Sonder Design Team / Memory25L16_fast

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Dependents:   BlackBoard_Firmware_Fast_read_not_test

Fork of Memory by Sonder Design Team

Memory.cpp@8:6af25b9563df, 2018-04-15 (annotated)

Committer:
ThomasSonderDesign
Date:
Sun Apr 15 23:19:56 2018 +0000
Revision:
8:6af25b9563df
Parent:
6:c11cb6709b8b
Child:
9:2587f246bf48
Small update made to speed up read time.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ThomasSonderDesign 0:c2e41d203cdb 1 #include "mbed.h"
ThomasSonderDesign 0:c2e41d203cdb 2 #include "Memory.h"
ThomasSonderDesign 0:c2e41d203cdb 3
ThomasSonderDesign 0:c2e41d203cdb 4
ThomasSonderDesign 0:c2e41d203cdb 5 Memory::Memory(PinName chipSelect) : _cs_mem(chipSelect)
ThomasSonderDesign 0:c2e41d203cdb 6 {
ThomasSonderDesign 0:c2e41d203cdb 7 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 8 }
ThomasSonderDesign 0:c2e41d203cdb 9 /**
ThomasSonderDesign 0:c2e41d203cdb 10 * Reads 'length' elements into a char array starting at the 24bit Address.
ThomasSonderDesign 0:c2e41d203cdb 11 *If length is greater than BufferSize (3840 bytes) the function will terminate
ThomasSonderDesign 0:c2e41d203cdb 12 *and return the start address.
ThomasSonderDesign 0:c2e41d203cdb 13 */
ThomasSonderDesign 8:6af25b9563df 14 int Memory::readData(SPI my_spi, short value [], int Address, int length)
ThomasSonderDesign 0:c2e41d203cdb 15 {
ThomasSonderDesign 8:6af25b9563df 16 //if(length>bufferSize) {
ThomasSonderDesign 8:6af25b9563df 17 //printf("\nLength %i exceeds Max Length\n",length);
ThomasSonderDesign 8:6af25b9563df 18 //return Address;
ThomasSonderDesign 8:6af25b9563df 19 //}
ThomasSonderDesign 8:6af25b9563df 20 int temp = 0;
ThomasSonderDesign 8:6af25b9563df 21 int temp1 = 0;
ThomasSonderDesign 8:6af25b9563df 22 int temp2 =0;
ThomasSonderDesign 0:c2e41d203cdb 23 _cs_mem = 1; //Ensure cs is deselected
ThomasSonderDesign 0:c2e41d203cdb 24 wait_us(10);
ThomasSonderDesign 0:c2e41d203cdb 25 _cs_mem = 0; //memory is selected
ThomasSonderDesign 0:c2e41d203cdb 26 my_spi.write(0x03); //Send read command
ThomasSonderDesign 0:c2e41d203cdb 27 my_spi.write(Address>>16); //Send high address byte
ThomasSonderDesign 0:c2e41d203cdb 28 my_spi.write(Address>>8); //Send mid address byte
ThomasSonderDesign 0:c2e41d203cdb 29 my_spi.write(Address); //Send low address byte
ThomasSonderDesign 0:c2e41d203cdb 30
ThomasSonderDesign 0:c2e41d203cdb 31
ThomasSonderDesign 0:c2e41d203cdb 32 for(int i =0; i <length; i++) {
ThomasSonderDesign 8:6af25b9563df 33 temp = my_spi.write(dummy);//Send dummy byte to read out value ate Address
ThomasSonderDesign 8:6af25b9563df 34 value[i]= (temp);
ThomasSonderDesign 8:6af25b9563df 35 //printf(" %X",value[i]);
ThomasSonderDesign 0:c2e41d203cdb 36 Address++;
ThomasSonderDesign 0:c2e41d203cdb 37 }
ThomasSonderDesign 0:c2e41d203cdb 38 _cs_mem = 1;
ThomasSonderDesign 0:c2e41d203cdb 39 return Address; //Return the address of the next unread byte
ThomasSonderDesign 0:c2e41d203cdb 40 }
ThomasSonderDesign 0:c2e41d203cdb 41
ThomasSonderDesign 0:c2e41d203cdb 42
ThomasSonderDesign 0:c2e41d203cdb 43 /**
ThomasSonderDesign 0:c2e41d203cdb 44 * Sector Erase, erases everything in the 4KB sector that includes Address
ThomasSonderDesign 0:c2e41d203cdb 45 */
ThomasSonderDesign 0:c2e41d203cdb 46 void Memory::sectorErase(SPI my_spi, long Address)
ThomasSonderDesign 0:c2e41d203cdb 47 {
ThomasSonderDesign 0:c2e41d203cdb 48 _cs_mem = 1;
