Detailed Description

Example description
This example shows how to use I2C as master or slave and communicate between Master and Slave with polling/interrupt mode. (Interrupt mode is default)

After setting up connection, run the example in both the boards. At regular intervals both the boards will send data as master and receive data from master hence blinking the LED at regular intervals (Both boards will act as master as well as slave).

If you have UART connected define DEBUG_ENABLE in sys_config.h, and can interactively use the example to access I2C data for more information see LPC18xx/43xx I2C example

Special connection requirements

User needs 2 boards and must setup the following connection between them
Connect PIO0_5(SDA) of both the boards with a wire
Connect PIO0_4(SCL) of both boards with a wire
Connect J6-PIN1(GND) of both boards with a wire
Pull up SDA & SCL using two 10K resistors between SDA,SCL and J6-PIN28(3v3)

Build procedures:
LPC11xx example quickstart for Code Red Xpresso
LPC11xx example quickstart for Keil uVision4
LPC11xx example quickstart for IAR EWARM

Supported boards and board setup:
NXP Xpresso LPC11U14 board
NXP Xpresso LPC11C24 board

Submitting LPCOpen issues:
Community support for LPCOpen

Macros
#define	DEFAULT_I2C I2C0

#define	I2C_EEPROM_BUS DEFAULT_I2C

#define	I2C_IOX_BUS DEFAULT_I2C

#define	SPEED_100KHZ 100000

#define	SPEED_400KHZ 400000

#define	I2C_SLAVE_EEPROM_SIZE 64

#define	I2C_SLAVE_EEPROM_ADDR 0x5A

#define	I2C_SLAVE_IOX_ADDR 0x5B

Functions
static void	i2c_state_handling (I2C_ID_T id)

static void	con_print_data (const uint8_t *dat, int sz)

static int	con_get_input (const char *str)

static void	i2c_rw_input (I2C_XFER_T *xfer, int ops)

static void	i2c_set_mode (I2C_ID_T id, int polling)

static void	i2c_app_init (I2C_ID_T id, int speed)

static void	i2c_probe_slaves (I2C_ID_T i2c)

static int	i2c_menu (void)

static void	i2c_eeprom_update_state (I2C_XFER_T xfer, uint8_t buff, int sz)

static void	i2c_eeprom_events (I2C_ID_T id, I2C_EVENT_T event)

static void	i2c_eeprom_init (I2C_ID_T id)

void	i2c_iox_update_regs (int ops)

static void	i2c_iox_events (I2C_ID_T id, I2C_EVENT_T event)

static void	i2c_iox_init (I2C_ID_T id)

void	SysTick_Handler (void)
	SysTick Interrupt Handler.

void	I2C_IRQHandler (void)
	I2C Interrupt Handler.

int	main (void)
	Main program body.

Variables
static int	mode_poll

static I2C_ID_T	i2cDev = DEFAULT_I2C

static I2C_XFER_T	seep_xfer

static I2C_XFER_T	iox_xfer

static uint8_t	seep_data [I2C_SLAVE_EEPROM_SIZE+1]

static uint8_t	buffer [2][256]

static uint8_t	iox_data [2]

static volatile uint32_t	tick_cnt

Macro Definition Documentation

#define DEFAULT_I2C I2C0

Definition at line 75 of file i2c.c.

#define I2C_EEPROM_BUS DEFAULT_I2C

Definition at line 77 of file i2c.c.

#define I2C_IOX_BUS DEFAULT_I2C

Definition at line 78 of file i2c.c.

#define I2C_SLAVE_EEPROM_ADDR 0x5A

Definition at line 100 of file i2c.c.

#define I2C_SLAVE_EEPROM_SIZE 64

Definition at line 99 of file i2c.c.

#define I2C_SLAVE_IOX_ADDR 0x5B

Definition at line 101 of file i2c.c.

#define SPEED_100KHZ 100000

Definition at line 80 of file i2c.c.

#define SPEED_400KHZ 400000

Definition at line 81 of file i2c.c.

Function Documentation

static int con_get_input ( const char * str )

static

Definition at line 144 of file i2c.c.

static void con_print_data	(	const uint8_t *	dat,
		int	sz
	)

static

Definition at line 132 of file i2c.c.

static void i2c_app_init	(	I2C_ID_T	id,
		int	speed
	)

static

Definition at line 247 of file i2c.c.

static void i2c_eeprom_events	(	I2C_ID_T	id,
		I2C_EVENT_T	event
	)

static

Definition at line 297 of file i2c.c.

static void i2c_eeprom_init ( I2C_ID_T id )

static

Definition at line 332 of file i2c.c.

static void i2c_eeprom_update_state	(	I2C_XFER_T *	xfer,
		uint8_t *	buff,
		int	sz
	)

static

Definition at line 290 of file i2c.c.

static void i2c_iox_events	(	I2C_ID_T	id,
		I2C_EVENT_T	event
	)

static

Definition at line 360 of file i2c.c.

static void i2c_iox_init ( I2C_ID_T id )

static

Definition at line 386 of file i2c.c.

void i2c_iox_update_regs ( int ops )

Definition at line 343 of file i2c.c.

void I2C_IRQHandler ( void )

I2C Interrupt Handler.

Returns: None

Definition at line 419 of file i2c.c.

static int i2c_menu ( void )

static

Definition at line 283 of file i2c.c.

static void i2c_probe_slaves ( I2C_ID_T i2c )

static

Definition at line 260 of file i2c.c.

static void i2c_rw_input	(	I2C_XFER_T *	xfer,
		int	ops
	)

static

Definition at line 201 of file i2c.c.

static void i2c_set_mode	(	I2C_ID_T	id,
		int	polling
	)

static

Definition at line 233 of file i2c.c.

static void i2c_state_handling ( I2C_ID_T id )

static

Definition at line 122 of file i2c.c.

int main ( void )

Main program body.

Returns: int

defined(CHIP_LPC175X_6X)

Definition at line 428 of file i2c.c.

void SysTick_Handler ( void )

SysTick Interrupt Handler.

SysTick 1mS tick handler.

Returns: Nothing

Note: Systick interrupt handler updates the button status

Definition at line 409 of file i2c.c.

Variable Documentation

uint8_t buffer[2][256]

static

Definition at line 109 of file i2c.c.

I2C_ID_T i2cDev = DEFAULT_I2C

static

Definition at line 96 of file i2c.c.

uint8_t iox_data[2]

static

Definition at line 110 of file i2c.c.

I2C_XFER_T iox_xfer

static

Definition at line 105 of file i2c.c.

int mode_poll

static

Definition at line 95 of file i2c.c.

uint8_t seep_data[I2C_SLAVE_EEPROM_SIZE+1]

static

Definition at line 108 of file i2c.c.

I2C_XFER_T seep_xfer

static

Definition at line 104 of file i2c.c.

volatile uint32_t tick_cnt

static

Definition at line 111 of file i2c.c.

Detailed Description

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation