Restore uf2reset CLI after PR merges

docs/cli_commands.md

@@ -28,12 +28,35 @@ This document provides an overview of CLI commands that can be sent to MeshCore
 **Usage:** 
 - `reboot`
 
+**Note:** No reply is sent.
+
+---
+
+### Power-off the node
+**Usage:**
+- `poweroff`, or
+- `shutdown`
+
+**Note:** No reply is sent.
+
+---
+
+### Enter the UF2 bootloader (nRF52 only)
+**Usage:**
+- `uf2reset`
+
+**Serial Only:** Yes
+
+**Note:** Reboots directly into the UF2 bootloader on supported nRF52 boards.
+
 ---
 
 ### Reset the clock and reboot
 **Usage:**
 - `clkreboot`
 
+**Note:** No reply is sent.
+
 ---
 
 ### Sync the clock with the remote device

src/helpers/CommonCLI.cpp

@@ -4,6 +4,30 @@
 #include "AdvertDataHelpers.h"
 #include "TxtDataHelpers.h"
 #include <RTClib.h>
+
+#if defined(NRF52_PLATFORM)
+#include <nrf.h>
+#include <nrf_soc.h>
+
+#ifndef DFU_MAGIC_UF2_RESET
+#define DFU_MAGIC_UF2_RESET 0x57
+#endif
+
+static void resetToUf2Bootloader() {
+  uint8_t sd_enabled = 0;
+  sd_softdevice_is_enabled(&sd_enabled);
+
+  if (sd_enabled) {
+    sd_power_gpregret_clr(0, 0xFF);
+    sd_power_gpregret_set(0, DFU_MAGIC_UF2_RESET);
+  } else {
+    NRF_POWER->GPREGRET = DFU_MAGIC_UF2_RESET;
+  }
+
+  NVIC_SystemReset();
+}
+#endif
+
 #define STR_HELPER(x) #x
 #define STR(x) STR_HELPER(x)
 
@@ -414,11 +438,17 @@ void CommonCLI::handleCommand(uint32_t sender_timestamp, char* command, char* re
       _board->powerOff();  // doesn't return
     } else if (memcmp(command, "reboot", 6) == 0) {
       _board->reboot();  // doesn't return
+    } else if (sender_timestamp == 0 && memcmp(command, "uf2reset", 8) == 0 && (command[8] == 0 || command[8] == ' ')) {
+#if defined(NRF52_PLATFORM)
+      resetToUf2Bootloader();  // doesn't return
+#else
+      strcpy(reply, "ERR: unsupported");
+#endif
     } else if (memcmp(command, "clkreboot", 9) == 0) {
       // Reset clock
       getRTCClock()->setCurrentTime(1715770351);  // 15 May 2024, 8:50pm
       _board->reboot();  // doesn't return
-     } else if (memcmp(command, "advert.zerohop", 14) == 0 && (command[14] == 0 || command[14] == ' ')) {
+    } else if (memcmp(command, "advert.zerohop", 14) == 0 && (command[14] == 0 || command[14] == ' ')) {
       // send zerohop advert
       _callbacks->sendSelfAdvertisement(1500, false);  // longer delay, give CLI response time to be sent first
       strcpy(reply, "OK - zerohop advert sent");