T.H. Lu / Mbed 2 deprecated Accelestick

Use Accelerometer and Joystick to mimic a mouse. This is for a class project. It is done for educational purpose. It is not practical to real world use.

Dependencies:   C12832_lcd MMA7660 USBDevice mbed

accelestick.h@2:3d012df30652, 2014-03-28 (annotated)

Committer:
thlu
Date:
Fri Mar 28 06:08:33 2014 +0000
Revision:
2:3d012df30652
Parent:
1:03d0f8a4a2d7 
Fixed filter_noise comparison logic.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
thlu 1:03d0f8a4a2d7 1 // Name: T.H. Lu
thlu 1:03d0f8a4a2d7 2 // Date: 03/27/2014
thlu 1:03d0f8a4a2d7 3 // Description:
thlu 1:03d0f8a4a2d7 4 // Header file for accelestick. Contains all defines and function declarations.
thlu 1:03d0f8a4a2d7 5 //
thlu 1:03d0f8a4a2d7 6
thlu 0:22bdcdc386df 7 #include <stdlib.h>
thlu 0:22bdcdc386df 8 #include "mbed.h"
thlu 0:22bdcdc386df 9
thlu 1:03d0f8a4a2d7 10 #include "MMA7660.h" // Accelerometer API
thlu 1:03d0f8a4a2d7 11 #include "C12832_lcd.h" // LCD API
thlu 1:03d0f8a4a2d7 12 #include "USBMouseKeyboard.h"// USB Mouse API
thlu 0:22bdcdc386df 13
thlu 1:03d0f8a4a2d7 14 #ifndef ACCELESTICK_H
thlu 1:03d0f8a4a2d7 15 #define ACCELESTICK_H
thlu 0:22bdcdc386df 16
thlu 2:3d012df30652 17 #define SCALE_X 50 // float to int conversion factor
thlu 0:22bdcdc386df 18 #define SCALE_Y SCALE_X
thlu 0:22bdcdc386df 19 #define SCALE_Z SCALE_X
thlu 2:3d012df30652 20 #define NOISE_FLOOR 0.10*SCALE_X // zero out any integer g value less than NOISE_FLOOR
thlu 1:03d0f8a4a2d7 21
thlu 0:22bdcdc386df 22 #define ACCEL_MIN -1.5
thlu 0:22bdcdc386df 23 #define ACCEL_MAX 1.5
thlu 0:22bdcdc386df 24
thlu 0:22bdcdc386df 25 #define CALIB_SMPLS 16 // number of samples used for calibrating accelerometer
thlu 0:22bdcdc386df 26
thlu 0:22bdcdc386df 27 // Joystick button values based on joyb declaration
thlu 1:03d0f8a4a2d7 28 enum {JS_NONE=0, JS_DOWN=1, JS_LEFT=2, JS_CENTER=4, JS_UP=8, JS_RIGHT=16};
thlu 1:03d0f8a4a2d7 29 enum {LED_LOCK=0, LED_DEBUG, LED_CALIB, LED_ALIVE};
thlu 0:22bdcdc386df 30
thlu 1:03d0f8a4a2d7 31 // structure to store max and min g values for debugging
thlu 0:22bdcdc386df 32 typedef struct s_max_min {
thlu 0:22bdcdc386df 33 float max_x, max_y, max_z;
thlu 0:22bdcdc386df 34 float min_x, min_y, min_z;
thlu 0:22bdcdc386df 35 } Max_min_t;
thlu 0:22bdcdc386df 36
thlu 1:03d0f8a4a2d7 37 // structure for accelerometer int g values
thlu 0:22bdcdc386df 38 typedef struct s_int_g {
thlu 0:22bdcdc386df 39 int16_t x, y, z;
thlu 0:22bdcdc386df 40 } G_int_t;
thlu 0:22bdcdc386df 41
thlu 1:03d0f8a4a2d7 42 // structure for accelerometer float g values
thlu 0:22bdcdc386df 43 typedef struct s_float_pos {
thlu 0:22bdcdc386df 44 float x, y, z;
thlu 0:22bdcdc386df 45 } G_float_t;
thlu 0:22bdcdc386df 46
thlu 1:03d0f8a4a2d7 47 // structure to store all mouse related data
thlu 0:22bdcdc386df 48 typedef struct
thlu 0:22bdcdc386df 49 {
thlu 0:22bdcdc386df 50 int16_t x, y, z; // x, y, z position
thlu 0:22bdcdc386df 51 uint8_t button; // left button, 1 = left, 2 = center, 4 = middle
thlu 0:22bdcdc386df 52 bool dc; // double click
thlu 0:22bdcdc386df 53 int8_t scroll; // <0 to go up, >0 to go down
thlu 0:22bdcdc386df 54 } Mouse_state_t;
thlu 0:22bdcdc386df 55
thlu 0:22bdcdc386df 56
thlu 0:22bdcdc386df 57 //--- Functions Declaration ---//
thlu 0:22bdcdc386df 58
thlu 1:03d0f8a4a2d7 59 // scan joystick for mouse buttons and scroll
thlu 1:03d0f8a4a2d7 60 void get_joystick_input();
thlu 1:03d0f8a4a2d7 61
thlu 1:03d0f8a4a2d7 62 // sample accelerometer values for mouse movement
thlu 1:03d0f8a4a2d7 63 void sample_mma();
thlu 1:03d0f8a4a2d7 64
thlu 0:22bdcdc386df 65 // calibrate accelerometer
thlu 0:22bdcdc386df 66 void calib_mma(G_int_t current);
thlu 0:22bdcdc386df 67
thlu 1:03d0f8a4a2d7 68 // update mouse position and buttons
thlu 1:03d0f8a4a2d7 69 void update_mouse();
thlu 1:03d0f8a4a2d7 70
thlu 1:03d0f8a4a2d7 71 // print debug messages to USB serial
thlu 1:03d0f8a4a2d7 72 void print_debug_msg();
thlu 1:03d0f8a4a2d7 73
thlu 2:3d012df30652 74 // filter out accelestick noise
thlu 2:3d012df30652 75 int16_t filter_noise(int16_t const);
thlu 1:03d0f8a4a2d7 76
thlu 1:03d0f8a4a2d7 77 // flash specified LED. Needed 2 copies because Ticker cannot attach functions with parameters
thlu 1:03d0f8a4a2d7 78 void flash_led2();
thlu 1:03d0f8a4a2d7 79 void flash_led3();
thlu 1:03d0f8a4a2d7 80
thlu 0:22bdcdc386df 81 // convert floating MMA g value into integer
thlu 0:22bdcdc386df 82 G_int_t conv_g2int(G_float_t mma_g);
thlu 0:22bdcdc386df 83
thlu 0:22bdcdc386df 84 int8_t init_accelestick();
thlu 1:03d0f8a4a2d7 85 void run_accelestick();
thlu 0:22bdcdc386df 86
thlu 0:22bdcdc386df 87 #endif