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All the commit done for assignment 3
Dependencies: MCP23017 Servo WattBob_TextLCD mbed mbed-rtos
main.cpp
- Committer:
- xouf2114
- Date:
- 2017-04-04
- Revision:
- 4:9f5ebb8d85ba
- Parent:
- 3:e8046c9a605c
- Child:
- 5:72f209412e34
File content as of revision 4:9f5ebb8d85ba:
/***************************************************************************************************** Assigment 3 Embedded Software This Software is a Car Control Software as no Real Car can be connected it Simulates a car as well. For the Display it uses an LCD Screen For the Speedometer it uses a Servo The Emulation and Synchronisation is implemented using TimerThreads and Semaphores for the reason of existing thread limits, conventional timers are helping to slicing timeslots @author Xavier Gouesnard H00258183 ******************************************************************************************************/ #include "mbed.h" #include "MCP23017.h" // include 16-bit parallel I/O header file #include "WattBob_TextLCD.h" // include 2*16 character display header file #include "rtos.h" #include "Servo.h" #include <deque> //#define OS_TIMERCBQS 20 // define a new number of timers we want +1 timer! //#define OS_TASKCNT 20 // maximum threads MCP23017 *par_port; // pointer to 16-bit parallel I/O object WattBob_TextLCD *lcd; // pointer to 2*16 chacater LCD object Serial serpc(USBTX, USBRX); // serial usb connection tx, rx AnalogIn AinBreak(p18); // Port for the Break Value AnalogIn AinAccel(p19); // Port for the Accelerator Value DigitalIn DinSwitchEngine(p11); // Port for the Engine Switch DigitalIn DinSwitchLight(p12); // Port for the Light Switch DigitalIn DinSwitchRindic(p13); // Port for the Right Indicator DigitalIn DinSwitchLindic(p15); // Port for the Left Indicator Servo Odometer(p25); DigitalOut LEDSpeedWarning(p8); DigitalOut DoutLEDLight(LED1); // Output Port for LED1 DigitalOut DoutLEDLeft(LED2); // Output Port for LED2 DigitalOut DoutLEDRight(LED3); // Output Port for LED3 DigitalOut DoutLEDEngine(LED4); // Output Port for LED4 void Timer1_void(void const *args); // Timer 1 void Timer2_void(void const *args); // Timer 2 void Timer3_void(void const *args); // Timer 3 // Task Functions void Task_1_break_accelerate(); void Task_2_read_show_engine_state(); void Task_3_show_odometer(); void Task_4_speed_warning(); void Task_5_update_odometer(); void Task_6_fill_mail_queue(); void Task_7_dump_mail_to_serial(); void Task_8_read_single_side_light(); void Task_9_read_indicators(); void Task_10_calc_avg_speed(); void Task_11_emulate_car(); // Init Variables int Convert_Hz_to_Ms(double Hz); float accerlator(0); float speed(0); float avgSpeed(0); float brake(0); float dist(0); bool engine(0); bool indicator_L(1); bool indicator_R(1); bool sw_timer1(0); bool sw_timer11(0); bool sw_timer2(0); bool sw_timer21(0); int sw_timer3(4); // sw_timer3 initalize with a first run std::deque<float> AvgSpeedDB; // used for storing the average speed Semaphore SemAvgSpeedDB(1); // declare used Semaphores Semaphore SemAvgSpeed(1); Semaphore SemSpeed(1); Semaphore SemBreak_Accelerate(1); Semaphore SemDistance(1); Semaphore SemEngine(1); Semaphore SemMailCnT(1); typedef struct { float speed; float accel; float brake; } mail_t; int mailcounter(0); // counts the mails in the queue Mail<mail_t, 100> mail_box; // the mail queue has a maximum size of 100 mails int main() { // 10.0 Hz = 00100 ms // 2.0 Hz = 00500 ms // 5.0 Hz = 00200 ms // 1.0 Hz = 01000 ms // 0.5 Hz = 02000 ms // 0.2 Hz = 05000 ms // 0.05 Hz = 20000 ms serpc.baud(19200); // setup the bautrate