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PS2 Scan codes with 16F877

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tiwari.sachin

New Member
Hello

I am trying to interface PS2 keyboard to 16F877. I am a bit confused with the scan code of PS2.

I have attached the file of the scan codes i have used.
This seems to work fine.

But when i searched through net for scan code, the standard scan codes seem to be different. for 'a' scan code is 0x1C but i have used 0x38. for 'b scan code is 0x32 but i have used 0x4C and so on... The scan code i have used has also been found on net.

I am confused. which one is correct format. I have this thing working but the scan codes are different.

I have also attached the code. Kindly let me know what is it that i am doing wrong. I am using a keyboard from TechCom. Are the scan codes that i am using correct.
 

Attachments

  • ps2keyboard.c
    1.3 KB · Views: 155
  • main.c
    574 bytes · Views: 142
  • ps2keyboard.h
    915 bytes · Views: 159

Gayan Soyza

Active Member
PS2 Scan code 2 is the standard.
Ex:
For Character "A" make code = 1C break code = F0,IC

In your code you did Keyboard to host communication?
Or Host to Keyboard communication?
 
Last edited:

tiwari.sachin

New Member
Gayan Soyza.

I know there is a standard code. The table that i have was also downloaded. I will check again and see whats wrong.

As of now i am doing keyboard to host communication




PS2 Scan code 2 is the standard.
Ex:
For Character "A" make code = 1C break code = F0,IC

In your code you did Keyboard to host communication?
Or Host to Keyboard communication?
 
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