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update dataflash for 528 and 512 byte pages

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git-svn-id: https://arducopter.googlecode.com/svn/trunk@1906 f9c3cf11-9bcb-44bc-f272-b75c42450872
This commit is contained in:
mich146@hotmail.com 2011-04-18 11:19:31 +00:00
parent e579f4a6aa
commit a107587af6
2 changed files with 71 additions and 16 deletions
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72
libraries/DataFlash/DataFlash.cpp
View File

@ -9,7 +9,7 @@
version 2.1 of the License, or (at your option) any later version.
Dataflash library for AT45DB161D flash memory
Memory organization : 4096 pages of 512 bytes
Memory organization : 4096 pages of 512 bytes or 528 bytes
Maximun write bandwidth : 512 bytes in 14ms
This code is written so the master never has to wait to write the data on the eeprom
@ -94,6 +94,9 @@ void DataFlash_Class::Init(void)
// Cleanup registers...
tmp=SPSR;
tmp=SPDR;
// get page size: 512 or 528
df_PageSize=PageSize();
}
// This function is mainly to test the device
@ -113,20 +116,32 @@ void DataFlash_Class::ReadManufacturerID()
tmp = dataflash_SPI_transfer(0xff);
}
// Read the status of the DataFlash
byte DataFlash_Class::ReadStatus()
// Read the status register
byte DataFlash_Class::ReadStatusReg()
{
byte tmp;
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
// Read status command
dataflash_SPI_transfer(DF_STATUS_REGISTER_READ);
tmp = dataflash_SPI_transfer(0x00);
return(tmp&0x80); // We only want to extract the READY/BUSY bit
return dataflash_SPI_transfer(0x00); // We only want to extract the READY/BUSY bit
}
// Read the status of the DataFlash
inline
byte DataFlash_Class::ReadStatus()
{
return(ReadStatusReg()&0x80); // We only want to extract the READY/BUSY bit
}
inline
unsigned int DataFlash_Class::PageSize()
{
return(528-((ReadStatusReg()&0x01)<<4)); // if first bit 1 trhen 512 else 528 bytes
}
// Wait until DataFlash is in ready state...
void DataFlash_Class::WaitReady()
{
@ -141,8 +156,14 @@ void DataFlash_Class::PageToBuffer(unsigned char BufferNum, unsigned int PageAdr
dataflash_SPI_transfer(DF_TRANSFER_PAGE_TO_BUFFER_1);
else
dataflash_SPI_transfer(DF_TRANSFER_PAGE_TO_BUFFER_2);
if(df_PageSize==512){
dataflash_SPI_transfer((unsigned char)(PageAdr >> 7));
dataflash_SPI_transfer((unsigned char)(PageAdr << 1));
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
}
dataflash_SPI_transfer(0x00); // don´t care bytes
dataflash_CS_inactive(); //initiate the transfer
@ -160,8 +181,14 @@ void DataFlash_Class::BufferToPage (unsigned char BufferNum, unsigned int PageAd
dataflash_SPI_transfer(DF_BUFFER_1_TO_PAGE_WITH_ERASE);
else
dataflash_SPI_transfer(DF_BUFFER_2_TO_PAGE_WITH_ERASE);
if(df_PageSize==512){
dataflash_SPI_transfer((unsigned char)(PageAdr >> 7));
dataflash_SPI_transfer((unsigned char)(PageAdr << 1));
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
}
dataflash_SPI_transfer(0x00); // don´t care bytes
dataflash_CS_inactive(); //initiate the transfer
@ -213,14 +240,37 @@ void DataFlash_Class::PageErase (unsigned int PageAdr)
dataflash_CS_inactive(); //make sure to toggle CS signal in order
dataflash_CS_active(); //to reset Dataflash command decoder
dataflash_SPI_transfer(DF_PAGE_ERASE); // Command
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6)); //upper part of page address
dataflash_SPI_transfer((unsigned char)(PageAdr << 2)); //lower part of page address and MSB of int.page adr.
if(df_PageSize==512){
dataflash_SPI_transfer((unsigned char)(PageAdr >> 7));
dataflash_SPI_transfer((unsigned char)(PageAdr << 1));
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
}
dataflash_SPI_transfer(0x00); // "dont cares"
dataflash_CS_inactive(); //initiate flash page erase
dataflash_CS_active();
while(!ReadStatus());
}
void DataFlash_Class::ChipErase ()
{
dataflash_CS_inactive(); //make sure to toggle CS signal in order
dataflash_CS_active(); //to reset Dataflash command decoder
// opcodes for chip erase
dataflash_SPI_transfer(DF_CHIP_ERASE_0);
dataflash_SPI_transfer(DF_CHIP_ERASE_1);
dataflash_SPI_transfer(DF_CHIP_ERASE_2);
dataflash_SPI_transfer(DF_CHIP_ERASE_3);
dataflash_CS_inactive(); //initiate flash page erase
dataflash_CS_active();
while(!ReadStatus());
}
// *** DATAFLASH PUBLIC FUNCTIONS ***
void DataFlash_Class::StartWrite(int PageAdr)
{
@ -260,7 +310,7 @@ void DataFlash_Class::WriteByte(byte data)
{
BufferWrite(df_BufferNum,df_BufferIdx,data);
df_BufferIdx++;
if (df_BufferIdx >= 512) // End of buffer?
if (df_BufferIdx >= df_PageSize) // End of buffer?
{
df_BufferIdx=0;
BufferToPage(df_BufferNum,df_PageAdr,0); // Write Buffer to memory, NO WAIT
@ -327,7 +377,7 @@ byte DataFlash_Class::ReadByte()
WaitReady();
result = BufferRead(df_Read_BufferNum,df_Read_BufferIdx);
df_Read_BufferIdx++;
if (df_Read_BufferIdx >= 512) // End of buffer?
if (df_Read_BufferIdx >= df_PageSize) // End of buffer?
{
df_Read_BufferIdx=0;
PageToBuffer(df_Read_BufferNum,df_Read_PageAdr); // Write memory page to Buffer

5
libraries/DataFlash/DataFlash.h
View File

@ -56,12 +56,15 @@ class DataFlash_Class
void BufferToPage (unsigned char BufferNum, unsigned int PageAdr, unsigned char wait);
void PageToBuffer(unsigned char BufferNum, unsigned int PageAdr);
void WaitReady();
unsigned char ReadStatusReg();
unsigned char ReadStatus();
unsigned int PageSize();
public:
unsigned char df_manufacturer;
unsigned char df_device_0;
unsigned char df_device_1;
unsigned int df_PageSize;
DataFlash_Class(); // Constructor
void Init();
@ -69,12 +72,14 @@ class DataFlash_Class
int GetPage();
int GetWritePage();
void PageErase (unsigned int PageAdr);
void ChipErase ();
// Write methods
void StartWrite(int PageAdr);
void FinishWrite();
void WriteByte(unsigned char data);
void WriteInt(int data);
void WriteLong(long data);
// Read methods
void StartRead(int PageAdr);
unsigned char ReadByte();