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uart n lcd

 
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uart n lcd
PostPosted: Tue Apr 07, 2009 9:38 pm     Reply with quote
Hai!! all

I want to control red LED at UART hardware. I have to send command to switch on the red LED and display to LCD the return byte.

this is the send command:
Quote:
0xBA,0x03,0x40,0x01,0xB8

and the return byte:
Quote:
0xBD,0x03,0x40,0x00,Checksum

return byte number 4 got two option 0x00 or 0xF0

This is my programming:

Code:
#define (__PCM__)
#include<16f877A.h>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,parity=n,bits=8)
#include <flex_lcd.c>

unsigned char ControlRedLed[5]       = {0xBA,0x03,0x40,0x01,0xB8};
int8 ctr;
unsigned char rbuff[5];

void main() {
lcd_init();  // Always call this first.

lcd_putc("\fHello World\n");


for (ctr=0;ctr<5;ctr++) putc(ControlRedLed[ctr]); //send command switch on Red LED
for (ctr=0;ctr<5;ctr++) rbuff[ctr]=getc(); //receive 5 response bytes

   if (rbuff[3]==0) {

   lcd_putc("\fon succed\n");// to show LEd able to switch on
   }


   else {

   lcd_putc("\fon fail\n"); // to show fail
   }

for (ctr=0;ctr<5;ctr++){
   lcd_putc(rbuff[ctr]);
   break;
   }

while(1);

}



My result:

The LCD just display Hello world

Red LED at UART hardware also not switch on Crying or Very sad

Plz hep.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 07, 2009 11:27 pm     Reply with quote
Make a simple program that just sends back the bytes that it receives.
This will prove if your basic communication with the host is working.
Code:
#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//============================
void main()
{
char c;

while(1)
  {
   c = getc();
   putc(c);
  }

} 
 
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