buffer
rxlen	receive data buffer length in bytes

Returns

0 on success, other value in case of I2C error