Update 'dpctl'

dpctl.md

@@ -27,6 +27,10 @@ subcommands:
     get-mode-info  Shows mode info. A mode can optionally be specified, default
                    is the current mode.
     set-mode       Set the device mode
+    bootloader     Set the device in bootloader mode
+    storage-info   Get persistent storage info
+    storage-flush  Flush persistent storage data to storage medium
+    storage-get    Get data of a particular mode
     uart-cts-rts   Get, enable/disable UART hardware flow control
     tempsensor     Get or set the IRC emulation enable/address of the
                    temperature sensor.
@@ -48,7 +52,7 @@ Shows general device information. No other arguments required. Example:
 ```
 $ ./dpctl.sh get-device-info
 CMSIS-DAP (RP2040 Pico): protocol version: 00.10, currently in mode 1 (Default mode with misc features)
-available modes: 1, 4
+available modes: 1, 3, 4
 ```
 
 #### get-mode-info
@@ -57,14 +61,15 @@ Gets info of a specific mode. An extra mode number can be specified, but it defa
 
 ```
 $ ./dpctl.sh get-mode-info 
-mode 1: Default mode with misc features: version 00.10 with features 1, 2, 3, 4
-$ ./dpctl.sh get-mode-info 4
-mode 4: SUMP logic analyzer mode: version 00.10 with no features 
+mode 1: Default mode with misc features: version 00.10 with features UART, CMSIS-DAP, SPI, I2C, temperature sensor
+$ ./dpctl.sh get-mode-info 3
+mode 3: JTAG (etc) pinout scanner: version 00.10 with features JTAG, SWD
 $ ./dpctl.sh get-mode-info 42
 No mode 42 available
 $ ./dpctl.sh get-mode-info all
-mode  1: Default mode with misc features: version 00.10 with features 1, 2, 3, 4
-mode  4: SUMP logic analyzer mode: version 00.10 with no features 
+mode  1: Default mode with misc features: version 00.10 with features UART, CMSIS-DAP, SPI, I2C, temperature sensor
+mode  3: JTAG (etc) pinout scanner: version 00.10 with features JTAG, SWD
+mode  4: SUMP logic analyzer mode: version 00.10 with features SUMP
 ```
 
 #### set-mode
@@ -75,6 +80,47 @@ This subcommand changes the device mode. Do note that this causes the device to
 $ ./dpctl.sh set-mode 4
 ```
 
+Mode 0 is a special meaning to switch the device into (chip/board-specific) bootloader mode.
+
+#### bootloader
+
+This is a shorthand for `dpctl set-mode 0`.
+
+### Persistent storage subcommands
+
+#### storage-info
+
+Shows the header information of the persistent storage. Example:
+
+```
+$ ./dpctl.sh storage-info
+magic: OK, version=0010, current mode=1, #modes=2, DJB2(table)=780903137
+	mode 1 version 0010: 0x1ff000..+0x2, DJB2=6220460
+	mode 4 version 0010: 0x1ff020..+0x1, DJB2=182954
+```
+
+#### storage-get
+
+Gets the data blob of a specified mode. Example:
+
+```
+$ ./dpctl.sh storage-get 1
+b'\x00\x18'
+```
+
+#### storage-flush
+
+Saves data to the persistent storage when changed. Example:
+
+```
+$ ./dpctl.sh storage-flush
+storage saved
+
+# immediately afterwards:
+$ ./dpctl.sh storage-flush
+no write needed
+```
+
 ### Mode 1-specific subcommands
 
 #### uart-cts-rts