diff options
Diffstat (limited to 'nuttx/configs/arduino-due/include/board.h')
| -rw-r--r-- | nuttx/configs/arduino-due/include/board.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/nuttx/configs/arduino-due/include/board.h b/nuttx/configs/arduino-due/include/board.h index 43d3fe016..b9059131e 100644 --- a/nuttx/configs/arduino-due/include/board.h +++ b/nuttx/configs/arduino-due/include/board.h @@ -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 ************************************************************************************/ |