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Commit d8b20112 authored by Gregory Nutt's avatar Gregory Nutt
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SAM4E-EK: Remove bogus LCD driver; replace with information that might be... 

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
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configs/sam4e-ek/Kconfig
+ 13
− 0
View file @ d8b20112
......@@ -62,4 +62,17 @@ config SAM4EEK_HSMCI_BLOCKDEVICE
endchoice # AT25 serial FLASH configuration
config SAM4EEK_ILI9325
bool "ILI9325-based LCD"
default n
depends on EXPERIMENTAL
select NX
select NX_LCDDRIVER
---help---
This option enables support for the SAM4E-EK on-board LCD. The
SAM4E-EK carries a TFT transmissive LCD module with touch panel,
FTM280C34D. Its integrated driver IC is ILI9325. The LCD display
area is 2.8 inches diagonally measured, with a native resolution
of 240 x 320 dots.
endif # ARCH_BOARD_SAM4EEK
configs/sam4e-ek/README.txt
+ 155
− 43
View file @ d8b20112
......@@ -24,6 +24,7 @@ Contents
- USB Full-Speed Device
- HSMCI
- Touchscreen
- ILI9325-Based LCD
- SAM4E-EK-specific Configuration Options
- Configurations
......@@ -845,49 +846,160 @@ HSMCI
Touchscreen
===========
The NSH configuration can be used to verify the ADS7843E touchscreen on
the SAM4E-EK LCD. With these modifications, you can include the touchscreen
test program at apps/examples/touchscreen as an NSH built-in application.
You can enable the touchscreen and test by modifying the default
configuration in the following ways:
Device Drivers
CONFIG_SPI=y : Enable SPI support
CONFIG_SPI_EXCHANGE=y : The exchange() method is supported
CONFIG_SPI_OWNBUS=y : Smaller code if this is the only SPI device
CONFIG_INPUT=y : Enable support for input devices
CONFIG_INPUT_ADS7843E=y : Enable support for the XPT2046
CONFIG_ADS7843E_SPIDEV=2 : Use SPI CS 2 for communication
CONFIG_ADS7843E_SPIMODE=0 : Use SPI mode 0
CONFIG_ADS7843E_FREQUENCY=1000000 : SPI BAUD 1MHz
CONFIG_ADS7843E_SWAPXY=y : If landscape orientation
CONFIG_ADS7843E_THRESHX=51 : These will probably need to be tuned
CONFIG_ADS7843E_THRESHY=39
System Type -> Peripherals:
CONFIG_SAM34_SPI0=y : Enable support for SPI
System Type:
CONFIG_SAM34_GPIO_IRQ=y : GPIO interrupt support
CONFIG_SAM34_GPIOA_IRQ=y : Enable GPIO interrupts from port A
RTOS Features:
CONFIG_DISABLE_SIGNALS=n : Signals are required
Library Support:
CONFIG_SCHED_WORKQUEUE=y : Work queue support required
Application Configuration:
CONFIG_EXAMPLES_TOUCHSCREEN=y : Enable the touchscreen built-in test
Defaults should be okay for related touchscreen settings. Touchscreen
debug output on UART0 can be enabled with:
Build Setup:
CONFIG_DEBUG=y : Enable debug features
CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output
CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
The NSH configuration can be used to verify the ADS7843E touchscreen on
the SAM4E-EK LCD. With these modifications, you can include the touchscreen
test program at apps/examples/touchscreen as an NSH built-in application.
