[rtems commit] bsp/atsam: Allow setting the drive strength.

[Christian Mauderer]

Module:    rtems
Branch:    master
Commit:    71c5552f9a7c2fbe27b860fafc295427955f25a1
Changeset: http://git.rtems.org/rtems/commit/?id=71c5552f9a7c2fbe27b860fafc295427955f25a1

Author:    Christian Mauderer <christian.mauderer at embedded-brains.de>
Date:      Mon Mar 12 16:43:28 2018 +0100

bsp/atsam: Allow setting the drive strength.

This adds a simple function for setting the PIO drive strength.

---

 bsps/arm/atsam/include/libchip/include/pio.h             |  2 ++
 .../lib/libbsp/arm/atsam/libraries/libchip/source/pio.c  | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/bsps/arm/atsam/include/libchip/include/pio.h b/bsps/arm/atsam/include/libchip/include/pio.h
index 6cf463d..1e24b73 100644
--- a/bsps/arm/atsam/include/libchip/include/pio.h
+++ b/bsps/arm/atsam/include/libchip/include/pio.h
@@ -209,6 +209,8 @@ extern void PIO_DisableWriteProtect(const Pin *pin);
 extern void PIO_SetPinType(Pin *pin, uint8_t pinType);
 
 extern uint32_t PIO_GetWriteProtectViolationInfo(const Pin *pin);
+
+extern void PIO_SetDriveStrength(const Pin *pin, uint8_t strength);
 #ifdef __cplusplus
 }
 #endif
diff --git a/c/src/lib/libbsp/arm/atsam/libraries/libchip/source/pio.c b/c/src/lib/libbsp/arm/atsam/libraries/libchip/source/pio.c
index e39825d..d6df587 100644
--- a/c/src/lib/libbsp/arm/atsam/libraries/libchip/source/pio.c
+++ b/c/src/lib/libbsp/arm/atsam/libraries/libchip/source/pio.c
@@ -481,3 +481,19 @@ void PIO_SetPinType(Pin *pin, uint8_t pinType)
 	pin->type = pinType;
 }
 
+/**
+ * \brief Set the drive strength of the pin.
+ *
+ * \param pin  Pointer to a Pin instance describing one or more pins.
+ * \param strength  0 for low drive strength or 1 for high drive strength.
+ */
+void PIO_SetDriveStrength(const Pin *pin, uint8_t strength)
+{
+	Pio *pio = pin->pio;
+
+	if (strength) {
+		pio->PIO_DRIVER |= pin->mask;
+	} else {
+		pio->PIO_DRIVER &= ~(pin->mask);
+	}
+}