Max7221
Does anyone have code that works with the MAX7221 (8-digit LED
display driver) chip? I have tried the app kits code without success.
I'm only using two large LED (0.800"). Do I need some additional
circuitry because only 2 of the 8 digits are used?
This is the code I've been using (it should configure the chip and
display the number six):
<
>
DIN con 4
CS con 5
CLK con 9
Loop var byte
maxout var byte
pulse var bit
DIRS=%1111111111111111
pause 1000
shiftout DIN,CLK,1,[noparse][[/noparse]$0901\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0A0F\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0B00\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0C01\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0106\16]
pulsout CS, 3
end
<
>
Thanks!!
--Jeff
display driver) chip? I have tried the app kits code without success.
I'm only using two large LED (0.800"). Do I need some additional
circuitry because only 2 of the 8 digits are used?
This is the code I've been using (it should configure the chip and
display the number six):
<
>
DIN con 4
CS con 5
CLK con 9
Loop var byte
maxout var byte
pulse var bit
DIRS=%1111111111111111
pause 1000
shiftout DIN,CLK,1,[noparse][[/noparse]$0901\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0A0F\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0B00\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0C01\16]
pulsout CS, 3
shiftout DIN,CLK,1,[noparse][[/noparse]$0106\16]
pulsout CS, 3
end
<
>
Thanks!!
--Jeff
Comments
on the 7221? i.e., cathode on pin 11, segments on the correct pins,
ground to both pins 4 and 9, +5 on 19 and +5 through a resister on 18 to
set the voltage, et al.
-
Ian Bobbitt
When an error occures:
A novice user blames himself,
a normal user blames the computer,
a power user sighs and gets another cup of coffee.
KB9VEX
ICQ: 14106680
It said requires windows 95 or better, so I installed Linux.