Revision 0:b49d36e03092, committed 2010-05-15

Comitter:

tecnosys

Date:

Sat May 15 06:26:05 2010 +0000

Child:

1:9274ae9e3938

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat May 15 06:26:05 2010 +0000
@@ -0,0 +1,22 @@
+#include "mbed.h"
+#include "max6675.h"
+
+
+SPI spi(p11,p12,p13);
+
+max6675 max(spi,p18);
+Serial pc(USBTX,USBRX);
+
+int main() {
+
+
+    while (1) {
+    
+        float temp = max.read_temp();
+        printf("\n\rT: %f",temp );
+       
+        wait(.25);
+    }
+
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max6675.cpp	Sat May 15 06:26:05 2010 +0000
@@ -0,0 +1,42 @@
+
+#include <mbed.h>
+#include "max6675.h"
+
+max6675::max6675(SPI& _spi, PinName _ncs) : spi(_spi), ncs(_ncs) {
+
+}
+
+float max6675::read_temp() {
+    short value = 0;
+    float temp = 0;
+    
+    uint8_t highByte=0;
+    uint8_t lowByte=0;
+    
+    select();
+    wait(.25); //This delay is needed else it does'nt seem to update the temp
+
+    highByte = spi.write(0);
+    lowByte = spi.write(0);
+    deselect();
+
+
+    if (lowByte & (1<<2)) {
+        printf("No Probe");
+    } else {
+        value = (highByte << 5 | lowByte>>3);
+    }
+
+    temp = (value*0.25); // Multiply the value by 0.25 to get temp in ˚C or
+                         //  * (9.0/5.0)) + 32.0;   // Convert value to ˚F (ensure proper floats!)
+
+return temp;
+}
+
+void max6675::select() {
+    ncs = 0;
+}
+
+void max6675::deselect() {
+    ncs = 1;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max6675.h	Sat May 15 06:26:05 2010 +0000
@@ -0,0 +1,25 @@
+#ifndef MAX6675_h
+#define MAX6675_h
+
+#include "mbed.h"
+
+class max6675
+{
+    SPI& spi;
+    DigitalOut ncs;
+  public:
+  
+    max6675(SPI& _spi, PinName _ncs);
+    void select();
+    void deselect();
+    
+    float read_temp();
+  private:
+    PinName _CS_pin;
+    PinName _SO_pin;
+    PinName _SCK_pin;
+    int _units;
+    float _error;
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat May 15 06:26:05 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0