It is taking around 30 to 45 seconds for our CC2564MODN to drive RTS low. Maybe this means something specific to a CC2564 expert. Any thoughts?
I would like to mention that our HCI_CTS is tied directly to ground. We don't plan to use hardware flow control.
Our power cycle is the following. I believe it meets the power up sequence explained in TI's wiki, however, I can't be sure because the Wiki doesn't list min and max setup/hold times for all relevant signals.
1) Board powers up, which supplies power to the 3.3V rail. At this point the Tiva C and CC2564MODN have 3.3V. All three are held at 0V: HCI_CTS, HCI_RX, nSHUTDOWN, CLK, 1.8V rail.
2) 500 ms later, the 1.8V rail is enabled and CLK starts clocking at 32.768KHz.
3) 5 ms later, nSHUTDOWN is driven to 1.8V. At this point, HCI_CTS is low (i.e. tied directly to ground) and HCI_RX is undefined.
Roughly 30 to 45 seconds after the above power up sequence the CC2564B drives the HCI_RTS pin low. (However, the wiki lists this much shorter at 100 milliseconds).
Any thoughts we be greatly appreciated. BTW, at this point there is no Bluetooth stack running.
