how to enable gpio pin after button events

RE: how to enable gpio pin after button events

MARTIN FR — Mon, 14 Dec 2015 13:13:35 GMT

In my project i prefere to use HODI because intially i configure the pin 6 as output so set to high(nrf_gpio_pin_set) so that it can produce 5mA at the output and make the buzzer beep little more louder after that i will clear that pin 6 to low (nrf_gpio_pin_clear)so for this function HOD1 is better or HOH1? can you suggest me whicch is more preferable and overall less power consumption?

RE: how to enable gpio pin after button events

Anders Strand — Mon, 14 Dec 2015 12:34:00 GMT

See the Reference Manual page 68.

S0S1 0 Standard '0', standard '1'
H0S1 1 High drive '0', standard '1'
S0H1 2 Standard '0', high drive '1'
H0H1 3 High drive '0', high 'drive '1''
D0S1 4 Disconnect '0' standard '1'
D0H1 5 Disconnect '0', high drive '1'
S0D1 6 Standard '0'. disconnect '1'
H0D1 7 High drive '0', disconnect '1'

H0H1 means that the pin is in high drive both when it is low (0), and when it is high (1). H0D1 Means that it is in high drive when it is low (0), and disconnected when it is high (1).

If you want to measure current, use an ampere meter.

RE: how to enable gpio pin after button events

MARTIN FR — Mon, 14 Dec 2015 10:42:26 GMT

thanks for your reply i managed to do can you tell me i want to set the pin 6 and pin 7 in high drive mode i am using this function based on some other post

NRF_GPIO->PIN_CNF[6] = (GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos);

does this will make the pin 6 drive in 5mA current mode ? how can i check this pin 6 is providing 5mA? can you give me some information about his HOH1and HOD1 because it is not clear for me

RE: how to enable gpio pin after button events

Anders Strand — Fri, 11 Dec 2015 13:12:06 GMT

Hi.

Since you did not write which pins you are talking about, i assume (from reading the code) that you mean pin 6 and 7.

Inside init_gpio(); you do the following:

    nrf_gpio_range_cfg_input(BUTTON_1, BUTTON_2, NRF_GPIO_PIN_PULLUP);//
    nrf_gpio_range_cfg_output(0, 7); 
	nrf_gpio_pin_set(6); //clear the LED                              
    nrf_gpio_pin_set(7);//clear the LED

The last two lines will set pin 6 and 7 high. If you comment out these two lines, and put them inside your button handler instead, they will stay low until the button is pressed.

case BUTTON_1:		 
     app_timer_start(m_timer_id, MS_TO_TICKS(BUTTON_PRESS_TIME_MS), NULL); 
     nrf_gpio_pin_set(6); //clear the LED                              
     nrf_gpio_pin_set(7);//clear the LED
     break;