I have a question about using http://hakshop.myshopify.com/products/serial-ttl-cable with WiTi. (I am an electrical engineer, but have never horsed around with USB-Serial connectors.)
I have done/seen the following:
- Connected Gnd, Tx, Rx between the pins of the USB-Serial connector and the WiTi in the obvious way. (Gnd -> Gnd, Rx -> Rx, Tx -> Tx)
- Installed the MacOSX driver for the adapter. (Silicon Labs 210x - http://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspx)
ls /dev/cu* shows the /dev/cu.SLAB_USBtoUART when it is inserted; removing the adapter causes its entry in
ls /dev/cu* to disappear
screen /dev/cu.SLAB_USBtoUART 57600 causes a new window to appear
- Nothing ever appears in the window, even if I reset the WiTi
I'm looking for advice for what to check next. Do Rx & Tx need to be swapped? Should I see log messages while the WiTi is booting? Thanks!
UPDATE: Yes, the Rx and Tx wires need to be swapped. They should be (Gnd -> Gnd, Rx -> Tx, Tx -> Rx). Pressing Return now elicits the busybox prompt and I'm on the air.