nrf52832: add interface to control GPIO pins

1 files changed, 120 insertions, 0 deletions

diff --git a/src/gpio.h b/src/gpio.h
new file mode 100644
index 0000000..28c0c20
--- /dev/null
+++ b/src/gpio.h
@@ -0,0 +1,120 @@
+#ifndef GPIO_H
+#define GPIO_H
+
+#include "types.h"
+
+/**
+ * The signal level of a GPIO line.
+ */
+enum gpio_level {
+	LOW = 0,
+	HIGH = 1,
+};
+
+/**
+ * The availables GPIO pins on the NRF82832.
+ */
+enum gpio_pin {
+	PIN_0 = 0,
+	PIN_1 = 1,
+	PIN_2 = 2,
+	PIN_3 = 3,
+	PIN_4 = 4,
+	PIN_5 = 5,
+	PIN_6 = 6,
+	PIN_7 = 7,
+	PIN_8 = 8,
+	PIN_9 = 9,
+	PIN_10 = 10,
+	PIN_11 = 11,
+	PIN_12 = 12,
+	PIN_13 = 13,
+	PIN_14 = 14,
+	PIN_15 = 15,
+	PIN_16 = 16,
+	PIN_17 = 17,
+	PIN_18 = 18,
+	PIN_19 = 19,
+	PIN_20 = 20,
+	PIN_21 = 21,
+	PIN_22 = 22,
+	PIN_23 = 23,
+	PIN_24 = 24,
+	PIN_25 = 25,
+	PIN_26 = 26,
+	PIN_27 = 27,
+	PIN_28 = 28,
+	PIN_29 = 29,
+	PIN_30 = 30,
+	PIN_31 = 31,
+};
+
+/**
+ * The pull configuration for a GPIO line.
+ */
+enum gpio_pull_configuration {
+    /** Keep the GPIO in a floating state when the circuit is open */
+	NO_PULL = 0,
+
+    /** Force the signal to the `LOW` level when the circuit is open */
+	PULL_DOWN = 1,
+
+	/** Force the signal to the `HIGH` level when the circuit is open */
+	PULL_UP = 3,
+};
+
+/**
+ * The drive configuration for a GPIO line.
+ */
+enum gpio_drive_configuration {
+    /** Standard 0, Standard 1 */
+	S0S1 = 0,
+
+	/** High drive 0, Standard 1 */
+	H0S1 = 1,
+
+	/** Standard 0, High drive 1 */
+	S0H1 = 2,
+
+	/** High drive 0, High Drive 1 */
+	H0H1 = 3,
+
+	/** Disconnect 0, Standard 1 */
+	D0S1 = 4,
+
+	/** Disconnect 0, High drive 1 */
+	D0H1 = 5,
+
+	/** Standard 0, Disconnect 1 */
+	S0D1 = 6,
+
+	/** High drive 0, Disconnect 1 */
+	H0D1 = 7,
+};
+
+/**
+ * Init the given pin as an input.
+ */
+void gpio_input_pin_init(enum gpio_pin pin, enum gpio_pull_configuration pull_config, enum gpio_level sensibility);
+
+/**
+ * Init the given pin as output.
+ */
+void gpio_output_pin_init(enum gpio_pin pin, enum gpio_drive_configuration drive_config);
+
+/**
+ * Disable a GPIO pin.
+ */
+u8 gpio_pin_disable(enum gpio_pin pin);
+
+/**
+ * Read the current signal level of the given GPIO pin.
+ */
+enum gpio_level gpio_pin_get_level(enum gpio_pin pin);
+
+/**
+ * Set the given GPIO pin to the given level.
+ */
+void gpio_pin_set_level(enum gpio_pin pin, enum gpio_level level);
+
+#endif