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teongkia
Joined: 12 Apr 2007
Posts: 7
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| SET_TRIS_ for 16F877 |
 Posted: Thu Apr 12, 2007 9:59 am |
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Hi I'm using PIC16F877 for my project. Can anyone let me know how to SET_TRIS_A(_X__)
SET_TRIS_B etc.
I have pin A0,A1,A2,A3,A4 for input and pin B3,B4,B5 for outputs. I have pin C6 and C7 for RS232. How can I set it? hope some one can help me out.Thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 12, 2007 12:34 pm |
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Use the built-in CCS pin i/o functions, such as:
| Code: |
output_high()
output_low()
output_float()
input()
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Then the compiler will set the TRIS for you automatically. You don't
have to worry about it. This is the default mode of the compiler.
(Don't enable fast i/o mode).
If you use the CCS library code to setup the UART, the compiler
will automatically handle setting up the correct TRIS for the UART.
Example:
| Code: | | #use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS) |
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TheBeginner
Joined: 10 Apr 2007
Posts: 18
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| Posted: Thu Apr 12, 2007 4:02 pm |
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yeah PCM programmer is right,also if u wanna change the default mode you can do it by somethong like that
SET_TRIS_A(0xff) //all the A ports are input
SET_TRIS_A(0x0f) // A0,A1,A2,A3 are input and the other A4,A5.. are output
the same thing with other ports |
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teongkia
Joined: 12 Apr 2007
Posts: 7
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| Posted: Sun Apr 15, 2007 8:47 am |
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| Thanks.Hi how about I have pins A0,A1,A2 as input and A3,A4,A5 as output.How do I set it?How about port D which I not using it.Shoud I leave it or set it?If I have #USE RS232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8) should SET_TRIS_C? |
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Ttelmah
Guest
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| Posted: Sun Apr 15, 2007 9:29 am |
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Provided you don't change the I/O mode, you don't 'have' to do _anything_!.
Basically if you perform an input operation from a pin, _that pin_gets set as an input. If you use an output operation, that pin gets set as an output.
Now the one 'exception' in what you mention, would be the 'unused' port. Basically, the default (unless you perform an I/O operation), is for a port to wake up as inputs. Now what you should do with an unused port, depends onyour external wiring. If it is physically disconnected from anything at all, then the easiest choice, would be to execute:
output_d(0);
This will set the whole port as 'outputs', and turn on the drivers to pull the pins down. On CMOS logic, it makes little difference, whether you drive down or up, and in one sense, driving 'down' is potentially slightly safer.
The alternative, is to provide an external resistor to each pin, pulling it to +5v, or 0v.
I anything at all is attached to the pins (even if not in 'use'), then you need to find out whether this device draws less current with the pins pulled high or low, or if it drives the pins itself.
Now you mention using 'A4' as an output. One caveat. On a lot of chips, A4, only has a 'pull down' output driver, and requires a pull up resistor, to be used as an output (commonly called an 'open collector' driver, from the earlier designs that used this). The 877 is like this. Personally, I'd use this pin as one of your inputs, and select another pin for output, unless you want this type of driver.
Best Wishes |
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teongkia
Joined: 12 Apr 2007
Posts: 7
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| Posted: Sun Apr 15, 2007 10:04 am |
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Hi really thanks for your information. Now I am doing a project on car security system which connects PIC16F877 to Sony Ericsson T630 using MAX232. I have this code but couldn't run. Can you check for me what's is going wrong for the code?My basic operation is when i have 5V input on remote pin, it will activate the system and any sensor triggered will send output for siren pin and call the specific number using AT command.Hope you can help me out.Thanks.
