Joel Webb
Small portion of code to verify correctly working hardware and connections
Revision 0:c0833789892f, committed 2016-03-01
- Comitter:
- el14jw
- Date:
- Tue Mar 01 18:54:39 2016 +0000
- Commit message:
- Initial code to check hardware connections in the components stated
Changed in this revision
diff -r 000000000000 -r c0833789892f N5110.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/N5110.lib Tue Mar 01 18:54:39 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/eencae/code/N5110/#ba8addc061ea
diff -r 000000000000 -r c0833789892f main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Mar 01 18:54:39 2016 +0000
@@ -0,0 +1,185 @@
+/*
+Initial prototyping to check hardware connections
+
+Testing the following connections:
+
+Joystick:
+xPot yPot button
+AnalogIn PTB11, AnalogIn PTB10, PTB9
+
+Nokia 5110 lcd display: (Handled by library)
+VCC SCE RST D/C MOSI SCLK LED
+PTE26, PTA0, PTC4, PTD0, PTD2, PTD1, PTC3
+
+buttonA buttonB g_led buzzer
+PTA1 PTB23 PWM PTC11 Undecided between AnalogOut DAC0_OUT or PWM PTC10 (decision will be based on sound quality)
+
+01/03/16
+By Joel W. Webb
+Revision 1.0
+*/
+
+#include "mbed.h"
+#include "N5110.h"
+
+#define DIRECTION_TOLERANCE 0.05
+
+// Nokia lcd object
+// VCC SCE RST D/C MOSI SCLK LED
+N5110 lcd(PTE26, PTA0, PTC4, PTD0, PTD2, PTD1, PTC3);
+
+// Joystick
+AnalogIn xPot(PTB11);
+AnalogIn yPot(PTB10);
+DigitalIn button(PTB9);
+
+enum DirectionName {
+ UP,
+ DOWN,
+ LEFT,
+ RIGHT,
+ CENTRE,
+ UNKNOWN
+};
+
+// struct for Joystick
+typedef struct JoyStick Joystick;
+struct JoyStick {
+ float x; // current x value
+ float x0; // 'centred' x value
+ float y; // current y value
+ float y0; // 'centred' y value
+ int button; // button state (assume pull-down used, so 1 = pressed, 0 = unpressed)
+ DirectionName direction; // current direction
+};
+// create struct variable
+Joystick joystick;
+Ticker pollJoystick; // Ticker interrput for polling the joystick
+
+// Other inputs/outputs
+InterruptIn buttonA(PTA1);
+InterruptIn buttonB(PTB23);
+PwmOut g_led(PTC11);
+DigitalOut r_led(LED1); // Testing led
+
+//Global Flags defined here
+int g_joystick_flag;
+int g_buttonA_flag;
+int g_buttonB_flag;
+
+// ISR defined here
+void buttonA_isr(){
+ g_buttonA_flag = 1;
+}
+void buttonB_isr(){
+ g_buttonB_flag = 1;
+}
+
+// Functions defined here
+void initInputs();
+void updateJoystick();
+void calibrateJoystick();
+
+int main()
+{
+ initInputs();
+ pollJoystick.attach(&updateJoystick,1.0/10.0); // read joystick 10 times per second
+
+ while (true) {
+
+ if (g_buttonA_flag){
+ g_buttonA_flag = 0;
+ lcd.clear();
+ lcd.printString("Button A",0,0);
+ }
+ if (g_buttonB_flag){
+ g_buttonB_flag = 0;
+ lcd.clear();
+ lcd.printString("Button B",0,1);
+ }
+ if (g_joystick_flag){
+ g_joystick_flag = 0;
+ lcd.printString(" ",0,2);
+ if (joystick.direction == 0){ lcd.printString("UP",0,2); }
+ else if (joystick.direction == 1){ lcd.printString("DOWN",0,2); }
+ else if (joystick.direction == 2){ lcd.printString("LEFT",0,2); }
+ else if (joystick.direction == 3){ lcd.printString("RIGHT",0,2); }
+ else if (joystick.direction == 4){ lcd.printString("CENTRE",0,2); }
+ else if (joystick.direction == 5){ lcd.printString("UNDEFINED",0,2); }
+ if (joystick.button){ lcd.printString("Button J",0,3); }
+ }
+
+ lcd.refresh();
+ sleep();
+
+ }
+}
+
+
+
+void initInputs(){
+
+ r_led = 1;
+ // Initialising power LED
+ g_led.period(0.001); // Frequency of 1kHz
+ g_led = 0.25; // Duty cycle of 0.25
+
+ // Setting up Interrupt service routines for input buttons
+ // Note no pull mode is specified so default pulldown resistors will be used
+ buttonA.rise(&buttonA_isr);
+ buttonB.rise(&buttonB_isr);
+ buttonA.mode(PullDown);
+ buttonB.mode(PullDown);
+
+
+ //Testing LCD display works (splash screen)
+ lcd.init();
+ wait(1.0);
+ lcd.printString("Calibrating",0,0);
+ lcd.printString("Do not move",0,1);
+ lcd.printString("Joystick",0,2);
+ lcd.refresh();
+
+ calibrateJoystick();
+
+ wait(1.0);
+ lcd.clear();
+
+}
+
+// read default positions of the joystick to calibrate later readings
+void calibrateJoystick()
+{
+ button.mode(PullDown);
+ // must not move during calibration
+ joystick.x0 = xPot; // initial positions in the range 0.0 to 1.0 (0.5 if centred exactly)
+ joystick.y0 = yPot;
+}
+void updateJoystick()
+{
+ // read current joystick values relative to calibrated values (in range -0.5 to 0.5, 0.0 is centred)
+ joystick.x = xPot - joystick.x0;
+ joystick.y = yPot - joystick.y0;
+ // read button state
+ joystick.button = button;
+
+ // calculate direction depending on x,y values
+ // tolerance allows a little lee-way in case joystick not exactly in the stated direction
+ if ( fabs(joystick.y) < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+ joystick.direction = CENTRE;
+ } else if ( joystick.y > DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+ joystick.direction = UP;
+ } else if ( joystick.y < DIRECTION_TOLERANCE && fabs(joystick.x) < DIRECTION_TOLERANCE) {
+ joystick.direction = DOWN;
+ } else if ( joystick.x > DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+ joystick.direction = RIGHT;
+ } else if ( joystick.x < DIRECTION_TOLERANCE && fabs(joystick.y) < DIRECTION_TOLERANCE) {
+ joystick.direction = LEFT;
+ } else {
+ joystick.direction = UNKNOWN;
+ }
+
+ // set flag for printing
+ g_joystick_flag = 1;
+}
+
diff -r 000000000000 -r c0833789892f mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Mar 01 18:54:39 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/252557024ec3 \ No newline at end of file