Serial Help

Archiver

TC-

I'd try storing the 7-segment patterns in EEPROM, then select the
correct pattern in a subroutine according to the values received.
Something like:

seven_seg_data DATA $30,$6D,$79,...,$00 '0,1,2,...,blank
value VAR BYTE 'ASCII 0-9,A-F,blank


vfDisplay:
DEBUG CR,"Value received: ", value
LOOKDOWN value, [noparse][[/noparse]"0", "1", "2", ... "D", "E", "F", " "],value
DEBUG CR,"Index value from LOOKDOWN: ", DEC value
READ seven_seg_data + value, value
DEBUG CR,"7-segment value: ", BIN7 value
SHIFTOUT cpin,dpin,mode,[noparse][[/noparse] value\7 ]
RETURN


The DEBUG statements let you see what's going on (i.e., where I
goofed up).

Did you get your tach working and would you care to share the
solution with us?

Steve

On 22 Apr 01 at 3:50, aconti@n... wrote:

> Hello All,
>
> I am making a Display for my car, I am using the stock VF displays.
> I found a driver that works. The driver that I have is a 32-Bit
> serial- input latched driver. I nead a BS2 to do the same thing as
> the MAX7219 with out the multiplexing. Recive a value (0-9,A-F,&
> space) then turn on the right segment...

Archiver

Hello All,

I am making a Display for my car, I am using the stock VF displays. I
found a driver that works. The driver that I have is a 32-Bit serial-
input latched driver. I nead a BS2 to do the same thing as the
MAX7219 with out the multiplexing. Recive a value (0-9,A-F,& space)
then turn on the right segment.

Exp:
SEGMENT abcdefg
for 1= %0110000
for 2= %1101101
for 3= %1111001
ect.

I would use the MAX, But since I can not use the multiplexing. I
would nead 1 AND Gate,1 Invertor, and 1 display driver just for one
segment. That is to meny parts for 116 segments. When I only nead 4
of the drivers that I have.

I know I would use the SHIFTOUT camand but how would I make it do
what I want?

Thanks :-)
TC

PS. If it is any help, here is the driver that I am using
http://www.allegromicro.com/datafile/6818.pdf

Archiver

TC-
I'd try storing the 7-segment patterns in EEPROM, then select the
correct pattern in a subroutine according to the values received.
Something like:
seven_seg_data DATA $30,$6D,$79,...,$00 '0,1,2,...,blank
value VAR BYTE 'ASCII 0-9,A-F,blank

vfDisplay:
DEBUG CR,"Value received: ", value
LOOKDOWN value, [noparse][[/noparse]"0", "1", "2", ... "D", "E", "F", " "],value
DEBUG CR,"Index value from LOOKDOWN: ", DEC value
READ seven_seg_data + value, value
DEBUG CR,"7-segment value: ", BIN7 value
SHIFTOUT cpin,dpin,mode,[noparse][[/noparse] value\7 ]
RETURN

The DEBUG statements let you see what's going on (i.e., where I
goofed up).
Did you get your tach working and would you care to share the
solution with us?
Steve
On 22 Apr 01 at 3:50, aconti@n... wrote:
> Hello All,
>
> I am making a Display for my car, I am using the stock VF displays.
> I found a driver that works. The driver that I have is a 32-Bit
> serial- input latched driver. I nead a BS2 to do the same thing as
> the MAX7219 with out the multiplexing. Recive a value (0-9,A-F,&
> space) then turn on the right segment...


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