serpc.printf("Init Software\r\n"); par_port = new MCP23017(p9, p10, 0x40); // initialise 16-bit I/O chip (0x40 = 64) lcd = new WattBob_TextLCD(par_port); // initialise 2*26 char display par_port->write_bit(1,BL_BIT); // turn LCD backlight ON lcd->cls(); // clear display lcd->locate(0,0); // set cursor to location (0,0) - top left corner RtosTimer Timer1(Timer1_void,osTimerPeriodic,(void *)NULL); // create the necesarry timers to overcome a thread issue (max threads) Timer1.start(Convert_Hz_to_Ms(20.0)); RtosTimer Timer2(Timer2_void,osTimerPeriodic,(void *)NULL); Timer2.start(Convert_Hz_to_Ms(2.0)); RtosTimer Timer3(Timer3_void,osTimerPeriodic,(void *)NULL); Timer3.start(Convert_Hz_to_Ms(0.2)); Thread::wait(osWaitForever); } /* ############################################################## Timer 1 runs at 10 Hz Task_11_emulate_car(); Task_1_break_accelerate(); Task_10_calc_avg_speed(); ############################################################# */ void Timer1_void(void const *args) { Task_11_emulate_car(); // runs every time, so at 10 Hz sw_timer1 = !sw_timer1; if(sw_timer1) { // runs just every second time, so at 10 hz Task_1_break_accelerate(); sw_timer11 = !sw_timer11; if(sw_timer11) { // runs just every fourth time, so at 0.5 hz Task_10_calc_avg_speed(); } } } /* ############################################################## Timer 2 runs at 2 Hz, but starts tasks at 2 Hz, 1 Hz, 0.5 Hz Task_2_read_show_engine_state(); Task_5_update_odometer(); Updates Indicators Task_3_show_odometer(); Task_8_read_single_side_light(); Task_4_speed_warning(); Task_9_read_indicators(); ############################################################# */ void Timer2_void(void const *args) // timer runs at 2 hz { Task_2_read_show_engine_state(); Task_5_update_odometer(); sw_timer2 = !sw_timer2; if(indicator_L && indicator_R ) { // Sets the Left and Right Inidcators DoutLEDLeft=!DoutLEDRight; // needs to get the inverted status of led1 before led1 is changed DoutLEDRight=!DoutLEDRight; } else if (!indicator_R && !indicator_L) { DoutLEDLeft=0; DoutLEDRight=0; } if(sw_timer2) { // runs just every second time, so at 1 hz Task_3_show_odometer(); Task_8_read_single_side_light(); sw_timer21 = !sw_timer21; if (!indicator_R && indicator_L) { // switch the left / right indicator DoutLEDRight=0; DoutLEDLeft=!DoutLEDLeft; } else if(indicator_R && !indicator_L) { DoutLEDRight=!DoutLEDRight; DoutLEDLeft=0; } if(sw_timer21) { // runs just every second time, so at 0.5 hz Task_4_speed_warning(); Task_9_read_indicators(); } } } /* ############################################################## Timer 3 runs at 0.2 Hz, but starts tasks at 0.2 Hz and 0.05 Hz Task_6_fill_mail_queue(); Task_7_dump_mail_to_serial(); ############################################################## */ void Timer3_void(void const *args) // timer runs at 0.2 hz { Task_6_fill_mail_queue(); if((sw_timer3%4)==0) { // task runs at 0.05 Hz Task_7_dump_mail_to_serial(); // dump the queue to serial sw_timer3=0; // reset the timer } sw_timer3++; } /* Reads the brake / acceleration of the car */ void Task_1_break_accelerate() { // Let the Semaphores wait SemBreak_Accelerate.wait(); accerlator = AinAccel; // save the accerlator value brake = AinBreak; // save the brake value // Let the Semaphores release SemBreak_Accelerate.release(); } /* Reads the Engine On/Off Switch and displays its state */ void Task_2_read_show_engine_state() { // Let the Semaphores wait SemEngine.wait(); engine = DinSwitchEngine; // read the engine state DoutLEDEngine = engine; // write the engine state // Let the Semaphores release SemEngine.release(); } /* Updates the Odometer (Servo Motor) */ void Task_3_show_odometer() { // Let the Semaphores wait SemAvgSpeed.wait(); Odometer = avgSpeed/250.0; // Calculate the odometer // Let the Semaphores release SemAvgSpeed.release(); } /* Indicates a Speed warning at 75 Mph */ void Task_4_speed_warning() { // Let the Semaphores wait SemAvgSpeed.wait(); if(avgSpeed>70.0) // check our speed LEDSpeedWarning = !LEDSpeedWarning; // and switch the Warning on/off else LEDSpeedWarning = 0; // Let the Semaphores release SemAvgSpeed.release(); } /* Updates the LCD Display */ void Task_5_update_odometer() { // Let the Semaphores wait SemDistance.wait(); SemAvgSpeed.wait(); lcd->locate(0,0); // set cursor to location (0,0) - top left corner lcd->printf("s: %5.0f",avgSpeed); lcd->locate(1,0); lcd->printf("d: %5.0f",dist); // Let the Semaphores release SemDistance.release(); SemAvgSpeed.release(); } /* Reads the Left and Right Inidcator */ void Task_6_fill_mail_queue() { // Let the Semaphores wait SemMailCnT.wait(); SemBreak_Accelerate.wait(); SemSpeed.wait(); mail_t *mail = mail_box.alloc(); // reserve the space for our new message mail->speed = speed; // fill with values mail->accel = accerlator; mail->brake = brake; mail_box.put(mail); // put the new message into the mail queue mailcounter++; // Let the Semaphores release SemBreak_Accelerate.release(); SemSpeed.release(); SemMailCnT.release(); } /* Reads the Mail Queue and Sends the Content to the Serial Port */ void Task_7_dump_mail_to_serial() { // Let the Semaphores wait SemMailCnT.wait(); while(mailcounter) { // as long as we got mail osEvent evt = mail_box.get(); // we are getting them if (evt.status == osEventMail) { mail_t *mail = (mail_t*)evt.value.p; // print the mail to serial serpc.printf("\nspeed: %.0f \n\r" , mail->speed); serpc.printf("accerlator: %.2f\n\r" , mail->accel); serpc.printf("brake: %.2f\n\r", mail->brake); mail_box.free(mail); // clear up the mailbox } mailcounter--; } // Release the Semaphores SemMailCnT.release(); } /* Single Side Light */ void Task_8_read_single_side_light() { DoutLEDLight = DinSwitchLight; // Reading the value } /* Reads the Left and Right Inidcator */ void Task_9_read_indicators() { indicator_R = DinSwitchRindic; // Reading the value indicator_L = DinSwitchLindic; // Reading the value } /* Calculates the Average Speed */ void Task_10_calc_avg_speed() { // Let the Semaphores wait SemAvgSpeed.wait(); SemAvgSpeedDB.wait(); float sum(0); for(deque<float>::const_iterator i = AvgSpeedDB.begin(); i != AvgSpeedDB.end(); ++i) sum+= *i; // calculate the average by iterating over the queue avgSpeed = sum/AvgSpeedDB.size(); // Release the Semaphores SemAvgSpeedDB.release(); SemAvgSpeed.release(); } /* Emulates the car */ void Task_11_emulate_car() { // Let the Semaphores wait SemAvgSpeed.wait(); SemAvgSpeedDB.wait(); SemDistance.wait(); SemBreak_Accelerate.wait(); SemSpeed.wait(); SemEngine.wait(); if(accerlator<=brake || !engine) // are we braking more than accelerating? is the engine on? speed = 0; else speed = (accerlator-brake) *0.5 +speed; if(speed>250) speed=250; // maximum speed if(AvgSpeedDB.size()>=4) // if we already got 4 values, we have to AvgSpeedDB.pop_front(); // make space by deleting the oldest value AvgSpeedDB.push_back(speed); // safe a new reading dist += speed * 1.0/20.0; // runs at 20 Hz so we have to take this into account // Release the Semaphores SemDistance.release(); SemAvgSpeed.release(); SemAvgSpeedDB.release(); SemBreak_Accelerate.release(); SemSpeed.release(); SemEngine.release(); } /* Function used for converting Hz to Ms for a Steps */ int Convert_Hz_to_Ms(double Hz) { return 1000.0 / Hz; }