为什么4*4键盘的getkbd()的在bascom仿真时按键不起作用，返回值总是15？【恢复】
马老师，请问为什么4*4键盘的getkbd()的在bascom仿真时按键不起作用，返回值总是15？我使用的版本是1.11.9.1，即使是help中的例子也一样。 我准备给初中生开设单片机课程，需要使用bascom，否则小孩子学不懂啊。 你是玩玩的，还是准备踏踏实实的学门技术，如果是后者的话，建议你学习使用C语言的开发平台。 源程序：$regfile = "m48def.dat"
$crystal = 4000000
Config Lcdpin = Pin , Db4 = Portb.4 , Db5 = Portb.5 , Db6 = Portb.6 , Db7 = Portb.7 , E = Portc.3 , Rs = Portc.2
Config Lcd = 20 * 2
$hwstack = 32
$swstack = 10
$framesize = 40
Config Kbd = Portd
Dim D As Byte
Do
D = Getkbd()
Cls
Waitms 50
Lcd D
Waitms 50
Loop
End I found some useful matairl in http://www.dontronics.com/basc-avrcf.html.It should resovle your problem.
From: Ian Thomson
I have been having a rotten job of simulating a 16 button keypad in Bascom Avr... Just couldn't seen to be able to get a value into the variable assigned tothe getkbd() function. After a lot of brain busting I think I have the problem solved. So for those that are having the same problem I present my solution for your general use.(See text below)
Simulating a keypad in the Bascom Avr Simulator .............
Before running your code in the simulator Turn ON all of the Inputs Under Hardware Simulation for the port that the keyboard is attached to. ( All of the green Led's ) This mimics a keyboard with no keys pressed.
When no key press is simulated then the variable assigned to the getkbd() in Bascom will have a value of 16...To simulate a key press You will need to pause simulation and use step by step for the key press simulation to work.
To simulate a key press,Turn Offthe inputs on the port pins for the value required... then step through your code until the value is passed into the getkbd() variable. ( You can watch the variable under the variables Tab to make sure it has worked. ) Then Turn both of the inputs Back On to simulate the key being released.
Port -> 7 6 5 4 3 2 1 0 Value Returned
Pins
| Dec Hex
|
No ---> on on on on |on on on on 16 10
Key on on on off|on on on off 0 0
Pressed on on on off|on on off on 1 1
on on on off|on off on on 2 2
on on on off|off on on on 3 3
on on off on |on on on off 4 4
on on off on |on on off on 5 5
on on off on |on off on on 6 6
on on off on |off on on on 7 7
on off on on |on on on off 8 8
on off on on |on on off on 9 9
on off on on |on off on on 10 A
on off on on |off on on on 11 B
off on on on |on on on off 12 C
off on on on |on on off on 13 D
off on on on |on off on on 14 E
off on on on |off on on on 15 F
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