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pinio.h: support pulldown resistors. 

These are ARM only, because ATmegas have no such feature.
This commit is contained in:
Markus Hitter 2016-06-25 21:30:18 +02:00
parent 35191306d7
commit aed6f5a14b
1 changed files with 11 additions and 2 deletions
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13
pinio.h
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@ -51,6 +51,8 @@
/// Enable pullup resistor. /// Enable pullup resistor.
#define _PULLUP_ON(IO) _WRITE(IO, 1) #define _PULLUP_ON(IO) _WRITE(IO, 1)
/// No such feature on ATmegas.
#define _PULLDOWN_ON(IO) atmegas_dont_support_pulldown_resistors()
/// Disable pullup resistor. /// Disable pullup resistor.
#define _PULL_OFF(IO) _WRITE(IO, 0) #define _PULL_OFF(IO) _WRITE(IO, 0)
@ -89,11 +91,16 @@
IO ## _PORT->DIR |= MASK(IO ## _PIN); \ IO ## _PORT->DIR |= MASK(IO ## _PIN); \
} while (0) } while (0)
/// Enable pullup resistor. /// Enable pullup resistor or switch from pulldown to pullup.
#define _PULLUP_ON(IO) \ #define _PULLUP_ON(IO) \
do { \ do { \
LPC_IOCON->IO ## _CMSIS = (IO ## _OUTPUT | IO_MODEMASK_PULLUP); \ LPC_IOCON->IO ## _CMSIS = (IO ## _OUTPUT | IO_MODEMASK_PULLUP); \
} while (0) } while (0)
/// Enable pulldown resistor or switch from pullup to pulldown.
#define _PULLDOWN_ON(IO) \
do { \
LPC_IOCON->IO ## _CMSIS = (IO ## _OUTPUT | IO_MODEMASK_PULLDOWN); \
} while (0)
/// Disable pull resistor. /// Disable pull resistor.
#define _PULL_OFF(IO) \ #define _PULL_OFF(IO) \
do { \ do { \
@ -127,8 +134,10 @@
/// Set pin as output wrapper. /// Set pin as output wrapper.
#define SET_OUTPUT(IO) _SET_OUTPUT(IO) #define SET_OUTPUT(IO) _SET_OUTPUT(IO)
/// Enable pullup resistor. /// Enable pullup resistor or switch from pulldown to pullup.
#define PULLUP_ON(IO) _PULLUP_ON(IO) #define PULLUP_ON(IO) _PULLUP_ON(IO)
/// Enable pulldown resistor or switch from pullup to pulldown.
#define PULLDOWN_ON(IO) _PULLDOWN_ON(IO)
/// Disable pull resistor. /// Disable pull resistor.
#define PULL_OFF(IO) _PULL_OFF(IO) #define PULL_OFF(IO) _PULL_OFF(IO)