SAM4E-EK: Remove bogus LCD driver; replace with information that might be useful to someone who wants to develop an LCD driver for the SAM4E-EK
This commit is contained in:
Gregory Nutt
parent
a37c158659
commit
d8b2011218
@ -62,4 +62,17 @@ config SAM4EEK_HSMCI_BLOCKDEVICE
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endchoice # AT25 serial FLASH configuration
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endchoice # AT25 serial FLASH configuration
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config SAM4EEK_ILI9325
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bool "ILI9325-based LCD"
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default n
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depends on EXPERIMENTAL
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select NX
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select NX_LCDDRIVER
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---help---
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This option enables support for the SAM4E-EK on-board LCD. The
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SAM4E-EK carries a TFT transmissive LCD module with touch panel,
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FTM280C34D. Its integrated driver IC is ILI9325. The LCD display
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area is 2.8 inches diagonally measured, with a native resolution
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of 240 x 320 dots.
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endif # ARCH_BOARD_SAM4EEK
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endif # ARCH_BOARD_SAM4EEK
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@ -24,6 +24,7 @@ Contents
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- USB Full-Speed Device
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- USB Full-Speed Device
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- HSMCI
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- HSMCI
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- Touchscreen
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- Touchscreen
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- ILI9325-Based LCD
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- SAM4E-EK-specific Configuration Options
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- SAM4E-EK-specific Configuration Options
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- Configurations
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- Configurations
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@ -889,6 +890,117 @@ Touchscreen
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CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output
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CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output
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CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
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CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
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STATUS
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2014-3-27: As of this writing, the touchscreen is untested.
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ILI9325-Based LCD
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=================
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The SAM4E-EK carries a TFT transmissive LCD module with touch panel,
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FTM280C34D. Its integrated driver IC is ILI9325. The LCD display area is
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2.8 inches diagonally measured, with a native resolution of 240 x 320
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dots.
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No driver has been developed for the SAM4E-EK LCD as of this writing.
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Some technical information follows might be useful to anyone who is
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inspired to develop that driver:
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Connectivity
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------------
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The SAM4E16 communicates with the LCD through PIOC where an 8-bit
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parallel "8080-like" protocol data bus has to be implemented in
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software.
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---- ----- --------- --------------------------------
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PIN PIO SIGNAL NOTES
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---- ----- --------- --------------------------------
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1 VDD
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2 PC7 DB17
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3 PC6 DB16
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4 PC5 DB15
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5 PC4 DB14
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6 PC3 DB13
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7 PC2 DB12
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8 PC1 DB11
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9 PC0 DB10
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10 DB9 Pulled low
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11 DB8 Pulled low
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12 DB7 Pulled low
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13 DB6 Pulled low
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14 DB5 Pulled low
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15 DB4 Pulled low
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16 DB3 Pulled low
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17 DB2 Pulled low
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18 DB1 Pulled low
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19 DB0 Pulled low
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---- ----- --------- --------------------------------
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20 VDD
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21 PC11 RD
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22 PC8 WR
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23 PC19 RS
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24 PD18 CS Via J8, pulled high. Connects to NRST.
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25 RESET Connects to NSRST
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26 IM0 Pulled high
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27 IM1 Grounded
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28 GND
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---- ----- --------- --------------------------------
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29 [PC13] LED-A Backlight controls: PC13 enables
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30 [PC13] LEDK1 AAT3155 charge pump that drives
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31 [PC13] LEDK2 the backlight LEDs
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32 [PC13] LEDK3
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33 [PC13] LEDK4
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34 [PC13] LEDK1
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---- ----- --------- --------------------------------
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35 Y+ These go to the ADS7843
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36 Y- touchscreen controller.
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37 X+
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38 X-
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39 NC
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---- ----- --------- --------------------------------
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The ILI9325 IM0 and IM1 lines are pulled up and down, respectively.
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This puts the ILI9325 in the mode "i80-system 16-bit interface DB[17:10],
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DB[8:1]". As you can see above, the LCD DB[17:10] connect to PC[0:7];
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I don't understand why DB[8:1] are grounded???
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Backlight
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---------
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LCD backlight is made of 4 white chip LEDs in parallel, driven by an
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AAT3155 charge pump, MN4. The AAT3155 is controlled by the SAM3U4E
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through a single line Simple Serial Control (S2Cwire) interface, which
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permits to enable, disable, and set the LED drive current (LED
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brightness control) from a 32-level logarithmic scale. Four resistors
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R93/R94/R95/R96 are implemented for optional current limitation.
