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PIC16F628A : Just take a look

 
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tomay3000



Joined: 11 Jul 2010
Posts: 3

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PIC16F628A : Just take a look
PostPosted: Sun Jul 11, 2010 7:24 pm     Reply with quote
I made an RS232 Serial External SPI FLASH Programmer for Winbond EEPROMs series. & the only function that works great is just reading

So can anyone help me to solve my problems

This is my PIC16F628A driver code for Winbond W25Xxx W25Xxx.C:

Code:
///////////////////////////////////////////////////////////////////////////
////   Library for a Winbond W25Xxx (128 KB --> 16 MB)                 ////
////                                                                   ////
////   init_ext_eeprom();    Call before the other functions are used  ////
////                                                                   ////
////   write_ext_eeprom(a, d);  Write the byte d to the address a      ////
////                                                                   ////
////   d = read_ext_eeprom(a);   Read the byte d from the address a    ////
////                                                                   ////
////   b = ext_eeprom_ready();  Returns TRUE if the eeprom is ready    ////
////                            to receive opcodes                     ////
////                                                                   ////
////   The main program may define EEPROM_SELECT, EEPROM_DI, EEPROM_DO ////
////   and EEPROM_CLK to override the defaults below.                  ////
////                                                                   ////
////                                                                   ////
////                      Pin Layout                                   ////
////   -----------------------------------------------                 ////
////   |    __                                       |                 ////
////   | 1: CS   EEPROM_SELECT | 8: VCC   +5V        |                 ////
////   |                       |    ____             |                 ////
////   | 2: DO   EEPROM_DO     | 7: HOLD  +5V        |                 ////
////   |    __                 |                     |                 ////
////   | 3: WP   +5V           | 6: CLK   EEPROM_CLK |                 ////
////   |                       |                     |                 ////
////   | 4: GND  Ground        | 5: DIO   EEPROM_DI  |                 ////
////   -----------------------------------------------                 ////
////                                                                   ////
///////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996, 2003 Custom Computer Services          ////
//// This source code may only be used by licensed users of the CCS C  ////
//// compiler.  This source code may only be distributed to other      ////
//// licensed users of the CCS C compiler.  No other use, reproduction ////
//// or distribution is permitted without written permission.          ////
//// Derivative programs created using this software in object code    ////
//// form are not restricted in any way.                               ////
///////////////////////////////////////////////////////////////////////////

#ifndef EEPROM_SELECT

#define EEPROM_SELECT PIN_A0
#define EEPROM_CLK    PIN_A1
#define EEPROM_DI     PIN_A2
#define EEPROM_DO     PIN_A2

#endif

#define EEPROM_ADDRESS  int32

void init_ext_eeprom()
{
   output_high(EEPROM_SELECT);
   output_low(EEPROM_DI);
   output_low(EEPROM_CLK);
}

BOOLEAN ext_eeprom_ready()
{
   BYTE rdsr, i, data;
   
   rdsr = 0x05;                  // rdsr opcode
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<8; ++i)
   {
      output_bit(EEPROM_DI, shift_left(&rdsr, 1, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   for(i=0; i<8; ++i)
   {
      output_high(EEPROM_CLK);
      shift_left(&data, 1, input(EEPROM_DO));
      output_low(EEPROM_CLK);    // data latches & back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   return !bit_test(data, 0);
}

void erase_ext_eeprom()
{
   BYTE i, wren, erase;
   
   wren = 0x06;                  // wren opcode
   erase = 0xc7;                 // chip erase
   
   // Wait until the eeprom is done with a previous write
   while(!ext_eeprom_ready());
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<8; ++i)
   {
      output_bit(EEPROM_DI, shift_left(&wren, 1, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<8; ++i)
   {
      output_bit(EEPROM_DI, shift_left(&erase, 1, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   delay_ms(40000);              // tCE
}

void write_ext_eeprom(EEPROM_ADDRESS address, BYTE data)
{
   BYTE cmd[5], i, wren;
   
   wren = 0x06;                  // wren opcode
   cmd[0] = data;
   cmd[1] = (BYTE) address;
   cmd[2] = (BYTE) (address >> 8);
   cmd[3] = (BYTE) (address >> 16);
   cmd[4] = 0x02;
   
   // Wait until the eeprom is done with a previous write
   while(!ext_eeprom_ready());
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<8; ++i)
   {
      output_bit(EEPROM_DI, shift_left(&wren, 1, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<40; ++i)
   {
      output_bit(EEPROM_DI, shift_left(cmd, 5, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   delay_ms(3);                  // tPP
}

BYTE read_ext_eeprom(EEPROM_ADDRESS address)
{
   BYTE cmd[4], i, data;
   
   cmd[0] = (BYTE) address;
   cmd[1] = (BYTE) (address >> 8);
   cmd[2] = (BYTE) (address >> 16);
   cmd[3] = 0x03;
   
   // Wait until the eeprom is done with a previous write
   while(!ext_eeprom_ready());
   
   output_low(EEPROM_SELECT);
   
   for(i=0; i<32; ++i)
   {
      output_bit(EEPROM_DI, shift_left(cmd, 4, 0));
      output_high(EEPROM_CLK);   // data latches
      output_low(EEPROM_CLK);    // back to idle
   }
   
   for(i=0; i<8; ++i)
   {
      output_high(EEPROM_CLK);
      shift_left(&data, 1, input(EEPROM_DO));
      output_low(EEPROM_CLK);    // data latches & back to idle
   }
   
   output_high(EEPROM_SELECT);
   
   return(data);
}


and Winbond W25Xxx SPI Flash Programmer.h file:

