Issue with Bare-Metal Programming of nRF52-DK

Question

Hey everyone, 
 I've been trying to get this basic bare-metal application to work. I don't need a softdevice as I'm just trying to turn on an LED. The application compiles just fine, I can step through the code with the debugger, but the registers don't seem to be set! Can anyone help? 
 Thanks, 
 ~Aaron 
 nRF52_Temp.zip

MartinBL · Accepted Answer

Seems to work for me. Can you try to read out the GPIO->PIN_CNF[11] register with nrfjprog --memrd 0x5000072C before and after you configure the GPIO? My output is 00000002 before the configuration and 00000303 after, which is the correct configuration. This code toggles LED_2 on my nRF52 DK kit. #include "board.h" #include "basics.h" int main(void) { init(); // Test while (1) { GPIO->PIN_CNF[18] = ((uint32_t) GPIO_PIN_CNF_DIR_OUTPUT << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t) GPIO_PIN_CNF_INPUT_DISCONNECT << GPIO_PIN_CNF_INPUT_Pos) | ((uint32_t) GPIO_PIN_CNF_NOPULL << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t) GPIO_PIN_CNF_DRIVE_H0H1 << GPIO_PIN_CNF_DRIVE_Pos) | ((uint32_t) GPIO_PIN_CNF_NOSENSE << GPIO_PIN_CNF_SENSE_Pos); GPIO->OUTSET = (1UL << 18); GPIO->OUTCLR = (1UL << 18); } return 0;

Issue with Bare-Metal Programming of nRF52-DK

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