Hotboards MX / Mbed 2 deprecated Hotboards_eeprom_write_byte

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.

Dependencies:   Hotboards_eeprom mbed

main.cpp@0:696194ed3c66, 2016-02-05 (annotated)

Committer:
Hotboards
Date:
Fri Feb 05 19:06:02 2016 +0000
Revision:
0:696194ed3c66
first release: eeprom write_byte

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Hotboards 0:696194ed3c66 1 /*
Hotboards 0:696194ed3c66 2 Hotboards eeprom Library - write_byte
Hotboards 0:696194ed3c66 3 Demonstrates the use a spi eeprom. The Hotboards_eeprom
Hotboards 0:696194ed3c66 4 library works with all Microchip 25xxx serial memory series
Hotboards 0:696194ed3c66 5 like the one presented eeprom board (http://www.hotboards.org).
Hotboards 0:696194ed3c66 6 This sketch read a single byte into a variable, then, the variable is added by two,
Hotboards 0:696194ed3c66 7 the result is written into memory. Finally, byte is readed again.
Hotboards 0:696194ed3c66 8 the values are printed to serial port too.
Hotboards 0:696194ed3c66 9
Hotboards 0:696194ed3c66 10 The circuit:
Hotboards 0:696194ed3c66 11 * VDD --> 3.3v
Hotboards 0:696194ed3c66 12 * SO --> PB_14
Hotboards 0:696194ed3c66 13 * SI --> PB_15
Hotboards 0:696194ed3c66 14 * SCK --> PB_13
Hotboards 0:696194ed3c66 15 * CS --> PC_4
Hotboards 0:696194ed3c66 16 * GND --> GND
Hotboards 0:696194ed3c66 17
Hotboards 0:696194ed3c66 18 Library created by Diego from Hotboards
Hotboards 0:696194ed3c66 19 example added by Pedro from Hotboards
Hotboards 0:696194ed3c66 20 */
Hotboards 0:696194ed3c66 21
Hotboards 0:696194ed3c66 22 #include "mbed.h"
Hotboards 0:696194ed3c66 23 #include "Hotboards_eeprom.h"
Hotboards 0:696194ed3c66 24
Hotboards 0:696194ed3c66 25 /*Open an instance of serial port*/
Hotboards 0:696194ed3c66 26 Serial pc(USBTX,USBRX);
Hotboards 0:696194ed3c66 27 /* initialize an instance of SPI bus,setting the SPI pins*/
Hotboards 0:696194ed3c66 28 SPI device(PB_15,PB_14,PB_13); /* SO, SI, SCK*/
Hotboards 0:696194ed3c66 29 /*initialize the library with the numbers of the interface pins*/
Hotboards 0:696194ed3c66 30 Hotboards_eeprom eeprom(device,PC_4,HT_EEPROM25xx_32Kb); /* (spi,Cs,Density) */
Hotboards 0:696194ed3c66 31
Hotboards 0:696194ed3c66 32 int main()
Hotboards 0:696194ed3c66 33 {
Hotboards 0:696194ed3c66 34 /*SPI transfer at 8 bits, MODE = 3*/
Hotboards 0:696194ed3c66 35 device.format(8,3);
Hotboards 0:696194ed3c66 36 /* set the spi frequency to 5MHz */
Hotboards 0:696194ed3c66 37 device.frequency(5000000);
Hotboards 0:696194ed3c66 38 /*initialize CS pin*/
Hotboards 0:696194ed3c66 39 eeprom.init();
Hotboards 0:696194ed3c66 40
Hotboards 0:696194ed3c66 41 /* variable to read data*/
Hotboards 0:696194ed3c66 42 char Data;
Hotboards 0:696194ed3c66 43
Hotboards 0:696194ed3c66 44 /* read firts byte*/
Hotboards 0:696194ed3c66 45 Data=eeprom.read(0);
Hotboards 0:696194ed3c66 46 /* send to serial port*/
Hotboards 0:696194ed3c66 47 printf("%X \n",Data);
Hotboards 0:696194ed3c66 48
Hotboards 0:696194ed3c66 49 /* readed data is added by two */
Hotboards 0:696194ed3c66 50 Data+= 2;
Hotboards 0:696194ed3c66 51 /* write the result*/
Hotboards 0:696194ed3c66 52 eeprom.write(0,Data);
Hotboards 0:696194ed3c66 53
Hotboards 0:696194ed3c66 54 /* read firts byte again*/
Hotboards 0:696194ed3c66 55 Data=eeprom.read(0);
Hotboards 0:696194ed3c66 56 /* send to serial port */
Hotboards 0:696194ed3c66 57 printf("%X \n",Data);
Hotboards 0:696194ed3c66 58
Hotboards 0:696194ed3c66 59 while(1)
Hotboards 0:696194ed3c66 60 {
Hotboards 0:696194ed3c66 61 /*loop*/
Hotboards 0:696194ed3c66 62 }
Hotboards 0:696194ed3c66 63
Hotboards 0:696194ed3c66 64 }