Exp Board 2.0 serial communication problem

[szyba91]

Update : I just connect exp boards without FiPys. I was courious what will happend when i bridge TX i RX(physical pins 40 and 41) pin on board (should be an echo right?) and i've got echo. So boards it self works.
Now i'm connect the fipy via USB-UART concerter and I can't reach the REPL on both FiPys :( :(

[robert-hh]

@szyba91 The USB/UART bridge must be set to 3.3 V output. And sometimes TX/RX has to be swapped. Please not also that the typcial USB/UART switch cannot supply a FiPy. The simply deliver not enough power.

[szyba91]

@szyba91 Now i've connected the fipy and exp board together and there is no REPL but when i push Reset rutton i'm having this:

rst:0x1 (POWERON_RESET),boot:0x12 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c
Pybytes library: v0.9.0

And it stucks and this command during code uploding. I'm using PuTTY

[robert-hh]

@szyba91 In putty, you have to disable flow control. It is in the Serial/conection tab.

[szyba91]

@robert-hh No change after disable flow control. Maybe I have to wait longer to see >>> because it doesn't stuck?

[robert-hh]

@szyba91 No, the prompt should show up immediately. If you do not care what's in the flashof the device, try installing the standard firmware again (stable, no pybytes) with the option to erase the flash first, at least to erase the filesystem.

[szyba91]

@robert-hh It worked ! You are the best :) As for updates now i've marked the "Erese flsh file system" (I havnt markd it on my previous updates) and I've chosen type :"stable" I had i 'pycom" before.
Is it correct?

[robert-hh]

@szyba91 I think you marked "pybytes" before. "Stable" is the basic version.

[szyba91]

@robert-hh I've noticed that FiPy is getting stack when I'm uploading code. Now i uploaded the simple RGB led blink and I can see the result but it is also stucking:
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c

After last command I can't see the REPL, firmer update helps but it seams that code had been uploded correctly.

[robert-hh]

@szyba91 When you upload code in main.py that will run infinitely, you will not get a REPL prompt. This prompt will be presented AFTER main.py is finished.
Edit: During boot, roughly the following steps are executed.

1. Initialize the device
2. Run _boot.py from frozen bytecode
3. Run _main.py from frozen bytecode
4. Run /flash/boot.py from the filesystem
5. Run /flash/main.py from the filesystem
6. Start REPL and show it's prompt.

[szyba91]

@robert-hh said in Exp Board 2.0 serial communication problem:

During boot, roughly the following steps are executed.

But it isn't normal that after uploading code I can't reach REPL prompt ? Because its happnes.

[robert-hh]

@szyba91 That depends on what is in the main.py you just uploaded. And if you upload with ftp, the REPL prompt stays until evetually you reset the device, at whih time the normal sequance is executed (see below).
Since I do not know what Pymakr/VSC does, it may lock the device or force a safe boot, such that it requires a hard reset to run again with the intended sequence.

[szyba91]

@robert-hh Could you provide me some information about your tools to programe fipy? What I've know you have Filezilla and using FTP serever and simple terminal like PuTTY aslo.

Is there any manual how set up this step by step ? I've been trying to folow the PyCom doucumentation but When i try to connect to 192.168.4.1 is unreachable.

How can i uplode the code in your way without using Atom or VSCode ?

[robert-hh]

@szyba91 For connecting via FTP, you have also to connect "the WLAN wire", meaning, your PC has either to attach to the access point created by the FiPy, or the FiPy has to join the WIfI network you are using with the PC.
By default, the FiPy creates an Access point with the name <forgot the name> and the password "micropythoN". When you attach to that, the FiPy assignes an IP address to your PC and is itself available with the IP address 192.168.4.1. You can then ftp to that address.
For the FiPy to acess your WiFi network it requires a short script in your FiPy's boot.py or main.py. This is from the examples & should work.

from network import WLAN
wlan = WLAN(mode=WLAN.STA)

nets = wlan.scan()
for net in nets:
    if net.ssid == 'mywifi':
        print('Network found!')
        wlan.connect(net.ssid, auth=(net.sec, 'mywifikey'), timeout=5000)
        while not wlan.isconnected():
            machine.idle() # save power while waiting
        print('WLAN connection succeeded!')
        break

The trick is to get that into the device. You can enter them manually into the REPL prompt. The required statements are:

from network import WLAN
wlan = WLAN(mode=WLAN.STA)
wlan.connect('myssid', auth=(WLAN.WPA2, 'mywifikey'), timeout=5000)
print("WLAN connected: ", wlan.isconnected())

[robert-hh]

@robert-hh Sorry, the AP password is "www.wipy.io"

[szyba91]

@robert-hh I'm trying to use enter your second idea with manuall cammands. Res Result : WLAN connected: False

I've change the myssid to my real network ssid and same with key. I've try with quotes and without quotes and its the same.

[robert-hh]

@szyba91 You need the quotes. Did you get any errors with the commands? What happens if you redo the wlan.isconnected() later?
I assumed the security sertting of your network is WPA2. It may be different.

[szyba91]

@robert-hh Its WPA2 Personal (I've read this from WIndows netowrk properties) Should I change it ?

As for redo: You mean instead of using wlan.connect('vnet-47DA1E', auth=(WLAN.WPA2, '89050914123'), timeout=5000)

use this : wlan.isconnected() ?

[robert-hh]

@szyba91 Then WPA2 is OK. No. Do not change the commands. wlan.isconnected() just checks, whether a connection exists. Making the connection can sometimes take some time, longer than the 5 seconds. You may also just issue the command
wlan.connect('vnet-47DA1E', auth=(WLAN.WPA2, '89050914123'))
and then after some time check with wlan.isconnected(), whether the connection was made.

[szyba91]

@robert-hh Result of wlan.isconnected() is "True"