Frank Vannieuwkerke
Library for Mini-DK board
Dependents: LPC1768_Mini-DK_EasyWeb_DM9161 LPC1768_Mini-DK LPC1768_Mini-DK
Fork of
Mini-DK
by 
Frank Vannieuwkerke
Mini-DK board overview (Micro SD connector is at the bottom side)
One serial interface , uses CP2102 (USB to RS232 interface, support ISP download )
RJ45-10/100M Ethernet network interface (Ethernet PHY: DM9161)
2.8 inch TFT color LCD interface (SPI interface or 16Bit parallel interface)
Touch panel controller XPT2046 (ADS7843 compatible)
USB 2.0 interface, USB host and USB Device interface.
TF SD / MMC card (SPI) interface.
Two user buttons, One Reset button and ISP button , One INT0 button, two user-programmable LED lights
Serial ISP download, Standard 20-pin JTAG download simulation debugging interface.
Selection between external 5V power supply or USB 5V supply.
Board size: 95mm * 78mm
All IO available on extension connectors
04/01/13
Erik Olieman (http://mbed.org/users/Sissors/) joined the code development for the Mini-DK board.
Thanks to his input, we were able to obtain a tremendous speed gain, remove warnings, ...
An overview of all modifications is stored in modifs.h
The old page (http://mbed.org/users/frankvnk/code/LPC1768_Mini-DK/) contains the demo code.
IMPORTANT : Due to a change in the mbed libraries (Stream()), we cannot use the printf instruction - we need to use <SPI_TFT>.printf (example - see main.cpp in http://mbed.org/users/frankvnk/code/LPC1768_Mini-DK/)
WARNING: filetoflash (SD to CPU flash)
The SPI_TFT library contains an option to copy an image from the SD card to the CPU flash memory. This allows you to use an image as background without speed loss when writing other text and graphics.
By default, this option is enabled.
It can be disabled by uncommenting the #define mentioned below in Mini_DK.h:
#define NO_FLASH_BUFFER
Since the flash memory has limited write endurance, DO NOT use this feature when you intend to read multiple images from the SD card (eg: when used as a photo frame).
14/01/13
A newer version of the Mini-DK has been released by the manufacturer: Mini-DK2. They replaced the DM9161 PHY with a LAN8720A PHY and better buttons are fitted on the board. All other hardware remains the same. Code for this PHY is available from the NXP MCU SW application team. This allows us to use the mbed 'EthernetInterface' library with little modifications. Further info - see http://mbed.org/forum/mbed/topic/3684/?page=1#comment-18473.
Notes:
The code in 'lpc_phy_lan8720.c' uses 'msDelay' - needs to be replaced with 'osDelay'.
A custom MAC address can be defined using following code:
extern "C" void mbed_mac_address(char * mac) {
// define your own MAC Address
mac[0] = 0x00;
mac[1] = 0x01;
mac[2] = 0x02;
mac[3] = 0x03;
mac[4] = 0x04;
mac[5] = 0x05;
};
modifs.h
- Committer:
- frankvnk
- Date:
- 2013-01-09
- Revision:
- 17:66c4e84d8571
- Parent:
- 6:b547fb6c1095
File content as of revision 17:66c4e84d8571:
/*
Authors : Erik Olieman/Frank Vannieuwkerke
------------------------------------------
11/12/2012 Initial code (ported from Peter Drescher's code - http://mbed.org/cookbook/SPI-driven-QVGA-TFT
Replaced DMA code with SPI code - modified several functions to fit ILI9320.
12/12/2012 (SPI_TFT) Replaced circle and fillcircle with draw_ellipse and fill_ellipse
Modified rect and fillrect: use width and height parameters instead of x1,y1
31/12/2012 lpc1768 SPI port: problem when using SD and TFT simultaneously - solution provided by Erik Olieman
see note http://mbed.org/comments/cr/83/2654/#c4768
Code readability and speed
1. created separate structure for mini-DK (base for library)
2. Removed wr_dat_only routine (uses 8 bit transfer = slow) in SPI_TFT
Replaced each wr_dat_only with
_spi.format(16,3);
.....
_spi.write(...);
.....
_spi.format(8,3);
3. Creation of Mini-DK.h with all declarations specific to the mini-DK board.
Removed reset pin from SPI_TFT (not needed - pin is connected to main reset).
