Two issues:
1) http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/t/140599.aspx notes that the docking station signal names do not correspond to the signal names on the control card for the F28035- they don't for the F28069 either. Instead, the following chart must be used:
Pin Processor Docking station
# signal name signal name
30 GPIO 40 GPIO 48
31 GPIO 42 GPIO 84
68 GPIO 44 GPIO 59
32 GPIO 50 GPIO 86
42 GPIO 51 GPIO 87
20 GPIO 54 GPIO 60
70 GPIO 55 GPIO 61
22 GPIO 56 GPIO 62
72 GPIO 57 GPIO 63
Also, note that pins GPIO 52-53 are not brought out to the interface and that GPIO 35-39 exist but are labelled as JTAG lines
2) Having successfully run the SCI echoback example with an F28027 controlCARD onto the docking station port J3, I expected no problems when I replaced it with an F28069 controlCARD and ran the '69 SCI echoback example program. Having spent most of Friday with no communication whatever, I checked the schmatics and discovered that while the F28027 controlCARD routes SCIA to pins GPIO 28 and 29 through an isolator and an RS-232 driver and onto pins 2 and 52, the F28069 controlCARD does not do so: it does not provide RS-232 output, and there is nothing at all connected to pins 2 and 52. I will try hooking these signals up myself, but it sure would have been nice to have known this before wasting a day. Does experimenter kit http://www.ti.com/tool/tmdxdock28069 have a different docking station? Per http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/t/155426.aspx I verified that I have an XDS100v1 with the FT2232D part.
Bruce Bassett
