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transmit DMX

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djprosound

Joined: 03 Aug 2010
Posts: 4

transmit DMX

Posted: Wed Aug 04, 2010 3:21 pm

Hi , I have a problem with DMX sending. I want to transmit a DMX signal from a pic 18f2550. I use a 20MHz Crystal and the hardware EUSART.
I compiled this code but it doesn't work, the dmx equipment doesn't recognize it.

This is the code:

Code:

#include <18F2550.h>
#include <stdio.h>
#include <stdlib.h>

#fuses HS, WDT, NOPROTECT, PUT, BROWNOUT, LVP
#ZERO_RAM
#use delay(clock=20000000)
#use rs232( baud=250000, xmit=PIN_C6)

#define MAX_LEVELS 512

#BYTE portc =0x0F82
#BYTE portb =0x0F81
#BYTE porta =0x0F80
#byte SPBRG = 0xFAF
#byte RCSTA = 0xFAB
#byte TXSTA = 0xFAC
#byte RCREG = 0xFAE
#byte PIR1 = 0xF9E
#byte PIE1 = 0xF9D
#byte INTCON = 0xFF2
#byte TXREG = 0xFAD
#byte BAUDCON =0xFB8

#bit SPEN = RCSTA.7 /* Serail port activado */
#bit RX9 = RCSTA.6 /* 9-bit activado */
#bit SREN = RCSTA.5 /* En modo asyncrono no se tiene en cuenta */
#bit CREN = RCSTA.4 /* Recepcion continua activada */
#bit ADDEN = RCSTA.3
#bit FERR = RCSTA.2 /* Frame error bit */
#bit OERR = RCSTA.1 /* Overrun error bit */
#bit RX9D = RCSTA.0 /* El noveno bit */

#bit TXIE = PIE1.4
#bit RCIF = PIR1.5
#bit RCIE = PIE1.5

#bit GIE = INTCON.7
#bit PEIE = INTCON.6

#bit TXEN = TXSTA.5
#bit TX9 = TXSTA.6
#bit TX9D = TXSTA.0
#bit BRGH = TXSTA.2
#bit SYNC = TXSTA.4
#bit TRMT = TXSTA.1

BOOLEAN Send_Break = TRUE;
BOOLEAN Send_Start_Code = FALSE;
int8 c=0; /*just for test- all ch at 0 */

#INT_TBE
void Tx_Data(void)
{
static unsigned int32 tx_index = 0;

TXREG = c;
tx_index++;
if (tx_index >= MAX_LEVELS)
{
/* Disable the interrupt if we are done transmitting */
disable_interrupts(INT_TBE);
tx_index = 0;
Send_Break = TRUE;
}
}

setup_oscillator(OSC_20MHZ);
void main(void)
{

set_tris_c(0b10111111);

/*Se setea la USART*/
SPBRG=4; /* SPBRG=0 implica que a 4Mhz el baudrate=250.000*/
BRGH=1; /* BRGH=1 implica High speed*/
SYNC=0;
SPEN=1;
TXEN=0;
TXIE=0;
CREN=1;
RCIE=0;
TX9D=1;
TX9=1;

/*Se setean las interrupciones*/
GIE=1; /*Activa todas las interrucpiones globales*/
PEIE=1; /*Activa las interrupciones de perifericos*/
RCIE=1; /*Activa las interrupciones de recepcion*/

disable_interrupts(INT_TBE);
while(1)
{
if (Send_Break )
{
disable_interrupts(INT_TBE);
TXEN=0;
bit_clear(portc, 0x06);

delay_us(88);
Send_Break = FALSE;
Send_Start_Code=TRUE;
}
else if(Send_Start_Code)
{
Send_Start_Code=FALSE;
bit_set(portc, 0x06);
delay_us(8);
enable_interrupts(INT_TBE);
TXEN=1;
set_tris_c(0b10111111);
}

}

}

Thanks!

Emi

djprosound

Joined: 03 Aug 2010
Posts: 4

Posted: Wed Aug 04, 2010 9:14 pm

Hi, I've been working on a DMX transmitter with a pic18f2550. Finally I could send the data correctly, I tested it with an OS and it looks very good. It's based on a Mark help-code, and I finished it. This is my tiny contribution.

Sorry for my bad english.

