Diff: main.cpp

Revision:

0:459e9fc6e491

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Mar 22 01:13:04 2017 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+ 
+SPI spi(PTC6,PTC7,PTC5); // (MOSI MISO CLK)setup SPI interface on pins PTC5,PTC6,PTC7
+
+DigitalOut cs2(PTC3);
+
+Serial pc(USBTX, USBRX);
+    
+
+ 
+int main() 
+{
+    spi.format(8,0);
+    spi.frequency(1000000);
+    pc.printf("Analog read test from spi.\n");
+   while (true) 
+   {
+    
+        cs2=0;
+        int high_byte = spi.write(0);
+        int low_byte = spi.write(0);
+        cs2=1;
+        float x = ((high_byte & 0x1f) << 7) | ((low_byte >> 1));
+        
+        float r= (float)((x*33)/4096); // show value in volts.
+ 
+    pc.printf("AD Voltage channel value: %f Volt\r\n", r-16.5);
+    pc.printf("Voltage Analog Value: %.2f\n\r",x);
+    wait_ms(500);
+    }    
+    
+   
+}
+   
\ No newline at end of file