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313 lines
8.8 KiB
313 lines
8.8 KiB
/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- |
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/* |
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DataFlash_APM1.cpp - DataFlash log library for AT45DB161 |
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Code by Jordi Munoz and Jose Julio. DIYDrones.com |
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This code works with boards based on ATMega168/328 and ATMega1280/2560 using SPI port |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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Dataflash library for AT45DB161D flash memory |
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Memory organization : 4096 pages of 512 bytes or 528 bytes |
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Maximun write bandwidth : 512 bytes in 14ms |
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This code is written so the master never has to wait to write the data on the eeprom |
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Methods: |
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Init() : Library initialization (SPI initialization) |
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StartWrite(page) : Start a write session. page=start page. |
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WriteByte(data) : Write a byte |
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WriteInt(data) : Write an integer (2 bytes) |
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WriteLong(data) : Write a long (4 bytes) |
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StartRead(page) : Start a read on (page) |
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GetWritePage() : Returns the last page written to |
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GetPage() : Returns the last page read |
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ReadByte() |
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ReadInt() |
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ReadLong() |
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Properties: |
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*/ |
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#include <stdint.h> |
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#include "DataFlash.h" |
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#include <SPI.h> |
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// flash size |
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#define DF_LAST_PAGE 4096 |
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// arduino mega SPI pins |
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) |
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#define DF_DATAOUT 51 // MOSI |
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#define DF_DATAIN 50 // MISO |
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#define DF_SPICLOCK 52 // SCK |
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#define DF_SLAVESELECT 53 // SS (PB0) |
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#define DF_RESET 31 // RESET (PC6) |
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#else // normal arduino SPI pins... |
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#define DF_DATAOUT 11 //MOSI |
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#define DF_DATAIN 12 //MISO |
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#define DF_SPICLOCK 13 //SCK |
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#define DF_SLAVESELECT 10 //SS |
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#endif |
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// AT45DB161D Commands (from Datasheet) |
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#define DF_TRANSFER_PAGE_TO_BUFFER_1 0x53 |
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#define DF_TRANSFER_PAGE_TO_BUFFER_2 0x55 |
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#define DF_STATUS_REGISTER_READ 0xD7 |
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#define DF_READ_MANUFACTURER_AND_DEVICE_ID 0x9F |
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#define DF_PAGE_READ 0xD2 |
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#define DF_BUFFER_1_READ 0xD4 |
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#define DF_BUFFER_2_READ 0xD6 |
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#define DF_BUFFER_1_WRITE 0x84 |
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#define DF_BUFFER_2_WRITE 0x87 |
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#define DF_BUFFER_1_TO_PAGE_WITH_ERASE 0x83 |
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#define DF_BUFFER_2_TO_PAGE_WITH_ERASE 0x86 |
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#define DF_PAGE_ERASE 0x81 |
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#define DF_BLOCK_ERASE 0x50 |
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#define DF_SECTOR_ERASE 0x7C |
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#define DF_CHIP_ERASE_0 0xC7 |
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#define DF_CHIP_ERASE_1 0x94 |
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#define DF_CHIP_ERASE_2 0x80 |
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#define DF_CHIP_ERASE_3 0x9A |
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// *** INTERNAL FUNCTIONS *** |
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void dataflash_CS_inactive() |
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{ |
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digitalWrite(DF_SLAVESELECT,HIGH); //disable device |
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} |
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void dataflash_CS_active() |
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{ |
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digitalWrite(DF_SLAVESELECT,LOW); //enable device |
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} |
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// Constructors //////////////////////////////////////////////////////////////// |
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DataFlash_APM1::DataFlash_APM1() |
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{ |
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} |
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// Public Methods ////////////////////////////////////////////////////////////// |
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void DataFlash_APM1::Init(void) |
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{ |
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pinMode(DF_DATAOUT, OUTPUT); |
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pinMode(DF_DATAIN, INPUT); |
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pinMode(DF_SPICLOCK,OUTPUT); |
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pinMode(DF_SLAVESELECT,OUTPUT); |
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) |
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pinMode(DF_RESET,OUTPUT); |
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// Reset the chip |
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digitalWrite(DF_RESET,LOW); |
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delay(1); |
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digitalWrite(DF_RESET,HIGH); |
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#endif |
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dataflash_CS_inactive(); //disable device |
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// Setup SPI Master, Mode 3, fosc/4 = 4MHz |
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SPI.begin(); |
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SPI.setBitOrder(MSBFIRST); |
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SPI.setDataMode(SPI_MODE3); |
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SPI.setClockDivider(SPI_CLOCK_DIV2); |
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// get page size: 512 or 528 |
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df_PageSize=PageSize(); |
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// the last page is reserved for config information |
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df_NumPages = DF_LAST_PAGE - 1; |
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} |
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// This function is mainly to test the device |
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void DataFlash_APM1::ReadManufacturerID() |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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// Read manufacturer and ID command... |
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SPI.transfer(DF_READ_MANUFACTURER_AND_DEVICE_ID); |
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df_manufacturer = SPI.transfer(0xff); |
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df_device = SPI.transfer(0xff); |
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df_device = (df_device<<8) | SPI.transfer(0xff); |
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SPI.transfer(0xff); |
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dataflash_CS_inactive(); // Reset dataflash command decoder |
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} |
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bool DataFlash_APM1::CardInserted(void) |
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{ |
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return true; |
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} |
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// Read the status register |
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byte DataFlash_APM1::ReadStatusReg() |
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{ |
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byte tmp; |
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dataflash_CS_active(); // activate dataflash command decoder |
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// Read status command |
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SPI.transfer(DF_STATUS_REGISTER_READ); |
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tmp = SPI.transfer(0x00); // We only want to extract the READY/BUSY bit |
