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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Need a sample code to drive a SAA1064 |
 Posted: Wed Jan 11, 2006 12:50 pm |
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Did anybody has a library for this chip
and some sample code
Maybe for driving four 7 segment displays
( counting from 1 to 9999 as example) |
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Kenny
Joined: 07 Sep 2003
Posts: 173
Location: Australia
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| Posted: Thu Jan 12, 2006 12:59 am |
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This is what I use. There may be a better way to do it.
HTH
| Code: |
#include <16F876.h>
#use delay(clock=16000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,ERRORS)
#use i2c(master,sda=PIN_C4,scl=PIN_C3,FORCE_HW)
#fuses HS,NOWDT,NOLVP,PUT,NOPROTECT,BROWNOUT
#include "saa1064.h"
int16 count = 0;
void main(void)
{
// Display 'On' on display with SAA1064 ADR pin tied to Vee
send_saa1064_msg(LED_ADDR0,LED_CONTROL,on_);
delay_ms(1000);
send_saa1064_msg(LED_ADDR0,LED_CONTROL,blank_);
delay_ms(300);
while(1)
{
send_saa1064_num(LED_ADDR0,LED_CONTROL,count);
if(++count == 10000) count = 0;
delay_ms(100);
}
}
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saa1064.h
| Code: |
// Driver for SAA1064 i2c to multiplexed four-digit, seven-segment led display
// SAA1064 write addresses set by connecting pin1 (ADR) to different voltages
#define LED_ADDR0 0x70 // ADR to Vee
#define LED_ADDR1 0x72 // ADR to 3/8 Vcc
#define LED_ADDR2 0x74 // ADR to 5/8 Vcc
#define LED_ADDR3 0x76 // ADR to Vcc
// Control bits
// C0 = 0 = static mode C0 = 1 dynamic mode
// C1 = 0/1 digits 1 and 3 are blanked/not blanked
// C2 = 0/1 digits 2 and 4 are blanked/not blanked
// C3 = 1 all segments outputs turned on for segment test
// C4 = 1 adds 3ma to segment output
// C5 = 1 adds 6ma to segment output
// C6 = 1 adds 12ma to segment output
// C7 n/a
#define LED_CONTROL 0x27 //Dynamic mode 6mA
// 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
// Some non-numeric characters
//0x00,0x77,0x7C,0x39,0x5E,0x79,0x71,0x36,0x04,0x38, // blank,A,b,C,d,E,F,H,i,L
//0x54,0x5C,0x73,0x50,0x6B,0x1C,0x6E,0x40,0x08 // n,o,p,r,S,u,y,-,_
// Message examples
byte const blank[4] = {0x00,0x00,0x00,0x00};// Blank display
byte const err[4] = {0x00,0x79,0x50,0x50}; // Err
byte const on[4] = {0x00,0x00,0x3F,0x54}; // On
byte const off[4] = {0x00,0x3F,0x71,0x71}; // OFF
enum {blank_,err_,on_,off_};
//--------------------------------------------------------------------------
// Sends number to four-digit led display via SAA1064 (0 to 9999)
void send_saa1064_num(int8 addr,int8 control,int16 num)
{
int8 j; // Digit index
int8 led_data[4]; // Ram array for segment data
int16 temp16;
// Get led segments for all four digits. Don't need to divide to get units.
temp16 = num;
j = 0;
while (j <= 3)
{
if (j != 0) temp16 /= 10;
led_data[j] = seg_table[temp16 %10];
j++;
}
// Do leading zero blanking
if (num<1000) led_data[3] = 0x00;
if (num<100) led_data[2] = 0x00;
if (num<10) led_data[1] = 0x00;
// Add decimal point if required
//led_data[2] |= 0x80;
// Send led segments
i2c_start();
i2c_write(addr); // Send SAA1064 address
i2c_write(0x00); // Send instruction byte. Zero is control reg.
i2c_write(control); // Send control byte
// Auto increment applies for digit data. Have to send out digits in reverse
// because most significant digit is 1st digit.
for (j=4;j>=1;j--)
i2c_write(led_data[j-1] & 0xff);
i2c_stop();
}
//---------------------------------------------------------------------------
//Sends message to led display via SAA1064
void send_saa1064_msg(int8 addr,int8 control,int8 msg)
{
int8 j;
int8 led_data[4]; // Ram array for segments
// Get segments for message.
switch (msg)
{
case blank_:
for(j=0;j<=3;j++)
led_data[j] = blank[j];
break;
case err_:
for(j=0;j<=3;j++)
led_data[j] = err[j];
break;
case on_:
for(j=0;j<=3;j++)
led_data[j] = on[j];
break;
case off_:
for(j=0;j<=3;j++)
led_data[j] = off[j];
break;
default:
for(j=0;j<=3;j++)
led_data[j] = blank[j];
break;
}
// Send led segments
i2c_start();
i2c_write(addr); // Send SAA1064 address
i2c_write(0x00); // Send instruction byte. Zero is control reg.
i2c_write(control); // Send control byte
for (j=0;j<=3;j++)
i2c_write(led_data[j]);
i2c_stop();
}
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Last edited by Kenny on Sun Jan 15, 2006 8:45 pm; edited 1 time in total |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Thu Jan 12, 2006 3:59 am |
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| Thanks, that was what i need |
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JohnLeung
Joined: 18 May 2004
Posts: 15
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| Driving 4 7-segment by PIC itself |
| Posted: Sun Jan 15, 2006 10:21 am |
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Hi [spam]
Since you've already got the SAA1064 code, please regard this information as a reference only. I have done similar project in the past, however, since SAA1064 was too difficult to get in my country, so I have tried hard to find alternatives and finally, I am using the PIC itself to do the following:
1. drive 9 7-segment displays by a single PIC 16F877a.
2. Provide DING DONG alert audible tone.
3. Receive and transmit RS232 message to-and-from an operator console.
Please look at the CCS Code library section or take a look at my web page at www.emed-technologies.com. I have put all schematics and source code in there under the PIC section.
John |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sun Jan 15, 2006 10:25 am |
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Thanks JohnLeung
I have seen it |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sun Jan 29, 2006 3:17 pm |
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How can i change that routine to display on the first 2 segments the seconds and on the last 2 segment the minutes of a pcf8583
....
void Gettime ()
{
std = read_rtc(0x04)&0x3F; // Stunden vom PCF8583 werden gelesen
min = read_rtc(0x03); // Minuten vom PCF8583 werden gelesen
sek = read_rtc(0x02); // Sekunden vom PCF8583 werden gelesen
zeit[0]=hexd2decD(sek); // Die aktuellen Sekunden werden in den Array gespeichert
zeit[1]=hexd2decD(min); // Die aktuellen Minuten werden in den Array gespeichert
zeit[2]=hexd2decD(std); // Die aktuellen Stunden werden in den Array gespeichert
}
.... |
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