Diff: main.cpp

Revision:

0:c831d14afee7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jul 20 04:34:34 2020 +0000
@@ -0,0 +1,131 @@
+//UART - SERIAL INTERRUPT ADVANCE PART
+
+//READ DATA FROM SLAVE DEVICE USING UART PORT
+
+/* NOTE *****************************************************************
+
+If you use normal Serial object than you can face problems of Mutex lock when using Interrupt Handller
+
+That leads to crash on board OS, and you can see the error message on Terminal 
+
+Instead of Serial use --> Rawserial object , so you will not face any problems when using IRQ handler
+
+*******************************************************************   */
+
+/*  About Program : --------------------------------------------------------
+Slave board providing data with different Baud rate -57600
+PC connected with STM Nucleo with 9600 Baud rate
+STM CONNECTED WITH PC AND SLAVE With UART Port
+----------------------------------------------------------------------------- */
+
+/* CREATOR  ---
+CREATED BY : JAYDEEP SHAH
+SUBJECT : RECEIVE DATA USING UART IRQ
+radhey04ec@gmail.com
+------   */
+
+
+
+#include "mbed.h"
+#define BUFFER_SIZE 90   //SIZE OF BUFFER   ---DEPENDS ON YOUR DATA SIZE
+
+char rxBuffer[BUFFER_SIZE];  //CREATE CIRCULAR BUFFER  -- TO STORE RECEIVE DATA
+
+unsigned int bufferReadingIndex=0;  //CREATE POINTER TO READ DATA FROM UART AND STORE INTO ARRAY
+
+unsigned int i=0; //counter to read data from buffer Array
+
+// 0 - Rx - PA_0   : Board Tx ___ Arduino Connector socket >>> First_pin _Orange  -- If FTDI CABLE USE
+// 1 - Tx - PA_1   : Board Rx ____ Arduino connector socket  >>> Second_pin _red  -- If FTDI CABLE USE
+
+//If you use only Serial calss , there is chance of damage OS because of MUTEX GUARD
+
+//use RawSerial class
+RawSerial UT(PA_0,PA_1);  //UART PIN DECLARATION
+RawSerial pc(USBTX,USBRX);  //HOST PC TERMINAL  - 9600 BAUD WITH 8-N-1 STTING
+
+//NOTE : UT OBJ FOR SLAVE BOARD & pc OBJ FOR TERMINAL
+
+//DEFINE Rx Interrupt function --DECLARATION
+void RxInterrupt(void);
+
+//Function that read response data
+void response(void);
+
+
+int main()
+{
+UT.baud(57600);  //BAUD RATE SETTING
+UT.format(8,Serial::None,1);   //FORMAT OF UART COMMUNICATION
+
+//INTERRUPT ATTACHMENT WHEN RECEIVE DATA
+UT.attach(&RxInterrupt,Serial::RxIrq);
+
+pc.printf("\n TESTING TURN ON : \n");
+wait(1);
+
+UT.putc('T');  //ENTER IN TEST MODE  -- SLAVE BOARD ENTER INTO TEST MODE
+wait(0.5);
+response();  //Read Response from Slave 
+
+
+ThisThread::sleep_for(1000);
+
+UT.putc('d');   // RED LED OF SLAVE BOARD ON
+wait(1);
+response(); //Read Response from Slave
+
+ThisThread::sleep_for(5000);
+
+
+UT.putc('b');  // RED LED OF SLAVE BOARD OFF
+wait(1);
+response();  //Read Response from slave
+
+ThisThread::sleep_for(1000);
+
+UT.putc('Q');  //QUIT FROM TEST MODE -- NORMAL MODE SELECT
+wait(1);
+response();//Read response from Slave
+
+ThisThread::sleep_for(3000);
+
+while(1)
+{
+}
+
+}
+
+
+void RxInterrupt()      //if Rx buffer have data --- Interrupt call
+{
+    if(UT.readable())  //IF data available
+    {
+        rxBuffer[bufferReadingIndex++] = UT.getc();   // read and store into Buffer
+        if(bufferReadingIndex >= BUFFER_SIZE)  // If limit cross
+        {
+            bufferReadingIndex =0; // RESET CONTER
+        }
+    }
+}
+
+void response()  //FUNCTION TO READ DATA
+{
+    char rxByte;
+
+    while(i != bufferReadingIndex)  //READ WHILE COMPLETE DATA NOT RECEIVED
+    {
+        rxByte = rxBuffer[i];  //READ DATA ONE BY ONE CHARACTER
+        pc.putc(rxByte); // SEND ON TERMINAL
+        i++;  //COUNTER INCREMENT
+        
+        if(i >= BUFFER_SIZE) //IF LIMIT CROSS
+        {
+            i = 0;   //RESET COUNTER
+        }
+    }
+//NO NEED TO USE BELOW DATA LOGIC   
+//i = 0;
+//bufferReadingIndex = 0;
+}
+        
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