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uart n lcd |
Posted: Tue Apr 07, 2009 9:38 pm |
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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
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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
Plz hep. |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Tue Apr 07, 2009 11:27 pm |
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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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