D52 Starter kit pins

Question

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 · Accepted Answer

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