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K70F120M evaluation test fail, I2C0_SCL clock pin low signal problem

Question asked by chientsai on Mar 10, 2013
Latest reply on Apr 2, 2013 by Monica Arvizu



I'm evaluating I2C function for my I2C slave device. 

And I've failed to run it from default MXQ 3.8,1 both included I2C example and on board accel sensor quick start demo

(TWR-K70F120M_QSD). As well as my 0x10(7 bit address) slave device.

All test have stuck in the first default I2C0 poll address write:


fwrite (xxx,xxx,..) API that go to "C:\Program Files\Freescale\Freescale MQX 3.8\mqx\source\io\i2c\polled\i2c_pol_ki2c.c"

line 639:


And further checked K70 board general I/O port  J5, pin3 (I2C0_SCL) by multi-meter.

There is only 0.11V low voltage that is different to 3.3 V working voltage required.

Also, double checked user_config.h I2C0 is enabled.

It has showed no response from the peer slave device.

Is it a configuration problem or a hardware de-function problem?


#define BSPCFG_ENABLE_I2C0       1

#define BSPCFG_ENABLE_II2C0      1



uint_32 _ki2c_polled_tx(...)



         while (0 == (i2c_ptr->S & I2C_S_IICIF_MASK))