Diff: main.cpp

Revision:

1:d1403e3aa88b

Parent:

0:466ad3f38b6b

Child:

2:853d24908e9f

--- a/main.cpp	Tue Feb 12 17:25:49 2013 +0000
+++ b/main.cpp	Thu Nov 19 17:07:34 2015 +0000
@@ -1,27 +1,64 @@
 #include "mbed.h"
+/************************************************************
+*   Very quick test program to test LPC1768 interface to 
+*   25AA080A Microchip SPI 8k EEPROM 
+*
+*   Note: nothing fancy
+*
+************************************************************/
+Serial pc(USBTX, USBRX); // tx, rx
  
 SPI spi(p5, p6, p7); // mosi, miso, sclk
 DigitalOut cs(p8);
  
 int main() {
+    uint8_t ret_val = 0;
+
     // Chip must be deselected
     cs = 1;
 
-    // Setup the spi for 8 bit data, high steady state clock,
     // second edge capture, with a 1MHz clock rate
-    spi.format(8,3);
+    spi.format(8,0);
     spi.frequency(1000000);
  
     // Select the device by seting chip select low
     cs = 0;
- 
-    // Send 0x8f, the command to read the WHOAMI register
-    spi.write(0x8F);
+    
+    /*write some known data to EEPROM 
+     * Set the WREN latch instruction first
+     */
+    spi.write(0x06);
+    cs = 1;
+    wait(0.001);
+    cs = 0;
+    spi.write(0x02); 
+    spi.write(0x00);
+    spi.write(0x01); //memory location 0x0001
+    
+    for (uint8_t i=0; i<15; i++)
+        {
+            spi.write(i);  //Can only write 16bytes in single write instruction
+            pc.printf("Writing = 0x%X \t %d\n\r", i, i);
+            wait(0.001);   //probably not be needed as is only writing to a buffer
+        }
+    cs = 1; // Must deselect for the write operation to complete
  
-    // Send a dummy byte to receive the contents of the WHOAMI register
-    int whoami = spi.write(0x00);
-    printf("WHOAMI register = 0x%X\n", whoami);
+    wait(2); //Need some delay between write and read
+    
+    cs = 0;
  
-    // Deselect the device
+    spi.write(0x03);
+    spi.write(0x00);
+    for (int i=0; i<32; i++)
+        {
+            ret_val = spi.write(0x01);
+            pc.printf("Reading = 0x%X \t %d\n\r", ret_val, ret_val);
+            wait(0.2);
+        }
+    
+        // Deselect the device
     cs = 1;
+    
+
+
 }
\ No newline at end of file