Code:
#include <16F628A.h>

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES HS                       //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES PUT                      //Power Up Timer
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOBROWNOUT               //No brownout reset
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                    //No EE protection

#use delay(clock=20000000)
#use rs232(baud=115200,parity=N,xmit=PIN_B2,rcv=PIN_B1,bits=8)


and the main program is Winbond W25Xxx SPI Flash Programmer.c:

Code:
#include "Winbond W25Xxx SPI Flash Programmer.h"
#include "W25Xxx.C"
#include <stdio.h>

BYTE cmd[5], co = 0, data = 'X';
int32 address;

#int_TBE
void  TBE_isr(void)
{
   disable_interrupts(INT_TBE);
   
   switch(cmd[0])
   {
      case 'E':
         putc('S');
      break;
     
      case 'W':
         putc('S');
      break;
     
      case 'R':
         putc(data);
      break;
   }
   
   enable_interrupts(INT_RDA);
}

#int_RDA
void  RDA_isr(void)
{
   cmd[co ++] = getc();
   
   if(co == 5)
   {
      disable_interrupts(INT_RDA);
     
      co = 0;
     
      address = ((int32) cmd[1]) << 16;
      address |= ((int32) cmd[2]) << 8;
      address |= (int32) cmd[3];
     
      switch(cmd[0])
      {
         case 'E':
            erase_ext_eeprom();
         break;
         
         case 'W':
            write_ext_eeprom(address, cmd[4]);
         break;
         
         case 'R':
            data = read_ext_eeprom(address);
         break;
      }
     
      enable_interrupts(INT_TBE);
   }
}

void main()
{
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_ccp1(CCP_OFF);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   
   init_ext_eeprom();
   
   disable_interrupts(INT_TBE);
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);

   //TODO: User Code
   
   while(TRUE);
}


So where could the problem be Exclamation Question

Thank you any way ;)
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PIC16F628A
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jul 11, 2010 11:43 pm     Reply with quote
Post the full part number of the eeprom that you're testing, and post a
link to the eeprom data sheet, and post your compiler version.

I suggest simplifying the program. Get rid of the #int_rda and #int_tbe
routines until you get the eeprom working reliably.

Also, your posted code looks like it's a CCS driver, but I don't find any
such driver in the CCS directories. I don't find it if I search the net with
Google. So I could be wrong, but I think you've created an invention
and tacked the CCS copyright message on it.
tomay3000



Joined: 11 Jul 2010
Posts: 3

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PostPosted: Mon Jul 12, 2010 8:26 am     Reply with quote
PCM programmer wrote:
Post the full part number of the eeprom that you're testing, and post a
link to the eeprom data sheet, and post your compiler version.

I suggest simplifying the program. Get rid of the #int_rda and #int_tbe
routines until you get the eeprom working reliably.

Also, your posted code looks like it's a CCS driver, but I don't find any
such driver in the CCS directories. I don't find it if I search the net with
Google. So I could be wrong, but I think you've created an invention
and tacked the CCS copyright message on it.


Sorry for my previous post
& for the full part number of my SPI EEPROM is : W25X40A
& a link to its datasheet is : http://www.winbond.com.tw/NR/rdonlyres/93A5FE5A-EEF2-417B-87A8-CB8144F6120D/0/W25X10A_W25X20A_W25X40A_W25X80A.pdf
& my compiler version is : 4.106
& for the W25Xxx.C driver, I crated it using the athor drivers samples.
& I did this test program test.h:

Code:
#include <16F628A.h>

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES HS                       //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES PUT                      //Power Up Timer
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOBROWNOUT               //No brownout reset
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD                    //No EE protection

#use delay(clock=20000000)
#use rs232(baud=115200,parity=N,xmit=PIN_B2,rcv=PIN_B1,bits=8)


& the test.c main program is :

Code:
#include "test.h"
#include <stdio.h>

void main()
{
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_ccp1(CCP_OFF);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);

   //TODO: User Code
   while(TRUE)
      putc(getc());
}


& I always receive what I sent to the PIC. So it is working

This is an image of my EEPROM Programmer :
http://www.wuala.com/tomay3000/Documents/Electronics/EEPROM%20Programmer.JPG

& the JDM Programmer for the PIC :
http://www.wuala.com/tomay3000/Documents/Electronics/JDM%20Programmer.JPG
_________________
PIC16F628A

Last edited by tomay3000 on Sat Jul 17, 2010 10:23 am; edited 1 time in total
tomay3000



Joined: 11 Jul 2010
Posts: 3

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PostPosted: Wed Jul 14, 2010 11:09 am     Reply with quote
Finally, I found the solution. The problem was in the VCC voltage, so the Winbond SpiFlash supports a range of (2.7 --> 3.6) volts, not 5 volts, so I found that my Winbond W25Xxx SpiFlash is gone with a 5 volts Sad Crying or Very sad & my PIC16F628A is working great.
_________________
PIC16F628A
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