Issues flashing nodemcu
Posted: Sun Sep 20, 2015 10:57 amFirst, I want to thank you all for such wonderful work. The ESP 8266 is a revolutionary product that seems to be taking the world by storm. Unfortunately so much so that “good” documentation is hard to find. In my quest to understand this marvelous device I’ve accessed multiple forums and blogs. And now I think I’ve painted myself into a corner (again 
). I’m hoping someone can shed some light on my problem and perhaps resolve it.
History:
I purchased an ESP-7 module to experiment with and then adapter board to give better access to the pins. It powered up fine and AT commands worked. Wanting to do better I flashed it with nodemcu, following instructions from a blogger on the internet. That too worked well. The next thing that blog instructed was to upload a sketch to blink an LED, thereby verifying that the module could accept and run programming. That too worked(aside of some confusion over GPIO identification I commented on in another post). After letting that soak in, I thought it was time to move on.
Now:
Here’s where the trouble started. When trying to send commands from a lua terminal, I would get errors back. I don’t know enough about all this yet to say if the errors came from the module or the lua interpreter. I decided to reflash the nodemcu firmware, but it wouldn’t work. Using the flasher provided, It would upload around 10% or so, then time out. Obviously I tried multiple times with the same results.
I then tried to “go back” to the original AT command set using Elextrodragon’s flasher and their AT command .bin that too would not flash, again about 10% would load, then fail. It’s as if the memory map has been corrupted some how, or for some reason isn’t available for loading. I then went back to the flasher provided by the nodemcu group and tried flashing again, this time I set the values to default in the configuration. One interesting thing this did was set the baud rate at 230400 not 9600. It appeared to do a successful flash. But when I tried to communicate with the module it wouldn't respond at any baud rate.
Can anyone provide any information on this? Please keep in mind that I am not an engineer although I’ve worked with microprocessors most of my life, and understand at least the principles. Any help would be greatly appreciated.
). I’m hoping someone can shed some light on my problem and perhaps resolve it.History:
I purchased an ESP-7 module to experiment with and then adapter board to give better access to the pins. It powered up fine and AT commands worked. Wanting to do better I flashed it with nodemcu, following instructions from a blogger on the internet. That too worked well. The next thing that blog instructed was to upload a sketch to blink an LED, thereby verifying that the module could accept and run programming. That too worked(aside of some confusion over GPIO identification I commented on in another post). After letting that soak in, I thought it was time to move on.
Now:
Here’s where the trouble started. When trying to send commands from a lua terminal, I would get errors back. I don’t know enough about all this yet to say if the errors came from the module or the lua interpreter. I decided to reflash the nodemcu firmware, but it wouldn’t work. Using the flasher provided, It would upload around 10% or so, then time out. Obviously I tried multiple times with the same results.
I then tried to “go back” to the original AT command set using Elextrodragon’s flasher and their AT command .bin that too would not flash, again about 10% would load, then fail. It’s as if the memory map has been corrupted some how, or for some reason isn’t available for loading. I then went back to the flasher provided by the nodemcu group and tried flashing again, this time I set the values to default in the configuration. One interesting thing this did was set the baud rate at 230400 not 9600. It appeared to do a successful flash. But when I tried to communicate with the module it wouldn't respond at any baud rate.
Can anyone provide any information on this? Please keep in mind that I am not an engineer although I’ve worked with microprocessors most of my life, and understand at least the principles. Any help would be greatly appreciated.