Revision 0:464e44ee4534, committed 2015-04-02

Comitter:

emcu

Date:

Thu Apr 02 00:01:21 2015 +0000

Commit message:

NUCLEO-F334R8; This program show this functionality:; USART2 (Virtual Com for debug); USART1; DigitalIn; Decimal to Binary conversion; CRC calculation

Changed in this revision

diff -r 000000000000 -r 464e44ee4534 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Apr 02 00:01:21 2015 +0000
@@ -0,0 +1,360 @@
+#include "mbed.h"
+/*
+ 
+ Last chage:    21-03-2014
+
+ Project Name:  NucleoF334R8-DigIN-CRC-DECtoBIN
+
+ By:            www.emcu.it - Enrico Marinoni
+ 
+ NOTE: see here: http://www.emcu.it/NUCLEOevaBoards/NUCLEOevaBoards.html#Tutorial
+ 
+ 
+    This program show this functionality:
+        USART2 (Virtual Com for debug)
+        USART1
+        DigitalIn
+        Decimal to Binary conversion
+        CRC calculation
+    NOTE:
+        A jumper must be present from PB_6 to PA_10 (USART1)
+        More details  are available here:
+        http://www.emcu.it/NUCLEOevaBoards/mBed/QSG-Mbed-Library.pdf 
+        
+ 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ 
+  
+  VARIABLEs
+  
+  IO Status -> variable name is: IOStatus
+        Name    Bit Directions  Note
+        Din1    0   IN          PB_8
+        Din2    1   IN          PB_9
+        Din3    2   IN          PA_6 - Not used in this release of FW
+        Din4    3   IN          PA_7    "       "       "       "   
+        RL1     4   OUT         PA_8 Optional 4 Relay shield from SEED STUDIO - Not used in this release of FW
+        RL2     5   OUT         PB_10    "       "       "       "       "    -     "       "       "       "   
+        RL3     6   OUT         PB_4     "       "       "       "       "    -     "       "       "       "   
+        RL4     7   OUT         PB_5     "       "       "       "       "    -     "       "       "       "   
+        
+  ADC Status - Not used in this release of FW
+        Name     Variable Name  Note
+        Ain0        ValAin0     PA_0 - Not used in this release of FW
+        Ain1        ValAin1     PA_1      "       "       "       "   
+        Ain2        ValAin2     PA_4      "       "       "       "   
+        Ain3        ValAin3     PB_0      "       "       "       "   
+        Ain4        ValAin4     PC_1      "       "       "       "   
+        
+  
+  USART2 (RX==D0 - PA_3, TX==D1 - PA2) it is used for debug (connected to the PC) using TeraTerm.
+  USART1 (RX==D2 - PA_10 , TX==D10 - PB_6) it is used for show the way to use another USART.
+  Both USART are used in RX Interrupt mode.
+  The USART parameters are:
+    Baud Rate: 1200 
+    Data: 8
+    Parity: NONE
+    Stop: 1
+    Flow Control: NONE        
+  
+*/          
+
+Serial pc(SERIAL_TX, SERIAL_RX);    // This is USART2 tx, rx
+                                    //      It is used for Debug via VirtualCOM 
+                                    //      I suggest to use Tera TERM on PC
+Serial Serial1(PB_6, PA_10);        // This is USART1 tx, rx
+
+DigitalOut myled(LED1);             // This LED is on NUCLEO-F334R8
+
+DigitalIn BlueButton(USER_BUTTON);  // This is Blue-Button and is on NUCLEO-L153RE
+// Digital InPut - from the field
+DigitalIn Din1(PB_8);
+DigitalIn Din2(PB_9);
+DigitalIn Din3(PA_6);
+DigitalIn Din4(PA_7);
+ 
+#define Pressed 0
+#define NotPressed 1
+#define Enable 1
+#define Disable 0
+#define POLYNOMIAL 0xD8  /* Is for CRC calculation - 11011 followed by 0's */
+ 
+int Car='\0';
+int CarSerial1='\0';
+int n=0;
+int DinStatus = 0;
+int ValCRC = 0;
+
+
+ 
