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prafulla.prolific
Joined: 05 Jun 2013
Posts: 10
Location: Mumbai
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| Help for PIC to PIC Communication using RS485 |
 Posted: Mon Jun 24, 2013 2:04 am |
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I am having problem in RS485 communication I have written my code with the help of example but i have problem. My hardware is ok having PIC 16F873A, 6 Keys & Max 485 IC .
my code as
| Code: |
#include<rs485.c>
#define RS485_ID OUR_RS485_ID
//------------------------------------------------------------------------------
#define MINIMUM_FIRING_ENGLE 150
#define MAXIMUM_FIRING_ENGLE 240
#define CH1_ON 0x01
#define CH1_OFF 0x02
#define CH2_ON 0x03
#define CH2_OFF 0x04
#define CH3_ON 0x05
#define CH3_OFF 0x06
//------------------------------------------------------------------------------
unsigned int1 ch_on;
int8 OUR_RS485_ID = 0;
void initialise_ports(void);
int8 chk_status(void);
unsigned int8 key_data;
unsigned int8 dimming_value;
//------------------------------------------------------------------------------
#int_TBE
void TBE_isr(void)
{
putc(dimming_value);
}
#int_TIMER1
void TIMER1_isr(void)
{
// int8 i;
// if(rs485_get_message(msg, FALSE))
// {
// printf("\n\r%d: ", msg[0]);
// for(i=0; i < msg[1]; ++i)
{
// putc(msg[i+2]);
}
// printf("\n\r");
// }
}
/*
#int_TIMER0
void TIMER0_isr(void)
{
}
*/
//------------------------------------------------------------------------------
void main()
{
unsigned int8 dimming_ch1;
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
SET_TRIS_A(0x3F);
initialise_ports();
// enable_interrupts(INT_TIMER1);
// enable_interrupts(INT_TIMER0);
// enable_interrupts(INT_TBE);
// enable_interrupts(GLOBAL);
key_data=0xff;
while(TRUE)
{
key_data=chk_status();
if(key_data != 0xFF)
{
delay_ms(10);
if(key_data == 0xfe)
{
output_high(PIN_C0);
ch_on=1;
dimming_value=CH1_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A0));
}
if(key_data == 0xfd)
{
output_low(PIN_C0);
ch_on=0;
dimming_value=CH1_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A1));
}
if(key_data == 0xef)
{
output_high(PIN_C1);
dimming_value=CH2_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A4));
}
if(key_data == 0xdf)
{
output_low(PIN_C1);
dimming_value=CH2_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A5));
}
if(key_data == 0xbf)
{
output_high(PIN_C2);
dimming_value=CH3_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_B4));
}
if(key_data == 0x7f)
{
output_low(PIN_C2);
dimming_value=CH3_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_B5));
}
if(ch_ON)
{
output_high(PIN_C0);
if(key_data == 0xfb)
{
while(!input(PIN_A2));
{
if(dimming_ch1 < 238)
{
dimming_ch1++;
}
else
{
dimming_ch1 = 240;
}
dimming_value=dimming_ch1;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
delay_ms(40);
output_toggle(PIN_C3);
}
}
if(key_data == 0xf7)
{
while(! input(PIN_A3));
{
if(dimming_ch1 > 152)
{
dimming_ch1--;
}
else
{
dimming_ch1 = 150;
}
dimming_value=dimming_ch1;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
delay_ms(40);
output_toggle(PIN_C3);
}
}
}
}
key_data=0xff;
}//end_of_while
}
//------------------------------------------------------------------------------
void initialise_ports(void)
{
output_high(PIN_A0);
output_high(PIN_A1);
output_high(PIN_A2);
output_high(PIN_A3);
output_high(PIN_A4);
output_high(PIN_A5);
output_low(PIN_C0);
output_low(PIN_C1);
output_low(PIN_C2);
output_float(PIN_C3);
output_high(PIN_B4);
output_high(PIN_B5);
}
//------------------------------------------------------------------------------
int8 chk_status(void)
{
int8 temp;
temp=((input_B()<<2) & 0xC0);
temp=((input_A() & 0x3F) | temp);
return temp;
}
//------------------------------------------------------------------------------
void init_variable(void)
{
// MAXIMUM_FIRING_ENGLE;
}
//------------------------------------------------------------------------------
void RS485send(char* s, int8 id)
{
int8 size;
for(size=0; s[size]!='\0'; ++size);
rs485_wait_for_bus(FALSE);
while(!rs485_send_message(id, size, s))
delay_ms(OUR_RS485_ID);
}
//------------------------------------------------------------------------------
|
can any help me please just guide me i will follow guideline.
