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A PC is connected to one CC2540USB dongle running the HostTestRelease project (included with our SDK). The PC also has a UART connection with the Device Under Test (DUT). When the DUT is powered up, it must have one GPIO held the opposite of what it normally would be held. For example, if the GPIO normally has a resistor tied to ground on the PCB, you would need to make sure that before powering up for test that the pin is connected high to VDD. In the application source code initialization function, be sure that the following line of code is included:
#include “hci.h” if( GPIO == VDD ) // change the if statement to match the HW setup on the PCB { HCI_EXT_EnablePTM(); } With this code in the application and with the GPIO held high, the device will power up and the HCI_EXT_EnablePTM function will get called, which exposes the UART pins to enable test commands. As far as the USB dongle goes, you will need to have the driver loaded. The driver is included with our stack at C:\Texas Instruments\BLE-CC254x-1.2\Accessories\Drivers. This driver will create a Windows COM port for communication with the dongle. You will also have another Windows COM port for UART communication with the DUT. For communication with these devices, you will want to use the following port settings:
