Check that you have a full ground plane underneath the crystal.
We has a similar problem with the debug uart lines going under the crystal.
Also try contacting espressif directly via email. Their hardware support team is great and really helpful.
Search found 79 matches
- Tue Mar 13, 2018 8:13 pm
- Forum: General Discussion
- Topic: Wifi / Bluetooth Problems with custom Board
- Replies: 6
- Views: 11085
- Wed Jan 24, 2018 12:49 am
- Forum: ESP-IDF
- Topic: BLE communication between EPS32 and Mobile phones
- Replies: 1
- Views: 4585
Re: BLE communication between EPS32 and Mobile phones
This can be achieved with some simple modifications to the gatt_server or gatt_server_service_table examples in the IDF. You will first need to set your interval to 20ms. You can set this with the following code: esp_ble_conn_update_params_t conn_params; //todo maybe turn this into malloc/free memcp...
- Mon Jan 08, 2018 6:45 pm
- Forum: General Discussion
- Topic: BLE mtu and iPhone compatibility
- Replies: 3
- Views: 7393
Re: BLE mtu and iPhone compatibility
Yes the BLE data length extension is supported.
Initially it will connect at an mtu of 23.
iOS will then automatically negotiate a larger mtu. in iOS 10+ the MTU will be 185. in 9 and lower it is slightly smaller (about 150..? but i am not sure).
Initially it will connect at an mtu of 23.
iOS will then automatically negotiate a larger mtu. in iOS 10+ the MTU will be 185. in 9 and lower it is slightly smaller (about 150..? but i am not sure).
- Wed Nov 22, 2017 2:34 am
- Forum: ESP-IDF
- Topic: unreliable wifi on custom hardware
- Replies: 2
- Views: 4749
Re: unreliable wifi on custom hardware
Just checking if anyone has any thoughts on this?
- Wed Nov 08, 2017 3:31 am
- Forum: General Discussion
- Topic: BLE connection parameters update
- Replies: 3
- Views: 12293
Re: BLE connection parameters update
The min an max connection interval are set by the BLE spec. The minimum is 6 (6*1.25 = 7.5ms). I cant remember the max off the top of my head. this is a function that i use to adjust the connection interval on the client side of my application void gatt_client_update_connection_params(uint8_t channe...
- Mon Nov 06, 2017 10:23 pm
- Forum: General Discussion
- Topic: How often should I update esp-idf?
- Replies: 2
- Views: 4091
Re: How often should I update esp-idf?
It does depend a little bit on what parts of the IDF you are using. If v2.1 has all the support you need, and you are looking for api stability etc, then sticking with a specific release of the IDF is a good plan. However if, like me, you need some of the features of the upcoming v3.0 if the IDF the...
- Sun Nov 05, 2017 8:35 pm
- Forum: Hardware
- Topic: What matching components should be used for the 5x5 QFN package?
- Replies: 9
- Views: 13828
Re: What matching components should be used for the 5x5 QFN package?
You should use a PI matching network (like that shown in the post above).
However please bare in mind that you will probably have to tune this network by altering the values of the conductors and capacitors depending on your circuit layout and antenna choice.
However please bare in mind that you will probably have to tune this network by altering the values of the conductors and capacitors depending on your circuit layout and antenna choice.
- Sun Nov 05, 2017 8:34 pm
- Forum: ESP32 Arduino
- Topic: VFD using MCPWM
- Replies: 1
- Views: 5143
Re: VFD using MCPWM
I am not sure what the ESP32 pwm hardware supports, But if it doesnt support dead time insertion etc, then going with a FET driver that has cross conduction (dead time) logic and a few other protection features might be a good path forward. Something like this from ST(or any other manufacturer, this...
- Sun Nov 05, 2017 8:28 pm
- Forum: General Discussion
- Topic: BLE notification transfer size
- Replies: 4
- Views: 11594
Re: BLE notification transfer size
You can use the long characteristic read/writes to support characteristics larger than the MTU size. The ble stack will then automatically split the characteristic up into multiple packets to be sent. However since a notifications (and indications) are only ever a single packet event, you can't use ...
- Tue Oct 24, 2017 7:18 pm
- Forum: ESP-IDF
- Topic: Notes on using Windows Subsystem for Linux with ESP-IDF
- Replies: 5
- Views: 10092
Re: Notes on using Windows Subsystem for Linux with ESP-IDF
I am not exactly sure what the failure mode was. It was about 2-3 months ago. I am not 100% sure it was line endings, it could have been something else. i just remember re-cloning m code and the idf using the WSL git to a new folder let me build. I have since mostly just relied on the pre-compiled t...