Getting Started: Running the “Device
– Mass Storage – SD Card reader” demo
Configuration
1: PIC18F87J50 PIM + HPC Explorer
Configuration
1: PIC18F87J50 PIM + HPC Explorer
To run this project, you will need one of the
following sets of hardware:
PIC18F87J50
Plug-In-Module (PIM) (MA180021)
High
pin count (HPC) Explorer (DM183022)
SD
Card PICTail™ Plus Daughter Card (AC164122)
PIC24FJ256GB110
Plug-In-Module (PIM) (MA240014)
Explorer
16 (DM240001)
USB
PICtail Plus Daughter Card (AC164131)
SD
Card PICTail Plus Daughter Card (AC164122)
This
section describes how to set up the various configurations of hardware to run
this demo.
Configuration 1: PICDEM FS USB
Configuration 2: PIC18F87J50 PIM + HPC Explorer
Configuration 3: PIC24FJ256GB110 PIM + Explorer 16
1)
Before attaching the PIC18F87J50 PIM to the HPC Explorer board, insure that the
processor selector switch (S3) is in the “ICE” position as seen in the image
below. Failure to so will result in
difficulties in getting the PIC18F87J50 PIM to sit properly on the HPC
Explorer.
2)
Short JP4 on the PIC18F87J50 PIM. This
allows the demo board to be powered through bus power.
3)
Short JP1 such that the “R” and “U” options are shorted.
4)
Before connecting the PIC18F87J50 PIM to the HPC Explorer board, remove all
attached cables from both boards.
Connect the PIC18F87J50 PIM to the HPC Explorer board. Be careful when connecting the boards to
insure that no pins are bent or damaged during the process. Also insure that the PIM is not shifted in
any direction and that all of the headers are properly aligned.
5)
On the SD Card PICTail Plus board, short JP1, JP2, and JP3 on the side farthest
from the SD Card holder. Depending on
the revision of the board you have the silk-screen on the board may incorrectly
label the top as the “HPC-EXP” setting.
Please ignore this silk screen and place the jumpers as described above
and seen below.
6) Connect the SD Card
PICTail Plus board to the HPC Explorer board.
This may require the addition of female headers onto the HPC Explorer
board and possibly male headers on the SD Card PICTail Plus board. Make sure when connecting the two boards
together that the pin names as printed on both boards match up as they are
connected.
1)
Before attaching the PIC24FJ256GB110 PIM to the Explorer 16 board, insure that
the processor selector switch (S2) is in the “PIM” position as seen in the
image below.
2)
Short the J7 jumper to the “PIC24” setting
3)
Before connecting the PIC24FJ256GB110 PIM to the Explorer 16 board, remove all
attached cables from both boards.
Connect the PIC24FJ256GB110 PIM to the Explorer 16 board. Be careful when connecting the boards to
insure that no pins are bent or damaged during the process. Also insure that the PIM is not shifted in
any direction and that all of the headers are properly aligned.
4)
On the SD Card PICTail Plus board, short JP1, JP2, and JP3 on the side farthest
from the SD Card holder. Depending on
the revision of the board you have the silk-screen on the board may incorrectly
label the top as the “HPC-EXP” setting.
Please ignore this silk screen and place the jumpers as described above
and seen below.
5) Connect the SD Card
PICTail Plus board to the HPC Explorer board in either the female PICTail Plus
connectors. Attach the board in the top
bay of either of the connectors.
6) On the USB PICTail Plus board, short jumper
JP1. Remove all other shorts on the
board.
7) Connect the USB PICTail Plus board to either
of the female PICTail Plus connectors or on the card edge connector (J9) at the
edge of the Explorer 16 board.
To
run this project, you will need to load the corresponding firmware into the
devices. There are two methods available
for loading the demos: Precompiled demos and source code projects.
Precompiled
Demos are available in the “<Install Directory>\USB – Precompiled Demos”
folders. Each demo should be prefaced
with the hardware platform it is compiled for.
Select the file that matches the hardware that you have and the demo
that you want to run. For more
information about how to load a precompiled project, please see the “Getting
Started – Loading a precompiled demo” guide.
The
source code for this demo is available in the “<Install Directory\USB Device
– Mass Storage – SD Card reader” directory.
In this directory you will find all of the user level source and header
files as well as project and workspace files for each of the hardware
platforms. Find the project (*.mcp) or
workspace (*.mcw) file that corresponds to the
hardware platform you wish to test.
Compile and program the demo code into the hardware platform. For more help on how to compile and program
projects, please refer to the MPLAB® IDE help available through the help menu
of MPLAB (Help->Topics…->MPLAB IDE).
NOTE
WHEN USING THE HID BOOTLOADER (for PIC18F87J50 PIM): The “USB Device - Mass Storage
- SD Card reader” and “USB Device - Mass Storage - SD Card data logger” demos
make use of the SD Card PICtail Daughter Board (Microchip® Direct:
AC164122). This PICtail uses the RB4 I/O
pin for the card detect (CD) signal, and is actively driven by the
PICtail. The active drive overpowers the
pull up resistor on the RB4 pushbutton (on the PIC18F87J50 FS USB Plug-In
Module board). As a result, if the
PIC18F87J50 is programmed with the HID bootloader, and an SD Card is installed
in the socket when the microcontroller comes out of reset, the firmware will
immediately enter the bootloader (irrespective of the RB4 pushbutton
state). To exit the bootloader
firmware, remove the SD Card from the SD Card socket, and tap the MCLR
button. When the SD Card is not plugged
in, the PICtail will drive the card detect signal (which is connected to RB4)
logic high, which will enable the bootloader to exit to the main application
after coming out of reset. Once the main
application firmware is operating, the SD Card can be plugged in. The SD Card is “hot-swappable” and should be
recognized by the host upon insertion.
To avoid this inconvenience when using the bootloader with the PICtail,
it is suggested to modify the bootloader firmware to use some other I/O pin for
bootloader entry, such as RB0 (which has a pushbutton on it on the HPC Explorer
board).
This
demo uses the selected hardware platform as an SD card reader. Connect the hardware platform to a computer
through a USB cable.
The
device should appear as a new drive on the computer named “
If
no SD Card is inserted in the SD Card PICTail Plus, the following dialog will pop-up.
Once
a compatible card is inserted in the card reader, files can be read, deleted,
and manipulated like any other drive on the computer.
The Microchip name and logo, the Microchip logo,
MPLAB, and PIC are registered trademarks of Microchip Technology Incorporated
in the
PICDEM and PICTail are
trademarks of Microchip Technology Incorporated in the
Microsoft, Windows, and
Windows Vista are either registered trademarks or trademarks of Microsoft
Corporation in the
SD is a trademark of the SD Association in the
U.S.A and other countries