Revision 1:67810efb9652, committed 2016-05-05

Comitter:

bonnyngangu

Date:

Thu May 05 15:02:06 2016 +0000

Parent:

0:6a561e8d6713

Commit message:

Joystick reading

Changed in this revision

diff -r 6a561e8d6713 -r 67810efb9652 main.cpp
--- a/main.cpp	Fri Mar 11 09:52:11 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,135 +0,0 @@
-#include "mbed.h"
-#include "N5110.h"
-
-#define BALLRADIUS 2
-
-//          VCC,    SCE,  RST,    D/C,   MOSI,  SCLK,   LED
-N5110 lcd (PTE26 , PTA0 , PTC4 , PTD0 , PTD2 , PTD1 , PTC3);
-// Can also power (VCC) directly from VOUT (3.3 V) -
-// Can give better performance due to current limitation from GPIO pin
-Ticker game_timer;
-
-// struct used to store 2D vectors
-typedef struct vector_t vector_t;
-struct vector_t {
-    float x;
-    float y;
-};
-
-// function prototypes
-void init_display();
-void init_ball();
-void game_timer_isr();
-void redraw_screen();
-void update_physics_engine();
-void check_collisions();
-
-vector_t pos;  // ball position
-vector_t vel;  // ball velocity
-vector_t acc;  // ball acceleration
-
-float refresh_rate = 10.0;  // how often to update display (Hz)
-float g_dt = 1.0F/refresh_rate;  // global to store time step (F makes it a float, gets rid of compiler warning)
-volatile int g_timer_flag = 0;
-
-int main()
-{
-    wait(2.0);  // short delay for power to settle
-    init_display(); // first need to initialise display
-    init_ball();
-    // setup ticker
-    game_timer.attach(&game_timer_isr,g_dt);
-
-    redraw_screen();  // draw initial screen
-
-    while(1) {
-
-        if ( g_timer_flag ) {  // ticker interrupt
-            g_timer_flag = 0;  // clear flag
-            update_physics_engine();
-            check_collisions();
-            redraw_screen();
-        }
-
-        sleep();  // sleep until next interrupt
-
-    }
-}
-
-void redraw_screen()
-{
-    lcd.clear();
-    lcd.drawCircle(pos.x,pos.y,BALLRADIUS,1);  // x,y,radius,black fill
-    lcd.refresh();  // update display
-}
-
-void check_collisions()
-{
-    // see if ball has hit the floor (subtract the radius since the position is the centre of the ball)
-    if ( pos.y >= 47 - BALLRADIUS ) {
-        pos.y = 47 - BALLRADIUS;  // need to force this or else ball can end up going 'underground'
-        vel.y = -0.89 * vel.y;  // y velocity is reflected and dampened 
-        // y accleration is still gravity
-    }
-
-    // has ball gone off the right-hand side?
-    if ( pos.x >= 83 - BALLRADIUS ) {
-        pos.x = 83 - BALLRADIUS;  // need to force this or else ball can end up going off screen
-        vel.x = -0.5 * vel.x;  // reflect and damp velocity
-        acc.x = -acc.x;  // reflect accleration
-    }
-    
-    // what about the left?
-    if ( pos.x <= BALLRADIUS ) {
-        pos.x = BALLRADIUS;  // need to force this or else ball can end up going off screen
-        vel.x = -0.5 * vel.x;  // reflect and damp velocity
-        acc.x = -acc.x;  // reflect accleration
-    }
-
-}
-
-void update_physics_engine()
-{
-    // from Newton's Laws
-
-    acc.x = 0.9F*acc.x;  // reduce a little due to air friction
-
-    // calc new velocity (assume 'unit' time)
-    vel.x = vel.x + acc.x; // * g_gt;
-    vel.y = vel.y + acc.y; // * g_gt;
-
-    // calc new position (assume 'unit' time)
-    pos.x = pos.x + vel.x;// * g_gt;
-    pos.y = pos.y + vel.y;// * g_dt;
-    
-    // should really multiply the above by the time-step,
-    // but since the pixel can only be a integer value,
-    // it makes the motion a little 'jumpy'.
-
-}
-
-void init_ball()
-{
-    // initial position (top-left)
-    pos.x = BALLRADIUS;
-    pos.y = BALLRADIUS;
-    // initial velocity - still
-    vel.x = 0.0;
-    vel.y = 0.0;
-    // initial acceleration - gravity and a bit of push to right
-    acc.x = 0.5;
-    acc.y = 2.0;  // +ve so ball accelerates to bottom of display (top of screen is y=0, bottom is y=47)
-    // should be 9.8, but can play with value to get a 'nice' ball movement
-}
-
-void game_timer_isr()
-{
-    g_timer_flag = 1;
-}
-
-void init_display()
-{
-    lcd.init();
-    lcd.normalMode();      // normal colour mode
-    lcd.setBrightness(0.5); // put LED backlight on 50%
-}
\ No newline at end of file

diff -r 6a561e8d6713 -r 67810efb9652 mbed.bld
--- a/mbed.bld	Fri Mar 11 09:52:11 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/87f2f5183dfb
\ No newline at end of file