topic Re: I2C1 on K64F - not working in Kinetis Microcontrollers

I2C1 on K64F - not working

davidatkins — Sun, 04 Mar 2018 13:49:58 GMT

Tryignt o sue the I2C1 port of a K64F, have been able to toggle the pins using GPIO mode to prove that they are connected,

When I try and use the standrad library code it gets stuck at waiting for the followign code

while (!(base->S & kI2C_IntPendingFlag))
{
}

both SCL and SDA remain high which suggest that its not driving the I2C lines onto the pins, trying to use PTC10/11 pins.

the config tool generatyed the followign code for the pins
/* PORTC10 (pin 82) is configured as I2C1_SCL */
PORT_SetPinMux(PORTC, 10U, kPORT_MuxAlt5);

PORTC->PCR[10] = ((PORTC->PCR[10] &
/* Mask bits to zero which are setting */
(~(PORT_PCR_PS_MASK | PORT_PCR_PE_MASK | PORT_PCR_ODE_MASK | PORT_PCR_ISF_MASK)))

/* Pull Select: Internal pullup resistor is enabled on the corresponding pin, if the
* corresponding PE field is set. */
| (uint32_t)(kPORT_PullUp)

/* Open Drain Enable: Open drain output is enabled on the corresponding pin, if the pin is
* configured as a digital output. */
| PORT_PCR_ODE(kPORT_OpenDrainEnable));

/* PORTC11 (pin 83) is configured as I2C1_SDA */
PORT_SetPinMux(PORTC, 11U, kPORT_MuxAlt5);

PORTC->PCR[11] = ((PORTC->PCR[11] &
/* Mask bits to zero which are setting */
(~(PORT_PCR_PS_MASK | PORT_PCR_PE_MASK | PORT_PCR_ODE_MASK | PORT_PCR_ISF_MASK)))

/* Pull Select: Internal pullup resistor is enabled on the corresponding pin, if the
* corresponding PE field is set. */
| (uint32_t)(kPORT_PullUp)

/* Open Drain Enable: Open drain output is enabled on the corresponding pin, if the pin is
* configured as a digital output. */
| PORT_PCR_ODE(kPORT_OpenDrainEnable));

Any ideas?

David

Re: I2C1 on K64F - not working

davidatkins — Sun, 04 Mar 2018 16:40:43 GMT

It seems that the PORTC I2C1 pins are configured as muxalt2 not muxalt5, this is from looking at the outptu of the config tool, nto sure which is correct now.

Re: I2C1 on K64F - not working

Robin_Shen — Mon, 05 Mar 2018 06:50:05 GMT

Hi david,

Would you please tell us which MCUXpresso Config Tools are you using?

I am using online and offline MCUXpresso Config Tools, both of them can generate correct codes.

PORT_SetPinMux(PORTC, 11U, kPORT_MuxAlt2);

The i2c interrupt in SDK_2.3.0_FRDM-K64F also generate correct codes.

Best Regards,

Robin

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Re: I2C1 on K64F - not working

davidatkins — Mon, 05 Mar 2018 07:25:34 GMT

Hi,

Using the offline tools, is there a working example of working I2C1 port anywhere, I’m sure it’s going to be a config issues but the config tool does not generate the same code for I2C1 as it does I2C0, the i2c init function is not crated for example.

I have implemented a GPIO bit bang i2c using the pins and that works but is slow, so the circuity looks ok just the software side I think

David

Re: I2C1 on K64F - not working

Robin_Shen — Tue, 06 Mar 2018 03:17:41 GMT

Please download the SDK_2.3.0_FRDM-K64F package refer Generating a downloadable MCUXpresso SDK v.2 package.

And then you can find the i2c interrupt example in it's folder. (For example: C:\SDK_2.3.0_FRDM-K64F\boards\frdmk64f\driver_examples\i2c\interrupt)

The example is configured 2 instances I2C , one as I2C master , another as I2C slave.

Best Regards,

Robin