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16F688 and 16f627A issues

 
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ralph79



Joined: 29 Aug 2007
Posts: 87

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16F688 and 16f627A issues
PostPosted: Wed Aug 29, 2007 8:59 am     Reply with quote
Hi,
I've been working with CCS compiler V4.0.038 and I have a very strange problem. I have basically the same code as you can you above for the 627A and for the 688. But with the 16F627 in the rs232 port I receive the same characters I send. But with the 688 the characters are all wrong. Does anybody know why is this happening?

Code for 627A
Code:

#include <16F627A.h>

#fuses INTRC_IO, NOWDT, NOPROTECT, NOMCLR, NOBROWNOUT, NOCPD, PUT

#define max_buf_length      10

#use delay(clock=8000000)
#use rs232(baud=1200, parity=N, xmit=PIN_B2, rcv=PIN_B1, bits=8, errors)

int8 rcv_data[max_buf_length] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
int8 rcv_pointer = 0;
int8 pos_eeprom = 0;
short int values_rcv = 0;

#int_RDA   // rs232 receive data available
void RDA_isr(void)
{
   int8 ch = 0;
   ch = getchar();
   rcv_data[rcv_pointer++] = ch;            // store data
   if (rcv_pointer == 10)
   {
      values_rcv = 1;
   }
}

void main(void)
{   
   int8 i = 0;
   port_b_pullups(TRUE);
   set_tris_b(0x01); // PIN_B1 as input
   setup_vref(FALSE);
   disable_interrupts(INT_RDA);
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);
   while (1)
   {
      if (values_rcv == 1)
      {
         for (i = 0; i < rcv_pointer; i++)
         {
            write_eeprom(pos_eeprom++, rcv_data[i]);
            rcv_data[i] = 0;   // cleaning the buffer
         }
         pos_eeprom = pos_eeprom + 2;
         values_rcv = 0;   // reset variables
         rcv_pointer = 0;
      }
   }
}


Code for 688

Code:

#include <16F688.h>

#device *=16
#device adc=8

#fuses INTRC_IO, NOWDT, NOPROTECT, NOMCLR, NOBROWNOUT, NOCPD, PUT, NOIESO, NOFCMEN

#define max_buf_length      10

#use delay(clock=8000000)
#use rs232(baud=1200, parity=N, xmit=PIN_C4, rcv=PIN_C5, bits=8, errors)

int8 rcv_data[max_buf_length] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
int8 rcv_pointer = 0;
int8 pos_eeprom = 0;
short int values_rcv = 0;

#int_RDA   // rs232 receive data available
void RDA_isr(void)
{
   int8 ch = 0;
   ch = getchar();
   rcv_data[rcv_pointer++] = ch;            // store data
   if (rcv_pointer == 10)
   {
      values_rcv = 1;
   }
}

void main(void)
{   
   int8 i = 0;
   port_a_pullups(TRUE);
   set_tris_c(0x20); // PIN_C5 as input
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF);
   setup_comparator(NC_NC);
   setup_vref(FALSE);
   setup_oscillator(OSC_8MHZ);
   disable_interrupts(INT_RDA);
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);
   while (1)
   {
      if (values_rcv == 1)
      {
         for (i = 0; i < rcv_pointer; i++)
         {
            write_eeprom(pos_eeprom++, rcv_data[i]);
            rcv_data[i] = 0;   // cleaning the buffer
         }
         pos_eeprom = pos_eeprom + 2;
         values_rcv = 0;   // reset variables
         rcv_pointer = 0;
      }
   }
}


Any help will be appreciate

Thanks in advance
SET



Joined: 15 Nov 2005
Posts: 161
Location: Glasgow, UK

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PostPosted: Thu Aug 30, 2007 9:04 am     Reply with quote
Quote:
Code:
set_tris_c(0x20); // PIN_C5 as input


I'm guessing you tried this in case the compiler wasn't setting Rx as an input? Shouldn't be required..

Quote:
But with the 16F627 in the rs232 port I receive the same characters I send. But with the 688 the characters are all wrong.

Are you missing some code? Your code puts the Rx'ed chars in EEPROM, so maybe the problem lies there?
ralph79



Joined: 29 Aug 2007
Posts: 87

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PostPosted: Thu Aug 30, 2007 9:21 am     Reply with quote
Hello,

Thanks for your response.

The set_tris_a was my ultimate test. I know that it shouldn't be required but ... I've already try everything.

This code is just a very small part of complex program.
I receive the chars from a RF receiver and, for a test, I save them to the eeprom. With this I want to know if there are any differences between the characters that I send and characters I receive during the time. With the 16F627A I don't have any trouble. But with the 688 I can't get it to work properly.
Is there any other initialization or function that I need to put in my code do get this work? Or in other words what I missed?

Thanks
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