Tauqir Hassan / Mbed 2 deprecated Bluetooth_Powered_Multimeter_Using_STM32F429_and_RTOS

A mbed RTOS based multimeter application that sends results to a phone over the Bluetooth module.

Dependencies:   LCD_DISCO_F429ZI mbed mbed-rtos BSP_DISCO_F429ZI

main.cpp@18:545a94c4a5b2, 2021-01-24 (annotated)

Committer:
hunter64288
Date:
Sun Jan 24 01:11:19 2021 +0000
Revision:
18:545a94c4a5b2
Parent:
17:09bea038e7c0 
Published.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:491820ee784d 1 #include "mbed.h"
mbed_official 11:0309bef74ba8 2 #include "rtos.h"
hunter64288 12:441ee5b1cf71 3 #include "LCD_DISCO_F429ZI.h"
hunter64288 17:09bea038e7c0 4
hunter64288 12:441ee5b1cf71 5
hunter64288 17:09bea038e7c0 6 Serial bluetooth(PA_9, PA_10); //Bluetooth Transmitter , Receiver Pins
hunter64288 17:09bea038e7c0 7 AnalogIn ain(PA_0); //Potentiometer Analog Input
hunter64288 17:09bea038e7c0 8 LCD_DISCO_F429ZI lcd; //LCD Library
hunter64288 15:9c5fb6600570 9
hunter64288 17:09bea038e7c0 10 DigitalOut led1(LED1); //LED Outputs
emilmont 1:491820ee784d 11 DigitalOut led2(LED2);
hunter64288 12:441ee5b1cf71 12
hunter64288 17:09bea038e7c0 13
hunter64288 17:09bea038e7c0 14 Thread thread1; //Instantiating threads
hunter64288 12:441ee5b1cf71 15 Thread thread2;
hunter64288 13:d21f6477ba19 16 Thread thread3;
hunter64288 13:d21f6477ba19 17 Thread thread4;
hunter64288 17:09bea038e7c0 18
hunter64288 17:09bea038e7c0 19 typedef struct {
hunter64288 17:09bea038e7c0 20 float voltage;
hunter64288 17:09bea038e7c0 21 float current;
hunter64288 17:09bea038e7c0 22 } results; //struct type for the results
hunter64288 17:09bea038e7c0 23
hunter64288 17:09bea038e7c0 24 MemoryPool<results, 1> mpool; //Creating a memory pool for queue
hunter64288 17:09bea038e7c0 25 Queue<results, 1> queue; //Queue for data transfer
hunter64288 17:09bea038e7c0 26
hunter64288 17:09bea038e7c0 27 Semaphore one_slot(1); //Instantiating a single semaphore resource slot
hunter64288 17:09bea038e7c0 28
hunter64288 17:09bea038e7c0 29
emilmont 1:491820ee784d 30
hunter64288 17:09bea038e7c0 31
hunter64288 17:09bea038e7c0 32
hunter64288 17:09bea038e7c0 33 /*The following functions gets the ADC data & sends the results to the receiver end via memory queue
hunter64288 17:09bea038e7c0 34 Input Parameter : Thread Name */
hunter64288 17:09bea038e7c0 35
hunter64288 15:9c5fb6600570 36 void data_send(void const *name) {
hunter64288 17:09bea038e7c0 37 lcd.Clear(LCD_COLOR_WHITE); //LCD Background Clear
hunter64288 17:09bea038e7c0 38 lcd.DisplayStringAt(0, LINE(1), (uint8_t *)"Sending Data ... ", CENTER_MODE); //Display info on LCD
hunter64288 14:526e0b503646 39
hunter64288 12:441ee5b1cf71 40 while(1) {
hunter64288 17:09bea038e7c0 41 led1 = !led1; //LED1 toggle
hunter64288 17:09bea038e7c0 42 bluetooth.printf("\n(%s has received the data from ADC, now sending it via Queue...)\n\r", (const char *)name);
hunter64288 17:09bea038e7c0 43
hunter64288 17:09bea038e7c0 44 //Thread-1 reads the ADC Data
hunter64288 17:09bea038e7c0 45 results *message = mpool.alloc(); //allocating fixed size memory
hunter64288 17:09bea038e7c0 46 message->voltage = ain.read()*3; //reference voltage = 3v
hunter64288 18:545a94c4a5b2 47 message->current = (ain.read()*3)/100; // voltage/resistance (100 ohm)
hunter64288 17:09bea038e7c0 48 queue.put(message); //Adding data to the queue
hunter64288 17:09bea038e7c0 49 Thread::wait(2000);
hunter64288 12:441ee5b1cf71 50 }
hunter64288 12:441ee5b1cf71 51 }
hunter64288 13:d21f6477ba19 52
