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

[Christian Mauderer]

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 6cf463d1ec..1e24b7321c 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 e39825dfa5..d6df587464 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);
+	}
+}
-- 
2.13.6