You can enable the touchscreen and test by modifying the default
configuration in the following ways:
Device Drivers
CONFIG_SPI=y : Enable SPI support
CONFIG_SPI_EXCHANGE=y : The exchange() method is supported
CONFIG_SPI_OWNBUS=y : Smaller code if this is the only SPI device
CONFIG_INPUT=y : Enable support for input devices
CONFIG_INPUT_ADS7843E=y : Enable support for the XPT2046
CONFIG_ADS7843E_SPIDEV=2 : Use SPI CS 2 for communication
CONFIG_ADS7843E_SPIMODE=0 : Use SPI mode 0
CONFIG_ADS7843E_FREQUENCY=1000000 : SPI BAUD 1MHz
CONFIG_ADS7843E_SWAPXY=y : If landscape orientation
CONFIG_ADS7843E_THRESHX=51 : These will probably need to be tuned
CONFIG_ADS7843E_THRESHY=39
System Type -> Peripherals:
CONFIG_SAM34_SPI0=y : Enable support for SPI
System Type:
CONFIG_SAM34_GPIO_IRQ=y : GPIO interrupt support
CONFIG_SAM34_GPIOA_IRQ=y : Enable GPIO interrupts from port A
RTOS Features:
CONFIG_DISABLE_SIGNALS=n : Signals are required
Library Support:
CONFIG_SCHED_WORKQUEUE=y : Work queue support required
Application Configuration:
CONFIG_EXAMPLES_TOUCHSCREEN=y : Enable the touchscreen built-in test
Defaults should be okay for related touchscreen settings. Touchscreen
debug output on UART0 can be enabled with:
Build Setup:
CONFIG_DEBUG=y : Enable debug features
CONFIG_DEBUG_VERBOSE=y : Enable verbose debug output
CONFIG_DEBUG_INPUT=y : Enable debug output from input devices
STATUS
2014-3-27: As of this writing, the touchscreen is untested.
ILI9325-Based LCD
=================
The SAM4E-EK carries a TFT transmissive LCD module with touch panel,
FTM280C34D. Its integrated driver IC is ILI9325. The LCD display area is
2.8 inches diagonally measured, with a native resolution of 240 x 320
dots.
No driver has been developed for the SAM4E-EK LCD as of this writing.
Some technical information follows might be useful to anyone who is
inspired to develop that driver:
Connectivity
------------
The SAM4E16 communicates with the LCD through PIOC where an 8-bit
parallel "8080-like" protocol data bus has to be implemented in
software.
---- ----- --------- --------------------------------
PIN PIO SIGNAL NOTES
---- ----- --------- --------------------------------
1 VDD
2 PC7 DB17
3 PC6 DB16
4 PC5 DB15
5 PC4 DB14
6 PC3 DB13
7 PC2 DB12
8 PC1 DB11
9 PC0 DB10
10 DB9 Pulled low
11 DB8 Pulled low
12 DB7 Pulled low
13 DB6 Pulled low
14 DB5 Pulled low
15 DB4 Pulled low
16 DB3 Pulled low
17 DB2 Pulled low
18 DB1 Pulled low
19 DB0 Pulled low
---- ----- --------- --------------------------------
20 VDD
21 PC11 RD
22 PC8 WR
23 PC19 RS
24 PD18 CS Via J8, pulled high. Connects to NRST.
25 RESET Connects to NSRST
26 IM0 Pulled high
27 IM1 Grounded
28 GND
---- ----- --------- --------------------------------
29 [PC13] LED-A Backlight controls: PC13 enables
30 [PC13] LEDK1 AAT3155 charge pump that drives
31 [PC13] LEDK2 the backlight LEDs
32 [PC13] LEDK3
33 [PC13] LEDK4
34 [PC13] LEDK1
---- ----- --------- --------------------------------
35 Y+ These go to the ADS7843
36 Y- touchscreen controller.
37 X+
38 X-
39 NC
---- ----- --------- --------------------------------
The ILI9325 IM0 and IM1 lines are pulled up and down, respectively.
This puts the ILI9325 in the mode "i80-system 16-bit interface DB[17:10],
DB[8:1]". As you can see above, the LCD DB[17:10] connect to PC[0:7];
I don't understand why DB[8:1] are grounded???
Backlight
---------
LCD backlight is made of 4 white chip LEDs in parallel, driven by an
AAT3155 charge pump, MN4. The AAT3155 is controlled by the SAM3U4E
through a single line Simple Serial Control (S2Cwire) interface, which
permits to enable, disable, and set the LED drive current (LED
brightness control) from a 32-level logarithmic scale. Four resistors
R93/R94/R95/R96 are implemented for optional current limitation.