_________________
I m Working as PIC Programmer Fresher |
|
 |
prafulla.prolific
Joined: 05 Jun 2013
Posts: 10
Location: Mumbai
|
| Re: Help for PIC to PIC Communication using RS485 |
| Posted: Mon Jun 24, 2013 3:52 am |
|
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| prafulla.prolific wrote: | I am having problem in RS485 communication I have written my code with the help of example but i have problem. My hardware is ok having PIC 16F873A, 6 Keys & Max 485 IC .
my code as
| Code: |
#include<rs485.c>
#define RS485_ID OUR_RS485_ID
//------------------------------------------------------------------------------
#define MINIMUM_FIRING_ENGLE 150
#define MAXIMUM_FIRING_ENGLE 240
#define CH1_ON 0x01
#define CH1_OFF 0x02
#define CH2_ON 0x03
#define CH2_OFF 0x04
#define CH3_ON 0x05
#define CH3_OFF 0x06
//------------------------------------------------------------------------------
unsigned int1 ch_on;
int8 OUR_RS485_ID = 0;
void initialise_ports(void);
int8 chk_status(void);
unsigned int8 key_data;
unsigned int8 dimming_value;
//------------------------------------------------------------------------------
#int_TBE
void TBE_isr(void)
{
putc(dimming_value);
}
#int_TIMER1
void TIMER1_isr(void)
{
// int8 i;
// if(rs485_get_message(msg, FALSE))
// {
// printf("\n\r%d: ", msg[0]);
// for(i=0; i < msg[1]; ++i)
{
// putc(msg[i+2]);
}
// printf("\n\r");
// }
}
/*
#int_TIMER0
void TIMER0_isr(void)
{
}
*/
//------------------------------------------------------------------------------
void main()
{
unsigned int8 dimming_ch1;
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
SET_TRIS_A(0x3F);
initialise_ports();
// enable_interrupts(INT_TIMER1);
// enable_interrupts(INT_TIMER0);
// enable_interrupts(INT_TBE);
// enable_interrupts(GLOBAL);
key_data=0xff;
while(TRUE)
{
key_data=chk_status();
if(key_data != 0xFF)
{
delay_ms(10);
if(key_data == 0xfe)
{
output_high(PIN_C0);
ch_on=1;
dimming_value=CH1_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A0));
}
if(key_data == 0xfd)
{
output_low(PIN_C0);
ch_on=0;
dimming_value=CH1_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A1));
}
if(key_data == 0xef)
{
output_high(PIN_C1);
dimming_value=CH2_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A4));
}
if(key_data == 0xdf)
{
output_low(PIN_C1);
dimming_value=CH2_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_A5));
}
if(key_data == 0xbf)
{
output_high(PIN_C2);
dimming_value=CH3_ON;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_B4));
}
if(key_data == 0x7f)
{
output_low(PIN_C2);
dimming_value=CH3_OFF;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
while(! input(PIN_B5));
}
if(ch_ON)
{
output_high(PIN_C0);
if(key_data == 0xfb)
{
while(!input(PIN_A2));
{
if(dimming_ch1 < 238)
{
dimming_ch1++;
}
else
{
dimming_ch1 = 240;
}
dimming_value=dimming_ch1;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
delay_ms(40);
output_toggle(PIN_C3);
}
}
if(key_data == 0xf7)
{
while(! input(PIN_A3));
{
if(dimming_ch1 > 152)
{
dimming_ch1--;
}
else
{
dimming_ch1 = 150;
}
dimming_value=dimming_ch1;
enable_interrupts(INT_TBE);
enable_interrupts(GLOBAL);
// disable_interrupts(INT_TBE);
delay_ms(40);
output_toggle(PIN_C3);
}
}
}
}
key_data=0xff;
}//end_of_while
}
//------------------------------------------------------------------------------
void initialise_ports(void)
{
output_high(PIN_A0);
output_high(PIN_A1);
output_high(PIN_A2);
output_high(PIN_A3);
output_high(PIN_A4);
output_high(PIN_A5);
output_low(PIN_C0);
output_low(PIN_C1);
output_low(PIN_C2);
output_float(PIN_C3);
output_high(PIN_B4);
output_high(PIN_B5);
}
//------------------------------------------------------------------------------
int8 chk_status(void)
{
int8 temp;
temp=((input_B()<<2) & 0xC0);
temp=((input_A() & 0x3F) | temp);
return temp;
}
//------------------------------------------------------------------------------
void init_variable(void)
{
// MAXIMUM_FIRING_ENGLE;
}
//------------------------------------------------------------------------------
void RS485send(char* s, int8 id)
{
int8 size;
for(size=0; s[size]!='\0'; ++size);
rs485_wait_for_bus(FALSE);
while(!rs485_send_message(id, size, s))
delay_ms(OUR_RS485_ID);
}
//------------------------------------------------------------------------------
|
can any help me please just guide me i will follow guideline. |
schematic for circuit as follow.
[img]http://postimg.org/image/3lh0mj333/[/img]
[img] [/img]
_________________
I m Working as PIC Programmer Fresher |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9162
Location: Greensville,Ontario
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| Posted: Mon Jun 24, 2013 5:42 am |
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'it doesn't work'...is not very helpful..
Please breakdown your program into smaller steps!
Get rid of 90% of your code!
You do not need interrupts for this program.
You do not need to set tris either(compiler's very smart,does it for you!
First thing I'd do is to create a 'read keyboard' function. Start with reading the ports and sending data to a PC terminal program to confirm the keys are correct. Then add your 'chk_status' function, test, confirm that your logic is correct, again sending data to a PC terminal program.
You do NOT want to initialise porta pins high. You chose them to be INPUTS and have pullups/switches on them not OUTPUTs.
Same hold true for B4 and B5.
Same problem with C3.
In fact get rid of the entire 'initialise' function.
ther's more 'wrong' but I need to get a coffee....
hth
jay |
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