HT-CT62 upload with uart

#1

Hi, i bought 10 Heltec Ht-CT62. I make a pcb, i connect vdd at 3.3v and EN at 3.3V. I connect all Gnd to Gnd of my buck converter. All voltages are ok. I connect pin20 (txd) and pin19(rxd) to rx and tx of a usb to serial uart converter(pl2303 usb uart board). I cant upload programm from arduino ide. should i miss something about e or gpio9(pin 15)? what i have to do? i never achieved to upload to this product

#2

To get into download mode on the ESP32C3, take GPIO9 pin 15 low, then take EN low then high. You should see “waiting for download” on your serial monitor.

#3

so, i send to gpio9 low and i should remain at low when i do the other actions at en? at serial screen what baud rate should i have to see the message waiting for download?

#4

I have a push button switch on my GPIO9 so it always goes back high after I press the reset switch.
Reset push button on EN, Push button on GPIO9 both are pulled high when the switch is in the “up” position. Both go low when you press the respective switch button.

Press and hold GPIO9, press and release the Reset(EN) then release GPIO9

115200 is the baud rate. I use Coolterm as a Serial Terminal program on Windows to see the message. Disconnect Coolterm before trying to download the code.
What I see on the serial monitor:

ESP-ROM:esp32c3-api1-20210207
Build:Feb 7 2021
rst:0x1 (POWERON),boot:0x4 (DOWNLOAD(USB/UART0/1))
waiting for download