51822 GPIO break donw the chip

RE: 51822 GPIO break donw the chip

Øyvind Karlsen — Thu, 21 Jul 2016 06:19:29 GMT

I agree that this is somewhat confusing, I will attempt to clarify a bit.

H0H1 indicates high drive on both logical '0' and '1'.
S0S1 indicates standard drive on both logical '0' and '1'
S0H1 indicates standard drive on logical '0' and high drive on logical '1'
and so forth...

Best regards,

Øyvind

RE: 51822 GPIO break donw the chip

hawk — Thu, 21 Jul 2016 02:33:43 GMT

yes. but h0h1 option it make me not very clear.. as Mr stenfan explain above (GPIO drive guide )： High source means the pin will be sourced with up to 5.0 mA for high signal High sink means the pin will be sinked with up to 15.0 mA for low signal ， it mean that h0h1, h1==5.0mA high signal, h0 == -15mA, low signal ???

RE: 51822 GPIO break donw the chip

Øyvind Karlsen — Wed, 20 Jul 2016 06:49:10 GMT

Good. So its working now?

RE: 51822 GPIO break donw the chip

hawk — Wed, 20 Jul 2016 05:41:53 GMT

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

RE: 51822 GPIO break donw the chip

Øyvind Karlsen — Tue, 19 Jul 2016 09:25:03 GMT

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

Øyvind

RE: 51822 GPIO break donw the chip

hawk — Mon, 18 Jul 2016 14:26:53 GMT

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 ?

RE: 51822 GPIO break donw the chip

Stefan Birnir Sverrisson — Fri, 29 Jan 2016 15:02:43 GMT

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);
}