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The example shows the connection of a device from the dsPIC30F family to a standard PS/2 keyboard. It is important to note that all pins of the PS/2 keyboard connected to the dsPIC30F device are connected to the power supply by the pull-up resistors. The realization is carried out by using the mikroBasic compiler for dsPIC30F microcontrollers.
program ps2_test dim keydata, special, down as word main: ADPCFG=$FFFF keydata = 0 special = 0 down = 0 Ps2_Config(PORTC, 14, 13) Uart1_Init(9600) Uart1_Write_Text("You can type now!") ' Ready while TRUE if Ps2_Key_Read(keydata, special, down) <> 0 then if ((down<>0) and (keydata = 16)) <> 0 then Uart1_Write_Char(0x08) else if ((down<>0) and (keydata = 13)) <> 0 then ' Enter Uart1_Write_Char(13) Uart1_Write_Char(10) else if ((down<>0) and (special=0) and (keydata<>0)) <> 0 then Uart1_Write_Char(keydata) end if end if end if end if Delay_ms(1) ' debounce wend end.