jitun
Joined: 25 Mar 2009
Posts: 5
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| ICM7228 8-digit, 7-segment, numeric LED display Driver |
 Posted: Tue May 12, 2009 3:15 am |
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I had used this code in one of my previous project.The code is for interfacing ICM7228 from Intersil(Actually I used this) but if will work fine for the same from Maxim. Thought it will be helpful to someone.
ICM7228.c
| Code: |
#define clk_delay 1
int1 global_mode;
int1 global_ram;
//used to strobe the write pin of ICM7228
//Used as helper function
void pulse_write()
{
output_high(ICM_WRITE);
delay_cycles(clk_delay);
output_low(ICM_WRITE);
output_high(ICM_WRITE);
}
//Takes an array of 8 datas and put them on the digits
//the dp decides the position of the decimal point
//1 -> decimal point on 1st digit
//8 -> decimal point on 8th digit
//mode decides which mode of decoding to use CODE B OR HEX
//0 -> CODE B Decode
//1 -> Hex Decode
//ram decides which RAM bank to use.
//0 -> RAM bank B
//1 -> RAM bank A
void display_digits(unsigned int8 arr[],unsigned int8 dp,int1 mode,int1 ram)
{
unsigned int8 i;
int decimal;
global_mode=mode;
global_ram=ram;
if(dp>0 && dp<9)
decimal=dp-1;
else
decimal=-1;
output_low(ICM_WRITE);
output_high(ICM_MODE);
if(mode)
{
if(ram)
ICM_PORT(0xD8);
else
ICM_PORT(0xD0);
}
else
{
if(ram)
ICM_PORT(0x98);
else
ICM_PORT(0x90);
}
pulse_write();
output_low(ICM_MODE);
//for(i=0;i<8;i++)
// arr[i]=data[i];
for(i=0;i<8;i++)
{
if(decimal==i)
ICM_PORT(arr[i]+0x00);
else
ICM_PORT(arr[i]+0x80);
pulse_write();
}
output_high(ICM_MODE);
if(mode)
{
if(ram)
ICM_PORT(0x58);
else
ICM_PORT(0x50);
}
else
{
if(ram)
ICM_PORT(0x18);
else
ICM_PORT(0x10);
}
pulse_write();
}
//Takes an array of 8 datas and put them on the digits
//this is for the no decode mode operation
void display_digits_nd(unsigned int8 arr[])
{
unsigned int8 i;
output_low(ICM_WRITE);
output_high(ICM_MODE);
ICM_PORT(0xB0);
pulse_write();
output_low(ICM_MODE);
for(i=0;i<8;i++)
{
ICM_PORT(arr[i]^0x80);
pulse_write();
}
output_high(ICM_MODE);
ICM_PORT(0x30);
pulse_write();
}
//it displays a data at the address given
//1 -> 1st digit
//8 -> 8th digit
//and dis_data is the data that is to be displayed there
//the dp decides whether the decimal point is to be added or not
void update_single_digit(unsigned int8 addr, unsigned int8 dis_data,int1 dp)
{
output_low(ICM_WRITE);
output_high(ICM_MODE);
if(global_mode)
{
if(global_ram)
ICM_PORT(0x58+(addr-1));
else
ICM_PORT(0x50+(addr-1));
}
else
{
if(global_ram)
ICM_PORT(0x18+(addr-1));
else
ICM_PORT(0x10+(addr-1));
}
pulse_write();
output_low(ICM_MODE);
if(dp)
ICM_PORT(dis_data+0x00);
else
ICM_PORT(dis_data+0x80);
pulse_write();
}
//it displays a data at the address given in no decode mode
//1 -> 1st digit
//8 -> 8th digit
//and dis_data is the data that is to be displayed there
//the dp decides whether the decimal point is to be added or not
void update_single_digit_nd(unsigned int8 addr, unsigned int8 data)
{
output_low(ICM_WRITE);
output_high(ICM_MODE);
ICM_PORT(0x30+(addr-1));
pulse_write();
output_low(ICM_MODE);
ICM_PORT(data+0x80);
pulse_write();
}
//it toggles the ram bank from A to B and vice versa.
//it is usefull when u need to show two values continously
//without updating the display ram
void toggle_ram()
{
output_high(ICM_MODE);
if(global_mode)
{
if(global_ram)
ICM_PORT(0x50);
else
ICM_PORT(0x88);
}
else
{
if(global_ram)
ICM_PORT(0x10);
else
ICM_PORT(0x18);
}
pulse_write();
output_low(ICM_MODE);
global_ram=~global_ram;
}
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Usage exmaple
main.C
| Code: |
#include <18F4550.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HSPLL //High Speed Crystal/Resonator with PLL enabled
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES BORV20 //Brownout reset at 2.0V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES NOWRTC //configuration not registers write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES MCLR //Master Clear pin enabled
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES PLL5 //PLL PreScaler
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=9)
#define ICM_ID7 PIN_D7 //DATA COMING
#define ICM_ID6 PIN_D6 //HEXA/#CODEB
#define ICM_ID5 PIN_D5 //#DECODE
#define ICM_ID4 PIN_D4 //#SHUTDOWN
#define ICM_ID3 PIN_D3 //RAM BANK SELECT
#define ICM_ID2 PIN_D2
#define ICM_ID1 PIN_D1
#define ICM_ID0 PIN_D0
#define ICM_WRITE PIN_E1
#define ICM_MODE PIN_E0
#define ICM_PORT(value) output_d(value)
#include "ICM7228.c"
void main()
{
int data1[8]={0x38,0x77,0x6F,0x54,0x77,0x1E,0x30,0x78}; //It writes LAgnAJit
int data2[8]={1,2,3,4,12,11,13,14};
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
display_digits_nd(data1); //No decode mode
delay_ms(1500);
update_single_digit_nd(1,0); //Clears the 1st position as it is 0 in the no decode mode
delay_ms(1500);
display_digits(data2,4,0,0); //Decode as Code B, Decimal at 4th place
delay_ms(1500);
display_digits(data2,2,1,0); //Decode as Hex, Decimal at 2nd place
delay_ms(1500);
update_single_digit(1,6,0); //Update the 1st digit to '4'
}
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The source code and the Proteus design simulation can be found from the below links
http://rapidshare.com/files/232024658/ICM7228_Interfacing.zip
http://ifile.it/2wd9c6q |
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