dac_adc_demo and PORTE_IDX

[inderjitjutla]

Hello, I am using a MK64FN1M0VLL12 chip and I've been trying to integrate adc measurements and i2c. I've been using the dac_adc_demo as an example but I ran into some hardware initialization issues. For i2c I need to initialize the E ports:

CLOCK_SYS_EnablePortClock(PORTE_IDX);

But when I add that to the dac_adc_demo in hardware_init.c, the i2c line stops working. I know ADC0_SE17 shares a port with the i2c line but I'm not using that adc pin (I'm using channel 3). I'm confused as to what's causing issues with enabling the clock for port e.

[kerryzhou]

Hi inderjitjutla,

  You just enable the PORTE clock, you should also choose the I2C pin as the I2C function, please refer to the I2C sample code configuration:

	/* Ungate the port clock */
	CLOCK_EnableClock(kCLOCK_PortE);
	/* I2C0 pull up resistor setting */
	PORT_SetPinConfig(PORTE, 24U, &pinConfig);
	PORT_SetPinConfig(PORTE, 25U, &pinConfig);
	/* I2C0 PIN_MUX Configuration */
	PORT_SetPinMux(PORTE, 24U, kPORT_MuxAlt5);
	PORT_SetPinMux(PORTE, 25U, kPORT_MuxAlt5);

	/* Ungate the port clock */
	CLOCK_EnableClock(kCLOCK_PortC);
	/* I2C1 pull up resistor setting */
	PORT_SetPinConfig(PORTC, 10U, &pinConfig);
	PORT_SetPinConfig(PORTC, 11U, &pinConfig);
	/* I2C1 PIN_MUX Configuration */
	PORT_SetPinMux(PORTC, 10U, kPORT_MuxAlt2);
	PORT_SetPinMux(PORTC, 11U, kPORT_MuxAlt2);

Wish it helps you!

If you still have question, please let me know!

Have a great day,
Jingjing

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[inderjitjutla]

Hello,

Thanks for the reply! I believe I'm already doing that. This is my full hardware_init.c:

/* Enable clock for PORTs */

  CLOCK_SYS_EnablePortClock(PORTA_IDX);

  CLOCK_SYS_EnablePortClock(PORTB_IDX);

  CLOCK_SYS_EnablePortClock(PORTE_IDX);

  /* Enable I2C pins */

  configure_i2c_pins(0);

  /* Init board clock */

  BOARD_ClockInit();

  dbg_uart_init();

Where the configure_i2c_pins(0) is:

void configure_i2c_pins(uint32_t instance)

{

  switch(instance) {

    case I2C0_IDX:                       /* I2C0 */

      /* Affects PORTE_PCR24 register */

      PORT_HAL_SetMuxMode(PORTE,24u,kPortMuxAlt5);

      PORT_HAL_SetOpenDrainCmd(PORTE,24u,true);

      /* Affects PORTE_PCR25 register */

      PORT_HAL_SetMuxMode(PORTE,25u,kPortMuxAlt5);

      PORT_HAL_SetOpenDrainCmd(PORTE,25u,true);

      break;

    case I2C1_IDX:                       /* I2C1 */

      /* Affects PORTC_PCR10 register */

      PORT_HAL_SetMuxMode(PORTC,10u,kPortMuxAlt2);

      PORT_HAL_SetOpenDrainCmd(PORTC,10u,true);

      /* Affects PORTC_PCR11 register */

      PORT_HAL_SetMuxMode(PORTC,11u,kPortMuxAlt2);

      PORT_HAL_SetOpenDrainCmd(PORTC,11u,true);

      break;

    default:

      break;

  }

}

I've tested both the dac/adc operation and i2c operation separately and they seem to work. When I try to integrate both something seems to be wrong with the i2c line. The i2c line is connected to a bluetooth module and the bluetooth module stops working when I try setting up both i2c and adc at the same time. The mcu is acting a slave for i2c. Could it be something with how I initialize the i2c slave and intialize the adc hardware?

I tried calling 'I2C_DRV_SlaveInit(BOARD_I2C_INSTANCE, &userConfig, &slave);' before and after I configure the adc/dac channel

[kerryzhou]

Hi inderjitjutla,

     Did you use the I2C0 module? Did you add the external pullup in PTE24 and PTE25?

     If you comment the dac_adc code just leave the dac_adc initialization in the main.c function, whether your I2C can work ok?

Best Regards,

Jingjing

[inderjitjutla · Accepted solution]

Hello

Turns out the issue was that some of the logic in the .slaveCallback function I was using in the i2c slave config. I wasn't properly handling the i2cEvent and setting the rxBuff/txBuff. My hardware was fine and the hardware_init was correct also. It was just strange because I didn't think a logic issue on the slave could disable my bluetooth lol. Your suggestion of commenting out the dac_adc code eventually led me to discover my issue. Thanks!