Serial LED 7 Segment 5inches

User Manual: Serial LED 7 segment 5inches

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[STX] – Start of transmission marker,
ASCII value = 0x02
[ETX] – End of transmission marker, ASCII
value = 0x03

Transmission Format: [STX]+5+T+[ETX]

‘correct way to send [STX] & ETX marker
Serial1.print(chr(2)+”5T”+chr(3))

Serial1.print(“[STX]5R[ETX]”) ‘WRONG!

// correct way to send [STX]
Serial.write(0x02);
// Address=5, T = test command
Serial.print(“5T”);
// [ETX] marker
Serial.write(0x03);

Serial.print(“[STX]5T[ETX]”);

// WRONG!

Serial.print(“\0025T\003”);
// where “\002” = STX, “\003” = ETX

//CRC-8 - based on the CRC8 formulas by
// Dallas/Maxim
//code released under the terms of the
// GNU GPL 3.0 license
uint8_t crc8_update(uint8_t crc, uint8_t
data) {
uint8_t updated = crc ^ data;
for (uint8_t i = 0; i < 8; ++i) {
if ((updated & 0x80 ) != 0) {
updated <<= 1;
updated ^= 0x07;
}
else {
updated <<= 1;
}
}
return updated;
}

uint8_t cal_crc8(char *txstring){
uint8_t crc=0;
char *txptr=txstring;
while(*txptr !=0){
crc=crc8_update(crc,(uint8_t)*txptr);
txptr++;
}
return(crc | 0x80); // see text
}

// comment out if you do not wish to enable crc checking
#define

CRC_ENABLE

/*
* Send a packet to Serial Display unit
* The packet is wrapped with STX and ETX markers as required by the
* Serial Display Unit
* txstring - message string to send
*/
#define
#define

STX 0x02
ETX 0x03

void send_to_display(char addr, char *txstring){
uint8_t crc=0;
char *txptr=txstring;
#ifdef CRC_ENABLE
//compute for crc8
crc=crc8_update(crc,addr+0x30); // include device id in the calculation
while(*txptr !=0){
//Serial.print(*txptr,HEX);
crc=crc8_update(crc,(uint8_t)*txptr);
txptr++;
}
crc |= 0x80;
#endif
Serial.write(STX);
Serial.write(addr+0x30);
Serial.print(txstring);
#ifdef CRC_ENABLE
Serial.write(crc);
#endif
Serial.write(ETX);
}

#define

LEDADDR
5
// setting

// led controller device ID. Change according to your own

/*
* Initialize and test Serial Display unit
*/
void init_display(void){
// setup serial LED for 16 panels
send_to_display(LEDADDR,"P0");
// 0=16 panels
delay(500);
send_to_display(LEDADDR,"T");
// segment test, turns ON all segment for a second
delay(1000);
#ifdef CRC_ENABLE

// enable crc checking
send_to_display(LEDADDR,"_CRC");
#endif
}

send_to_display(LEDADDR,”C”);

send_to_display(LEDADDR,”D53587”);

send_to_display(LEDADDR,”D163.14156”);
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Producer                        : GPL Ghostscript 9.06
Modify Date                     : 2017:08:04 11:15:29+08:00
Create Date                     : 2017:08:04 11:15:29+08:00
Creator Tool                    : Adobe Acrobat 17.9.0
Document ID                     : uuid:aabd61b5-7b1e-11e7-0000-a0cd956e24ad
Format                          : application/pdf
Title                           : Serial LED 7 segment 5inches.pdf
Creator                         : bok pogi
Author                          : bok pogi
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