23LCV1024.cpp

00001 #include "mbed.h"
00002 #include "23LCV1024.h"
00003 
00004 SRAM23LCV1024::SRAM23LCV1024(SPI& spi, PinName cs) : _spi(spi), _cs(cs) {
00005     _cs = 1;    // Deselect the device so that it can initialize
00006 }
00007     
00008 int SRAM23LCV1024::getReadMode() {
00009     /* The mode bits indicate the operating mode of the SRAM:
00010         00 = Byte mode
00011         10 = Page mode
00012         01 = Sequential mode (default)
00013         11 = Reserved
00014     */
00015     
00016     _cs = 0;
00017     _spi.write(CMD_RDMR);
00018     int ram_mode =  _spi.write(0)>>6;
00019     _cs = 1;
00020 
00021     return ram_mode;
00022 }
00023         
00024 int SRAM23LCV1024::readBytes(int address, char* buffer, int length) {   
00025     int i;
00026  
00027     _cs = 0;
00028     _spi.write(CMD_READ);
00029     _spi.write((address >> 16) & 0xff);
00030     _spi.write((address >> 8) & 0xff);
00031     _spi.write(address & 0xff);
00032  
00033     for (i = 0; i < length; i ++) buffer[i] = _spi.write(0);
00034 
00035     _cs = 1;
00036     return 0;
00037 }
00038         
00039         
00040 int SRAM23LCV1024::writeBytes(int address, char* buffer, int length) {
00041     int i;
00042  
00043     _cs = 0;
00044     _spi.write(CMD_WRITE);
00045     _spi.write((address >> 16) & 0xff);
00046     _spi.write((address >> 8) & 0xff);
00047     _spi.write(address & 0xff);
00048  
00049     for (i = 0; i < length; i ++) _spi.write(buffer[i]);
00050 
00051     _cs = 1;
00052     return 0;
00053 }
00054