STM32 GPIO: Mobile Keypad Interface
We previously interface Keypad with Atmel microcontroller. Now we interface keypad with STm32. We will interface STm32 with 3x4 matrix keypad. 4 rows which will be output pins and 3 columns which will be input with pull-up enable. Since the input pins are pull-up enable the default value is 1 and active with logic 0 to the pin. So our first step is to sequentially set & reset the rows. We will reset(0) one row at a time and other rows will be set(1). For example if we press 1 then row1 will be zero and column1 will get a value of 0. So our logic is whenever a switch will press the corresponding row and column will zero. Since there are 4 rows we will create a loop of 4 and read the input.......
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