spi_ram.h

00001 #include "mbed.h"
00002 
00003 #ifndef  SPI_RAM_H
00004 #define  SPI_RAM_H
00005 
00006 // Mode codes
00007 #define BYTE_MODE       0x00
00008 #define SEQUENTIAL_MODE 0x40
00009 
00010 // Command codes
00011 #define READ            0x03
00012 #define WRITE           0x02
00013 #define READ_STATUS     0x05
00014 #define WRITE_STATUS    0x01
00015 
00016 // Underlying SPI constants
00017 #define TFE             0x02
00018 #define TNF             0x02
00019 #define RNE             0x04
00020 
00021 class SRAM {
00022 public:
00023 
00024     SRAM(SPI& spiDef, PinName csiPin);
00025 
00026     char readStatus();
00027     void writeStatus(char status);
00028     void startWriteSequence();
00029     void startReadSequence();
00030     void writeSequence0(char c);
00031     void writeSequence1(char c);
00032     char readSequence0();
00033     char readSequence1();
00034     void stopSequence();
00035 
00036 private:
00037     SPI& spi;
00038     DigitalOut csi;
00039     void prepareCommand(char command, int address);
00040     void select();
00041     void deselect();
00042 };
00043 
00044 #endif