| Code: | //Preprocessor
#INCLUDE <16F877>
#FUSES HS,NOWDT,NOLVP
#USE DELAY(clock=12000000)
#USE RS232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
//Define pin
#DEFINE SIREN PIN_B5
#DEFINE CL1 PIN_B4
#DEFINE CL2 PIN_B3
#DEFINE ULTRA PIN_A0
#DEFINE TOUCH PIN_A1
#DEFINE LIGHT PIN_A2
#DEFINE REMOTE PIN_A3
#DEFINE DOOR PIN_A4
//Global declaration
int A,B,C,D,RC,EN;
int RC1[2];
char SENSOR1, SENSOR2, SENSOR3, SENSOR4, TEMP;
char S[51];
//Sound siren
void SIREN_ON()
{
OUTPUT_HIGH(SIREN);
DISABLE_INTERRUPTS(INT_RTCC);
}
//Unlock doors
void UNLOCK()
{
OUTPUT_HIGH(CL1);
OUTPUT_LOW(CL2);
}
//Lock doors
void LOCK()
{
OUTPUT_LOW(CL1);
OUTPUT_HIGH(CL2);
}
//Ultrasonic sensor triggered
void SEND_CALL1()
{
PRINTF("ATD016456789;\n\r");
}
//Touch sensor triggered
void SEND_CALL2()
{
PRINTF("ATD016456789;\n\r");
}
//Light sensor triggered
void SEND_CALL3()
{
PRINTF("ATD016456789;\n\r");
}
//Door sensor triggered
void SEND_cALL4()
{
PRINTF("ATD016456789;\n\r");
}
//Central lock triggered
void SEND_CALL5()
{
PRINTF("ATD016456789;\n\r");
}
#INT_RTCC
T0()
{
SENSOR1=INPUT(ULTRA);
SENSOR2=INPUT(TOUCH);
SENSOR3=INPUT(LIGHT);
SENSOR4=INPUT(DOOR);
if(SENSOR1)
{
SEND_CALL1();
SIREN_ON();
}
else if(SENSOR2)
{
SEND_CALL2();
SIREN_ON();
}
else if(SENSOR3)
{
SEND_CALL3();
SIREN_ON();
}
else if(SENSOR4)
{
SEND_CALL4();
SIREN_ON();
}
}
#INT_RDA
SERIAL()
{
//Optional
if(kbhit())
{
TEMP=GETC();
if(A<50)
{
S[A]=TEMP;
A++;
}
else
{
A=0;
S[A]=TEMP;
A++;
}
}
DELAY_MS(100);
return A,S;
}
//Main function
void MAIN()
{
SET_RTCC(0);
SETUP_COUNTERS(RTCC_INTERNAL,RTCC_DIV_64);
EXT_INT_EDGE(0,H_TO_L);
ENABLE_INTERRUPTS(INT_RDA);
ENABLE_INTERRUPTS(GLOBAL);
SET_TRIS_A(0b00011111);
SET_TRIS_B(0x01);
SET_TRIS_D(0x00);
DELAY_MS(5000);
PRINTF("\n\rATZ\n\r");
DELAY_MS(500);
PRINTF("\n\rAT\n\r");
DELAY_MS(500);
PRINTF("\n\rAT+CNMI=2,3,0,0,0\n\r");
DELAY_MS(500);
PRINTF("\n\rAT+CPMS=\"ME\",\"ME\",\"ME\"\n\r");
SENSOR1==0;
SENSOR2==0;
SENSOR3==0;
SENSOR4==0;
A=0;
B=0;
C=0;
D=0;
EN=0;
RC=0;
UNLOCK();
//Checking system activation
while(1)
{
RC=(INPUT(REMOTE)^0);
RC1[0]=RC;
//Checking for rising and falling edge
if((RC1[0]==1 && RC1[1]==0)||(RC1[0]==0 && RC1[1]==1))
{
EN=(EN^1);
if(EN==1)
{
LOCK();
ENABLE_INTERRUPTS(INT_RTCC);
}
else if(EN==0)
{
UNLOCK();
DISABLE_INTERRUPTS(INT_RTCC);
}
}
RC1[1]=RC;
}
}
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Ttelmah
Guest
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| Posted: Sun Apr 15, 2007 10:15 am |
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You cannot 'return' anything from an interrupt.
Your delay in INT_RDA, ensures that if more than two characters come, the UART will overflow.
The same applies to INT_RTCC. It takes a long time to print a string like you are doing, and this will result in both any serial interrupts being missed, and the interrupt already having retriggered, before it returns. You need to rethink, and just set a flag in the interrupt, and do all these slow operations, only in the main. The general rule is _keep interrupt handlers fast_.
Best Wishes |
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teongkia
Joined: 12 Apr 2007
Posts: 7
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| Posted: Sun Apr 15, 2007 10:34 am |
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| Hi Ttelmah thanks for your information.Can you guide me on how to set flag in interrupt in order to make the code work?May I know is there any error on other parts of the code?Thanks. |
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Guest
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| Posted: Sun Apr 15, 2007 12:31 pm |
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| Code: |
int IntXXXFlag = FALSE;
void main(){
while (TRUE){
if (IntXXXFlag == TRUE){
printf("Int handler was executed");
IntXXXFlag = FALSE;
}
}
}
#INT_XXX //your choice, RDA, INT, TIMER, etc
void IntHandler(){
//int happened, set flag
IntXXXFlag = TRUE;
}
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Ttelmah
Guest
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| Posted: Sun Apr 15, 2007 2:33 pm |
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And, for the serial, look at ex_sisr, which shows how to receive data into a buffer.
