Hello,
this is my second try. I made my own board with CC3200 that is based on the wide voltage example in the datasheet. The components, e.h. the 40 MHz crystal are the type that was suggested in the datasheet.
I tried to programm my board via the launchpad. For this, I removed the jumpers for RXD and TXD on the launchpad, removed the jumper for the power supply of the cc3200 on the launchpad and made connections for GND, VBat, RXD and TXD to my board and tried with uniflash. I also removed the jumpers for the JTAG lines.
I do not get any response from the board. When I switch back to launchpad CC3200, it works.
So, we made some hardware measurements.
First was the crystal. On the launchpad, we can measure the 40 MHz signal. On my own board, we see a DC voltage of about 0.4 V + sawtooth pulses every 1.4 ms.
We find this pulses also on other IO-Pins, at the SOP pins, RXD, TXD and other GPIO pins.
We then checked the VDD pins. We get:
VDD_ANA1 : 1,3V
VDD_PA_IN: 1,3V
VDD_DIG1: 1,2V
VDD_DIG2: 1,2V
VDD_ANA2: 3,3V
VDD_RAM 1,2V
VDD_PLL: 1,2V
VIN_DCDC_ANA: 3,3V
VIN_DCDC_PA: 3,3V
VIN_DCDC_DIG: 3,3V
VIN_IO2: 3,3V
VIN_IO2: 3,3V
One idea is, that the ground may not be connected properly. But I think, in this case, the VDD voltages would not be 1.2 V which seems to be ok.
But, what can be the reason, why I find this 1.4 ms pulses on GPIO-pins and crystal.
best regards
Stefan
