Search found 111 matches

by blubb
Mon Oct 16, 2017 4:56 am
Forum: ESP8266 HDK
Topic: Is there a serial number or unique ID in the chip
Replies: 10
Views: 30362

Re: Is there a serial number or unique ID in the chip

Chip id is only 24 bit, so if more than 16.8 million chips have been manufactured, it cannot be unique. ;)
by blubb
Sat Oct 14, 2017 8:46 pm
Forum: ESP8266 SDK
Topic: GPIO0 and GPIO2 flashing / gpio_init() mystery
Replies: 2
Views: 1182

GPIO0 and GPIO2 flashing / gpio_init() mystery

Hi, for a project I am using the very simple ESP-01 modules. I use the UART for communication with another uC. This is all fine. Now I still have two free pins: GPIO0 and GPIO2. I want to use them to display the current WiFi status. I know these pins have to be high during boot, so I wired two LEDs ...
by blubb
Sat Oct 14, 2017 8:34 pm
Forum: ESP8266 SDK
Topic: UART0 Receive Overflow [RX OVF!!]
Replies: 2
Views: 1091

Re: UART0 Receive Overflow [RX OVF!!]

I have no clue, but the first thing I'd try is to raise the CPU frequency to 160 MHz. Maybe the ESP is simply to slow to handle all data in time, so the buffer fills up faster than it can be processed.
The second thing I'd try is to lower the baud rate (in the sender and receiver of course).
by blubb
Fri Oct 13, 2017 4:54 pm
Forum: ESP8266 SDK
Topic: Changing the currently running user binary
Replies: 3
Views: 1338

Re: Changing the currently running user binary

Yeah, but only if the new bin does not start at all. In the example I mentioned above, this wouldn't help.
by blubb
Fri Oct 13, 2017 7:04 am
Forum: ESP8266 SDK
Topic: Changing the currently running user binary
Replies: 3
Views: 1338

Changing the currently running user binary

Hi, there are various boot modes which can be chosen by different GPIO voltage levels. Is there also a way to change the currently running user binary? Let's assume I use OTA firmware updates. One day I accidentally upload a new version which has broken OTA support. Ooops. Now I cannot correct my mi...
by blubb
Thu Oct 12, 2017 5:56 pm
Forum: ESP8266 SDK
Topic: Invalid command in system_get_os_print
Replies: 3
Views: 1318

Re: Invalid command in system_get_os_print

I will download and compare the binary next time the problem occurs. It is so rare, it did not occur since I wrote my first post. But I doubt it has to do with binary corruption. There are checksums and also the exception always happens in system_get_os_print and nowhere else. My guess is that there...
by blubb
Thu Oct 12, 2017 12:32 am
Forum: ESP8266 SDK
Topic: AP caching in station mode
Replies: 3
Views: 1683

Re: AP caching in station mode

Is there a way to clear the cache without using system_restore (which clears pretty much everything and requires a restart)?
by blubb
Wed Oct 11, 2017 5:11 pm
Forum: ESP8266 SDK
Topic: AP caching in station mode
Replies: 3
Views: 1683

Re: AP caching in station mode

Ah, ok. I have to do the switching myself. I thought ESP looked for the right AP automatically on boot.

Thanks!
by blubb
Wed Oct 11, 2017 7:43 am
Forum: ESP8266 SDK
Topic: AP caching in station mode
Replies: 3
Views: 1683

AP caching in station mode

Hi, I have a question regarding the AP cache for station mode. I understand that ESP8266 can cache up to 5 APs is was successfully connected to. The SDK says: wifi_station_ap_number_set Sets the number of APs that will be cached for ESP8266 Station mode. Whenever ESP8266 Station connects to an AP, i...
by blubb
Wed Oct 11, 2017 4:39 am
Forum: ESP8266 SDK
Topic: WPS: No way to get key after successful connection
Replies: 2
Views: 1246

Re: WPS: No way to get key after successful connection

I have no experience with the AT firmware, but isn't the data for a successful connection saved? Your module should be able to reconnect after a powercycle.
To force being offline, you could use NULL_MODE. With the NONOS SDK I'd just do
wifi_set_opmode(NULL_MODE);

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