Code:

#include <18F2550.h>
#include <stdio.h>
#include <stdlib.h>

#fuses HS, WDT, NOPROTECT, PUT, BROWNOUT, LVP

#use delay(clock=20000000)
#use rs232( baud=250000, xmit=PIN_C6, rcv=PIN_C7)
setup_oscillator(OSC_20MHZ);
/*****************************************************************************/
/* ASIGNACION DE REGISTROS */
/*****************************************************************************/

/*Registro de Control y Estado del modulo de Transmision*/
#byte TXSTA = 0xFAC
#bit TX9D = TXSTA.0 /*Noveno bit de transmision*/
#bit TRMT = TXSTA.1 /*Estado del TSR. Solo lectura. 1> VACIO 0>LLENO*/
#bit BRGH = TXSTA.2 /*En modo ASYNC 1>HS Baud 0>LS Baud*/
#bit SENDB = TXSTA.3 /*Envio de Break de 12bits - NO APTO DMX*/
#bit SYNC = TXSTA.4 /*Modo de sincronismo 1>SYNC 0>ASYNC*/
#bit TXEN = TXSTA.5 /*Transmision 1>ENABLE 0>DISABLE*/
#bit TX9 = TXSTA.6 /*Modo de transmision en 9-bits 1>9BITS 0>8BITS */
#bit CSRC = TXSTA.7 /*Fuente de reloj. No importa en ASYNC*/
/*Registro de Control y Estado del modulo de Recepcion*/
#byte RCSTA = 0xFAB
#bit RX9D = RCSTA.0 /*Noveno bit de recepcion*/
#bit OERR = RCSTA.1 /*Error de OVERRUM 1>ERROR 0>OK*/
#bit FERR = RCSTA.2 /*Error de TRAMA 1>ERROR 0>OK*/
#bit ADDNEN = RCSTA.3 /*Deteccion de direccion por 9-bit 1>ON 0>OFF*/
#bit CREN = RCSTA.4 /*Recepcion Continua 1>ENABLE 0>DISABLE*/
#bit SREN = RCSTA.5 /*Recepcion por bit 1>ENABLE 0>DISABLE*/
#bit RX9 = RCSTA.6 /*Recepcion de 9bits 1>9BITS 0>8BITS*/
#bit SPEN = RCSTA.7 /*Activacion Puerto Serie 1>ON 0>OFF*/
/*Registro de control del Baud Rate*/
#byte BAUDCON = 0xFB8
#bit ABDEN = BAUDCON.0/*Auto Baud Rate 1>ON 0>OFF*/
#bit WUE = BAUDCON.1/*WakeUP 1>ON 0>OFF*/
#bit BRG16 = BAUDCON.3/*BR16 Bits 1>1BITS 0>8BITS*/
#bit SCKP = BAUDCON.4/*Polaridad de Reloj No usada en ASYNC*/
#bit RCIDL = BAUDCON.6/*Recepcion IDLE 1>IDLE 0>ACTIVE*/
#bit ABDOVF = BAUDCON.7/*Auto Baud Rate Status*/
/*Registro de interrupciones INTCON*/
#byte INTCON = 0xFF2
#bit RBIF = INTCON.0/**/
#bit INT0IF = INTCON.1/**/
#bit TMR0IF = INTCON.2/**/
#bit RBIE = INTCON.3/**/
#bit INT0IE = INTCON.4/**/
#bit TMR0IE = INTCON.5/**/
#bit PEIE = INTCON.6/*Int de perifericos 1>ENABLE 0>DISABLE*/
#bit GIE = INTCON.7/*Int Globales 1>ENABLE 0>DISABLE*/
/*Registros (PIR1 - PIE1) de interrupcion de perifericos*/
#byte PIR1 = 0xF9E
#bit TMR1IF = PIR1.0 /**/
#bit TMR2IF = PIR1.1 /**/
#bit CCP1IF = PIR1.2 /**/
#bit SSPIF = PIR1.3 /*FLAG SSP 1>Tx/Rx completada 0>Esperando Tx/Rx (*) */
#bit TXIF = PIR1.4 /*FLAG SSP 1>TXREG Vacio 0>TXREG Lleno (*) */
#bit RCIF = PIR1.5 /*FLAG SSP 1>RCREG Vacio 0>RCREG Lleno (*) */
#bit ADIF = PIR1.6 /**/
#bit SPPIF = PIR1.7 /**/
#byte PIE1 = 0xF9D
#bit SSPIE = PIE1.3 /*MSSP 1>ENABLE 0>DISABLE*/
#bit TXIE = PIE1.4 /*Activacion de inter Tx 1>ENABLE 0>DISABLE*/
#bit RCIE = PIE1.5 /*Activacion de inter Rx 1>ENABLE 0>DISABLE*/
#byte RCON = 0xFD0
#bit IPEN = RCON.7 /*Prioridad 1>ON 0>OFF*/
/* (*) Debe ser reseteado por SOFTWARE */
/*Funciones de Registro*/
#byte SPBRG = 0xFAF /*Generador del Baud Rate*/
#byte RXREG = 0xFAE /*Registro de Recepcion*/
#byte TXREG = 0xFAD /*Registro de Transmision*/
/*Registros asociados a los puertos*/
#byte portc=0x0F82

