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The SD_File_System module is a macro library for use with Library Manager by JohnGB. This module has been written by Steven Wright (swright on PDS forum). The library module is offered on an as-is basis with no warranty as to its effectiveness, operation or reliability. Users use it at their own risk.
Feature summary
- Macros for accessing Secure Digital (SD) or Multimedia Memory Card (MMC) cards – SD_Init, SD_Sector, SD_Read and SD_Write.
- Macros for writing files to these cards in the FAT16 format – such files can be read directly by a PC, using a card reader. The commands include SD_Init_FS, SD_Check_For_File, SD_New_File, SD_Append_File, SD_Write_Byte_To_File, SD_Write_String_To_File, SD_Save_File and SD_Close_File. Also commands for reading files, including SD_Open_File and SD_Read_Byte_From_File. Also file and disk management commands, including SD_Delete_File, SD_Free_Space, SD_Disk_Size, SD_Dir and SD_Psuedo_Format.
Download module
Download: SD_File_SystemExample 1
Code:
Device = 18F4550
XTAL = 20
'-----------------------------------------------------------
ALL_DIGITAL = TRUE
'-----------------------------------------------------------
HSERIAL_BAUD = 115200 'Setup RS232 port
HSERIAL_RCSTA = 010000
HSERIAL_TXSTA = 100100
'-----------------------------------------------------------
Dim Response As Byte
Dim SD_IO As Byte
'-----------------------------------------------------------
Symbol SD_CS = PORTD.2 'SPI CS to SD CS (SD pin 1)
Symbol SD_DI = PORTD.5 'SPI DO to SD DI (SD Pin 2)
Symbol SD_CLK = PORTD.3 'SPI CLK to SD CLK (SD Pin 5)
Symbol SD_DO = PORTD.4 'SPI DI to SD DO (SD Pin 7)
'-----------------------------------------------------------
Include "SD_MMC_Read_File_Lib.pbp" 'Include managed library file
'-----------------------------------------------------------
GoTo Over_Sub 'Jump over the subroutines
'-----------------------------------------------------------
Over_Sub:
DelayMS 200
'-----------------------------------------------------------
Main_Prog:
HSerOut ["INSERT SD OR MMC",13]
Repeat
Response = SD_Init_FS
Until Response = 0
HSerOut ["OPENING FILE",13]
SD_File_Name = "TEST001" 'File Name, upper case only!
SD_File_Ext = "TXT" 'File Ext, upper case only!
Response = SD_Open_File
If Response = 1 Then
HSerOut ["FILE NOT FOUND",13]
Stop
EndIf
HSerOut ["FILE OPEN",13]
While SD_EOF < 1
Response = SD_Read_Byte_From_File
HSerOut [Response]
Wend
'-----------------------------------------------------------
Finish:
HSerOut [13]
HSerOut ["FINISHED",13]
Stop
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