[uploader] toggle RESET via DTR

Author: lujji

Makefile

@@ -40,7 +40,7 @@ clean:
 
 size:
 	@$(OBJCOPY) -I ihex --output-target=binary $(TARGET) $(TARGET).bin
-	@echo '-----\nImage size:'
+	@echo "-----\nImage size:"
 	@stat -L -c %s $(TARGET).bin
 
 # enable write-protection on first 10 pages

README.md

@@ -32,12 +32,12 @@ $ make && make flash
 Enable write-protection (UBC) on pages 0-10:
 
 ``` bash
-make opt-set
+$ make opt-set
 ```
 
 ## Uploading the firmware
 
-There is a demo application inside `app` directory which toggles PD4 via interrupts. To upload the application short PD3 to ground, power-cycle the MCU and run the uploader utility.
+There is a demo application inside `app` directory which toggles PD4 via interrupts. To upload the application short PD3 to ground, power-cycle the MCU and run the uploader utility. DTR pin on UART-USB converter can be connected to RESET pin on STM8 for automatic reset.
 
 ``` bash
 $ cd app && make

uploader/boot.py

@@ -30,6 +30,11 @@ def get_crc():
     return crc
 
 def bootloader_enter(ser):
+    # toggle reset via DTR
+    ser.setDTR(True)
+    sleep(0.1)
+    ser.setDTR(False)
+    # send payload
     req = bytearray(REQ_ENTER)
     chunks = os.path.getsize(FILE)
     chunks = int(math.ceil(float(chunks) / BLOCK_SIZE))