LPC11u68 I2C driver initialization..

lpcware — Wed, 15 Jun 2016 23:16:46 GMT

Content originally posted in LPCWare by sunilforu@gmail.com on Tue Aug 05 19:32:18 MST 2014
Hi,
I am new to LPC firmware programming.
I am using LPC11u68 Xpresso Board.I have connected two pins.

PIO0_4 --SCL
PIO0_5--SDA. to my I2C salve device and trying to read the data through
API Chip_I2C_MasterTransfer() but I see no activity on the probe and also its always
stuck at Chip_I2C_EventHandler()

When used as GPIO I can see some activity on the probe but as IO pin no activity on the bus

I want someone to

1. Verify(if something is missing) or provide the the I2C initialization required.

Chip_I2C_Init(I2C0);
Chip_I2C_SetClockRate(I2C0, 100000);
Chip_I2C_SetMasterEventHandler(I2C0, Chip_I2C_EventHandler);
NVIC_EnableIRQ(I2C0_IRQn);

2. Do I have set/change in the board_sysinit.c some MUX configuration for pin 4 and 5.

Any sample implementation for I2C salve device is highly appreciated.

Regards
Sunil

Re: LPC11u68 I2C driver initialization..

lpcware — Wed, 15 Jun 2016 23:16:47 GMT

Content originally posted in LPCWare by serge on Tue Aug 12 13:59:07 MST 2014
Just a guess: PIO0_4 and PIO0_5 are open drain pins.
I don't know the schematics of your board but are there pull-up resistors on the board? Just checked and there are two 2k2 resistors on the board.
Is your IOCON register ok?

LPCXpresso IDE中的主题 LPC11u68 I2C driver initialization..

LPC11u68 I2C driver initialization..

Re: LPC11u68 I2C driver initialization..