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minimize SD card reads when using SDCARD_SORT_ALPHA (Re-ARM board)

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Because of the Re-ARM card's pinout there is only one SPI connected to
the RepRap Discount Full Graphic LCD display.  The LCD responds to ANY
SCK transitions no matter if it's enable is inactive.  The result is
garbage (usually bars) on the LCD display whenever there is SD card
activity.

This code minimizes this by only accessing the SD card when changing
directory levels if :
SDCARD_SORT_ALPHA is enabled
SDSORT_USES_RAM is true
SDSORT_CACHE_NAMES is true

The code changes result in file names being pulled from the ALPHA SORT
memory array rather than the SD card.

The code also gives the file count and file index functions their own
variables.  When they shared a common variable the index function
sometimes resulted in the file count being short by 1.

=======================================================================

cardreader.cpp & pins_RAMPS_RE_ARM.h changes

Added another condition to cardreader.cpp to enable getting file names
only from RAM.

pins_RAMPS_RE_ARM.h :
Added comments about the SD card accesses and the LCD display
Combined all versions into this one.
This commit is contained in:
Bob-the-Kuhn
2017-07-30 00:02:41 -05:00
committed by Scott Lahteine
parent 84a11cfedc
commit 76da81c1de
4 changed files with 46 additions and 32 deletions
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16
Marlin/pins_RAMPS_RE_ARM.h
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@ -52,7 +52,7 @@
//
// Servos
//
#define SERVO0_PIN 11
#define SERVO0_PIN 11
#define SERVO1_PIN 6 // also on J5-1
#define SERVO2_PIN 5
#define SERVO3_PIN 4 // 5V output - PWM capable
@ -214,9 +214,9 @@
*
* All controllers can use J3 and J5 on the Re-ARM board. Custom cabling will be required.
*/
/**
* Smart LCD adapter
/**
* Smart LCD adapter
*
* The Smart LCD adapter can be used for the two 10 pin LCD controllers such as
* REPRAP_DISCOUNT_SMART_CONTROLLER. It can't be used for controllers that use
@ -224,7 +224,7 @@
* is needed to pick up 5V for the EXP1 connection.
*
* SD card on the LCD uses the same SPI signals as the LCD. This results in garbage/lines
* on the LCD display during accesses of the SD card. The menus/code has been arranged so
* on the LCD display during accesses of the SD card. The menus/code has been arranged so
* that the garbage/lines are erased immediately after the SD card accesses are completed.
*/
@ -248,7 +248,7 @@
#if ENABLED(REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER) && ENABLED(SDSUPPORT)
#define SDCARD_SORT_ALPHA // Using SORT feature to keep one directory level in RAM
// When going up/down directory levels the SD card is
// accessed but the garbage/lines are removed when the
// accessed but the garbage/lines are removed when the
// LCD updates
// SD Card Sorting options
@ -262,7 +262,7 @@
#define SDSORT_DYNAMIC_RAM false // Use dynamic allocation (within SD menus). Least expensive option. Set SDSORT_LIMIT before use!
#endif
#endif
#define BTN_EN1 31 // J3-2 & AUX-4
#define BTN_EN2 33 // J3-4 & AUX-4
#define BTN_ENC 35 // J3-3 & AUX-4
@ -286,7 +286,7 @@
//#define MOSI 51 // system defined J3-10 & AUX-3
//#define SCK 52 // system defined J3-9 & AUX-3
//#define SS_PIN 53 // system defined J3-5 & AUX-3 - sometimes called SDSS
#if ENABLED(VIKI2) || ENABLED(miniVIKI)
#define LCD_SCREEN_ROT_180