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Resources
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---------
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If you want to implement LCD support, here are some references that may
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help you:
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1. Atmel Sample Code (ASF). There is no example for the SAM4E-EK, but
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there is for the SAM4S-EK. The LCD and its processor connectivity
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appear to be equivalent to the SAM4E-EK so this sample code should be
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a good place to begin. NOTE that the clock frequencies may be
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different and pin usage may be different. So it may be necessary to
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adjust the SAM configuration to use this example.
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2. There is an example of an LCD driver for the SAM3U at
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configs/sam4u-ek/src/up_lcd.c. That LCD driver is for an LCD with a
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different LCD controller but should provide the NuttX SAM framework
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for an LCD driver.
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3. There are other LCD drivers for different MCUs that do support the
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ILI9325 LCD. Look at configs/shenzhou/src/up_ili93xx.c,
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configs/stm3220g-eval/src/up_lcd.c, and
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configs/stm3240g-eval/src/up_lcd.c. I believe that the Shenzhou
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driver is the most recent.
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STATUS:
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2014-3-27: Not implemented.
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SAM4E-EK-specific Configuration Options
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SAM4E-EK-specific Configuration Options
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=======================================
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=======================================
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@ -46,8 +46,8 @@ ifeq ($(CONFIG_HAVE_CXXINITIALIZE),y)
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CSRCS += sam_cxxinitialize.c
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CSRCS += sam_cxxinitialize.c
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endif
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endif
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ifeq ($(CONFIG_LCD),y)
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ifeq ($(CONFIG_SAM4EEK_ILI9325),y)
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CSRCS += sam_lcd.c
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CSRCS += sam_ili9325.c
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endif
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endif
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ifeq ($(CONFIG_NSH_ARCHINIT),y)
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ifeq ($(CONFIG_NSH_ARCHINIT),y)
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227
configs/sam4e-ek/src/sam_ili9523.c
Normal file
227
configs/sam4e-ek/src/sam_ili9523.c
Normal file
@ -0,0 +1,227 @@
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/**************************************************************************************
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* configs/sam4e-ek/src/sam_ili9325.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************/
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/**************************************************************************************
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*
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* The SAM4E-EK carries a TFT transmissive LCD module with touch panel, FTM280C34D.
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* Its integrated driver IC is ILI9325. The LCD display area is 2.8 inches diagonally
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* measured, with a native resolution of 240 x 320 dots.
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*
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* The SAM4E16 communicates with the LCD through PIOC where an 8-bit parallel "8080-
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* like" protocol data bus has to be implemented in software.
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*
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* ---- ----- --------- --------------------------------
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* PIN PIO SIGNAL NOTES
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* ---- ----- --------- --------------------------------
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* 1 VDD
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* 2 PC7 DB17
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* 3 PC6 DB16
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* 4 PC5 DB15
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* 5 PC4 DB14
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* 6 PC3 DB13
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* 7 PC2 DB12
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* 8 PC1 DB11
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* 9 PC0 DB10
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* 10 DB9 Pulled low
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* 11 DB8 Pulled low
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* 12 DB7 Pulled low
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* 13 DB6 Pulled low
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* 14 DB5 Pulled low
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* 15 DB4 Pulled low
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* 16 DB3 Pulled low
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* 17 DB2 Pulled low
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* 18 DB1 Pulled low
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* 19 DB0 Pulled low
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* ---- ----- --------- --------------------------------
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* 20 VDD
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* 21 PC11 RD
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* 22 PC8 WR
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* 23 PC19 RS
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* 24 PD18 CS Via J8, pulled high. Connects to NRST.
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* 25 RESET Connects to NSRST
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* 26 IM0 Pulled high
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* 27 IM1 Grounded
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* 28 GND
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* ---- ----- --------- --------------------------------
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* 29 [PC13] LED-A Backlight controls: PC13 enables
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* 30 [PC13] LEDK1 AAT3155 charge pump that drives
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* 31 [PC13] LEDK2 the backlight LEDs
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* 32 [PC13] LEDK3
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* 33 [PC13] LEDK4
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* 34 [PC13] LEDK1
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* ---- ----- --------- --------------------------------
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* 35 Y+ These go to the ADS7843
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* 36 Y- touchscreen controller.
