{"id":13706,"date":"2023-01-25T14:31:23","date_gmt":"2023-01-25T09:01:23","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=13706"},"modified":"2023-08-19T14:28:07","modified_gmt":"2023-08-19T08:58:07","slug":"microcontroller-embedded-c-programming-lecture-167-flowchart-for-implementation","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/microcontroller-embedded-c-programming-lecture-167-flowchart-for-implementation\/","title":{"rendered":"Microcontroller Embedded C Programming Lecture 167| Flowchart for implementation"},"content":{"rendered":"
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Flowchart for detecting key press events in the keypad<\/strong><\/span><\/strong><\/h1>\n
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In this article, let’s explore the flowchart for detecting key press events<\/a> in the keypad.<\/span><\/p>\n

For this exercise I’ll be considering PD8, PD9, PD10, and PD11, these are column GPIOs;   PD0 to PD3, these row GPIOs.<\/span><\/p>\n

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Figure 1. Connection<\/span><\/figcaption><\/figure>\n

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So, if you are using the STM32 discovery board, then you can definitely use this IOs, because these are free. If you are using some other board, please investigate what are the IOs you can use with this exercise. You need 8 free IOs. So, you have to investigate your board using the user manual of your board. <\/span> <\/span><\/p>\n

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Detecting key press event in Keypad Flowchart<\/b><\/span><\/p>\n

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Figure 2. Flowchart<\/span><\/figcaption><\/figure>\n

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Figure 3. Flowchart<\/span><\/figcaption><\/figure>\n

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Look at the Flowchart. The first two steps are initialization. <\/span><\/p>\n