/*****************************************************************************/
/* VARIABLES GLOBALES */
/*****************************************************************************/
BOOLEAN Send_Break = TRUE;
BOOLEAN Send_Start = FALSE;
/*Este es un ejemplo de un arrgelo con valroes DMX, pero tranquilamente podria ser
la lectura de un puerto ADC o lo que fuere*/
static unsigned int8 tx_DMX[512]={254,100,0,254,90,254,200,254,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0};

/*****************************************************************************/
/* INTERRUPCIONES */
/*****************************************************************************/
#INT_TBE
void tx_DMX512(void)
{
static unsigned int16 i=0; /*Contador de elementos enviados*/

TXREG=tx_DMX[i]; /*Envio de la informacion*/
i++;
/*Verifico si se enviaron los 512 camales. De ser asi desactivo la INT
y activo el envio del Break*/
if(i>=512)
{
i=0;
TXIE=0; /*Apago la interrupcion de transmision*/
Send_Break = TRUE;
}
}

/*****************************************************************************/
/* FUNCION PRINCIPAL */
/*****************************************************************************/
void main(void)
{
/*SETEO DE LA EUSART*/
/*Funciones de Registro Princiales*/
SPBRG = 19; /*Generador del Baud Rate*/
BRGH = 1; /*En modo ASYNC 1>HS Baud 0>LS Baud*/
SYNC = 0; /*Modo de sincronismo 1>SYNC 0>ASYNC*/
BRG16 = 1; /*BR16 Bits 1>16BITS 0>8BITS*/
SPEN = 0; /*Activacion Puerto Serie 1>ON 0>OFF*/
TXIE = 0; /*Activacion de inter Tx 1>ENABLE 0>DISABLE*/
TXEN = 0; /*Transmision 1>ENABLE 0>DISABLE*/
TX9 = 1; /*Modo de transmision en 9-bits 1>9BITS 0>8BITS */
/*Control y Estado del modulo de Transmision*/
TX9D = 1; /*Noveno bit de transmision*/
SENDB = 0; /*Envio de Break de 12bits - NO APTO DMX*/
/*Control y Estado del modulo de Recepcion*/
RX9D = 1; /*Noveno bit de recepcion*/
ADDNEN = 0; /*Deteccion de direccion por 9-bit 1>ON 0>OFF*/
CREN = 1; /*Recepcion Continua 1>ENABLE 0>DISABLE*/
SREN = 0; /*Recepcion por bit 1>ENABLE 0>DISABLE*/
RX9 = 1; /*Recepcion de 9bits 1>9BITS 0>8BITS*/
/*Registro de control del Baud Rate*/
ABDEN = 0; /*Auto Baud Rate 1>ON 0>OFF*/
WUE = 0; /*WakeUP 1>ON 0>OFF*/
SCKP = 0; /*Polaridad de Reloj No usada en ASYNC*/
RCIDL = 0; /*Recepcion IDLE 1>IDLE 0>ACTIVE*/
/*Registro de interrupciones INTCON*/
PEIE = 0; /*Int de perifericos 1>ENABLE 0>DISABLE*/
GIE = 0; /*Int Globales 1>ENABLE 0>DISABLE*/
/*Registros (PIR1 - PIE1) de interrupcion de perifericos*/
SSPIE = 0; /*MSSP 1>ENABLE 0>DISABLE*/
RCIE = 0; /*Activacion de inter Rx 1>ENABLE 0>DISABLE*/
IPEN = 0; /*Prioridad 1>ON 0>OFF*/

delay_ms(500); /*Retardo de arranque*/
while(1)
{
if(Send_Break )
{
SPEN=0; /*Desactivo el Puerto Serie*/
PEIE=0; /*Apago las interrupciones de perifericos*/
GIE=0; /*Apago las interrupciones globlaes*/
TXIE=0; /*Apago la interrupcion de transmision*/
TXEN=0;
/*Se genera el BREAK de 88us seguido del MAB*/
bit_clear(portc,0x06);
delay_us(88);
output_high(PIN_C6);
delay_us(100);

Send_Break = FALSE;
Send_Start = TRUE;
}
else if(Send_Start)
{
Send_Start = FALSE;
/*Enciendo nuevamente el puerto y activo las interrupciones*/
SPEN=1;
TXIE=1; /*Enciendo la interrupcion de transmision*/
TX9=1; /*Transmision de 9 bits*/
TXEN=1; /*Habilito la transmision*/
TX9D=1; /*Seteo del noveno bit en 1. Lo uso como un uno de los dos bit de stop*/
/*Se transmite el Byte de inicio*/
TXREG=0; /*Cargo en el registro el valor 0. Es el Start Code*/
PEIE=1; /*Enciendo las interrupciones de perifericos*/
GIE=1; /*Enciendo las interrupciones globlaes*/
}
}
}

Emi

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