Best Wishes |
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teongkia
Joined: 12 Apr 2007
Posts: 7
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| Posted: Fri Apr 20, 2007 11:41 am |
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Hi I tried on this way on my code but It still didn't work on my PIC.When I switch on the power supply, the siren(PIN_B5) would have output immediately without triggering any sensor.And my remote control does not work too.Anyone can help?Thanks.
| Code: | //Preprocessor
#INCLUDE <16F877A.H>
#FUSES HS,NOWDT,NOLVP
#USE DELAY(clock=12000000)
#USE RS232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
//Define pin
#DEFINE SIREN PIN_B5
#DEFINE CL1 PIN_B4
#DEFINE CL2 PIN_B3
#DEFINE ULTRA PIN_A0
#DEFINE TOUCH PIN_A1
#DEFINE LIGHT PIN_A2
#DEFINE REMOTE PIN_A3
#DEFINE DOOR PIN_A4
//Global declaration
int A,B,C,D,RC,EN;
int RC1[2];
int IntRTCCFlag = FALSE;
char SENSOR1, SENSOR2, SENSOR3, SENSOR4;
void main(){
while (TRUE){
if (IntRTCCFlag == TRUE){
printf("Int handler was executed");
IntXXXFlag = FALSE;
}
}
}
//Sound siren
void SIREN_ON()
{
OUTPUT_HIGH(SIREN);
DISABLE_INTERRUPTS(INT_RTCC);
}
//Unlock doors
void UNLOCK()
{
OUTPUT_HIGH(CL1);
OUTPUT_LOW(CL2);
}
//Lock doors
void LOCK()
{
OUTPUT_LOW(CL1);
OUTPUT_HIGH(CL2);
}
//Ultrasonic sensor triggered
void SEND_CALL1()
{
PRINTF("ATD0166827272;\n\r");
}
//Touch sensor triggered
void SEND_CALL2()
{
PRINTF("ATD0166827272;\n\r");
}
//Light sensor triggered
void SEND_CALL3()
{
PRINTF("ATD0166827272;\n\r");
}
//Door sensor triggered
void SEND_CALL4()
{
PRINTF("ATD0166827272;\n\r");
}
//Central lock triggered
void SEND_CALL5()
{
PRINTF("ATD0166827272;\n\r");
}
#INT_RTCC
void IntHandler(){
//int happened, set flag
IntRTCCFlag = TRUE;
}
T0()
{
SENSOR1=INPUT(ULTRA);
SENSOR2=INPUT(TOUCH);
SENSOR3=INPUT(LIGHT);
SENSOR4=INPUT(DOOR);
if(SENSOR1)
{
SEND_CALL1();
SIREN_ON();
}
else if(SENSOR2)
{
SEND_CALL2();
SIREN_ON();
}
else if(SENSOR3)
{
SEND_CALL3();
SIREN_ON();
}
else if(SENSOR4)
{
SEND_CALL4();
SIREN_ON();
}
}
//Main function
void MAIN()
{
SET_RTCC(0);
SETUP_COUNTERS(RTCC_INTERNAL,RTCC_DIV_64);
EXT_INT_EDGE(0,H_TO_L);
ENABLE_INTERRUPTS(GLOBAL);
SET_TRIS_A(0x3F);
SET_TRIS_B(0x01);
//SET_TRIS_C(0x0F);
SET_TRIS_D(0x00);
DELAY_MS(5000);
PRINTF("\n\rATZ\n\r");
DELAY_MS(500);
PRINTF("\n\rAT\n\r");
DELAY_MS(500);
PRINTF("\n\rAT+CNMI=2,3,0,0,0\n\r");
DELAY_MS(500);
A=0;
B=0;
C=0;
D=0;
EN=0;
RC=0;
UNLOCK();
//Checking system activation
while(1)
{
RC=(INPUT(REMOTE)^0);
RC1[0]=RC;
//Checking for rising and falling edge
if((RC1[0]==1 && RC1[1]==0)||(RC1[0]==0 && RC1[1]==1))
{
EN=(EN^1);
if(EN==1)
{
LOCK();
ENABLE_INTERRUPTS(INT_RTCC);
}
else
{
UNLOCK();
DISABLE_INTERRUPTS(INT_RTCC);
}
}
RC1[1]=RC;
}
}
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andys
Joined: 23 Oct 2006
Posts: 175
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| SET_TRIS_A(0XFF) |
| Posted: Tue May 01, 2007 1:31 pm |
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when all ports A is input i write
SET_TRIS_A(0XFF)
when all ports A is outpus
how to write that???? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue May 01, 2007 1:54 pm |
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Download the CCS manual here:
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Look in the section on "Set_Tris_A". Read the sub-section called
"Function". There are two sentences near the end, which explain
exactly what parameters are used to set the pins as inputs or outputs. |
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tiryaka
Joined: 01 May 2007
Posts: 8
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| Re: SET_TRIS_A(0XFF) |
| Posted: Fri May 04, 2007 4:19 am |
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| andys wrote: | when all ports A is input i write
SET_TRIS_A(0XFF)
when all ports A is outpus
how to write that???? |
SET_TRIS_A(0X00); |
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