I’ve been using Beaglebone Black Wireless OK for almost 2 months, until recently where I ran into an issue with the WiFi modem not working at all. I’ve used bone-debian-8.6-iot-armhf-2016-11-06-4gb.img
What happens is: we load our application that uses the WiFi WL1835MOD on the board & everything seems to be fine for a while, both BL & WL LEDs turn on. After we run the application for maybe 10 min. to do some GPIO/ADC measurement then restart the system the WiFi chip stops & doesn’t turn ON at all. Both LEDs are Off at this stage.
I’ve checked the 3.3V_WiFI & 1.8V_WIFI voltage rails and they all seem to be fine as expected. However, The WIFI_EN signal which is connected to pin#40 “WLAN_EN” on the WiFi chip, which is also available at the gate of T3 MOSFET has 0V, this means the microprocessor is not turning the modem on for some reason.
This happens to 4 out of 6 boards and that is really high.
We tried to reflash & reloaded our original image to start fresh but again the modem doesn’t turn ON because WIFI_EN signal is still turned off.
The same thing happens to the Bluetooth, it is OFF & BT_EN is at 0V.
We’re using a 5VDC supply rated for 2.4A. The boards are brand new & never used before.
Your feedback is highly appreciated.