+// Functions -----------------------------------------------------------------------
+void SendToPCtheDinStatusAndCRC(void);
+
+int ReadIO(void);       // Read and return the Din1...4 status
+
+void ConvDecToBin(int); // Convert Decimal number in Binary and send the result
+                        //      to the PC 
+
+uint8_t crcNaive(uint8_t const);
+
+void callback2() // PC - USART2 used for Debug
+    {
+    // Note: you need to actually read from the serial to clear the RX interrupt
+    Car = pc.getc();
+    }
+ 
+void USART1_INT() // USART1
+    {
+    // Note: you need to actually read from the serial to clear the RX interrupt
+    CarSerial1 = Serial1.getc();
+    }
+
+// Interrupt used for flashing the Green Led
+Timeout to1;
+#define ON 1
+#define OFF 0
+#define DLYFlash 0.5
+int ONOFF_Flashing = ON;
+void IntFlash(void);
+
+
+// MAIN program ---------------------------------------------------------------------
+int main() {
+    
+    // Define the USART ports
+    Serial1.attach(&USART1_INT);
+    pc.attach(&callback2);
+
+    // SetUp the baud rate
+    pc.baud(1200);
+    Serial1.baud(1200);    
+        
+        
+    // Set PullUp on Digital Input Pins (Din1...4)
+    Din1.mode(PullUp);
+    Din2.mode(PullUp);
+    Din3.mode(PullUp);
+    Din4.mode(PullUp);
+ 
+    // Start flashing the Green Led
+    ONOFF_Flashing = ON;              // Enabling flashing flag
+    to1.attach(&IntFlash, DLYFlash);  // Enabling flashing Interrupt
+    
+    
+    pc.printf("\n\r\n\r START MAIN - NucleoF334R8-DigIN-CRC-DECtoBIN\n\r");
+    
+    while(1) // Main infinite loop --------------------------------------------------
+    {
+
+    // Test the Blue Button
+    if (BlueButton == Pressed)
+        {
+        while(BlueButton == Pressed)
+            {
+            if (n == 0)
+                pc.printf("Please release the BLUE Button\n\r");
+            n++;
+            }
+        n = 0;
+        pc.printf("The Digital Input status are:\n\r");
+        DinStatus = ReadIO();
+        pc.printf("DinStatus == %x\n\r", DinStatus);
+        pc.printf("Din4 Din3 Din2 Din1\n\r");
+        ConvDecToBin(DinStatus);            
+        
+        // CRC calculation
+        ValCRC = crcNaive(DinStatus);
+        pc.printf("CRC == %d\n\r", ValCRC);
+        
+        ONOFF_Flashing = OFF;   // Disable Interrupt of Green LED
+        
+        // Start flashing the Green Led (enable Interrupt)
+        ONOFF_Flashing = ON;              // Enabling flashing flag
+        to1.attach(&IntFlash, DLYFlash);  // Enabling flashing Interrupt
+            
+        }
+     
+        
+    // Test the char. received from PC - USART2 that is USB Virtual COM 
+    if (Car == 'E')
+        {
+            pc.printf("\n\r - Send char. E (received from USB_VirtualCOM PC-USART2) to USART1\n\r");
+            pc.printf(" - If there is a jumper from PB_6 to PA_10, you will see the Din4...1 status + CRC\n\r");
+            Serial1.putc('E');  // Send char. E to USART1
+            Car = '\0';
+        }
+    
+    
+    if (Car == '?')
+        {
+            // Send to PC the status of Digital Inputs Din1...4
+            SendToPCtheDinStatusAndCRC();    
+            Car = '\0';
+        }        
+    
+         
+    // Test the char. received from AUREL (USART1)
+    if (CarSerial1 == 'E')
+        {
+            pc.printf("RX char. E from USART1\n\r");
+            // Send to PC the status of Digital Inputs Din1...4
+            SendToPCtheDinStatusAndCRC(); 
+            CarSerial1 = '\0';           
+        }
+    }
+    // END Main infinite loop -------------------------------------------------------
