D52 Starter kit pins

[Felipe Ribas]

Hi,

I have a working project where I use PWM driver with LEDs on the development board. I make use of the d52_starterkit.h where I have the following definitions:

#define LED_A        24 //LED A on D52 Starter Kit IO Board
#define LED_B        31 //LED B on D52 Starter Kit IO Board
#define LED_C        17 //LED C on D52 Starter Kit IO Board
#define LED_D        20 //LED D on D52 Starter Kit IO Board

and

#define BSP_LED_0      LED_A
#define BSP_LED_1      LED_B
#define BSP_LED_2      LED_C
#define BSP_LED_3      LED_D

#define BSP_LED_0_MASK (1UL<<BSP_LED_0)
#define BSP_LED_1_MASK (1UL<<BSP_LED_1)
#define BSP_LED_2_MASK (1UL<<BSP_LED_2)
#define BSP_LED_3_MASK (1UL<<BSP_LED_3)

It's working fine with the correct LEDs when I start the PWM module like:

nrf_drv_pwm_config_t const nrf_drv_pwm_config =
{
    .output_pins =
    {
            BSP_LED_2 | NRF_DRV_PWM_PIN_INVERTED,   // channel 0
            NRF_DRV_PWM_PIN_NOT_USED,             	// channel 1
			BSP_LED_3 | NRF_DRV_PWM_PIN_INVERTED,   // channel 2
            NRF_DRV_PWM_PIN_NOT_USED              	// channel 3
    },
    ...

My question is: why the LED pins here are 24, 31, 17 and 20 instead of 17, 18, 19 and 20 according to the DK documentation (P0.17, P0.18, P0.19 and P0.20)?

[Jørgen Holmefjord]

Hi,

The D52 starter kit from Dynastream have a different hardware layout than the nRF52-DK from Nordic Semiconductor. If you look in the pinout chapter (1.6) of the D52 starter kit user guide, you will see that the LEDs on the IO Board is connected like this:

nRF52 pin:   Component:
P017         LED C
P031         LED B
P024         LED A
P020         LED D

Best regards,

Jørgen

[Felipe Ribas]

Thanks, that's exaclty my board. I'm using Eclipse but I just found out what happened. I was using my own makefile (where it was defined BOARD_PCA10040) but in the eclipse env it was defined the BOARD_D52DK1. So following the definitions was leading me to d52_starterkit.h. Already fixed it, thanks again.