ThomasSonderDesign 0:c2e41d203cdb 49 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 50 my_spi.write(0x06); //Send Write enable command
ThomasSonderDesign 0:c2e41d203cdb 51 _cs_mem= 1;
ThomasSonderDesign 0:c2e41d203cdb 52 wait_us(5);
ThomasSonderDesign 0:c2e41d203cdb 53 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 54 my_spi.write(0x20); //Send sector erase comand
ThomasSonderDesign 0:c2e41d203cdb 55 my_spi.write(Address>>16); //Send high address byte
ThomasSonderDesign 0:c2e41d203cdb 56 my_spi.write(Address>>8); //Send mid address byte
ThomasSonderDesign 0:c2e41d203cdb 57 my_spi.write(Address); //Send low address byte
ThomasSonderDesign 0:c2e41d203cdb 58 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 59 wait_us(5);
ThomasSonderDesign 0:c2e41d203cdb 60
ThomasSonderDesign 0:c2e41d203cdb 61 //Pol the status register untill the Write In Progress bit is no longer set
ThomasSonderDesign 0:c2e41d203cdb 62 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 63 my_spi.write(05);
ThomasSonderDesign 0:c2e41d203cdb 64 int byte1 = my_spi.write(dummy);
ThomasSonderDesign 0:c2e41d203cdb 65 while(byte1>0) {
ThomasSonderDesign 0:c2e41d203cdb 66 byte1 = my_spi.write(dummy);
ThomasSonderDesign 0:c2e41d203cdb 67 }
ThomasSonderDesign 0:c2e41d203cdb 68 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 69 }
ThomasSonderDesign 0:c2e41d203cdb 70
ThomasSonderDesign 0:c2e41d203cdb 71
ThomasSonderDesign 0:c2e41d203cdb 72 /**
ThomasSonderDesign 0:c2e41d203cdb 73 * Block Erase, erases everything in a 4KB block that includes Address
ThomasSonderDesign 0:c2e41d203cdb 74 */
ThomasSonderDesign 2:5c70c0334ed0 75 int Memory::blockErase(SPI my_spi, int Address)
ThomasSonderDesign 0:c2e41d203cdb 76 {
ThomasSonderDesign 0:c2e41d203cdb 77 _cs_mem = 1;
ThomasSonderDesign 0:c2e41d203cdb 78 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 79 my_spi.write(0x06); //Send Write enable command
ThomasSonderDesign 0:c2e41d203cdb 80 _cs_mem= 1;
ThomasSonderDesign 0:c2e41d203cdb 81 wait_us(5);
ThomasSonderDesign 0:c2e41d203cdb 82 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 83 my_spi.write(0xD8); //Send sector erase comand
ThomasSonderDesign 0:c2e41d203cdb 84 my_spi.write((Address>>16)&0xff); //Send high address byte
ThomasSonderDesign 0:c2e41d203cdb 85 my_spi.write((Address>>8)&0xff); //Send mid address byte
ThomasSonderDesign 0:c2e41d203cdb 86 my_spi.write((Address)&0xff); //Send low address byte
ThomasSonderDesign 0:c2e41d203cdb 87 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 88 wait_us(5);
ThomasSonderDesign 0:c2e41d203cdb 89
ThomasSonderDesign 0:c2e41d203cdb 90 //Pol the status register untill the Write In Progress bit is no longer set
ThomasSonderDesign 0:c2e41d203cdb 91 _cs_mem=0;
ThomasSonderDesign 0:c2e41d203cdb 92 my_spi.write(05);
ThomasSonderDesign 0:c2e41d203cdb 93 int byte1 = my_spi.write(dummy);
ThomasSonderDesign 0:c2e41d203cdb 94 while(byte1>0) {
ThomasSonderDesign 0:c2e41d203cdb 95 byte1 = my_spi.write(dummy);
ThomasSonderDesign 0:c2e41d203cdb 96 }
ThomasSonderDesign 0:c2e41d203cdb 97 _cs_mem=1;
ThomasSonderDesign 2:5c70c0334ed0 98 int returnVal = (Address/0x10000);
ThomasSonderDesign 2:5c70c0334ed0 99 returnVal*=0x10000;
ThomasSonderDesign 2:5c70c0334ed0 100 returnVal+=0x10000;
ThomasSonderDesign 2:5c70c0334ed0 101 return returnVal;
ThomasSonderDesign 0:c2e41d203cdb 102 }
ThomasSonderDesign 0:c2e41d203cdb 103
ThomasSonderDesign 0:c2e41d203cdb 104 /**
ThomasSonderDesign 0:c2e41d203cdb 105 * Writes a char array containg 'length' elements to memory sarting at address.
