/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- /* DataFlash.cpp - DataFlash log library generic code */ #include #include "DataFlash.h" // *** DATAFLASH PUBLIC FUNCTIONS *** void DataFlash_Class::StartWrite(int16_t PageAdr) { df_BufferNum=1; df_BufferIdx=4; df_PageAdr=PageAdr; df_Stop_Write=0; WaitReady(); // We are starting a new page - write FileNumber and FilePage BufferWrite(df_BufferNum,0,df_FileNumber>>8); // High byte BufferWrite(df_BufferNum,1,df_FileNumber&0xFF); // Low byte BufferWrite(df_BufferNum,2,df_FilePage>>8); // High byte BufferWrite(df_BufferNum,3,df_FilePage&0xFF); // Low byte } void DataFlash_Class::FinishWrite(void) { df_BufferIdx=0; BufferToPage(df_BufferNum,df_PageAdr,0); // Write Buffer to memory, NO WAIT df_PageAdr++; if (DF_OVERWRITE_DATA==1) { if (df_PageAdr>df_NumPages) // If we reach the end of the memory, start from the begining df_PageAdr = 1; } else { if (df_PageAdr>df_NumPages) // If we reach the end of the memory, stop here df_Stop_Write=1; } if (df_BufferNum==1) // Change buffer to continue writing... df_BufferNum=2; else df_BufferNum=1; } void DataFlash_Class::WriteByte(uint8_t data) { if (!df_Stop_Write) { BufferWrite(df_BufferNum,df_BufferIdx,data); df_BufferIdx++; if (df_BufferIdx >= df_PageSize) // End of buffer? { df_BufferIdx=4; //(4 bytes for FileNumber, FilePage) BufferToPage(df_BufferNum,df_PageAdr,0); // Write Buffer to memory, NO WAIT df_PageAdr++; if (DF_OVERWRITE_DATA==1) { if (df_PageAdr>df_NumPages) // If we reach the end of the memory, start from the begining df_PageAdr = 1; } else { if (df_PageAdr>df_NumPages) // If we reach the end of the memory, stop here df_Stop_Write=1; } if (df_BufferNum==1) // Change buffer to continue writing... df_BufferNum=2; else df_BufferNum=1; // We are starting a new page - write FileNumber and FilePage BufferWrite(df_BufferNum,0,df_FileNumber>>8); // High byte BufferWrite(df_BufferNum,1,df_FileNumber&0xFF); // Low byte df_FilePage++; BufferWrite(df_BufferNum,2,df_FilePage>>8); // High byte BufferWrite(df_BufferNum,3,df_FilePage&0xFF); // Low byte } } } void DataFlash_Class::WriteInt(int16_t data) { WriteByte(data>>8); // High byte WriteByte(data&0xFF); // Low byte } void DataFlash_Class::WriteLong(int32_t data) { WriteByte(data>>24); // First byte WriteByte(data>>16); WriteByte(data>>8); WriteByte(data&0xFF); // Last byte } // Get the last page written to int16_t DataFlash_Class::GetWritePage() { return df_PageAdr; } // Get the last page read int16_t DataFlash_Class::GetPage() { return df_Read_PageAdr-1; } void DataFlash_Class::StartRead(int16_t PageAdr) { df_Read_BufferNum=1; df_Read_BufferIdx=4; df_Read_PageAdr=PageAdr; WaitReady(); PageToBuffer(df_Read_BufferNum,df_Read_PageAdr); // Write Memory page to buffer //Serial.print(df_Read_PageAdr, DEC); Serial.print("\t"); df_Read_PageAdr++; // We are starting a new page - read FileNumber and FilePage df_FileNumber = BufferRead(df_Read_BufferNum,0); // High byte //Serial.print(df_FileNumber, DEC); Serial.print("\t"); df_FileNumber = (df_FileNumber<<8) | BufferRead(df_Read_BufferNum,1); // Low byte //Serial.println(df_FileNumber, DEC); Serial.print("\t"); df_FilePage = BufferRead(df_Read_BufferNum,2); // High byte df_FilePage = (df_FilePage<<8) | BufferRead(df_Read_BufferNum,3); // Low byte } uint8_t DataFlash_Class::ReadByte() { uint8_t result; WaitReady(); result = BufferRead(df_Read_BufferNum,df_Read_BufferIdx); df_Read_BufferIdx++; if (df_Read_BufferIdx >= df_PageSize) // End of buffer? { df_Read_BufferIdx=4; //(4 bytes for FileNumber, FilePage) PageToBuffer(df_Read_BufferNum,df_Read_PageAdr); // Write memory page to Buffer df_Read_PageAdr++; if (df_Read_PageAdr>df_NumPages) // If we reach the end of the memory, start from the begining { df_Read_PageAdr = 0; } // We are starting a new page - read FileNumber and FilePage df_FileNumber = BufferRead(df_Read_BufferNum,0); // High byte df_FileNumber = (df_FileNumber<<8) | BufferRead(df_Read_BufferNum,1); // Low byte df_FilePage = BufferRead(df_Read_BufferNum,2); // High byte df_FilePage = (df_FilePage<<8) | BufferRead(df_Read_BufferNum,3); // Low byte } return result; } int16_t DataFlash_Class::ReadInt() { uint16_t result; result = ReadByte(); // High byte result = (result<<8) | ReadByte(); // Low byte return (int16_t)result; } int32_t DataFlash_Class::ReadLong() { uint32_t result; result = ReadByte(); // First byte result = (result<<8) | ReadByte(); result = (result<<8) | ReadByte(); result = (result<<8) | ReadByte(); // Last byte return (int32_t)result; } void DataFlash_Class::SetFileNumber(uint16_t FileNumber) { df_FileNumber = FileNumber; df_FilePage = 1; } uint16_t DataFlash_Class::GetFileNumber() { return df_FileNumber; } uint16_t DataFlash_Class::GetFilePage() { return df_FilePage; } void DataFlash_Class::EraseAll(void (*delay_cb)(unsigned long)) { ChipErase(delay_cb); SetFileNumber(0xFFFF); // write the logging format in the last page StartWrite(df_NumPages+1); WriteLong(DF_LOGGING_FORMAT); FinishWrite(); } /* we need to erase if the logging format has changed */ bool DataFlash_Class::NeedErase(void) { StartRead(df_NumPages+1); return ReadLong() != DF_LOGGING_FORMAT; } // This function determines the number of whole or partial log files in the DataFlash // Wholly overwritten files are (of course) lost. uint8_t DataFlash_Class::get_num_logs(void) { uint16_t lastpage; uint16_t last; uint16_t first; if(find_last_page() == 1) return 0; StartRead(1); if(GetFileNumber() == 0XFFFF) return 0; lastpage = find_last_page(); StartRead(lastpage); last = GetFileNumber(); StartRead(lastpage + 2); first = GetFileNumber(); if(first > last) { StartRead(1); first = GetFileNumber(); } if(last == first) { return 1; } else { return (last - first + 1); } } // This function starts a new log file in the DataFlash void DataFlash_Class::start_new_log(void) { uint16_t last_page = find_last_page(); StartRead(last_page); //Serial.print("last page: "); Serial.println(last_page); //Serial.print("file #: "); Serial.println(GetFileNumber()); //Serial.print("file page: "); Serial.println(GetFilePage()); if(find_last_log() == 0 || GetFileNumber() == 0xFFFF) { SetFileNumber(1); StartWrite(1); //Serial.println("start log from 0"); return; } // Check for log of length 1 page and suppress if(GetFilePage() <= 1) { SetFileNumber(GetFileNumber()); // Last log too short, reuse its number StartWrite(last_page); // and overwrite it //Serial.println("start log from short"); } else { if(last_page == 0xFFFF) last_page=0; SetFileNumber(GetFileNumber()+1); StartWrite(last_page + 1); //Serial.println("start log normal"); } } // This function finds the first and last pages of a log file // The first page may be greater than the last page if the DataFlash has been filled and partially overwritten. void DataFlash_Class::get_log_boundaries(uint8_t log_num, int & start_page, int & end_page) { int num = get_num_logs(); int look; if(num == 1) { StartRead(df_NumPages); if(GetFileNumber() == 0xFFFF) { start_page = 1; end_page = find_last_page_of_log((uint16_t)log_num); } else { end_page = find_last_page_of_log((uint16_t)log_num); start_page = end_page + 1; } } else { if(log_num==1) { StartRead(df_NumPages); if(GetFileNumber() == 0xFFFF) { start_page = 1; } else { start_page = find_last_page() + 1; } } else { if(log_num == find_last_log() - num + 1) { start_page = find_last_page() + 1; } else { look = log_num-1; do { start_page = find_last_page_of_log(look) + 1; look--; } while (start_page <= 0 && look >=1); } } } if(start_page == (int)df_NumPages+1 || start_page == 0) start_page=1; end_page = find_last_page_of_log((uint16_t)log_num); if(end_page <= 0) end_page = start_page; } bool DataFlash_Class::check_wrapped(void) { StartRead(df_NumPages); if(GetFileNumber() == 0xFFFF) return 0; else return 1; } // This funciton finds the last log number int DataFlash_Class::find_last_log(void) { int last_page = find_last_page(); StartRead(last_page); return GetFileNumber(); } // This function finds the last page of the last file int DataFlash_Class::find_last_page(void) { uint16_t look; uint16_t bottom = 1; uint16_t top = df_NumPages; uint32_t look_hash; uint32_t bottom_hash; uint32_t top_hash; StartRead(bottom); bottom_hash = ((long)GetFileNumber()<<16) | GetFilePage(); while(top-bottom > 1) { look = (top+bottom)/2; StartRead(look); look_hash = (long)GetFileNumber()<<16 | GetFilePage(); if (look_hash >= 0xFFFF0000) look_hash = 0; if(look_hash < bottom_hash) { // move down top = look; } else { // move up bottom = look; bottom_hash = look_hash; } } StartRead(top); top_hash = ((long)GetFileNumber()<<16) | GetFilePage(); if (top_hash >= 0xFFFF0000) { top_hash = 0; } if (top_hash > bottom_hash) { return top; } return bottom; } // This function finds the last page of a particular log file int DataFlash_Class::find_last_page_of_log(uint16_t log_number) { uint16_t look; uint16_t bottom; uint16_t top; uint32_t look_hash; uint32_t check_hash; if(check_wrapped()) { StartRead(1); bottom = GetFileNumber(); if (bottom > log_number) { bottom = find_last_page(); top = df_NumPages; } else { bottom = 1; top = find_last_page(); } } else { bottom = 1; top = find_last_page(); } check_hash = (long)log_number<<16 | 0xFFFF; while(top-bottom > 1) { look = (top+bottom)/2; StartRead(look); look_hash = (long)GetFileNumber()<<16 | GetFilePage(); if (look_hash >= 0xFFFF0000) look_hash = 0; if(look_hash > check_hash) { // move down top = look; } else { // move up bottom = look; } } StartRead(top); if (GetFileNumber() == log_number) return top; StartRead(bottom); if (GetFileNumber() == log_number) return bottom; return -1; }