Seven Segment interface with LPC1769

[vishakhadakhane]

Hello I am working on MCUxpresso IDE and want to interface 7-segment display with LPC1769. I am using 3-digit seven segment and my goal is to display 3 digits. I did some code using the APIs which are present in LPCopen's e.g. After flashing the code to target, 7. 7. 7. gets displayed after some delay and if I change the data e.g. if I pass other numbers like 0,1,2 ..... the same gets displayed(7.7.7.). Do we need to clear the data? And how to clear that? I tried to find the API in the example and I found Chip_GPIO_SetPortOutLow to make the whole port low. I am not getting where the fault is. Is there any sample seven segment example for MCUxpresso? I am attaching the code kindly help me. Thanks in advance!

[jeremyzhou]

Hi Vishakha Dakhane,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
Unfortunately, there's no similar demo in the LPCOpen library as you requested. Having a brief review of your code, I'd like to suggest you validate whether the status of GPIOs change as expect via multimeter firstly.

Have a great day,
TIC

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[vishakhadakhane]

Hello @jeremyzhou I am able to print 0 to 9 on a single digit but now I would like to print the numbers on all the three digits simultaneously . Can you please tell me how to do it? Thanks in advance!

[jeremyzhou · Accepted solution]

Hi Vishakha Dakhane,

Thanks for your reply.
For a 7-segment displayer, it usually has a common anode that would either connects to GND or Vcc.
So it's able to print the numbers on all the three digits simultaneously when these three common anodes are controlled by one signal like a pin's value.

Have a great day,
TIC

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