I'm using a custom board designed around this nRF52832 module. I have broken out SWIO/SWCLK/SWO and nRF_RST to a standard Arm 10-pin header.
Using Black Magic Probe, I was able to flash a few test firmware to the device (but with errors).
At the end, I tried the sdk blinky example (nRF5_SDK_17.0.2_d674dde/examples/peripheral/blinky/pca10040/blank/armgcc) with my `custom_board.h` which is defined like this:
#ifndef CUSTOM_BOARD_H
#define CUSTOM_BOARD_H
#ifdef __cplusplus
extern "C" {
#endif
#include "nrf_gpio.h"
// LEDs definitions for my custom board
#define LEDS_NUMBER 2
#define LED_START 4
#define LED_0 4
#define LED_1 5
#define LED_STOP 5
#define LEDS_ACTIVE_STATE 1
#define LEDS_LIST { LED_0, LED_1}
#define BSP_LED_0 LED_0
#define BSP_LED_1 LED_1
/* #define BSP_LED_0_MASK (1<<BSP_LED_0) */
/* #define BSP_LED_1_MASK (1<<BSP_LED_1) */
/* #define LEDS_MASK \ */
/* (BSP_LED_0_MASK | BSP_LED_1_MASK | BSP_LED_2_MASK | BSP_LED_3_MASK | \ */
/* BSP_LED_4_MASK) */
// Defines which LEDs are lit when the signal is high.
#define LEDS_INV_MASK ~LEDS_MASK
/* #define SPIM0_SCK_PIN 25 */
/* #define SPIM0_MOSI_PIN 24 */
/* #define SPIM0_MISO_PIN 23 */
/* #define SPIM0_SS_PIN 30 */
// UART
#define RX_PIN_NUMBER 2
#define TX_PIN_NUMBER 3
#define HWFC false
// Low frequency clock source to be used by the SoftDevice
#define NRF_CLOCK_LFCLKSRC NRF_CLOCK_LFCLKSRC_XTAL_20_PPM
/* #define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_XTAL, \ */
/* .rc_ctiv = 0, \ */
/* .rc_temp_ctiv = 0, \ */
/* .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM} */
#ifdef __cplusplus
}
#endif
#endif
And here is the main.c:
/** @file
*
* @defgroup blinky_example_main main.c
* @{
* @ingroup blinky_example
* @brief Blinky Example Application main file.
*
* This file contains the source code for a sample application to blink LEDs.
*
*/
#include <stdbool.h>
#include <stdint.h>
#include "boards.h"
#include "nrf_delay.h"
#define BOARD_CUSTOM 1
/**
* @brief Function for application main entry.
*/
int main(void) {
/* Configure board. */
bsp_board_init(BSP_INIT_LEDS);
/* Toggle LEDs. */
while (true) {
for (int i = 0; i < LEDS_NUMBER; i++) {
bsp_board_led_invert(i);
nrf_delay_ms(500);
}
}
}
/**
*@}
**/
BMP, flashed the firmware **with erros**. Upon recycling the voltage of the target, the blinky example works (the two leds blink sequentially)
Problem is, I can no longer flash the MCU! BMP reports `SW-DP scan failed!` which means the target is not responding.
1. Could the blinky firmware have bricked the device?
2. How can I recover from this state?
