TM4C1294NCPDT: 7 Segment

Ray Vincent Aranzaso

Part Number: TM4C1294NCPDT

Hi,

Good Day.

How to do two digit seven segment display multiplexing in TM4C1294NCPDT.

Customer have a keypad code, he want to display the key pressed number in two digit seven segment display but display is showing flickering.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

over 3 years ago

0 Charles Tsai over 3 years ago

TI__Guru**** 191906 points

Hi,

How is the keypad connected to the MCU through what interface? You should be able to drive the 7-segment display by GPIO. Although we don't have a 7-segment example, but I find this link with the example. https://create.arduino.cc/projecthub/aboda243/get-started-with-seven-segment-c73200

0 Ray Vincent Aranzaso over 3 years ago in reply to Charles Tsai

TI__Mastermind 18180 points

Hi Charles,

Good Day. Please see below the response of our customer to your reply. Thank you very much.

I have interfaced keypad with uart
I have connected seven segment to gpio port only .the segment is getting displayed but there is some delay issue it's flickering
I am using two digit seven segment through multiplexing

Best Regards,

Ray Vincent

0 Charles Tsai over 3 years ago in reply to Ray Vincent Aranzaso

TI__Guru**** 191906 points

Hi,

I think the best way to debug is to look at the scope capture of the signals between GPIO and the 7-segments. If you are driving two 7-segments through multiplexing, you need to make sure you have some type of latch on the board that keeps one segment steady when multiplexing out to another segment. Or you need to use two GPIO ports in parallel instead of multiplexing.

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TM4C1294NCPDT: 7 Segment