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ljbeng
Joined: 10 Feb 2004
Posts: 205
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| PIC24, 3 serial ports |
 Posted: Thu Apr 28, 2011 8:13 am |
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Crystal 20Mhz
Compiler 4.119
24FJ128GA106
I am using all 3 of the hardware serial ports and a fourth software serial port. At top of my program, all are defined as shown:
| Code: |
#pin_select U1TX=PIN_F3//use this for gps data to gps receiver #pin_select U1RX=PIN_F2
#pin_select U3TX=PIN_G8
#pin_select U3RX=PIN_G7
#use rs232(uart1,baud=38400,parity=N,bits=8,ERRORS,stream = uar1)
#use rs232(uart2,baud=9600,parity=N,bits=8,ERRORS,stream = uar2)
#use rs232(uart3,baud=38400,parity=N,bits=8,ERRORS,stream = uar3)
#use rs232(baud=9600,parity=N,bits=8,ERRORS,stream = uar4,force_sw,xmit=PIN_b8,rcv=PIN_b9) |
All are working fine, all interrupts work as expected.
I want the user to select a function where I reroute the serial data from the software port (uar4) to the hardware port (uar3) but I don't want any baud rates involved, I just want to bit-bang in a tight loop:
| Code: |
if (routebase){
clrlcd();
printf(lcd_putc,"\tROUTE SERIAL TO BASE");
disable_interrupts(INTR_GLOBAL);
output_low(move);
output_low(steer1);
output_low(steer2);
}
if (routebase){
while(1){
if (!input(key1)) {
enable_interrupts(INTR_GLOBAL);
routebase = 0;
goto sc1;
}
output_toggle(safety);
output_bit(pin_g8,input(pin_b9));
output_bit(pin_b8,input(pin_g7));
}
}
sc1:
//rest of code
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Is the fact I already have my hardware ports defined causing this not to work? Can I change IO pins that are assigned to a #use rs232 function? |
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ljbeng
Joined: 10 Feb 2004
Posts: 205
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| Posted: Thu Apr 28, 2011 8:51 am |
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I should add, if I write a program that does not defiine the serial ports and only has these lines:
| Code: |
while(1){
output_bit(pin_g8,input(pin_b9));
output_bit(pin_b8,input(pin_g7));
}
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The program works and I get the serial redirection I want. The REAL program with serial ports defined in #use rs232, does not work. |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Thu Apr 28, 2011 8:57 am |
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Defining an output #pin_select function disconnect the pin from it's default IO function. Consult the Microchip processor datasheet for details.
Peripheral pin selects can be set dynamically by writing to the respective SFRs, but this option isn't provided by CCS C built-in functions. |
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