what's timing requirement of GPIOE detect rising/fall edge?

[wen jin zhang]

we now using GPIO as input. when it rise then start timer. but it seem failed. No GPIOE IN event happened.

what's timing need for rising/fall edge detecting? < XX (us)? How sharp it need be?

[Susheel Nuguru]

There is nothing in the GPIO to generate events. When you have enabled the "Sense" mechanism on your input pin through the GPIO configuration, It will generate a detect signal which in turn will generate a PORT event inside GPIOTE.

This detection sampling should happen atleast at the speed of internal clock, so 0.06us. I am pretty confident that the chip won't miss it if it happens.

[wen jin zhang]

sorry! I did not remember how much changes in NRF_GPIO->PIN_CNF[]. but this config working for our board. detect the RISE Event.

NRF_GPIO->PIN_CNF[zx] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
                        | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
                        | (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
                        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);

NRF_GPIOTE->CONFIG[2] = (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos)
                        | ((uint32_t)zx    << GPIOTE_CONFIG_PSEL_Pos)
                        | ((uint32_t)GPIOTE_CONFIG_POLARITY_LoToHi << GPIOTE_CONFIG_POLARITY_Pos)
                        | ((uint32_t)GPIOTE_CONFIG_OUTINIT_Low << GPIOTE_CONFIG_OUTINIT_Pos);

appreciate your help!