Separated SPI_TFT from TouchADS7843
In main.cpp
-----------
TouchScreenADS7843 initialisation: pointer to SPI_TFT needed for calibration, drawcross and drawpoint routines.
Moved following global touch var declarations from main.cpp back to touch.cpp/.h
Matrix matrix;
Coordinate display;
Coordinate screen;
NOTE : i did not create a class with var readback, just used plain C notation.
These vars can be accessed from other code through <classname>.<varname>
example : TP.display.x
Only drawback : Each element of these vars needs to be initialised separately.
(initialisation of these vars is not possible with array notation).
In Touch.cpp/.h
---------------
TouchScreenADS7843 constructor: added pointer to SPI_TFT - needed for calibration, drawcross and drawpoint routines.
If LCD calls are not needed, initialise TouchScreenADS7843 with NULL pointer for LCD.
Removed TP_Init - moved TP_init code to constructor.
Variables in call to TouchPanel_Calibrate, Read_Ads7846, getDisplayPoint are no longer needed.
Modified these routines accordingly in touch.cpp/.h (pointers no longer needed)
Read_Ads7846: is also called in TouchPanel_Calibrate (Touch.cpp) with other var.
Modified Read_Ads7846 to allow call with/without (parameter).
When called without (parameter) - screen variable is used, otherwise (parameter) is used.
in Touch.h - unsigned char Read_Ads7846(Coordinate * screenPtr); replaced with
unsigned char Read_Ads7846(Coordinate * screenPtr = NULL);
in Touch.cpp - if (screenPtr == NULL) screenPtr = &screen; added.
In SPI_TFT
----------
Changed the SPI object to a BurstSPI object
All cases where large numbers of bytes are written (filled rect, cls, etc) have been replaced by fastWrite functions for higher speed
mbed library updated to this century
Colorwheel stepsize reduced to 1 in main.cpp
Known issues: claim function for stdout does not work
Removed stream name from TextDisplay (not used in current mbed version)
03/01/2013 General cleaning:
SPI_TFT::window function changed to use ints instead of unsigned ints, and made virtual to remove warnings.
In SPI_TFT.cpp GraphicsDiplay initialization moved to front to remove warnings
In Touch.cpp TFT pointer initialization moved to front to remove warnings
In Mini_DK.h Added SD card pins
Added two macros to enable/disable the LCD MISO pin, allowing use of both SD card and LCD
Usage (in your main function):
ENABLE_LCD_MISO when you want to read from LCD
DISABLE_LCD_MISO when you want to read from SD
Faster SPI write: BurstSPI libary added.
_spi.write replaced with _spi.fastWrite
(http://mbed.org/users/Sissors/code/BurstSPI/docs/600eecd89a78/BurstSPI_8cpp_source.html)
Code cleanup & comments added.
Separate Mini_DK library created.
04/01/2013 Added ability to use bitmaps from any filesystem.
Added conversion to be able to use 24 bit bitmaps.
NOTE : Don't forget to load the official mbed SDFileSystem library!!
06/01/2013 Bug fix in Bitmap function: orientation.
Added IAP (In-Application programming): internal Flash memory access library.
Added option to use a background image: #define USE_FLASH_BUFFER introduced in SPI_TFT.h
When omitted, the bitmap is NOT copied to flash memory.
Bitmap function: comments about return codes updated.
Background image remains static when orientation is changed.
Constructor modified in SPI_TFT: backgroundOrientation = 0;
changed to
#ifdef USE_FLASH_BUFFER
backgroundOrientation = 0;
#endif
08/01/2013 Stream & claim issues resolved: mbed library has been updated by the mbed team to allow
stream name => claim function can be used again.
Changed 'TextDisplay::TextDisplay(const char *name) : Stream()' back to
TextDisplay::TextDisplay(const char *name) : Stream(name) in TextDisplay.cpp
#define USE_FLASH_BUFFER (SPI_TFT.h) replaced with #define NO_FLASH_BUFFER (Mini_DK.h). When copy to flash
is not needed, enable this option.
09/01/2013 Code cleanup: modifs.h streamlined.
SPI_TFT.cpp and SPI_TFT.h comments.
Touch.cpp commnets.
*/
