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Mahdi
Joined: 21 Aug 2012
Posts: 47
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| gets() problem |
 Posted: Sun Dec 29, 2013 5:24 am |
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hi buddies
i want to send string and receive with uart protocol in isis simulator
transmitter code :
| Code: | #include <33FJ32MC204.h>
#use delay(crystal=80M)
#pin_select U1TX=PIN_C6
#pin_select U1RX=PIN_C7
#use rs232(UART1, baud=230400,errors)
#include <stdio.h>
#include <string.h>
#INCLUDE <stdlib.h>
#include <LCD.C>
void main()
{
lcd_init();
signed int8 x=10,y=-20,z=35,a=0;
unsigned int8 trt,batt;
char trt1[40],x1[10],y1[10],z1 [10],crt[2];
strcpy(trt1,"");
strcpy(x1,"");
strcpy(y1,"");
strcpy(crt,",");
while(TRUE)
{
itoa(trt,10, trt1);
itoa(x,10, x1);
itoa(y,10, y1);
itoa(z,10, z1);
strcat(trt1,crt);
strcat(trt1,x1);
strcat(trt1,crt);
strcat(trt1,y1);
strcat(trt1,crt);
strcat(trt1,z1);
lcd_gotoxy(1,1);
printf(lcd_putc,"%s",trt1);
puts(trt1);
delay_ms(10);
}
} |
receiver code :
| Code: |
#include <33fj32mc204.h>
#use delay(crystal=80m)
#use i2c(MASTER,I2C1,FAST)
#pin_select U1RX=PIN_C7
#pin_select U1TX=PIN_C6
#use rs232(UART1,baud=230400,errors)
#define gyro_xsens 6
#define gyro_ysens 6
#define gyro_zsens 6
#include <var.c>
#INCLUDE <lcd.c>
char x1 [40],bb;
#INT_RDA
void rda_isr(void)
{
output_high(pin_a1);
gets(x1);
bb=getc();
output_low(pin_a1);
}
#INT_TIMER3
void timer3_isr(void)
{
output_high(pin_a0);
i2c_start();
i2c_write(0xd0);
i2c_write(0x43);
i2c_start();
i2c_write(0xd1);
gxh=i2c_read(1);
gxl=i2c_read(0);
i2c_stop();
i2c_start();
i2c_write(0xd0);
i2c_write(0x45);
i2c_start();
i2c_write(0xd1);
gyh=i2c_read(1);
gyl=i2c_read(0);
i2c_stop();
i2c_start();
i2c_write(0xd0);
i2c_write(0x47);
i2c_start();
i2c_write(0xd1);
gzh=i2c_read(1);
gzl=i2c_read(0);
i2c_stop();
gx = make16(gxh,gxl) - gx_OFFSET;
gy = make16(gyh,gyl) - gy_OFFSET;
gz = make16(gzh,gzl) - gz_OFFSET;
gxrate = gx/gyro_xsens;
gyrate = gy/gyro_ysens;
gzrate = gz/gyro_zsens;
output_low(pin_a0);
}
void main(){
lcd_init();
setup_timer3(TMR_INTERNAL | TMR_DIV_BY_64, 1562);
enable_interrupts(INT_timer3);
enable_interrupts(INT_RDA);
enable_interrupts(INTR_GLOBAL);
while(TRUE){
}
}
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i use pin a1 for rda interrupt to measure period of interrupt(blue line)
and pina0 for timer3 interrupt to measure............. (yellow line)
in rda interrupt i have 500 us delay until data received
in timer3 interrupt i have 90 us delay until interrupt finished and timer3 set to 2.5 ms and fire.
all things is work but After a period of time, rda interrupt lock for 10 ms why?
ccs v 5
thanks |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Sun Dec 29, 2013 6:13 am |
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Thats one strange baud rate.
Read the sticky post related to Proteus.
Why not just make a small sample program to comunicate between the pics first and then include all the other stuff you are doing? That way you know your comms are working.
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19332
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| Posted: Sun Dec 29, 2013 8:19 am |
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A number of comments ignoring Proteus....
1) What is the maximum crystal frequency the chip supports?......
This will stop the code working in a real chip.
2) INT_RDA, implies _one_ character is available to be read. Do a search here for why you should not use 'gets' in this interrupt, and for replacements.
INT_RDA used like this will lock the receive chip, till a line feed is seen. |
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Mahdi
Joined: 21 Aug 2012
Posts: 47
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| Posted: Sun Dec 29, 2013 12:30 pm |
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| Ttelmah wrote: | A number of comments ignoring Proteus....
1) What is the maximum crystal frequency the chip supports?......
This will stop the code working in a real chip.
2) INT_RDA, implies _one_ character is available to be read. Do a search here for why you should not use 'gets' in this interrupt, and for replacements.
INT_RDA used like this will lock the receive chip, till a line feed is seen. |
thanks
when i disable timer3 interrupt the rda interrupt work without any problem.
In my opinion the getc() clear buffer and flag of interrupt but gets() cant it.
now i should clear flag of uart receiver but how ? |
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andrewg
Joined: 17 Aug 2005
Posts: 316
Location: Perth, Western Australia
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| Posted: Mon Dec 30, 2013 12:59 am |
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| Mahdi wrote: | when i disable timer3 interrupt the rda interrupt work without any problem.
In my opinion the getc() clear buffer and flag of interrupt but gets() cant it. |
gets will clear the buffer and interrupt flag, but it's the wrong function for a serial interrupt handler. You might think it's working, but it isn't. INT_RDA is called for each character and you need to call getc() exactly once for each interrupt. Usually your interrupt handler will put each character into a buffer which your mainline loop will read. See the CCS example "EX_SISR.C". If you need gets() functionality, you will need to write it yourself.
_________________
Andrew |
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