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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| how to implement table lookup in this procedure? |
 Posted: Fri Feb 17, 2006 1:09 pm |
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My question is now how to implement this segment table in the below code= the bold text
It displays now only segments, but not correct numbers (0,1,2,3,4,5,6,7,8,9)
| Code: |
// Segment table (In hex: d.p.=80,g=40,f=20,e=10,d=08,c=04,b=02,a=01)
byte const seg_table[10] = {
0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F }; // 0,1,2,3,4,5,6,7,8,9
void saa1064_write_num(int8 addr,int8 control,int16 num) {
int1 leading=true;
int8 led_data[4];
int8 j;
int16 temp16;
for(j=0;j<3;j++) {
temp16=num/10;
led_data[j]=num-(temp16*10);
num=temp16;
}
led_data[3]=num;
for(j=3;j>0;j--) {
if (leading && led_data[j]==0)
led_data[j]=SEGMENT_CHAR_BLANK;
else
leading=false;
}
i2c_start();
i2c_write(addr);
i2c_write(SAA1064_REG_CONTROL);
i2c_write(control);
for(j=0;j<=3;j++)
i2c_write(led_data[j]);
i2c_stop();
} |
[/b] |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 17, 2006 2:31 pm |
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1. Create an array of digits that you want to display.
Each value in the digit array will be an integer from 0 to 9.
2. Use the digit array values as an index into the segment table.
Get the segment value that corresponds to the digit value.
This is why it is called a "look-up table".
3. When you get the segment values for all the digits, then
send them to the SAA1064. |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Fri Feb 17, 2006 2:34 pm |
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| PCM programmer wrote: | 1. Create an array of digits that you want to display.
Each value in the digit array will be an integer from 0 to 9.
2. Use the digit array values as an index into the segment table.
Get the segment value that corresponds to the digit value.
This is why it is called a "look-up table".
3. When you get the segment values for all the digits, then
send them to the SAA1064. |
Then is must change this code in the proc, but how??
| Code: | for(j=0;j<3;j++) {
temp16=num/10;
led_data[j]=num-(temp16*10);
num=temp16;
}
led_data[3]=num;
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Feb 17, 2006 2:42 pm |
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Can I tell you something about your style of using this forum ?
Your style disappoints most people.
That's why your posts sink down the list with no answers.
The problem is that you don't want to do any work.
You don't even try to solve the problem yourself, in any way.
As soon as you get a "live one" (someone who answers your post)
you immediately turn around and "dump code" on the person.
It's clear that you have not even looked at the code or thought
about a solution in any way.
We don't want to take your class for you, or do your work.
I gave you one more chance, when I answered you just now.
You disappointed me. I'm not going to do your work for you. |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Fri Feb 17, 2006 4:11 pm |
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Sorry PCM programmer,
but i am new in c programming and uC's
It is not as easy as i thought.
But i will try it tomorrow, hopes i can get it to work 
UPDATE
This work with lookup table, but now zero blanking
| Code: | // Segment table
byte const seg_table[10] = {
0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F }; // 0,1,2,3,4,5,6,7,8,9
void saa1064_write_num(int8 addr,int8 control,int16 num) {
int8 led_data[4];
int8 j;
int16 temp16;
for(j=0;j<3;j++) {
temp16=num/10;
led_data[j]=seg_table[num-(temp16*10)];
num=temp16;
}
led_data[3]=seg_table[num];
i2c_start();
i2c_write(addr);
i2c_write(SAA1064_REG_CONTROL);
i2c_write(control);
for(j=0;j<=3;j++)
i2c_write(led_data[j]);
i2c_stop();
} |
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Guest
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| Posted: Sun Feb 19, 2006 8:00 am |
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Since its Sunday, I'll give you a hint. Read PCM Programmer's post again carefully, especially Points 1 and 2. You did not do what he suggested. In fact, you're kind of doing the opposite.
Remember, the index to seg_table must be an integer from 0-9.
r.b. |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sun Feb 19, 2006 9:20 am |
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i have found it 
it works now, but it cost me several hours  |
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