Texas Instruments CC2511 - Manual (Page 7)

CC2511 Dongle
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Figure 4: Recommended debug connector layout (Top view)
Figure 4 shows the required signal for a minimum connector layout.
Figure 5: SmartRF04EB debug connector for debugging
CC2511 Dongle / other external target systems
5.1 Debugging USB firmware
When writing and debugging USB firmware one should remember that when Windows (or
another OS) detects a USB device it will assume that it works in accordance with the USB
specification. During debugging this might not be the case. Breakpoints may stop the
execution of code on the CC2511 Dongle and firmware under development may not be
completed or error free. This may lead to the PC disconnecting the CC2511 Dongle and
turning off or toggling its power supply. In some cases Windows (or the OS in use) may crash
or misbehave. Hence breakpoints should be used with caution.
Obviously inserting and using breakpoints in the firmware during debugging will be extremely
useful to pinpoint bugs and follow code execution. And they can and should be used. But they
will also stop the code execution on the CC2511 and may cause the device to act in conflict
with the USB specification. This can lead to the PC disconnecting the CC2511 Dongle,
sending a USB reset or worst case the operating system may crash.
If the firmware contain bugs that make the PC disconnect the CC2511 Dongle it may be
necessary to disconnect the USB cable, and power the CC2511 Dongle from the
SmartRF04EB in order to reprogram it.
1. GND 2. VDD
3. DC 4. DD
7. Reset_N
SWRU082 Page 7 of 24