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Diffstat (limited to 'nuttx/configs/sam4e-ek/README.txt')
| -rw-r--r-- | nuttx/configs/sam4e-ek/README.txt | 198 |
1 files changed, 155 insertions, 43 deletions
diff --git a/nuttx/configs/sam4e-ek/README.txt b/nuttx/configs/sam4e-ek/README.txt index fc1086aa2..3f00a47de 100644 --- a/nuttx/configs/sam4e-ek/README.txt +++ b/nuttx/configs/sam4e-ek/README.txt @@ -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 ======================================= |