Port pin configured as ADC input at POR?

mike_hackett — Thu, 05 Jul 2018 10:19:01 GMT

I have the LPC824.

I use PIO0_20 as a simple port pin set to output that I manually change its status in code - Chip_GPIO_SetPinState(.....) - at certain specific times.

The port pin was not doing any action at all.

After some delving in debug mode, I found that in the SVM register ADC_6 was set to 0 , thusly enabling ADC_6.

I don't set ADC_6 to be enabled in my code. ADC_6 at POR should be disabled by default (set to 1).

Has anybody else seen this?

Re: Port pin configured as ADC input at POR?

victorjimenez — Thu, 05 Jul 2018 19:01:47 GMT

Hello Mike,

Recently was released the SDK for the LPC824. I modified the example mrt_example provided in the SDK to toggle the pin P0_20 on each MRT interrupt, and everything worked perfect.

Here are the changes that I made to the example. Before entering the infinite loop I configured the pin P0_20 as follows:

    /* Define the init structure for the output pin*/
    gpio_pin_config_t pin_config = {
        kGPIO_DigitalOutput, 0,
    };

    GPIO_PortInit(GPIO, 0);//Initialize the port
    GPIO_PinInit(GPIO, 0, 20, &pin_config);//Initialize the port as an output‍‍‍‍‍‍‍

In the infinite loop inside the if statement I added the line to toggle the pin:

    while (true)
    {
        /* Check whether occur interupt and toggle LED */
        if (true == mrtIsrFlag)
        {
            PRINTF("\r\n Channel No.0 interrupt is occured !");
            APP_LED_TOGGLE;
            GPIO_PortToggle(GPIO, 0, 1u << 20);//Toggle the led
            mrtIsrFlag = false;
        }
    }‍‍‍‍‍‍‍‍‍‍‍

It's important that you add the following include into the example:

#include "fsl_gpio.h"‍

Hope it helps!

Victor.

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

topic Re: Port pin configured as ADC input at POR? in LPC Microcontrollers

Port pin configured as ADC input at POR?

Re: Port pin configured as ADC input at POR?