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dataflash_CS_inactive(); // Reset dataflash command decoder |
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return tmp; |
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} |
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// Read the status of the DataFlash |
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inline |
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byte DataFlash_APM1::ReadStatus() |
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{ |
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return(ReadStatusReg()&0x80); // We only want to extract the READY/BUSY bit |
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} |
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inline |
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uint16_t DataFlash_APM1::PageSize() |
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{ |
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return(528-((ReadStatusReg()&0x01)<<4)); // if first bit 1 trhen 512 else 528 bytes |
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} |
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// Wait until DataFlash is in ready state... |
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void DataFlash_APM1::WaitReady() |
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{ |
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while(!ReadStatus()); |
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} |
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void DataFlash_APM1::PageToBuffer(unsigned char BufferNum, uint16_t PageAdr) |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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if (BufferNum==1) |
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SPI.transfer(DF_TRANSFER_PAGE_TO_BUFFER_1); |
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else |
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SPI.transfer(DF_TRANSFER_PAGE_TO_BUFFER_2); |
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if(df_PageSize==512){ |
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SPI.transfer((unsigned char)(PageAdr >> 7)); |
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SPI.transfer((unsigned char)(PageAdr << 1)); |
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}else{ |
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SPI.transfer((unsigned char)(PageAdr >> 6)); |
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SPI.transfer((unsigned char)(PageAdr << 2)); |
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} |
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SPI.transfer(0x00); // don´t care bytes |
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dataflash_CS_inactive(); //initiate the transfer |
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dataflash_CS_active(); |
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while(!ReadStatus()); //monitor the status register, wait until busy-flag is high |
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dataflash_CS_inactive(); |
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} |
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void DataFlash_APM1::BufferToPage (unsigned char BufferNum, uint16_t PageAdr, unsigned char wait) |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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if (BufferNum==1) |
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SPI.transfer(DF_BUFFER_1_TO_PAGE_WITH_ERASE); |
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else |
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SPI.transfer(DF_BUFFER_2_TO_PAGE_WITH_ERASE); |
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if(df_PageSize==512){ |
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SPI.transfer((unsigned char)(PageAdr >> 7)); |
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SPI.transfer((unsigned char)(PageAdr << 1)); |
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}else{ |
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SPI.transfer((unsigned char)(PageAdr >> 6)); |
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SPI.transfer((unsigned char)(PageAdr << 2)); |
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} |
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SPI.transfer(0x00); // don´t care bytes |
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dataflash_CS_inactive(); //initiate the transfer |
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dataflash_CS_active(); |
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// Check if we need to wait to write the buffer to memory or we can continue... |
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if (wait) |
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while(!ReadStatus()); //monitor the status register, wait until busy-flag is high |
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dataflash_CS_inactive(); //deactivate dataflash command decoder |
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} |
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void DataFlash_APM1::BufferWrite (unsigned char BufferNum, uint16_t IntPageAdr, unsigned char Data) |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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if (BufferNum==1) |
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SPI.transfer(DF_BUFFER_1_WRITE); |
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else |
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SPI.transfer(DF_BUFFER_2_WRITE); |
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SPI.transfer(0x00); //don't cares |
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SPI.transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address |
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SPI.transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address |
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SPI.transfer(Data); //write data byte |
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dataflash_CS_inactive(); // disable dataflash command decoder |
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} |
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unsigned char DataFlash_APM1::BufferRead (unsigned char BufferNum, uint16_t IntPageAdr) |
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{ |
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byte tmp; |
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dataflash_CS_active(); // activate dataflash command decoder |
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if (BufferNum==1) |
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SPI.transfer(DF_BUFFER_1_READ); |
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else |
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SPI.transfer(DF_BUFFER_2_READ); |
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SPI.transfer(0x00); //don't cares |
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SPI.transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address |
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SPI.transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address |
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SPI.transfer(0x00); //don't cares |
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tmp = SPI.transfer(0x00); //read data byte |
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dataflash_CS_inactive(); // deactivate dataflash command decoder |
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return (tmp); |
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} |
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// *** END OF INTERNAL FUNCTIONS *** |
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void DataFlash_APM1::PageErase (uint16_t PageAdr) |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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SPI.transfer(DF_PAGE_ERASE); // Command |
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if(df_PageSize==512){ |
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SPI.transfer((unsigned char)(PageAdr >> 7)); |
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SPI.transfer((unsigned char)(PageAdr << 1)); |
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}else{ |
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SPI.transfer((unsigned char)(PageAdr >> 6)); |
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SPI.transfer((unsigned char)(PageAdr << 2)); |
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} |
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SPI.transfer(0x00); // "dont cares" |
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dataflash_CS_inactive(); //initiate flash page erase |
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dataflash_CS_active(); |
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while(!ReadStatus()); |
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dataflash_CS_inactive(); // deactivate dataflash command decoder |
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} |
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void DataFlash_APM1::ChipErase () |
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{ |
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dataflash_CS_active(); // activate dataflash command decoder |
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// opcodes for chip erase |
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SPI.transfer(DF_CHIP_ERASE_0); |
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SPI.transfer(DF_CHIP_ERASE_1); |
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SPI.transfer(DF_CHIP_ERASE_2); |
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SPI.transfer(DF_CHIP_ERASE_3); |
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dataflash_CS_inactive(); //initiate flash page erase |
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dataflash_CS_active(); |
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while(!ReadStatus()); |
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dataflash_CS_inactive(); // deactivate dataflash command decoder |
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} |
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