Add Shelly Mini1G3, Mini1PMG3 and MiniPMG3 (#36)

Co-authored-by: Thomas Brasser <thomas@brasser.family>

raw/esp32c3/Shelly_Mini1G3/bootloader.be

@@ -0,0 +1,108 @@
+#
+# Flash bootloader from URL or filesystem
+#
+
+class bootloader
+  static var _addr = [0x1000, 0x0000]         # possible addresses for bootloader
+  static var _sign = bytes('E9')              # signature of the bootloader
+  static var _addr_high = 0x8000              # address of next partition after bootloader
+
+  # get the bootloader address, 0x1000 for Xtensa based, 0x0000 for RISC-V based (but might have some exception)
+  # we prefer to probed what's already in place rather than manage a hardcoded list of architectures
+  # (there is a low risk of collision if the address is 0x0000 and offset 0x1000 is actually E9)
+  def get_bootloader_address()
+    import flash
+    # let's see where we find 0xE9, trying first 0x1000 then 0x0000
+    for addr : self._addr
+      if flash.read(addr, size(self._sign)) == self._sign
+        return addr
+      end
+    end
+    return nil
+  end
+
+  #
+  # download from URL and store to `bootloader.bin`
+  #
+  def download(url)
+    # address to flash the bootloader
+    var addr = self.get_bootloader_address()
+    if addr == nil    raise "internal_error", "can't find address for bootloader" end
+
+    var cl = webclient()
+    cl.begin(url)
+    var r = cl.GET()
+    if r != 200    raise "network_error", "GET returned "+str(r) end
+    var bl_size = cl.get_size()
+    if bl_size <= 8291   raise "internal_error", "wrong bootloader size "+str(bl_size) end
+    if bl_size > (0x8000 - addr)  raise "internal_error", "bootloader is too large "+str(bl_size / 1024)+"kB" end
+
+    cl.write_file("bootloader.bin")
+    cl.close()
+  end
+
+  # returns true if ok
+  def flash(url)
+    var fname = "bootloader.bin"      # default local name
+    if url != nil
+      if url[0..3] == "http"          # if starts with 'http' download
+        self.download(url)
+      else
+        fname = url                   # else get from file system
+      end
+    end
+    # address to flash the bootloader
+    var addr = self.get_bootloader_address()
+    if addr == nil    tasmota.log("OTA: can't find address for bootloader", 2) return false end
+
+    var bl = open(fname, "r")
+    if bl.readbytes(size(self._sign)) != self._sign
+      tasmota.log("OTA: file does not contain a bootloader signature", 2)
+      return false
+    end
+    bl.seek(0)    # reset to start of file
+
+    var bl_size = bl.size()
+    if bl_size <= 8291   tasmota.log("OTA: wrong bootloader size "+str(bl_size), 2) return false end
+    if bl_size > (0x8000 - addr)  tasmota.log("OTA: bootloader is too large "+str(bl_size / 1024)+"kB", 2) return false end
+
+    tasmota.log("OTA: Flashing bootloader", 2)
+    # from now on there is no turning back, any failure means a bricked device
+    import flash
+    # read current value for bytes 2/3
+    var cur_config = flash.read(addr, 4)
+
+    flash.erase(addr, self._addr_high - addr)   # erase the bootloader
+    var buf = bl.readbytes(0x1000)              # read by chunks of 4kb
+    # put back signature
+    buf[2] = cur_config[2]
+    buf[3] = cur_config[3]
+    while size(buf) > 0
+      flash.write(addr, buf, true)        # set flag to no-erase since we already erased it
+      addr += size(buf)
+      buf = bl.readbytes(0x1000)            # read next chunk
+    end
+    bl.close()
+    tasmota.log("OTA: Booloader flashed, please restart", 2)
+    return true
+  end
+end
+
+return bootloader
+
+#-
+
+### FLASH
+import bootloader
+bootloader().flash('https://raw.githubusercontent.com/espressif/arduino-esp32/master/tools/sdk/esp32/bin/bootloader_dio_40m.bin')
+
+#bootloader().flash('https://raw.githubusercontent.com/espressif/arduino-esp32/master/tools/sdk/esp32/bin/bootloader_dout_40m.bin')
+
+### FLASH from local file
+bootloader().flash("bootloader-tasmota-c3.bin")
+
+#### debug only
+bl = bootloader()
+print(format("0x%04X", bl.get_bootloader_address()))
+
+-#

raw/esp32c3/Shelly_Mini1G3/init.bat

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+Br load("Shelly_Mini1G3.autoconf#migrate_shelly.be")
+Template {"NAME":"Shelly Mini1G3","GPIO":[320,32,0,4736,0,0,0,224,0,0,192,0,0,0,0,0,0,0,0,0,0,0],"FLAG":0,"BASE":1}
+Module 0
+AdcParam1 2,10000,10000,3350

raw/esp32c3/Shelly_Mini1G3/migrate_shelly.be

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+# migration script for Shelly
+
+# simple function to copy from autoconfig archive to filesystem
+# return true if ok
+def cp(from, to)
+  import path
+  if to == nil    to = from   end     # to is optional
+  if !path.exists(to)
+    try
+      # tasmota.log("f_in="+tasmota.wd + from)
+      var f_in = open(tasmota.wd + from)
+      var f_content = f_in.readbytes()
+      f_in.close()
+      var f_out = open(to, "w")
+      f_out.write(f_content)
+      f_out.close()
+    except .. as e,m
+      tasmota.log("OTA: Couldn't copy "+to+" "+e+" "+m,2)
+      return false
+    end
+    return true
+  end
+  return true
+end
+
+# make some room if there are some leftovers from shelly
+import path
+path.remove("index.html.gz")
+
+# copy some files from autoconf to filesystem
+var ok
+ok = cp("bootloader-tasmota-c3.bin")
+ok = cp("Partition_Wizard.tapp")
+
+# use an alternative to partition_core that can read Shelly's otadata
+tasmota.log("OTA: loading "+tasmota.wd + "partition_core_shelly.be", 2)
+load(tasmota.wd + "partition_core_shelly.be")
+
+# load bootloader flasher
+tasmota.log("OTA: loading "+tasmota.wd + "bootloader.be", 2)
+load(tasmota.wd + "bootloader.be")
+
+
+# all good
+if ok
+  # do some basic check that the bootloader is not already in place
+  import flash
+  if flash.read(0x1000, 4) == bytes('CD3F6395')
+    tasmota.log("OTA: bootloader already in place, not flashing it")
+  else
+    ok = global.bootloader().flash("bootloader-tasmota-c3.bin")
+  end
+  if ok
+    var p = global.partition_core_shelly.Partition()
+    p.save()      # save with otadata compatible with new bootloader
+    tasmota.log("OTA: Shelly migration successful", 2)
+  end
+end
+
+# dump logs to file
+var lr = tasmota_log_reader()
+var f_logs = open("migration_logs.txt", "w")
+var logs = lr.get_log(2)
+while logs != nil
+  f_logs.write(logs)
+  logs = lr.get_log(2)
+end
+f_logs.close()
+
+# Done