hunter64288 15:9c5fb6600570 53
hunter64288 17:09bea038e7c0 54 /*The following function receives the data from the memory queue &
hunter64288 17:09bea038e7c0 55 transmits the data to be displayed over the phone using the Bluetooth module
hunter64288 17:09bea038e7c0 56 Input Parameter : Thread Name */
hunter64288 15:9c5fb6600570 57
hunter64288 17:09bea038e7c0 58 void data_receive(void const *name) {
hunter64288 17:09bea038e7c0 59 lcd.DisplayStringAt(0, LINE(2), (uint8_t *)"Data Received !!", CENTER_MODE); //Display info on LCD
hunter64288 17:09bea038e7c0 60
hunter64288 17:09bea038e7c0 61 while(1) {
hunter64288 17:09bea038e7c0 62 led2 = !led2; //LED2 toggle
hunter64288 17:09bea038e7c0 63
hunter64288 17:09bea038e7c0 64 one_slot.wait(); //wait until a semaphore resource becomes available
hunter64288 17:09bea038e7c0 65
hunter64288 16:c90044414a96 66 bluetooth.printf("\n---------------------------------------------------------------------\n");
hunter64288 16:c90044414a96 67 bluetooth.printf("%s has acquired the semaphore & received the data.\n\r", (const char *)name);
hunter64288 16:c90044414a96 68 bluetooth.printf("\nResults are now displayed by %s\n\r", (const char *)name);
hunter64288 12:441ee5b1cf71 69 Thread::wait(1000);
hunter64288 15:9c5fb6600570 70
hunter64288 17:09bea038e7c0 71 /*Receive queue data and display via Bluetooth*/
hunter64288 17:09bea038e7c0 72
hunter64288 17:09bea038e7c0 73 osEvent evt = queue.get(); // get a message from the queue
hunter64288 17:09bea038e7c0 74
hunter64288 17:09bea038e7c0 75 //check for the message
hunter64288 15:9c5fb6600570 76 if (evt.status == osEventMessage) {
hunter64288 17:09bea038e7c0 77 results *message = (results*)evt.value.p;
hunter64288 16:c90044414a96 78 bluetooth.printf("\nVoltage: %.2f V\n\r" , message->voltage);
hunter64288 16:c90044414a96 79 bluetooth.printf("Current: %.2f A\n\r" , message->current);
hunter64288 15:9c5fb6600570 80 mpool.free(message);}
hunter64288 15:9c5fb6600570 81
hunter64288 17:09bea038e7c0 82 one_slot.release(); //release the semaphore resource
hunter64288 16:c90044414a96 83 bluetooth.printf("\n%s releases semaphore\r", (const char *)name);
hunter64288 15:9c5fb6600570 84 Thread::wait(1000);
hunter64288 15:9c5fb6600570 85
hunter64288 13:d21f6477ba19 86 }
hunter64288 15:9c5fb6600570 87 }
hunter64288 12:441ee5b1cf71 88
hunter64288 14:526e0b503646 89
emilmont 1:491820ee784d 90 int main() {
hunter64288 12:441ee5b1cf71 91 printf("We are in main.\n\r");
hunter64288 12:441ee5b1cf71 92
hunter64288 17:09bea038e7c0 93 thread1.set_priority(osPriorityHigh); //setting Task Priorities
hunter64288 17:09bea038e7c0 94 thread2.set_priority(osPriorityNormal);
hunter64288 17:09bea038e7c0 95 thread3.set_priority(osPriorityNormal);
hunter64288 12:441ee5b1cf71 96
hunter64288 15:9c5fb6600570 97 thread1.start(data_send, (void *)"Thread 1"); // Starting the processes
hunter64288 15:9c5fb6600570 98 thread2.start(data_receive, (void *)"Thread 2");
hunter64288 15:9c5fb6600570 99 thread3.start(data_receive, (void *)"Thread 3");
hunter64288 17:09bea038e7c0 100
hunter64288 17:09bea038e7c0 101 thread1.join(); //synchronization of threads
hunter64288 12:441ee5b1cf71 102 thread2.join();
hunter64288 13:d21f6477ba19 103 thread3.join();
hunter64288 12:441ee5b1cf71 104
hunter64288 12:441ee5b1cf71 105 //wait for threads to complete
hunter64288 12:441ee5b1cf71 106 printf("The end of main.\n\r");
emilmont 1:491820ee784d 107 }
hunter64288 12:441ee5b1cf71 108
hunter64288 12:441ee5b1cf71 109