The question for me would be how the CYW43 chip ties together internally, what exactly each 'power enable' controls. I haven't studied the datasheet but there is a block diagram -
BT is on the left, WLAN is on the right, and there is a third CPU section at the top, not shown here, which interfaces with both.
The interface to the host (RP2) is in the WLAN section and it's not clear if you would need WL_ON to be able to communicate with the host, to upload the main firmware, to upload the BT firmware. Or do BT_ON and WL_ON only control parts of the chip, the respective radios only perhaps.
And does it support BT without WLAN, or are the options 'Neither', 'WLAN' and 'WLAN plus BT' as you suggest ?
The other questions would be whether the firmware provided would work for BT if the WLAN were off, and what might have to change with the driver upload code in Pico SDK for cases where it isn't able to just set GPIO23 and power-up both BT and WLAN.
I think you'd have to study the datasheet and put it to the test to be entirely sure.
BT is on the left, WLAN is on the right, and there is a third CPU section at the top, not shown here, which interfaces with both.
The interface to the host (RP2) is in the WLAN section and it's not clear if you would need WL_ON to be able to communicate with the host, to upload the main firmware, to upload the BT firmware. Or do BT_ON and WL_ON only control parts of the chip, the respective radios only perhaps.
And does it support BT without WLAN, or are the options 'Neither', 'WLAN' and 'WLAN plus BT' as you suggest ?
The other questions would be whether the firmware provided would work for BT if the WLAN were off, and what might have to change with the driver upload code in Pico SDK for cases where it isn't able to just set GPIO23 and power-up both BT and WLAN.
I think you'd have to study the datasheet and put it to the test to be entirely sure.
Statistics: Posted by hippy — Wed Jul 09, 2025 9:02 am