TMS320F280039: How to delay a signal using CLB

Bishlant Jiang

Part Number: TMS320F280039
Other Parts Discussed in Thread: C2000WARE

Dear Sir,

I want to delay a singnal like the pic show below, using CLB. The delay time is configurable, I think we must need a counter in CLB to count if the delay match. For the counter, it gives out ZERO, MATCH1 and MATCH2. and when it's a counter, it will counts up/down during the input signal is HIGH, in this case we can only get a clock of MATCH1/2. I don't know how to make the counter output low or high during it counts to delay time, and once when it match the reference(delay time), it outputs high or low.

Please point out that if I miss understanding the logic. thanks.

over 1 year ago

0 Omer Amir over 1 year ago

TI__Mastermind 30185 points

Hello Bishlant,

Your understanding is correct, you can use the serializer of the counters to shift in values and delay them according to another counter to determine when it gets pushed through either to the CPU (using the HLC) or as an output to another peripheral/pin using the CLB output (which requires an additional serializer counter).

You can refer to the How to Implement Customer Serial Interfaces Using the Configurable Logic Block (CLB) for a description of using the serializer to shift in/out bits. The directory C2000Ware_5_01_00_00\driverlib\f28003x\examples\clb has examples clb_ex31_tdm_serial_port and clb_ex22_serializer for some implementations of the serializer.

0 Bishlant Jiang over 1 year ago in reply to Omer Amir

Prodigy 90 points

Hi Omer,

I get it done by using FSM and counter.

Now i want to make the out0-3 output to GPIO0/1/2/3. I assume i should configure via the CLB output x-bar. i have a question here, I'm not sure what it mean like GPIO0/79. Is it GPIO0 or GPIO79? and i can't find GPIO2/3 here.

0 Omer Amir over 1 year ago in reply to Bishlant Jiang

TI__Mastermind 30185 points

Hello Bishlant,

If you select the drop-down from the CLB OUTPUTXBAR Peripheral field, you should see an option for "Any":

If you select this and select the drop-down on the CLB OUTPUTXBAR field below this, you should see what GPIO options are actually available given that you're not trying to use a specific CLB output XBAR: