Diff: main.cpp

Revision:

0:ce4a539ca1d4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Oct 22 17:36:47 2010 +0000
@@ -0,0 +1,40 @@
+/*     This program is designed to interface with the AS5045 IC encoder
+    It calls a function to read the encoder value every second 
+    The program then prints the vaule to a PC screen via hyperterminal*/
+
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX);
+SPI spi(p5, p6, p7); // mosi, miso, sclk
+DigitalOut cs(p25);
+
+long EncoderValue; 
+int Encoder;
+
+Ticker ReadEncoder;
+
+void Read(){
+
+    spi.format(9,2);            // Setup the spi for 9 bit data, high steady state clock,
+    spi.frequency(500000);  
+    cs = 0;                     // Select the device by seting chip select low  
+
+// Send a dummy byte to receive the contents encoder
+    int upper = spi.write(0x00);
+    int lower = spi.write(0x00);
+    lower = lower >> 6;   
+    upper = (upper << 6)+lower;
+    cs = 1;
+    
+    pc.printf("%d  \r", upper);   
+}
+
+
+int main() {
+    pc.printf("Hello World!\n");
+    ReadEncoder.attach_us(&Read, 100000); // call flip every 100 milli-seconds
+    
+    while(1) {
+    }
+}
+