zephyr: Initial implementation of machine.Pin.

The integration with Zephyr is fairly clean but as MicroPython Hardware API
requires pin ID to be a single value, but Zephyr operates GPIO in terms of
ports and pins, not just pins, a "hierarchical" ID is required, using tuple
of (port, pin). Port is a string, effectively a device name of a GPIO port,
per Zephyr conventions these are "GPIO_0", "GPIO_1", etc.; pin is integer
number of pin with the port (supposed to be in range 0-31).

Example of pin initialization:

pin = Pin(("GPIO_1", 21), Pin.OUT)

(an LED on FRDM-K64F's Port B, Pin 21).

There is support for in/out pins and pull up/pull down but currently
there is no interrupt support.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@linaro.org>
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/zephyr/modmachine.h b/zephyr/modmachine.h
new file mode 100644
index 000000000..596c59b17
--- /dev/null
+++ b/zephyr/modmachine.h
@@ -0,0 +1,16 @@
+#ifndef __MICROPY_INCLUDED_ZEPHYR_MODMACHINE_H__
+#define __MICROPY_INCLUDED_ZEPHYR_MODMACHINE_H__
+
+#include "py/obj.h"
+
+extern const mp_obj_type_t machine_pin_type;
+
+MP_DECLARE_CONST_FUN_OBJ_0(machine_info_obj);
+
+typedef struct _machine_pin_obj_t {
+    mp_obj_base_t base;
+    struct device *port;
+    uint32_t pin;
+} machine_pin_obj_t;
+
+#endif // __MICROPY_INCLUDED_ZEPHYR_MODMACHINE_H__