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kongfu1
Joined: 26 Apr 2010
Posts: 56
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| RS232 is not working with PCD |
 Posted: Thu May 03, 2012 5:30 pm |
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With PCD version 4.132 and PIC24EP512GU810, RS232 is not working and IOs are OK. See code below:
| Code: |
#include "24EP512GU810.h"
#fuses PR_PLL, NOIESO, NOWDT
#fuses XT, OSCIO
#use delay(clock=60M)
#pin_select U1TX=PIN_F5
#pin_select U1RX=PIN_F4
#use rs232(baud=9600, xmit=PIN_F5, rcv=PIN_F4,bits=8,parity=N,stop=1,stream = UART1)
void main(void)
{
int i=0;
printf("hello!!\r\n");
for(;;)
{
output_toggle(PIN_A0);
output_toggle(PIN_A1);
output_toggle(PIN_A2);
output_toggle(PIN_A3);
output_toggle(PIN_A4);
output_toggle(PIN_A5);
output_toggle(PIN_A6);
output_toggle(PIN_A7);
delay_ms(100);
fprintf(UART1,"total counter=%d\r\n",i);
}
while(1);
}
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Please help.
Thanks,
Howard |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Fri May 04, 2012 1:48 am |
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You need to use:
| Code: |
#include "24EP512GU810.h"
#fuses PR_PLL, NOIESO, NOWDT
#fuses XT, OSCIO
#use delay(clock=60M)
#pin_select U1TX=PIN_F5
#pin_select U1RX=PIN_F4
#use rs232(baud=9600, UART1,bits=8,parity=N,stop=1,stream = UART1)
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Basically, you must _not_ put the pin numbers into the #USR RS232 declaration. Just 'UART1', which says 'talk to hardware UART1'. The select lines connect the pins to this UART.
Have you actually tested the system oscillates and is clocking at the right speed?. Two comments:
1) OSCIO - not legal with XT
2) Note2, Fig 9.1.
Best Wishes |
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kongfu1
Joined: 26 Apr 2010
Posts: 56
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| Posted: Fri May 04, 2012 10:26 am |
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| Ttelmah wrote: | You need to use:
| Code: |
#include "24EP512GU810.h"
#fuses PR_PLL, NOIESO, NOWDT
#fuses XT, OSCIO
#use delay(clock=60M)
#pin_select U1TX=PIN_F5
#pin_select U1RX=PIN_F4
#use rs232(baud=9600, UART1,bits=8,parity=N,stop=1,stream = UART1)
|
Basically, you must _not_ put the pin numbers into the #USR RS232 declaration. Just 'UART1', which says 'talk to hardware UART1'. The select lines connect the pins to this UART.
Have you actually tested the system oscillates and is clocking at the right speed?. Two comments:
1) OSCIO - not legal with XT
2) Note2, Fig 9.1.
Best Wishes |
Ttelmah,
Thanks for the help. I made changes:
#use rs232(baud=9600, bits=8,parity=N,stop=1,stream = UART1)
and removed OSCIO. There is no difference on the result.
Also, I have found out the clock is about 1.76 second instead of 1 second. It is much slower then specified. Do not know why. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Fri May 04, 2012 2:36 pm |
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Start by telling it your oscillator frequency.....
How do you expect the code to know how to generate 60M, when you aren't telling it the crystal frequency?. Key is that it has to know what the XT crystal is running at to calculate the PLL divider. So you need (clock=yyy,crystal=xxx) so the calculation can be done.
Best Wishes |
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kongfu1
Joined: 26 Apr 2010
Posts: 56
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| Posted: Fri May 04, 2012 6:41 pm |
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| Ttelmah wrote: | Start by telling it your oscillator frequency.....
How do you expect the code to know how to generate 60M, when you aren't telling it the crystal frequency?. Key is that it has to know what the XT crystal is running at to calculate the PLL divider. So you need (clock=yyy,crystal=xxx) so the calculation can be done.
Best Wishes |
Internal RC was selected:
| Code: |
#fuses PR,FRC_PLL,NOWDT,ICSP1,NOJTAG
#device ADC=12
#use delay(clock=60M,internal)
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It works OK now. Thanks. |
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