MicroSD - SD card FAT32 newbie

[xapmanis]

Hello there,
Im trying 4-5 days now to understand how to read and write a .txt file from a microSD card with SPI method.
I have read many posts here on melabs forums but i still didn't manage to handle a read/write at the card.

I used PIC18F26K22 with osc 8MHz x4PLL = 32Mhz. I use Hserout for debugging and hardwareSPI for the data communication betwen the MCU and the card, which are

' Alias PIC pins and registers
SDO		Var	PORTC.5	' SPI data out
SDO_TRIS	Var	TRISC.5	' SPI data out direction

SDI		Var	PORTC.4	' SPI data in
SDI_TRIS	Var	TRISC.4	' SPI data in direction

SCL		Var	PORTC.3	' SPI clock
SCL_TRIS	Var	TRISC.3	' SPI clock direction

SD_CS		Var	PORTC.2	' SD card chip select
SD_CS_TRIS	Var	TRISC.2	' SD card chip select direction

I want to work with FAT32 format for my project and just to read for starters a txt file. I used a file i found in a post SDFSHC32D.bas and tried to adjust it with to my MCU. There was 2 pins SD_WE and SD_CD that i changed them into:

'SD_CD		Var	PORTB.4	' SD card detect
'SD_CD_TRIS	Var	TRISB.4	' SD card detect direction

SD_CD       var bit  ' SD card detect Pseudo bit
SD_CD_TRIS  var bit  ' SD card detect direction Pseudo bit
SD_CD_used	Var	Bit	'flag to determine if CD is used or not
SD_CD_used = 0	'SD_CD not used

'SD_WE		Var	PORTA.4	' SD card write protect
'SD_WE_TRIS	Var	TRISA.4	' SD card write protect direction

SD_WE       var bit  ' SD card write protect Pseudo bit
SD_WE_TRIS  var bit  ' SD card write protect direction Pseudo bit
SD_WE_used	var	bit	'flag to determine if WE is used or not
SD_WE_used = 0	'SD_WE not used

Do you think this could cause any problems ?? The thing is that i dont want to use Card Detection or Write Protection... I didn't know any other way to skip them so i did change them into bit variables



My code is this:

'DEFINES  

include "modedefs.bas"
include "fuses_18f26k22.bas"
include "eusart_defines_ep7.bas"
DEFINE OSC 8



'  REGISTERS 
TRISA= %00000000  
TRISB= %00000011
TRISC= %00010000
'CMCON= 7 'Comparator module OFF
INTCON=  %11000000 'Set Pheripheral Interrupts And INT0IE
INTCON2.7= 1
'INTCON3.3= 1
'PIE1.5= 1 'RC1IE: EUSART1 Receive Interrupt Enable bit
ANSELA=0
ANSELB=0
ANSELC=0

include "SDFSHC32D.bas"
SDC_UseHardSPI = TRUE


'   Initialization  
Init:
  PORTB= 0
  PORTA= 0
  PORTC= 0
  hserout ["Init routine: OK!",13,10]
  PAUSE 100

' Main 
Main:
  hserout ["Before FSInit ",dec fat_error]
  Gosub FSInit
  pause 10
  Gosub FSInit
  hserout ["FSInit FAT_error= ",dec fat_error]
	If (FAT_error != 0) Then 
	  hserout ["FSInit FAT_error= ",dec fat_error]
	endif
  FAT_FileName[0] = "N" 
  FAT_FileName[1] = "A" 
  FAT_FileName[2] = "M"
	FAT_FileName[3] = "E" 
  FAT_FileName[4] = "S" 
  FAT_FileName[5] = " "
	FAT_FileName[6] = " " 
  FAT_FileName[7] = " "
	FAT_FileName[8] = "T" 
  FAT_FileName[9] = "X" 
  FAT_FileName[10]= "T"    
  
  FAT_mode = "r"		' Read mode
  Gosub FSfopen
  hserout ["FSOpen FAT_error= ",dec fat_error]
	If (FAT_error != 0) Then
	  hserout ["FSOpen FAT_error= ",dec fat_error]
  endif
  FAT_count = 1		' Read 1 byte to buffer at a time
  Gosub FSfread
	While (FAT_error = 0)
		Hserout [FAT_dest[0]]
		FAT_count = 1	' Read 1 byte to buffer at a time
    Gosub FSfread
	Wend  
	pause 500

goto Main                        
end

I hope someone could drop any ideas because im new with Cards and im stuck !!!

[mackrackit]

What is the error shown?
But, as far as I know you need to run the MCU at 40MHz plus.
and
I will suggest you get this working with the code from MeLabs first.

[xapmanis]

Hello mackrackit,
i found that there is a problem with FSinit subroutine, pic's programm stuck in waitforcmdtimeout loop of SDFSHC32d file without returning to main programm. I tried a fix that a user(Alexey) did and worked out!!

....
....
loopcount var byte
loopcount= 0
waitforcmdtimeout:
if loopcount = 255 then
SD_CS = 1
return
endif
loopcount = loopcount +1 'ExtraCode
....
....

But i got responce :
FAT_error= 6 SDC_status= 1 SDC_response= 255
FAT_error= 7 SDC_status= 1 SDC_response= 255

Also i forgot to say that i run the program at 32Mhz but still same results. Q: Is there need of 40Mhz ++ speeds ?? Isn't 32Mhz enough ?
I think MeLabs has code only for FAT16 and not for FAT32 example. Anyhow i'll use your advise and try to use one FAT16 example when i get my hands on 1 2Gb or less microSD

[xapmanis]

As it seems it's a pitty... But picbasic can't handle SD/microSD FAT32 formated cards yet... I hope someone in the future will add Statements, include files etc etc for this work.