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Add option to enable Aduino Due specific logic, like pull-up on UART0 RXD. Suggested by gdi@embedders.org

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This commit is contained in:
Gregory Nutt 2013-10-09 07:35:00 -06:00
parent 0b9b77067e
commit 3b6e63199a
4 changed files with 51 additions and 0 deletions
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5
ChangeLog
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@ -5726,4 +5726,9 @@
incorporated into the build system (but still untested (2013-10-8).
* configs/sama5d3x-ek/nx: Add an examples/nx configuratino that
will be used for the SAMA5 LCD bring-up (2013-10-8).
* configs/arduino-due/Kconfig and include/board.h: Add configuration
to select revision 3 of the Arduino Due which has some small
but important differences. Suggested by gdi@embedders.org.
D
differences

8
configs/arduino-due/Kconfig
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@ -5,6 +5,14 @@
if ARCH_BOARD_ARDUINO_DUE
config ADRUINO_DUE_REV3
bool "Rev 3"
default n
---help---
This port was performed on the Aduino Due Rev 2 board. Differences
with the Arduino Due Rev 3 board have been reported. This selection
will enable work arounds specifically for the Rev 3 board.
config ARDUINO_ITHEAD_TFT
bool "ITEAD 2.4 inch TFT w/Touch"
default n

12
configs/arduino-due/README.txt
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@ -13,6 +13,7 @@ Contents
^^^^^^^^
- PIO Pin Usage
- Rev 2 vs. Rev 3
- ITEAD 2.4" TFT with Touch
- Development Environment
- GNU Toolchain Options
@ -105,6 +106,17 @@ PIO Pin Usage
PD31 N/A5 N/A PE31 N/A N/A PF31 N/A N/A
----- ---------- ---- -------- ----- ------------ ---- ------ ----- ----------- ---- ---------
Rev 2 vs. Rev 3
^^^^^^^^^^^^^^^
This port was performed on the Arduino Due Rev 2 board. NuttX users
have reported issues with the serial port on his Aduino Due Rev 3 board.
That problem was resolved as by configuring the UART0 RXD with a pull-up
(see include/board.h). That fix as well as any others that we may find
will be enabled by selecting
CONFIG_ADRUINO_DUE_REV3=y
ITEAD 2.4" TFT with Touch
^^^^^^^^^^^^^^^^^^^^^^^^^

26
configs/arduino-due/include/board.h
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@ -195,6 +195,32 @@
/* Button definitions ***************************************************************/
/* There are no buttons on the Arduino Due board. */
/* GPIO pin configurations **********************************************************/
#ifdef CONFIG_ADRUINO_DUE_REV3
/* This port was performed on the Arduino Due Rev 2 board. A NuttX user reported
* issues with the serial port on his Aduino Due Rev 3 board. That problem was
* resolved as follows:
*
* "... The issue was in my hardware. I found the difference between Arduino
* Due shematics (revision R2) and actual PCB layout of my Arduino (revision
* R3). On a schematics which I download from arduino.cc was shown that 2nd
* pin of IC10 is connected to the ground, but on my Arduino the 2nd pin
* of IC10 was connected to its 1st pin instead of ground and in my case
* IC10 works in open-drain mode, but RX0 pin on SAM3x doesn't have pull-up
* and thus TX signal from AtMega16U2 can't reach the SAM3x input pin, on
* this pin always '0'.
*
* "My solution is to enable internal pull-up in SAM3x. ...
* Now shell console on UART0 (via USB programming connector) of Arduino Due
* Due works as expected."
*/
# undef GPIO_UART0_RXD
# define GPIO_UART0_RXD (GPIO_PERIPHA | GPIO_CFG_DEFAULT | GPIO_PORT_PIOA | \
GPIO_PIN8 | GPIO_CFG_PULLUP)
#endif
/************************************************************************************
* Public Data
************************************************************************************/