Diff: main.cpp

Revision:

0:2a57c6fe6af8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Mar 10 00:23:03 2010 +0000
@@ -0,0 +1,51 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+
+Serial pc (USBTX,USBRX);
+
+SPI spi (p5,p6,p7);
+DigitalOut cs (p8);
+
+int main() {
+
+    spi.format(8,2);
+
+    // set initial state of CS pin
+    cs = 0;
+    wait (0.1);    
+    
+// start by clearing WP in Control register
+// the RAM can not be accessed until WP is clear
+    
+    cs = 1;
+    wait (0.1);    
+    spi.write (0x8f); // write to control register
+    spi.write(0x0); // clear all the bits
+    cs = 0;
+    
+    wait (0.1);
+    
+// Now write to the RAM
+    cs = 1;
+    wait (0.1);    
+    spi.write (0xA0); // write to first RAM location
+    spi.write(0xa5);  // set a pattern
+    cs = 0;
+
+    wait (0.1);
+
+// Now read from RAM
+    cs = 1;
+    wait (0.1);    
+    spi.write (0x20); // read from first RAM location
+    char data = spi.write(0x00); 
+    cs = 0;
+
+
+    printf("Read from location 0x20 and received 0x%X\n",data);
+
+
+    while (1) {}
+
+}