Resources
---------
If you want to implement LCD support, here are some references that may
help you:
1. Atmel Sample Code (ASF). There is no example for the SAM4E-EK, but
there is for the SAM4S-EK. The LCD and its processor connectivity
appear to be equivalent to the SAM4E-EK so this sample code should be
a good place to begin. NOTE that the clock frequencies may be
different and pin usage may be different. So it may be necessary to
adjust the SAM configuration to use this example.
2. There is an example of an LCD driver for the SAM3U at
configs/sam4u-ek/src/up_lcd.c. That LCD driver is for an LCD with a
different LCD controller but should provide the NuttX SAM framework
for an LCD driver.
3. There are other LCD drivers for different MCUs that do support the
ILI9325 LCD. Look at configs/shenzhou/src/up_ili93xx.c,
configs/stm3220g-eval/src/up_lcd.c, and
configs/stm3240g-eval/src/up_lcd.c. I believe that the Shenzhou
driver is the most recent.
STATUS:
2014-3-27: Not implemented.
SAM4E-EK-specific Configuration Options
=======================================
......
configs/sam4e-ek/src/Makefile
+ 2
− 2
View file @ d8b20112
......@@ -46,8 +46,8 @@ ifeq ($(CONFIG_HAVE_CXXINITIALIZE),y)
CSRCS += sam_cxxinitialize.c
endif
ifeq ($(CONFIG_LCD),y)
CSRCS += sam_lcd.c
ifeq ($(CONFIG_SAM4EEK_ILI9325),y)
CSRCS += sam_ili9325.c
endif
ifeq ($(CONFIG_NSH_ARCHINIT),y)
......
configs/sam4e-ek/src/sam_ili9523.c 0 → 100644
+ 227
− 0
View file @ d8b20112
/**************************************************************************************
* configs/sam4e-ek/src/sam_ili9325.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************************/
/**************************************************************************************
*
* The SAM4E-EK carries a TFT transmissive LCD module with touch panel, FTM280C34D.
* Its integrated driver IC is ILI9325. The LCD display area is 2.8 inches diagonally
* measured, with a native resolution of 240 x 320 dots.
*
* The SAM4E16 communicates with the LCD through PIOC where an 8-bit parallel "8080-
* like" protocol data bus has to be implemented in software.
*
* ---- ----- --------- --------------------------------
* PIN PIO SIGNAL NOTES
* ---- ----- --------- --------------------------------
* 1 VDD
* 2 PC7 DB17
* 3 PC6 DB16
* 4 PC5 DB15
* 5 PC4 DB14
* 6 PC3 DB13
* 7 PC2 DB12
* 8 PC1 DB11
* 9 PC0 DB10
* 10 DB9 Pulled low
* 11 DB8 Pulled low
* 12 DB7 Pulled low
* 13 DB6 Pulled low
* 14 DB5 Pulled low
* 15 DB4 Pulled low
* 16 DB3 Pulled low
* 17 DB2 Pulled low
* 18 DB1 Pulled low
* 19 DB0 Pulled low
* ---- ----- --------- --------------------------------
* 20 VDD
* 21 PC11 RD
* 22 PC8 WR
* 23 PC19 RS
* 24 PD18 CS Via J8, pulled high. Connects to NRST.
* 25 RESET Connects to NSRST
* 26 IM0 Pulled high
* 27 IM1 Grounded
* 28 GND
* ---- ----- --------- --------------------------------
* 29 [PC13] LED-A Backlight controls: PC13 enables
* 30 [PC13] LEDK1 AAT3155 charge pump that drives
* 31 [PC13] LEDK2 the backlight LEDs
* 32 [PC13] LEDK3
* 33 [PC13] LEDK4
* 34 [PC13] LEDK1
* ---- ----- --------- --------------------------------
* 35 Y+ These go to the ADS7843
* 36 Y- touchscreen controller.
* 37 X+
* 38 X-
* 39 NC
* ---- ----- --------- --------------------------------
*
* The ILI9325 IM0 and IM1 lines are pulled up and down, respectively. This puts
* the ILI9325 in the mode "i80-system 16-bit interface DB[17:10], DB[8:1]". As
* you can see above, the LCD DB[17:10] connect to PC[0:7]; I don't understand why
* DB[8:1] are grounded???