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* 37 X+
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* 38 X-
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* 39 NC
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* ---- ----- --------- --------------------------------
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*
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* The ILI9325 IM0 and IM1 lines are pulled up and down, respectively. This puts
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* the ILI9325 in the mode "i80-system 16-bit interface DB[17:10], DB[8:1]". As
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* you can see above, the LCD DB[17:10] connect to PC[0:7]; I don't understand why
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* DB[8:1] are grounded???
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*
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* LCD backlight is made of 4 white chip LEDs in parallel, driven by an AAT3155
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* charge pump, MN4. The AAT3155 is controlled by the SAM3U4E through a single line
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* Simple Serial Control (S2Cwire) interface, which permits to enable, disable, and
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* set the LED drive current (LED brightness control) from a 32-level logarithmic
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* scale. Four resistors R93/R94/R95/R96 are implemented for optional current
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* limitation.
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*
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**************************************************************************************/
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/**************************************************************************************
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* Included Files
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**************************************************************************************/
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/**************************************************************************************
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* Pre-processor Definitions
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**************************************************************************************/
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/* Configuration **********************************************************************/
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/* Define the following to enable register-level debug output */
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#undef CONFIG_LCD_REGDEBUG
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/* Verbose debug must also be enabled */
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#ifndef CONFIG_DEBUG
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# undef CONFIG_DEBUG_VERBOSE
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# undef CONFIG_DEBUG_LED
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#endif
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#ifndef CONFIG_DEBUG_VERBOSE
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# undef CONFIG_LCD_REGDEBUG
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#endif
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/* Debug ******************************************************************************/
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#ifdef CONFIG_LCD_REGDEBUG
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# define regdbg(format, arg...) vdbg(format, ##arg)
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#else
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# define regdbg(x...)
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#endif
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#ifdef CONFIG_DEBUG_LCD
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# define lcddbg(format, arg...) dbg(format, ##arg)
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# define lcdvdbg(format, arg...) vdbg(format, ##arg)
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#else
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# define lcddbg(x...)
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# define lcdvdbg(x...)
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#endif
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/**************************************************************************************
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* Private Type Definition
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**************************************************************************************/
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/**************************************************************************************
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* Private Function Prototypes
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**************************************************************************************/
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/**************************************************************************************
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* Private Data
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**************************************************************************************/
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/**************************************************************************************
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* Private Functions
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**************************************************************************************/
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/**************************************************************************************
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* Public Functions
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**************************************************************************************/
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/**************************************************************************************
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* Name: up_lcdinitialize
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*
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* Description:
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* Initialize the LCD video hardware. The initial state of the LCD is fully
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* initialized, display memory cleared, and the LCD ready to use, but with the power
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* setting at 0 (full off).
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*
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**************************************************************************************/
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int up_lcdinitialize(void)
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{
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/* Not implemented
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*
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* If you want to implement LCD support, here are some references:
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*
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* 1. Atmel Sample Code (ASF). There is no example for the SAM4E-EK, but there is for
|
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* the SAM4S-EK. The LCD and its processor connectivity appear to be equivalent
|
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* to the SAM4E-EK so this sample code should be a good place to begin. NOTE that
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* the clock frequencies may be different and pin usage may be different. So it
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* may be necessary to adjust the SAM configuration to use this example.
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* 2. There is an example of an LCD driver for the SAM3U at configs/sam4u-ek/src/up_lcd.c.
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* That LCD driver is for an LCD with a different LCD controller but should provide
|
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* the NuttX SAM framework for an LCD driver.
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* 3. There are other LCD drivers for different MCUs that do support the ILI9325
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* LCD. Look at configs/shenzhou/src/up_ili93xx.c, configs/stm3220g-eval/src/up_lcd.c,
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* and configs/stm3240g-eval/src/up_lcd.c. I believe that the Shenzhou driver is
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* the most recent.
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*/
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return -ENOSYS;
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}
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/**************************************************************************************
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* Name: up_lcdgetdev
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*
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* Description:
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* Return a a reference to the LCD object for the specified LCD. This allows
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* support for multiple LCD devices.
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*
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**************************************************************************************/
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FAR struct lcd_dev_s *up_lcdgetdev(int lcddev)
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{
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/* Not implemented */
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return NULL;
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}
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/**************************************************************************************
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* Name: up_lcduninitialize
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*
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* Description:
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* Unitialize the framebuffer support.
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*
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**************************************************************************************/
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void up_lcduninitialize(void)
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{
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/* Not implemented */
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}
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