ThomasSonderDesign 0:c2e41d203cdb 106 *If length is greater than BufferSize (3840 bytes) the function will terminate
ThomasSonderDesign 0:c2e41d203cdb 107 *and return the start address.
ThomasSonderDesign 0:c2e41d203cdb 108 */
ThomasSonderDesign 0:c2e41d203cdb 109 int Memory::writeData(SPI my_spi, char buffer[], int address, int length)
ThomasSonderDesign 0:c2e41d203cdb 110 {
ThomasSonderDesign 0:c2e41d203cdb 111 if(length>bufferSize) {
ThomasSonderDesign 0:c2e41d203cdb 112 printf("\nLength %i exceeds Max Length\n",length);
ThomasSonderDesign 0:c2e41d203cdb 113 return address;
ThomasSonderDesign 0:c2e41d203cdb 114 }
ThomasSonderDesign 0:c2e41d203cdb 115 for(int i =0; i<length; i++) {
ThomasSonderDesign 0:c2e41d203cdb 116 if(address%256==0) { //Handle start and end of pages
ThomasSonderDesign 0:c2e41d203cdb 117 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 118 wait_us(10);
ThomasSonderDesign 0:c2e41d203cdb 119 //wait for the WIP bit to go low
ThomasSonderDesign 0:c2e41d203cdb 120 _cs_mem=0; //Selet memory
ThomasSonderDesign 0:c2e41d203cdb 121 my_spi.write(0x05); //Send read status register command
ThomasSonderDesign 0:c2e41d203cdb 122 int byte1 = my_spi.write(dummy);//Send dummy byte to read status reg
ThomasSonderDesign 0:c2e41d203cdb 123 while ((byte1&1)>0) {
ThomasSonderDesign 0:c2e41d203cdb 124 wait_us(10);
ThomasSonderDesign 0:c2e41d203cdb 125 my_spi.write(0x05); //Send read status register command
ThomasSonderDesign 0:c2e41d203cdb 126 byte1 = my_spi.write(dummy);//Send dummy byte to read status reg
ThomasSonderDesign 0:c2e41d203cdb 127 }
ThomasSonderDesign 0:c2e41d203cdb 128 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 129
ThomasSonderDesign 0:c2e41d203cdb 130 _cs_mem=0; //Selet memory
ThomasSonderDesign 0:c2e41d203cdb 131 my_spi.write(06); //Set Write Enable flag in the status reg
ThomasSonderDesign 0:c2e41d203cdb 132 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 133 wait_us(10);
ThomasSonderDesign 0:c2e41d203cdb 134
ThomasSonderDesign 0:c2e41d203cdb 135 _cs_mem=0; //Selet memory
ThomasSonderDesign 0:c2e41d203cdb 136 my_spi.write(02); //Send read comand
ThomasSonderDesign 0:c2e41d203cdb 137 my_spi.write(address>>16); //Send high address byte
ThomasSonderDesign 0:c2e41d203cdb 138 my_spi.write(address>>8); //Send middle adress byte
ThomasSonderDesign 0:c2e41d203cdb 139 my_spi.write(address); //Send low address
ThomasSonderDesign 0:c2e41d203cdb 140
ThomasSonderDesign 0:c2e41d203cdb 141 }
ThomasSonderDesign 0:c2e41d203cdb 142 my_spi.write(buffer[i]); //Write the calue of the buffer to memory
ThomasSonderDesign 6:c11cb6709b8b 143 //printf("%i%i%i%i%i%i%i%i",sixtyBytes[i]>>7&&1,buffer[i]>>6&&1,buffer[i]>>5&&1,buffer[i]>>4&&1,buffer[i]>>3&&1,buffer[i]>>2&&1,buffer[i]>>1&&1,buffer[i]&&1);
ThomasSonderDesign 6:c11cb6709b8b 144
ThomasSonderDesign 0:c2e41d203cdb 145 wait_us(5);
ThomasSonderDesign 0:c2e41d203cdb 146 address=address++; //Increment address
ThomasSonderDesign 0:c2e41d203cdb 147 }
ThomasSonderDesign 0:c2e41d203cdb 148 _cs_mem=1;
ThomasSonderDesign 0:c2e41d203cdb 149 return address;
ThomasSonderDesign 0:c2e41d203cdb 150 }
ThomasSonderDesign 0:c2e41d203cdb 151
ThomasSonderDesign 8:6af25b9563df 152