VesiScan BASIC origin: Piezo + IMU firmware initial code

- nRF52840 + SoftDevice S140 BLE firmware
- Piezo ultrasound TX driver (2MHz, 8ch MUX)
- ICM42670P IMU 6-axis driver
- Echo AFE chain (ADA2200 + ADC121S051)
- BLE NUS command parser (mpa/mpc/mdc/mec/maa/msp)
- FDS flash config storage
- pc_firm parser and ADC driver included

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

project/ble_peripheral/ble_app_bladder_patch/debug_print.h

@@ -5,8 +5,8 @@
 #define ENABLE_PRINTF 1  // Set to 0 to disable globally
 
 #if ENABLE_PRINTF
-    #include <stdio.h>
-    #define DBG_PRINTF(...) printf(__VA_ARGS__)
+    #include "SEGGER_RTT.h"
+    #define DBG_PRINTF(...) SEGGER_RTT_printf(0, __VA_ARGS__)
 #else
     #define DBG_PRINTF(...) // Do nothing
 #endif