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-rw-r--r--quantum/joystick.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/quantum/joystick.h b/quantum/joystick.h
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+++ b/quantum/joystick.h
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+#pragma once
+
+#ifndef JOYSTICK_BUTTON_COUNT
+# define JOYSTICK_BUTTON_COUNT 8
+#endif
+
+#ifndef JOYSTICK_AXES_COUNT
+# define JOYSTICK_AXES_COUNT 4
+#endif
+
+#include "quantum.h"
+
+#include <stdint.h>
+
+// configure on input_pin of the joystick_axes array entry to JS_VIRTUAL_AXIS
+// to prevent it from being read from the ADC. This allows outputing forged axis value.
+//
+#define JS_VIRTUAL_AXIS 0xFF
+
+#define JOYSTICK_AXIS_VIRTUAL \
+ { JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, JS_VIRTUAL_AXIS, 0, 1023 }
+#define JOYSTICK_AXIS_IN(INPUT_PIN, LOW, REST, HIGH) \
+ { JS_VIRTUAL_AXIS, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
+#define JOYSTICK_AXIS_IN_OUT(INPUT_PIN, OUTPUT_PIN, LOW, REST, HIGH) \
+ { OUTPUT_PIN, INPUT_PIN, JS_VIRTUAL_AXIS, LOW, REST, HIGH }
+#define JOYSTICK_AXIS_IN_OUT_GROUND(INPUT_PIN, OUTPUT_PIN, GROUND_PIN, LOW, REST, HIGH) \
+ { OUTPUT_PIN, INPUT_PIN, GROUND_PIN, LOW, REST, HIGH }
+
+typedef struct {
+ pin_t output_pin;
+ pin_t input_pin;
+ pin_t ground_pin;
+
+ // the AVR ADC offers 10 bit precision, with significant bits on the higher part
+ uint16_t min_digit;
+ uint16_t mid_digit;
+ uint16_t max_digit;
+} joystick_config_t;
+
+extern joystick_config_t joystick_axes[JOYSTICK_AXES_COUNT];
+
+enum joystick_status { JS_INITIALIZED = 1, JS_UPDATED = 2 };
+
+typedef struct {
+ uint8_t buttons[JOYSTICK_BUTTON_COUNT / 8 + 1];
+
+ int16_t axes[JOYSTICK_AXES_COUNT];
+ uint8_t status : 2;
+} joystick_t;
+
+extern joystick_t joystick_status;
+
+// to be implemented in the hid protocol library
+void send_joystick_packet(joystick_t *joystick);