The kart's Bluetooth boards hold a SOC which is programmed as an RS232 modem. The also comprise a legacy RS232 port.
The long side single 18-pin row connector is used to program the Bluetooth module.
The 10-pin header connector corresponds to the RS232 port. A flat cable can be crimped with a female header in one side and a female RS232 connector on the other.
An unmounted 4-pin single row connector provides a differential stereo audio output.
Connection between FPGA and Bluetooth module
Both components connect via:
- a serial port link
- an 8-bit parallel port
The parallel port is driven by the Bluetooth module:
- Parallel port bit 0 is brought high when the Bluetooth module has successfully achieved a connection, e.g. with a mobile phone.
Additionally, the FPGA:
- pulses the BT
reset_nline at power-up
- drives the BT
VReg_enline high after the reset
The Kart controller design leaves 4 free pins. Pins 1 to 2 are foreseen for test outputs. Pins 3 and 8 are foreseen for test outputs with a divider by 2 for pulses.