+}
+
+
+void SendToPCtheDinStatusAndCRC(void)
+{
+    ONOFF_Flashing = OFF;   // Disable Interrupt of Green LED
+    pc.printf("\n\r- PC request, to know the Digital Inputs Status\n\r");
+    DinStatus = ReadIO();
+    pc.printf("DinStatus == %x\n\r", DinStatus);
+    pc.printf("Din4 Din3 Din2 Din1\n\r");
+    ConvDecToBin(DinStatus);     
+    // CRC calculation
+    ValCRC = crcNaive(DinStatus);
+    pc.printf("CRC related to Din4...1 == %d\n\r", ValCRC);                   
+    Car = '\0';
+    // Start flashing the Green Led (enable Interrupt)
+    ONOFF_Flashing = ON;              // Enabling flashing flag
+    to1.attach(&IntFlash, DLYFlash);  // Enabling flashing Interrupt
+}
+
+
+int ReadIO(void)
+{
+    DigitalIn Din1(PB_8);
+    int DinValue=255;
+    
+    /* Read all the Digital Inputs (Din1...4) and return a DinValue
+    
+        DinValue (bit)             Note
+            0               Din1 - 1 == OPEN, 0 == CLOSE
+            1               Din2 -     "         "
+            2               Din3 -     "         "
+            3               Din4 -     "         "
+    */
+    
+    // Test Din1 status
+    if (Din1 == 0)
+        DinValue = DinValue & 254; // 0
+    else
+        DinValue = DinValue & 255; // 1
+
+    // Test Din2 status
+    if (Din2 == 0)
+        DinValue = DinValue & 253; // 0
+    else
+        DinValue = DinValue & 255; // 1
+
+    // Test Din3 status
+    if (Din3 == 0)
+        DinValue = DinValue & 251; // 0
+    else
+        DinValue = DinValue & 255; // 1
+
+    // Test Din4 status
+    if (Din4 == 0)
+        DinValue = DinValue & 247; // 0
+    else
+        DinValue = DinValue & 255; // 1
+                                            
+    return DinValue;
+}
+
+//
+// Function that convert a Decimal number in Binary
+// the original function is here:
+// http://www.programmingsimplified.com/c/source-code/c-program-convert-decimal-to-binary 
+//
+void ConvDecToBin(int n)
+{
+    int c, k;
+    for (c = 3; c >= 0; c--)
+    {
+        k = n >> c;
+ 
+        if (k & 1)
+            pc.printf("  1  ");
+        else
+            pc.printf("  0  ");
+    }
+    pc.printf("\n\r");
+}
+
+
+//
+// Function that flashing the Green Led
+//    
+void IntFlash(void) 
+{
+    if (ONOFF_Flashing == ON)
+        myled = !myled;
+    else
+        myled = 0;
+    to1.detach();
+    to1.attach(&IntFlash, DLYFlash); // this line reload Interrupt
+}  
+
+
+//
+// CRC calculation
+// Original code is gere: http://www.barrgroup.com/Embedded-Systems/How-To/CRC-Calculation-C-Code
+//
+uint8_t crcNaive(uint8_t const message)
+{
+    uint8_t  remainder; 
+
+
+    /*
+     * Initially, the dividend is the remainder.
+     */
+    remainder = message;
+
+    /*
+     * For each bit position in the message....
+     */
+    for (uint8_t bit = 8; bit > 0; --bit)
+    {
+        /*
+         * If the uppermost bit is a 1...
+         */
+        if (remainder & 0x80)
+        {
+            /*
+             * XOR the previous remainder with the divisor.
+             */
+            remainder ^= POLYNOMIAL;
+        }
+
+        /*
+         * Shift the next bit of the message into the remainder.
+         */
+        remainder = (remainder << 1);
+    }
+
+    /*
+     * Return only the relevant bits of the remainder as CRC.
+     */
+    return (remainder >> 4);
+
+}
\ No newline at end of file

diff -r 000000000000 -r 464e44ee4534 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Apr 02 00:01:21 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/487b796308b0
\ No newline at end of file