add real time counter

nrf52840/Makefile

@@ -22,6 +22,11 @@ SRC_FILES += \
   $(SDK_ROOT)/modules/nrfx/mdk/system_nrf52840.c \
   $(SDK_ROOT)/external/segger_rtt/SEGGER_RTT.c \
   $(SDK_ROOT)/external/segger_rtt/SEGGER_RTT_printf.c \
+  $(SDK_ROOT)/integration/nrfx/legacy/nrf_drv_clock.c \
+  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_rtc.c \
+  $(SDK_ROOT)/modules/nrfx/drivers/src/nrfx_clock.c \
+
+
 
 # Include folders common to all targets
 INC_FOLDERS += \
@@ -44,6 +49,9 @@ INC_FOLDERS += \
   $(SDK_ROOT)/external/segger_rtt \
   $(PROJ_DIR) \
   $(SDK_ROOT)/components/libraries/util \
+  $(SDK_ROOT)/integration/nrfx/legacy \
+  $(SDK_ROOT)/modules/nrfx/drivers/include \
+
 
 # Libraries common to all targets
 LIB_FILES += \

nrf52840/app_config.h

@@ -0,0 +1,42 @@
+// <h> segger_rtt - SEGGER RTT
+
+//==========================================================
+// <o> SEGGER_RTT_CONFIG_BUFFER_SIZE_UP - Size of upstream buffer. 
+// <i> Note that either @ref NRF_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE
+// <i> or this value is actually used. It depends on which one is bigger.
+
+#ifndef SEGGER_RTT_CONFIG_BUFFER_SIZE_UP
+#define SEGGER_RTT_CONFIG_BUFFER_SIZE_UP 64
+#endif
+
+// <o> SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS - Size of upstream buffer. 
+#ifndef SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS
+#define SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS 2
+#endif
+
+// <o> SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN - Size of upstream buffer. 
+#ifndef SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN
+#define SEGGER_RTT_CONFIG_BUFFER_SIZE_DOWN 16
+#endif
+
+// <o> SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS - Size of upstream buffer. 
+#ifndef SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS
+#define SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS 2
+#endif
+
+// <o> SEGGER_RTT_CONFIG_DEFAULT_MODE  - RTT behavior if the buffer is full.
+ 
+
+// <i> The following modes are supported:
+// <i> - SKIP  - Do not block, output nothing.
+// <i> - TRIM  - Do not block, output as much as fits.
+// <i> - BLOCK - Wait until there is space in the buffer.
+// <0=> SKIP 
+// <1=> TRIM 
+// <2=> BLOCK_IF_FIFO_FULL 
+
+#ifndef SEGGER_RTT_CONFIG_DEFAULT_MODE
+#define SEGGER_RTT_CONFIG_DEFAULT_MODE 2
+#endif
+
+

nrf52840/main.c

@@ -51,36 +51,93 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdint.h>
+#include "nrf.h"
+#include "nrf_gpio.h"
 #include "nrf_delay.h"
 #include "boards.h"
 
+#include "nrf_drv_rtc.h"
+#include "nrf_drv_clock.h"
+
 #include "SEGGER_RTT.h"
 
-/**
- * @brief Function for application main entry.
+
+#define COMPARE_COUNTERTIME  (3UL)                                        /**< Get Compare event COMPARE_TIME seconds after the counter starts from 0. */
+
+#ifdef BSP_LED_0
+    #define TICK_EVENT_OUTPUT     BSP_LED_0                                 /**< Pin number for indicating tick event. */
+#endif
+#ifndef TICK_EVENT_OUTPUT
+    #error "Please indicate output pin"
+#endif
+#ifdef BSP_LED_1
+    #define COMPARE_EVENT_OUTPUT   BSP_LED_1                                /**< Pin number for indicating compare event. */
+#endif
+#ifndef COMPARE_EVENT_OUTPUT
+    #error "Please indicate output pin"
+#endif
+
+const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(0); /**< Declaring an instance of nrf_drv_rtc for RTC0. */
+
+
+
+/** @brief Function starting the internal LFCLK XTAL oscillator.
  */
+static void lfclk_config(void)
+{
+    ret_code_t err_code = nrf_drv_clock_init();
+    APP_ERROR_CHECK(err_code);
+
+    nrf_drv_clock_lfclk_request(NULL);
+}
+
+static void rtc_config(void)
+{
+    uint32_t err_code;
+
+    //Initialize RTC instance
+    nrf_drv_rtc_config_t config = NRF_DRV_RTC_DEFAULT_CONFIG;
+    config.prescaler = 32;
+    err_code = nrf_drv_rtc_init(&rtc, &config, NULL);
+    APP_ERROR_CHECK(err_code);
+
+    //Enable tick event & interrupt
+    /*nrf_drv_rtc_tick_enable(&rtc,true);*/
+
+    /*//Set compare channel to trigger interrupt after COMPARE_COUNTERTIME seconds*/
+    /*err_code = nrf_drv_rtc_cc_set(&rtc,0,COMPARE_COUNTERTIME * 8,true);*/
+    /*APP_ERROR_CHECK(err_code);*/
+
+    //Power on RTC instance
+    nrf_drv_rtc_enable(&rtc);
+}
+
 int main(void)
 {
     /* Configure board. */
     bsp_board_init(BSP_INIT_LEDS);
+    lfclk_config();
+    rtc_config();
     SEGGER_RTT_printf(0, "Hello FIDO2\n");
-    /*SEGGER_RTT_Init();*/
+
+    uint32_t count;
     int i = 0;
 
-    /* Toggle LEDs. */
-    while (true)
+    while (1)
     {
         i++;
         for (int i = 0; i < LEDS_NUMBER; i++)
         {
             bsp_board_led_invert(i);
-            nrf_delay_ms(100);
+            nrf_delay_ms(25);
         }
+        count = nrf_drv_rtc_counter_get(&rtc);
+
         printf("toggle\r\n");
         SEGGER_RTT_SetTerminal(0);
-        SEGGER_RTT_printf(0, "Hello World %d!\n", i);
+        SEGGER_RTT_printf(0, "Hello World %d!\n", count);
         SEGGER_RTT_SetTerminal(1);
-        SEGGER_RTT_printf(0, "Hello World %d!\n", i*i);
+        SEGGER_RTT_printf(0, "Hello World %d!\n", i);
     }
 }