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JAndrassy / WiFiEspAT

Arduino networking library. Standard Arduino WiFi networking API over ESP8266 or ESP32 AT commands.
GNU Lesser General Public License v2.1
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Robotdyn Uno WiFi R3: ESP8266 - SD card fails when WiFi is connected #100

Closed marcrdavis closed 1 year ago

marcrdavis commented 1 year ago

Hi - having an issue with the library on a Robotdyn Uno WiFi R3: ESP8266 board. Wifi by itself works fine; SD card by itself works fine. After Wifi has made a client connection the SD card is unable to assert itself on the SPI bus (Wifi and SD have different cs pins). Not seeing this problem on the SONGHE MEGA2560 + WIFI R3 (ESP8266). Thought it might be bad hardware but it is failing the same way on multiple boards. If I switch the Wifi Library to WifiESP (AT Version) the SD card works (but I am not a fan of the performance of this library).

Any thoughts on what could be going wrong or how to fix? Thanks!

Marc

JAndrassy commented 1 year ago

it is the problem with the available SRAM. the SD library needs a 512 bytes buffer in the 2kB SRAM of Uno. the WiFiEspAT library allocates at runtime at least two 32 bytes buffers.