Diff: main.cpp

Revision:

0:696194ed3c66

diff -r 000000000000 -r 696194ed3c66 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 05 19:06:02 2016 +0000
@@ -0,0 +1,64 @@
+/*
+  Hotboards eeprom Library - write_byte
+ Demonstrates the use a spi eeprom. The Hotboards_eeprom
+ library works with all Microchip 25xxx serial memory series 
+ like the one presented eeprom board (http://www.hotboards.org).
+ This sketch read a single byte into a variable, then, the variable is added by two,
+ the result is written into memory. Finally, byte is readed again.
+ the values are printed to serial port too.
+ 
+ The circuit:
+ *  VDD   -->  3.3v
+ *  SO    -->  PB_14
+ *  SI    -->  PB_15
+ *  SCK   -->  PB_13
+ *  CS    -->  PC_4
+ *  GND   -->  GND
+ 
+ Library  created by Diego from Hotboards
+ example added by Pedro from Hotboards
+ */
+ 
+#include "mbed.h"
+#include "Hotboards_eeprom.h"
+
+/*Open an instance of serial port*/
+Serial pc(USBTX,USBRX);
+/* initialize an instance of SPI bus,setting the SPI pins*/
+SPI device(PB_15,PB_14,PB_13); /* SO, SI, SCK*/  
+/*initialize the library with the numbers of the interface pins*/
+Hotboards_eeprom eeprom(device,PC_4,HT_EEPROM25xx_32Kb); /* (spi,Cs,Density) */
+
+int main() 
+{
+    /*SPI transfer at 8 bits, MODE = 3*/
+    device.format(8,3);
+    /* set the spi frequency to 5MHz  */
+    device.frequency(5000000);
+    /*initialize CS pin*/
+    eeprom.init();
+    
+    /* variable to read data*/
+    char Data;
+    
+    /* read firts byte*/
+    Data=eeprom.read(0);
+    /* send to serial port*/
+    printf("%X \n",Data); 
+    
+    /* readed data is added by two */
+    Data+= 2;
+    /* write the result*/
+    eeprom.write(0,Data);
+    
+    /* read firts byte again*/
+    Data=eeprom.read(0);
+    /* send to serial port */
+    printf("%X \n",Data); 
+    
+    while(1)
+    {
+        /*loop*/
+    }
+    
+}
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