Revision 2:2a49171453d5, committed 2012-08-03

Comitter:

AjK

Date:

Fri Aug 03 12:28:27 2012 +0000

Parent:

1:46c8c60e744a

Commit message:

Add example4.h and ISR user callback code

Changed in this revision

--- a/ChangeLog.h	Mon Jan 17 01:14:16 2011 +0000
+++ b/ChangeLog.h	Fri Aug 03 12:28:27 2012 +0000
@@ -22,6 +22,9 @@
 
 /*
 
+1.2     03/08/2012
+        Added ability to make a user callback when an IRQ is fired.
+        
 1.1     17/01/2011
         Added this file.
         Altered the way interrupts are disabled. Previously __disable_irq()/__enable_irq()

--- a/MAX3100.cpp	Mon Jan 17 01:14:16 2011 +0000
+++ b/MAX3100.cpp	Fri Aug 03 12:28:27 2012 +0000
@@ -37,6 +37,10 @@
     _cs_obj      = NULL;
     _cs_method   = NULL;
     
+    _isr_user_function = NULL;
+    _isr_user_obj      = NULL;
+    _isr_user_method   = NULL;
+    
     if (cs != NC) {    
         _cs = new DigitalOut(cs);
         _cs->write( 1 );
@@ -254,7 +258,23 @@
         rx_buffer[rx_buffer_in++] = (char)(data & 0xFF);
         if (rx_buffer_in >= MAX3100_RX_BUFFER_SIZE) rx_buffer_in = 0;
         if (rx_buffer_in == rx_buffer_out) rx_buffer_full = true;
-    }        
+    }
+    
+    int isrType = MAX3100::ISR;     
+    
+    if ( data & MAX3100_CONF_R ) {
+        isrType |= MAX3100::ISR_RX;     
+    }
+    
+    if ( tx_ready ) {
+        isrType |= MAX3100::ISR_TX;     
+    }
+    
+    
+    if (_isr_user_function != NULL) (*_isr_user_function)( isrType );
+    else {
+       if (_isr_user_obj && _isr_user_method) (_isr_user_obj->*_isr_user_method)( isrType );
+    }   
 }
 
 void 

--- a/MAX3100.h	Mon Jan 17 01:14:16 2011 +0000
+++ b/MAX3100.h	Fri Aug 03 12:28:27 2012 +0000
@@ -143,6 +143,13 @@
     MAX3100Dummy  *_cs_obj;
     void (MAX3100Dummy::*_cs_method)(int, int);
 
+    // C style callback function pointer for user isr callback.    
+    void (*_isr_user_function)(int); 
+
+    // C++ style callback method pointer for external CS control
+    MAX3100Dummy  *_isr_user_obj;
+    void (MAX3100Dummy::*_isr_user_method)(int);
+    
     // Internal CS control.
     void cs_value(int);
     
@@ -154,6 +161,12 @@
 
 public:
     
+    static const int ISR    = 0;
+    
+    static const int ISR_RX = 1;
+    
+    static const int ISR_TX = 2;
+    
     /** Constructor
      */
     MAX3100() { error( "No pins supplied to constructor" ); }
@@ -319,6 +332,21 @@
         _cs_obj = (MAX3100Dummy *)item; _cs_method = (void (MAX3100Dummy::*)(int, int))method; 
     }
     
+    /** attach_isr_user
+     * is controlling the chip CS line.
+     * @param function A C function pointer
+     */
+    void attach_isr_user(void (*function)(int) = 0) { _isr_user_function = function; }
+    
+    /** attach_isr_user
+     * @param object An object that conatins the callback method.
+     * @param method The method within the object to call.
+     */
+    template<class T> 
+    void attach_isr_user(T* item, void (T::*method)(int)) { 
+        _isr_user_obj = (MAX3100Dummy *)item; _isr_user_method = (void (MAX3100Dummy::*)(int))method; 
+    }
+    
 };
 
 }; // namespace AjK ends.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/example4.h	Fri Aug 03 12:28:27 2012 +0000
@@ -0,0 +1,94 @@
+/*
+    Copyright (c) 2011 Andy Kirkham
+ 
+    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.
+*/
+
+#ifdef MAX3100_EXAMPLE4_COMPILE
+
+/*
+ * This is the same as example1.h but shows how to attach a usre defined callback
+ * function that is called by the ISR.
+ *
+ * Connecting up the MAX3100 for this test program. Note, to form a "loopback"
+ * the MAX3100 TX pin (13) is connected to the RX pin (12). Don't forget thwe Xtal
+ * and power pins that are not shown here. Although I do PullUp mode on the IRQ pin
+ * I still needed a real external pull up resistor on the IRQ line. You may need one
+ * also.
+ *                                    ____________
+ *                                   /            \
+ * Mbed MOSI p5 |-----------------> 1| Din     TX | 13 ------\
+ *      MISO p6 |-----------------> 2| Dout       |          |
+ *      SCLK p7 |-----------------> 3| Sclk    RX | 12 ------/
+ *           p8 |-----------------> 4| CS         |
+ *           p9 |-----------------> 5| IRQ        | MAX3100
+ *                      +5v ------> 6| SHTD       | Xtal and PWR not shown.
+ *                                   \____________/
+ */
+
+#include "mbed.h"
+#include "MAX3100.h"
+
+Serial  pc(USBTX, USBRX);
+MAX3100 max(p5, p6, p7, p8, p9);
+
+// Used to count RX interrupts. Must be declared as
+// volatile as it's used in MyIsrCallback() which is 
+// in ISR context and main() which is user context.
+// See http://mbed.org/users/AjK/notebook/regarding-interrupts-use-and-blocking/
+volatile int isrCounter;
+
+// User function called when an IRQ from the MAX3100 is activated.
+void MyIsrCallback( int isrType ) {
+    // Only count RX IRQs.
+    if ( isrType & MAX3100::ISR_RX ) {
+        isrCounter++;
+    }
+}
+
+int main() {
+    
+    isrCounter = 0;
+    
+    // Set the PC USB serial baud rate.
+    pc.baud(115200);
+    
+    max.attach_isr_user( MyIsrCallback );
+    
+    max.enableRxIrq();
+    max.enableTxIrq();
+    
+    max.printf("\nHello World.\n");
+    
+    // Any byte received on the "USB serial port" is sent to the MAX3100 device.
+    // Any byte received by the MAX3100 device is sent to the "USB serial port".
+    while (1) {
+        if (pc.readable()) {
+            int c = pc.getc();
+            max.putc(c);            
+        }
+        
+        if ( isrCounter > 0 ) {
+            pc.putc( max.getc() );
+            isrCounter--;
+        }
+    }    
+}
+
+#endif