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ajinkya.k
Joined: 09 Mar 2016
Posts: 2
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| RS232 INT_RDA problem with PIC18f4550 |
 Posted: Wed Mar 09, 2016 7:57 pm |
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My program
| Code: |
#include <18F4550.h>
#use delay(clock=8000000) // tell compiler what we intend to use
#fuses INTRC, HS,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN,NOPBADEN,PUT
#BYTE OSCCON = 0xFd3
#BYTE RCREG = 0xFAE
#use rs232(baud=9600,xmit=PIN_C6,bits=8,rcv=PIN_C7)
#define LCD_ENABLE_PIN PIN_D3 ////
#define LCD_RS_PIN PIN_D1 ////
#define LCD_RW_PIN PIN_D2
#include<lcd.c>
int8 densityCount=0;
#int_EXT
EXT_isr(void)
{
delay_ms(100);
densityCount++;
}
#int_EXT1
EXT1_isr(void)
{
delay_ms(100);
densityCount--;
}
#int_RDA
RDA_isr(void)
{
lcd_init();
lcd_putc("got");
delay_ms(100);
}
char getID()
{
char c=getc();
//while(c!='\n')
lcd_putc(c);
/*
if((char)c=='0')
{
printf("AT+CIPSEND=0,15\r\n");
delay_ms(500);
printf("<html>hi</html>\r\n");
delay_ms(500);
printf("AT+CIPCLOSE=0\r\n");
}
*/
}
initESP()
{
printf("AT+RST\r\n");delay_ms(2000);
printf("AT+CWMODE=3\r\n");delay_ms(2000);
printf("AT+CWSAP=\"st2\",\"123456789\",1,3\r\n");delay_ms(2000);
printf("AT+CIPMUX=1\r\n");delay_ms(2000);
printf("AT+CIPSERVER=1,8000\r\n");delay_ms(2000);
}
initInterrupts()
{
enable_interrupts(PERIPH ); //GIE=1
enable_interrupts(INT_EXT_L2H ); //INTE=1
enable_interrupts(INT_EXT1_L2H ); //INTE=1
}
void main()
{
char c;
OSCCON = 0x72;
lcd_init();
lcd_putc("Booting Wifi:st2");
lcd_gotoxy(1,2);
lcd_putc("Station 2");
initESP();
initInterrupts();
delay_ms(2000);
//INTE=1)
while(1)
{
enable_interrupts(INT_RDA);
//getID();
delay_ms(100);
lcd_init();
delay_ms(100);
lcd_putc("Traffic: st2");
// lcd_putc(getc());
lcd_gotoxy(1,2);
printf(lcd_putc,"%u",densityCount);
delay_ms(100);
}
}
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Function to be done by this program: Counting traffic density from INT_EXT and INT_EXT.
Problem in program i am facing:
I am not able to get request to the RS232 reception, after ESP module (ESP8266, connected and initialised at hardware serial port). Hence can't respond to client request when i put 192.168.4.1:8000 at browser'
Please help' |
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temtronic
Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario
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| Posted: Wed Mar 09, 2016 8:15 pm |
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Some things that are critically wrong...
1) errors must be added to the uses rs232(.....) options
2) delays must NOT be in int_EXT
3) delays must NOT be in int_EXT1
4) delays must NOT be in int_RDA
5) prints must NOT be in int_RDA
6) lcd_init() only needs to be issued once in the program
7) have no idea why osccon=72h
8) potential hardware conflict assuming 5V PIC, 3V ESP module
9) #use delay issued before fuses
others may see more, but this is a start.
Jay |
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ajinkya.k
Joined: 09 Mar 2016
Posts: 2
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| After changes |
| Posted: Wed Mar 09, 2016 8:27 pm |
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072 is used to boost internal oscillator.
Using delay is just to let go any blurry signal from IR sensor module.
Current situation:
Every time i reset the system and ESP get initialised, it show got on lcd.
I think it's reading the earlier command in register every time, hence giving INT_RDA call.
One more thing to add,..
PIC can call the int_rda but, it's not calling it when needed, to illustrate more:
When system get restart, it directly go to int rda.. not event looping in main. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19552
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| Posted: Thu Mar 10, 2016 2:05 am |
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The delays will stop the INT_RDA from working.
Because you have these, the interrupts will be delayed in the 'main' code.
Data arrives during this time, interrupt does not occur. Another byte arrives, and the UART then gets locked up. Result no RS232.
Similarly, a second byte arrives while it is in the ISR, and again the UART will be locked.
Second problem, is that an interrupt _must_ always handle the physical event that the interrupt signifies. INT_RDA, says 'a byte is waiting to be read', so INT_RDA, _must_ read this byte. Because you don't, the interrupt can never exit. It tries to exit, and then is immediately called again, since there is still a byte waiting....
So:
1) Use a timer to do your IR pulse. Simply setup a timer giving a reasonable count rate, in the 'main', and then when you want the delay in the interrupt, set the timer to the value to timeout in 100mSec, clear it's interrupt, enable it's interrupt, and exit the current interrupt. When the timer interrupts, you know that 100mSec has passed.
2) Add 'ERRORS' to the #use RS232. This _must_ always be present when using the hardware UART, unless _you_ add error handling to your code. This will prevent the UART becoming hung.
3) Get rid of the delays in all interrupts - this includes removing the LCD routines from inside the interrupt.
4) you must read the UART in INT_RDA. So getc. |
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