Can't read from gpio

[kruenheck]

Trying to read button 3 on the npm1300-ek, which is gpio 1 according to the schematic. The following #defines represent the gpio related registers on the npm1300:

#define GPIOS_MSB         0x06                     // GPIO registers MSB=0x600, individual registers below are added to this 

#define GPIO_MODE1      0x01                     // mode for gpio one (pin)

#define GPIO_STATUS_LOWER    0x1e       // gpio status (all five pins)

I verified that gpio 1 is set to an input using the following:

uint8_t regsy[] = {GPIOS_MSB, GPIO_MODE1};                            

ret = i2c_write_read_dt(&dev_i2c_pmic, regsy, 2, &valRead, 1); 

valRead came back zero indicating to me that the pin is an input

But when I press the button and read the inputs with the following:

uint8_t regsy[] = {GPIOS_MSB, GPIO_STATUS_LOWER};                            

ret = i2c_write_read_dt(&dev_i2c_pmic, regsy, 2, &valRead, 1); 

valRead comes back zero, indicating that the button hasn't affected the pin (it's also zero when the button isn't pressed)

Note that I can perform a write/read to an adc register and get the correct value back, so i2c should be working.

What am I missing?

[Vidar Berg]

Hello,

I did not get around to testing this today, but we have a sample demonstrating how you can use the Zephyr GPIO driver API with the PMIC here: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/pmic/native/npm13xx_one_button/README.html. Have you tried this already? 

The PMIC GPIO driver/shim can be found here: https://github.com/nrfconnect/sdk-zephyr/blob/main/drivers/gpio/gpio_npm13xx.c 

Best regards,

Vidar

[kruenheck]

Vidar,

I don't know what I'm supposed to do with a PMIC GPIO driver/shim.

I tried the npm13xx_one_button sample, but I'm not seeing the callback event (I put a printk() in

event_callback()).

I'm not testing the battery at this point, just trying to see a button, so I didn't set any of the jumpers mentioned in the readMe. But I did make the following connections:

SDA	P0.26
SCL	P0.27
GPIO3	P0.04
VDDIO	VDD
GND	GND

Without adding the npm1300.overlay or the Extra CMake argument, I see "PMIC device ok" (but no call back). However, when I add either the overlay or the cmake argument, I get "Error: led device is not ready"

I'm not sure where to go from here

[kruenheck]

It works now, thank you very much!

[kruenheck]

Vidar,

I have two follow up questions:

1. How can I put the extra build command: -DSHIELD=npm1300_ek into a file so it doesn't need to be an extra command? I tried putting it in cmakelists.txt with set( SHIELD "npm1300_ek"), but that didn't do it. 

2. How can I blink a different led? The example, npm13xx_two_button blinks ld3 (host) with the commands: led_on(leds, 1U); and led_off(leds, 1U); I tried replacing the 1U with 0U, 2U and 3U, but with those values the leds do nothing. 

Thank you

[Vidar Berg]

1.

kruenheck said:

I tried putting it in cmakelists.txt with set( SHIELD "npm1300_ek"), but that didn't do it. 

This should work if it's placed before the find_package() line. Instead of including the shiled, you can also define your own board that includes the definitions from the overlay added by this shield:

https://github.com/nrfconnect/sdk-zephyr/blob/main/boards/shields/npm1300_ek/npm1300_ek.overlay 

Or create an overlay for your existing build target (nrf52833dk_nrf52833.overlay) that includes the same definition as the npm1300_ek.overlay.

2. For the LED to be controllable it must configured in the host mode here: 

The default mode can be selected by changing the overlay here:

Description of the properties from binding:

Best regards,

Vidar

[kruenheck]

Both of your solutions worked. Thank you

[kruenheck]

Hi Vidar,

using the npm13xx_two_button project, is there a way to have the pmic come out of ship/hold after a longer button press? Right now it comes out on a short press, which I assume is the default.

I tried the following:

WritePmic(SHIP_REGS_MSB, TASKENTERSHIPMODE_LSB, 0x01);   

WritePmic(SHIP_REGS_MSB, SHPHLDCONFIG_LSB, 0x07);        //0x7=3008ms

ReadPmic(EVENT_MSB, EVENTSVBUSIN0SET_LSB);               

WritePmic(SHIP_REGS_MSB, TASKSHPHLDCFGSTROBE_LSB, 0x01); // strobe it

The board comes out of ship mode after a three second button press but immediately turns off again

Thank you,

Keith

[Vidar Berg]

Hi Keith,

Please try to apply the configurations before entering shipmode as mentioned in the note here: 

[kruenheck]

Vidar,

This is where I got the commands I'm using, but they don't work.

[Vidar Berg]

Hi Keith,

Yes, but the commands must be issued in the correct order.