*
* LCD backlight is made of 4 white chip LEDs in parallel, driven by an AAT3155
* charge pump, MN4. The AAT3155 is controlled by the SAM3U4E through a single line
* Simple Serial Control (S2Cwire) interface, which permits to enable, disable, and
* set the LED drive current (LED brightness control) from a 32-level logarithmic
* scale. Four resistors R93/R94/R95/R96 are implemented for optional current
* limitation.
*
**************************************************************************************/
/**************************************************************************************
* Included Files
**************************************************************************************/
/**************************************************************************************
* Pre-processor Definitions
**************************************************************************************/
/* Configuration **********************************************************************/
/* Define the following to enable register-level debug output */
#undef CONFIG_LCD_REGDEBUG
/* Verbose debug must also be enabled */
#ifndef CONFIG_DEBUG
# undef CONFIG_DEBUG_VERBOSE
# undef CONFIG_DEBUG_LED
#endif
#ifndef CONFIG_DEBUG_VERBOSE
# undef CONFIG_LCD_REGDEBUG
#endif
/* Debug ******************************************************************************/
#ifdef CONFIG_LCD_REGDEBUG
# define regdbg(format, arg...) vdbg(format, ##arg)
#else
# define regdbg(x...)
#endif
#ifdef CONFIG_DEBUG_LCD
# define lcddbg(format, arg...) dbg(format, ##arg)
# define lcdvdbg(format, arg...) vdbg(format, ##arg)
#else
# define lcddbg(x...)
# define lcdvdbg(x...)
#endif
/**************************************************************************************
* Private Type Definition
**************************************************************************************/
/**************************************************************************************
* Private Function Prototypes
**************************************************************************************/
/**************************************************************************************
* Private Data
**************************************************************************************/
/**************************************************************************************
* Private Functions
**************************************************************************************/
/**************************************************************************************
* Public Functions
**************************************************************************************/
/**************************************************************************************
* Name: up_lcdinitialize
*
* Description:
* Initialize the LCD video hardware. The initial state of the LCD is fully
* initialized, display memory cleared, and the LCD ready to use, but with the power
* setting at 0 (full off).
*
**************************************************************************************/
int up_lcdinitialize(void)
{
/* Not implemented
*
* If you want to implement LCD support, here are some references:
*
* 1. Atmel Sample Code (ASF). There is no example for the SAM4E-EK, but there is for
* the SAM4S-EK. The LCD and its processor connectivity appear to be equivalent
* to the SAM4E-EK so this sample code should be a good place to begin. NOTE that
* the clock frequencies may be different and pin usage may be different. So it
* may be necessary to adjust the SAM configuration to use this example.
* 2. There is an example of an LCD driver for the SAM3U at configs/sam4u-ek/src/up_lcd.c.
* That LCD driver is for an LCD with a different LCD controller but should provide
* the NuttX SAM framework for an LCD driver.
* 3. There are other LCD drivers for different MCUs that do support the ILI9325
* LCD. Look at configs/shenzhou/src/up_ili93xx.c, configs/stm3220g-eval/src/up_lcd.c,
* and configs/stm3240g-eval/src/up_lcd.c. I believe that the Shenzhou driver is
* the most recent.
*/
return -ENOSYS;
}
/**************************************************************************************
* Name: up_lcdgetdev
*
* Description:
* Return a a reference to the LCD object for the specified LCD. This allows
* support for multiple LCD devices.
*
**************************************************************************************/
FAR struct lcd_dev_s *up_lcdgetdev(int lcddev)
{
/* Not implemented */
return NULL;
}
/**************************************************************************************
* Name: up_lcduninitialize
*
* Description:
* Unitialize the framebuffer support.
*
**************************************************************************************/
void up_lcduninitialize(void)
{
/* Not implemented */
}
configs/sam4e-ek/src/sam_lcd.c deleted 100644 → 0
+ 0
− 1072
View file @ a37c1586
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