Jack Berkhout / FRAMSPI

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Dependents:   20180621_FT813

FRAMSPI.cpp@0:0411eff88bac, 2018-07-23 (annotated)

Committer:
JackB
Date:
Mon Jul 23 12:23:33 2018 +0000
Revision:
0:0411eff88bac
FRAM

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JackB 0:0411eff88bac 1 /* FRAMSPI - Ramtron FRAM FM24VXX series driver
JackB 0:0411eff88bac 2 * Copyright (c) 2012 Oleg Evsegneev
JackB 0:0411eff88bac 3 * Released under the MIT License: http://mbed.org/license/mit
JackB 0:0411eff88bac 4 *
JackB 0:0411eff88bac 5 * Datasheet http://www.ramtron.com/files/datasheets/FM25V02_ds.pdf
JackB 0:0411eff88bac 6 */
JackB 0:0411eff88bac 7
JackB 0:0411eff88bac 8 #include "mbed.h"
JackB 0:0411eff88bac 9 #include "FRAMSPI.h"
JackB 0:0411eff88bac 10
JackB 0:0411eff88bac 11 FRAMSPI::FRAMSPI(SPI& spi, PinName ncs) : _spi(spi), _ncs(ncs) {
JackB 0:0411eff88bac 12 deselect();
JackB 0:0411eff88bac 13 }
JackB 0:0411eff88bac 14
JackB 0:0411eff88bac 15 void FRAMSPI::select() {
JackB 0:0411eff88bac 16 _ncs = 0;
JackB 0:0411eff88bac 17 }
JackB 0:0411eff88bac 18
JackB 0:0411eff88bac 19 void FRAMSPI::deselect() {
JackB 0:0411eff88bac 20 _ncs = 1;
JackB 0:0411eff88bac 21 }
JackB 0:0411eff88bac 22
JackB 0:0411eff88bac 23 void FRAMSPI::readID( char *buff ) {
JackB 0:0411eff88bac 24 select();
JackB 0:0411eff88bac 25 _spi.write(READ_SN);
JackB 0:0411eff88bac 26 for( int i=0; i<8; i++ )
JackB 0:0411eff88bac 27 buff[i] = (char) _spi.write(0);
JackB 0:0411eff88bac 28 deselect();
JackB 0:0411eff88bac 29 }
JackB 0:0411eff88bac 30
JackB 0:0411eff88bac 31 void FRAMSPI::readSN( char *buff ) {
JackB 0:0411eff88bac 32 select();
JackB 0:0411eff88bac 33 _spi.write(READ_SN);
JackB 0:0411eff88bac 34 for( int i=0; i<2; i++ )
JackB 0:0411eff88bac 35 buff[i] = (char) _spi.write(0);
JackB 0:0411eff88bac 36 deselect();
JackB 0:0411eff88bac 37 }
JackB 0:0411eff88bac 38
JackB 0:0411eff88bac 39 void FRAMSPI::prepareCommand(char cmd, int addr) {
JackB 0:0411eff88bac 40 if( cmd == WRITE ){
JackB 0:0411eff88bac 41 select();
JackB 0:0411eff88bac 42 _spi.write(WRITE_ENABLED);
JackB 0:0411eff88bac 43 deselect();
JackB 0:0411eff88bac 44 }
JackB 0:0411eff88bac 45 select();
JackB 0:0411eff88bac 46 _spi.write(cmd);
JackB 0:0411eff88bac 47 _spi.write(addr >> 8);
JackB 0:0411eff88bac 48 _spi.write(addr & 0xFF);
JackB 0:0411eff88bac 49 }
JackB 0:0411eff88bac 50
JackB 0:0411eff88bac 51 // write
JackB 0:0411eff88bac 52 void FRAMSPI::write(int addr, char byte) {
JackB 0:0411eff88bac 53 prepareCommand(WRITE, addr);
JackB 0:0411eff88bac 54 _spi.write(byte);
JackB 0:0411eff88bac 55 deselect();
JackB 0:0411eff88bac 56 }
JackB 0:0411eff88bac 57
JackB 0:0411eff88bac 58 void FRAMSPI::write(int addr, char *buff, int cnt) {
JackB 0:0411eff88bac 59 prepareCommand(WRITE, addr);
JackB 0:0411eff88bac 60 for (int i = 0; i < cnt; i++) {
JackB 0:0411eff88bac 61 _spi.write(buff[i]);
JackB 0:0411eff88bac 62 }
JackB 0:0411eff88bac 63 deselect();
JackB 0:0411eff88bac 64 }
JackB 0:0411eff88bac 65
JackB 0:0411eff88bac 66 // read
JackB 0:0411eff88bac 67 char FRAMSPI::read(int addr) {
JackB 0:0411eff88bac 68 char res;
JackB 0:0411eff88bac 69 prepareCommand(READ, addr);
JackB 0:0411eff88bac 70 res = _spi.write(0);
JackB 0:0411eff88bac 71 deselect();
JackB 0:0411eff88bac 72 return res;
JackB 0:0411eff88bac 73 }
JackB 0:0411eff88bac 74
JackB 0:0411eff88bac 75 void FRAMSPI::read(int addr, char * buff, int cnt) {
JackB 0:0411eff88bac 76 prepareCommand(READ, addr);
JackB 0:0411eff88bac 77 for (int i = 0; i < cnt; i++) {
JackB 0:0411eff88bac 78 buff[i] = _spi.write(0);
JackB 0:0411eff88bac 79 }
JackB 0:0411eff88bac 80 deselect();
JackB 0:0411eff88bac 81 }