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odroda
Joined: 10 Feb 2014
Posts: 4
Location: Switzerland
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| PIC with SST25PF080B and CCS driver SST25vf.c |
 Posted: Mon Feb 10, 2014 7:06 am |
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Hi all,
I use the Flash Memory SST25PF080B and I use also the CCS Driver SST25vf.c, which is included in the CCS Compiler (V 4.134) driver folder.
My problem is, that i can write into and read from the Flash, but the chars they comes back are not correct.
For example: if I write 5 times the char 'h', the returned chars are "B B B B G" (Hex 42 42 42 42 47).
And the output of "Hello" returns Hex "04 4c 66 67 7f"
Any idea? Thank you very much for help!
Greets, Odroda
I have changed only two lines in the original CCS driver:
| Code: |
#define FLASH_SIZE 8388608
#define FLASH_SELECT_PIN PIN_C0 //my SST25 CE Pin |
The initialisation of the SPI is like default in the CCS driver:
| Code: |
#use spi(spi1, MODE=0, BITS=8, STREAM=FLASH_STREAM, FORCE_HW) |
For the first tests, i have written the following Main:
| Code: |
//File: main.c
//Autor: CJ
//Date: 08.02.2014
//------------------------------------------------------------------------------------
// ------- Include_und_Globale_Definitionen------------------------------------#include "16F876A.H"
#include "stdlib.h"
#fuses hs, nowdt, noprotect, put, nobrownout, nolvp
#use delay (clock = 8000000)
#include "SST25vf.c"
#INT_GLOBAL
#use standard_io(A)
#use standard_io(B)
#use standard_io(C)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7, parity=n, bits=8)
char Read;
#define CE pin_c0
#define WP pin_c1
#define Hold pin_c2
#define SCK pin_c3
#define SDI pin_c4
#define SDO pin_c5
// -------Deklaration_der_verschiedenen_Module-------------------------------------------------
void MAIN(void);
// -------Hauptprogramm------------------------------------------------------------------------
void MAIN(void)
{
FLASH_DESELECT();
output_high(Pin_A0); // Power on SST25
delay_ms(100);
output_high(WP);
output_high(Hold);
ext_flash_init();
ext_flash_protect(FLASH_PROTECT_NONE);
ext_flash_bulk_erase();
delay_ms(500);
ext_flash_write_byte(0x000030, 'H');
ext_flash_write_byte(0x000031, 'e');
ext_flash_write_byte(0x000032, 'l');
ext_flash_write_byte(0x000033, 'l');
ext_flash_write_byte(0x000034, 'o');
Read = ext_flash_read_byte(0x000030);
printf("%c ", Read);
Read = ext_flash_read_byte(0x000031);
printf("%c ", Read);
Read = ext_flash_read_byte(0x000032);
printf("%c ", Read);
Read = ext_flash_read_byte(0x000033);
printf("%c ", Read);
Read = ext_flash_read_byte(0x000034);
printf("%c ", Read);
while(TRUE)
{
}
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Mon Feb 10, 2014 12:48 pm |
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Ignoring anything else, why do you have a #INT_GLOBAL line?.
And, even worse, why where it is?.
This says that the function declared immediately after it, is the global interrupt handler. It must not exist without a function immediately after it, and will probably result in some function (probably part of the RS232!), being placed as the interrupt handler, when you don't use interrupts at all.... |
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odroda
Joined: 10 Feb 2014
Posts: 4
Location: Switzerland
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| Posted: Mon Feb 10, 2014 11:28 pm |
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Many thanks for your answer Ttelmah!
O, you're right. This line is too much. That comes from the copy and paste.
I've removed now. That alone has the problem not been solved. |
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odroda
Joined: 10 Feb 2014
Posts: 4
Location: Switzerland
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| Posted: Fri Feb 21, 2014 2:36 am |
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I have tested the in- and outputs of the SST25PF080B with the Logic Analyzer.
The results can you see on bottom.
WP* = high
Hold* = high
ext_flash_init()
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 30 CE* = low
Idle CE* = high
SDI 04 SDO 00 CE* = low //Write Disable
Idle CE* = high
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 30 CE* = low
Idle CE* = high
SDI 80 SDO 00 CE* = low //Disable SO to Output RY/RB# status during AAI programming
Idle CE* = high
ext_flash_protect(FLASH_PROTECT_NONE)
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 30 CE* = low
Idle CE* = high
SDI 06 SDO 00 CE* = low //Write Enable
Idle CE* = high
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 38 CE* = low
Idle CE* = high
SDI 01 SDO 00 CE* = low //Write Satus-Register
SDI 00 SDO 00 CE* = low
Idle CE* = high
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 00 CE* = low
Idle CE* = high
SDI 06 SDO 00 CE* = low //Write Enable
Idle CE* = high
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 00 CE* = low
Idle CE* = high
SDI 01 SDO 00 CE* = low //Write Satus-Register
SDI 80 SDO 00 CE* = low //Disable SO to Output RY/RB# status during AAI programming
Idle CE* = high
ext_flash_write_byte(0x000030, 'h') //Write "h" in to adress 0x000030
SDI 05 SDO 00 CE* = low //Read Status-Register
SDi 00 SDO 00 CE* = low
Idle CE* = high
SDI 06 SDO 00 CE* = low //Write Enable
Idle CE* = high
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 00 CE* = low
Idle CE* = high
SDI 02 SDO 00 CE* = low //Program One Data Byte
SDI 00 SDO 00 CE* = low
SDI 00 SDO 00 CE* = low
SDI 30 SDO 00 CE* = low
SDI 68 SDO 00 CE* = low
Idle CE* = high
ext_flash_read_byte(0x000030) //Read Adress 0x000030
SDI 05 SDO 00 CE* = low //Read Status-Register
SDI 00 SDO 00 CE* = low
Idle CE* = high
SDI 03 SDO 00 CE* = low //Read Memory
SDI 00 SDO 00 CE* = low
SDI 00 SDO 00 CE* = low
SDI 30 SDO 00 CE* = low
SDI 00 SDO 07 CE* = low
Any idea? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Fri Feb 21, 2014 3:56 am |
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Several things:
You haven't told us what processor you are using?.
You don't show a processor file being included?.
It must be a 3.3v PIC, or level translators will be needed.
Then you are aware that SDO on the master (processor), connects to SDI on the memory (and vice versa). Calling the master output line 'SDI' in the logic analyser listing, makes me worry...
Then standard includes like stdlib, should always be _after_ the clock and serial (if being used), have been setup. Some things in these _depend_ on having the system configurations already made.
Then you don't need/want to change the original include file at all. Just set the pin you want to use, before you include the file. So:
| Code: |
#define FLASH_SELECT_PIN PIN_C0
#define FLASH_SIZE 8388608
#include "SST25vf.c"
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changes the select pin,, and memory size without having to change the include file. This is documented in the file. |
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odroda
Joined: 10 Feb 2014
Posts: 4
Location: Switzerland
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| Posted: Mon Feb 24, 2014 5:39 am |
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Dear Ttelmah,
We have an PIC16F876A and level shifter for all Connections (except the Data line from Flash to PIC).
The SDO from PIC is connected to SDI of the Flash and the SDO from Flash is connected to the PIC SDI Input.
Unfortunately your inputs didn't solve our problem. But thank you for your effort in helping to find a solution. |
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