Frank Vannieuwkerke / Mbed 2 deprecated LPC1768_Mini-DK

LPC1768 Mini-DK board with 2.8" SPI TFT and SPI touch

Dependencies:   Mini-DK mbed SDFileSystem

WARNING: filetoflash (SD to CPU flash)

The SPI_TFT library called from Mini-DK.lib 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).

modifs.h@3:fb4d62b5ffb3, 2013-01-03 (annotated)

Committer:
frankvnk
Date:
Thu Jan 03 16:16:24 2013 +0000
Revision:
3:fb4d62b5ffb3
Parent:
2:d0acbd263ec7
Child:
5:781a72d380a1
Changes - see modifs.h

Who changed what in which revision?

UserRevisionLine numberNew contents of line
frankvnk 2:d0acbd263ec7 1 /*
frankvnk 3:fb4d62b5ffb3 2 Date : 31.12.12
frankvnk 3:fb4d62b5ffb3 3 Authors : Erik Olieman/Frank Vannieuwkerke
frankvnk 3:fb4d62b5ffb3 4 -----------------------------------------
frankvnk 3:fb4d62b5ffb3 5 Code readability and speed
frankvnk 3:fb4d62b5ffb3 6 1. created separate structure for mini-DK (base for library)
frankvnk 3:fb4d62b5ffb3 7 2. Removed wr_dat_only routine (uses 8 bit transfer = slow) in SPI_TFT
frankvnk 3:fb4d62b5ffb3 8 Replaced each wr_dat_only with
frankvnk 3:fb4d62b5ffb3 9 _spi.format(16,3);
frankvnk 3:fb4d62b5ffb3 10 .....
frankvnk 3:fb4d62b5ffb3 11 _spi.write(...);
frankvnk 3:fb4d62b5ffb3 12 .....
frankvnk 3:fb4d62b5ffb3 13 _spi.format(8,3);
frankvnk 3:fb4d62b5ffb3 14 3. Creation of Mini-DK.h with all declarations specific to the mini-DK board.
frankvnk 2:d0acbd263ec7 15
frankvnk 2:d0acbd263ec7 16
frankvnk 2:d0acbd263ec7 17 Removed reset pin from SPI_TFT (not needed - pin is connected to main reset).
frankvnk 2:d0acbd263ec7 18
frankvnk 2:d0acbd263ec7 19 Separated SPI_TFT from TouchADS7843
frankvnk 2:d0acbd263ec7 20
frankvnk 2:d0acbd263ec7 21 In main.cpp
frankvnk 2:d0acbd263ec7 22 -----------
frankvnk 2:d0acbd263ec7 23
frankvnk 3:fb4d62b5ffb3 24 TouchScreenADS7843 initialisation: pointer to SPI_TFT needed for calibration, drawcross and drawpoint routines.
frankvnk 3:fb4d62b5ffb3 25
frankvnk 3:fb4d62b5ffb3 26 Moved following global touch var declarations from main.cpp back to touch.cpp/.h
frankvnk 2:d0acbd263ec7 27 Matrix matrix;
frankvnk 2:d0acbd263ec7 28 Coordinate display;
frankvnk 2:d0acbd263ec7 29 Coordinate screen;
frankvnk 2:d0acbd263ec7 30 NOTE : i did not create a class with var readback, just used plain C notation.
frankvnk 2:d0acbd263ec7 31 These vars can be accessed from other code through <classname>.<varname>
frankvnk 2:d0acbd263ec7 32 example : TP.display.x
frankvnk 2:d0acbd263ec7 33 Only drawback : Each element of these vars needs to be initialised separately.
frankvnk 2:d0acbd263ec7 34 (initialisation of these vars is not possible with array notation).
frankvnk 2:d0acbd263ec7 35
frankvnk 2:d0acbd263ec7 36 In Touch.cpp/.h
frankvnk 2:d0acbd263ec7 37 ---------------
frankvnk 3:fb4d62b5ffb3 38 TouchScreenADS7843 constructor: added pointer to SPI_TFT - needed for calibration, drawcross and drawpoint routines.
frankvnk 3:fb4d62b5ffb3 39 If LCD calls are not needed, initialise TouchScreenADS7843 with NULL pointer for LCD.
frankvnk 2:d0acbd263ec7 40
frankvnk 3:fb4d62b5ffb3 41 Removed TP_Init - moved TP_init code to constructor.
frankvnk 2:d0acbd263ec7 42
frankvnk 2:d0acbd263ec7 43 Variables in call to TouchPanel_Calibrate, Read_Ads7846, getDisplayPoint are no longer needed.
frankvnk 2:d0acbd263ec7 44 Modified these routines accordingly in touch.cpp/.h (pointers no longer needed)
frankvnk 2:d0acbd263ec7 45 *** TouchPanel_Calibrate and getDisplayPoint already modified.
frankvnk 2:d0acbd263ec7 46
frankvnk 3:fb4d62b5ffb3 47 Read_Ads7846: is also called in TouchPanel_Calibrate (Touch.cpp) with other var.
frankvnk 3:fb4d62b5ffb3 48 Modified Read_Ads7846 to allow call with/without (parameter).
frankvnk 3:fb4d62b5ffb3 49 If called without (parameter) - screen variable is used, otherwise (parameter) is used.
frankvnk 3:fb4d62b5ffb3 50 in Touch.h - unsigned char Read_Ads7846(Coordinate * screenPtr); replaced with
frankvnk 3:fb4d62b5ffb3 51 unsigned char Read_Ads7846(Coordinate * screenPtr = NULL);
frankvnk 3:fb4d62b5ffb3 52 in Touch.cpp - if (screenPtr == NULL) screenPtr = &screen; added.
frankvnk 2:d0acbd263ec7 53
frankvnk 2:d0acbd263ec7 54
frankvnk 2:d0acbd263ec7 55 General notes
frankvnk 2:d0acbd263ec7 56 -------------
frankvnk 3:fb4d62b5ffb3 57 lpc1768 SPI port - problem when using SD and TFT simultaneously - solution provided by Erik Olieman
frankvnk 2:d0acbd263ec7 58 see note http://mbed.org/comments/cr/83/2654/#c4768
frankvnk 3:fb4d62b5ffb3 59 Even faster SPI write : http://mbed.org/users/Sissors/code/BurstSPI/docs/600eecd89a78/BurstSPI_8cpp_source.html
frankvnk 2:d0acbd263ec7 60 */