My customer is seeing the below issue when trying to use the RT3 tool with their target platform connected to the SDMMC adapter board. When they use the SDMMC board and COM8 they are able to connect and control WL8. They can always connect to WL8 device via RT3 but can’t get the MAC FW version on their target HW.
Below are scope shots of the TI development board and their product on boot up.
This is how the TI WiFi Development board with plug in WiFi module looks on power up, 1 second.
Purple is 3.3V line from USB cable, blue is WiFi Enable line, yellow is IRQ line from WiFi module. IRQ is normally low after this. The transmit control works when the boot up looks like this. Transmit power can be turned On & Off, and the channel can be selected.
SP WiFi lines on power up, 4 seconds. SP not connected to the TI development board at this time.
Purple is 3.6V power, blue is WiFi Enable line, yellow is IRQ line from WiFi module.
The Enable line doesn’t rise high enough, only 0.28V.
To enter debug mode and allow transmit control the IRQ line must go high before the Enable line. Here it does but the Enable line isn’t high enough.
Transmit control is not possible when SP is connected to the TI program running on a laptop via a 1.8V USB dongle. We can connect but not control the channel and transmit.
SP WiFi lines on power up, same as previous scope shot but after 10 seconds.
Purple is 3.6V power, blue is WiFi Enable line, yellow is IRQ line from WiFi module.
At 5.5 seconds the IRQ toggles low and WiFi Enable goes high.
After 10 seconds the Enable and IRQ lines stay high, with occasional strobing on the IRQ.
To enter debug mode and allow transmit control the IRQ line must go high before the Enable line. Here the IRQ line drops low when the Enable line goes high. This may not be valid to enter debug mode.
Transmit control is not possible when SP is connected to the TI program running on a laptop via a 1.8V USB dongle. We can connect but not control the channel and transmit.
At boot when IRQ goes High, does it go low once the EN line goes high? Or is there a command sent to the module from the host to force it low?
When do the SDIO_Dx lines need to be disabled? Before the boot process, or are they needed for some basic commands at start up?
Thanks,
Charles
