51822 GPIO break donw the chip

[mnxnm]

51822, config a pin as output , in the param , set disconnect or connect the input pin, when config as output ,what mean disconnct/connect input pin?

I use a pin to light a led, config a pin as output ,and connect the pin to a series resistance and a LED, the other side of the led is VDD(3V), when the GPIO is low,the LED is light, when the GPIO is high ,the LED is not bright. it can work, but a moment ,the chip is down, the current can reach 100mA, the chip is broken. I think the LED GPIO is the cause of this failure. How can I use the GPIO in this case?

 GPIO_PIN_CONFIG(PIN_NO,                       
                    GPIO_PIN_CNF_DIR_Output,      
                    GPIO_PIN_CNF_INPUT_Disconnect,
                    GPIO_PIN_CNF_PULL_Disabled,   
                    GPIO_PIN_CNF_DRIVE_S0S1,      
                    GPIO_PIN_CNF_SENSE_Disabled);

#define GPIO_PIN_CNF_INPUT_Connect #define GPIO_PIN_CNF_INPUT_Disconnect

[Stefan Birnir Sverrisson]

Hi

Here is the GPIO drive guide

When you configure a pin as output, what matters is the drive strength. The rest of the configuration is done as in the nrf_gpio.h:

__STATIC_INLINE void nrf_gpio_cfg_output(uint32_t pin_number)
{
		nrf_gpio_cfg(
						pin_number,
						NRF_GPIO_PIN_DIR_OUTPUT,
						NRF_GPIO_PIN_INPUT_DISCONNECT,
						NRF_GPIO_PIN_NOPULL,
						NRF_GPIO_PIN_S0S1,
						NRF_GPIO_PIN_NOSENSE);
}

You would only configure the SENSE, the pull and the input differently when using the pin as input, as done in the following definition in nrf_gpio.h

__STATIC_INLINE void nrf_gpio_cfg_sense_input(uint32_t pin_number, nrf_gpio_pin_pull_t pull_config, nrf_gpio_pin_sense_t sense_config)
{
		nrf_gpio_cfg(
						pin_number,
						NRF_GPIO_PIN_DIR_INPUT,
						NRF_GPIO_PIN_INPUT_CONNECT,
						pull_config,
						NRF_GPIO_PIN_S0S1,
						sense_config);
}

[hawk]

hi，stefan：i use the one gpio pin as output, and config No pull.. the tester found that the wave of high voltage is not horizontal direction. the beginning of wave is high, the end of wave is low.. what it happen.? Some guy say the output power is not enough.. should i need change NO PULL to pull UP ?

[Øyvind Karlsen]

For some applications you may need pull on the GPIO lines, it is hard to know with the information that you supply.

• Øyvind

[hawk]

we config the drive strength of h0h1 to improve the power of output pin. the wave of output pin looks fine.

[Øyvind Karlsen]

Good. So its working now?