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DataFlash - modified to use Arduino SPI interface instead of directly using registers. Also moved "dataflash_CS_inactive" calls to end of functions instead of beginning so that it doesn't monopolize the SPI bus.

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git-svn-id: https://arducopter.googlecode.com/svn/trunk@1931 f9c3cf11-9bcb-44bc-f272-b75c42450872
This commit is contained in:
rmackay9@yahoo.com 2011-04-30 03:25:31 +00:00
parent 1aabb8c395
commit 3ef57bf3bf
1 changed files with 83 additions and 79 deletions
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162
libraries/DataFlash/DataFlash.cpp
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@ -39,16 +39,11 @@ extern "C" {
}
#include "DataFlash.h"
#include "../SPI/SPI.h"
#define OVERWRITE_DATA 0 // 0: When reach the end page stop, 1: Start overwritten from page 1
// *** INTERNAL FUNCTIONS ***
unsigned char dataflash_SPI_transfer(unsigned char output)
{
SPDR = output; // Start the transmission
while (!(SPSR & (1<<SPIF))); // Wait the end of the transmission
return SPDR;
}
void dataflash_CS_inactive()
{
@ -87,13 +82,10 @@ void DataFlash_Class::Init(void)
dataflash_CS_inactive(); //disable device
// Setup SPI Master, Mode 3, fosc/4 = 4MHz
SPCR = (1<<SPE)|(1<<MSTR)|(1<<CPHA)|(1<<CPOL);
// Setup SPI Master, Mode 3, 2MHz
//SPCR = (1<<SPE)|(1<<MSTR)|(1<<CPHA)|(1<<CPOL)|(1<<SPR0);
//SPSR = (1<<SPI2X);
// Cleanup registers...
tmp=SPSR;
tmp=SPDR;
SPI.begin();
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE3);
SPI.setClockDivider(SPI_CLOCK_DIV4);
// get page size: 512 or 528
df_PageSize=PageSize();
@ -103,28 +95,30 @@ void DataFlash_Class::Init(void)
void DataFlash_Class::ReadManufacturerID()
{
byte tmp;
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
dataflash_CS_active(); // activate dataflash
// Read manufacturer and ID command...
dataflash_SPI_transfer(DF_READ_MANUFACTURER_AND_DEVICE_ID);
SPI.transfer(DF_READ_MANUFACTURER_AND_DEVICE_ID);
df_manufacturer = dataflash_SPI_transfer(0xff);
df_device_0 = dataflash_SPI_transfer(0xff);
df_device_1 = dataflash_SPI_transfer(0xff);
tmp = dataflash_SPI_transfer(0xff);
df_manufacturer = SPI.transfer(0xff);
df_device_0 = SPI.transfer(0xff);
df_device_1 = SPI.transfer(0xff);
tmp = SPI.transfer(0xff);
dataflash_CS_inactive(); // Reset dataflash command decoder
}
// Read the status register
byte DataFlash_Class::ReadStatusReg()
{
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
dataflash_CS_active(); // activate dataflash
// Read status command
dataflash_SPI_transfer(DF_STATUS_REGISTER_READ);
return dataflash_SPI_transfer(0x00); // We only want to extract the READY/BUSY bit
// Read status command
SPI.transfer(DF_STATUS_REGISTER_READ);
return SPI.transfer(0x00); // We only want to extract the READY/BUSY bit
dataflash_CS_inactive(); // Reset dataflash command decoder
}
// Read the status of the DataFlash
@ -150,46 +144,48 @@ void DataFlash_Class::WaitReady()
void DataFlash_Class::PageToBuffer(unsigned char BufferNum, unsigned int PageAdr)
{
dataflash_CS_inactive();
dataflash_CS_active();
if (BufferNum==1)
dataflash_SPI_transfer(DF_TRANSFER_PAGE_TO_BUFFER_1);
else
dataflash_SPI_transfer(DF_TRANSFER_PAGE_TO_BUFFER_2);
if (BufferNum==1) {
SPI.transfer(DF_TRANSFER_PAGE_TO_BUFFER_1);
}else{
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));
SPI.transfer((unsigned char)(PageAdr >> 7));
SPI.transfer((unsigned char)(PageAdr << 1));
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
SPI.transfer((unsigned char)(PageAdr >> 6));
SPI.transfer((unsigned char)(PageAdr << 2));
}
dataflash_SPI_transfer(0x00); // don´t care bytes
SPI.transfer(0x00); // don´t care bytes
dataflash_CS_inactive(); //initiate the transfer
dataflash_CS_active();
while(!ReadStatus()); //monitor the status register, wait until busy-flag is high
dataflash_CS_inactive();
}
void DataFlash_Class::BufferToPage (unsigned char BufferNum, unsigned int PageAdr, unsigned char wait)
{
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
if (BufferNum==1)
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));
if (BufferNum==1) {
SPI.transfer(DF_BUFFER_1_TO_PAGE_WITH_ERASE);
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
SPI.transfer(DF_BUFFER_2_TO_PAGE_WITH_ERASE);
}
dataflash_SPI_transfer(0x00); // don´t care bytes
if(df_PageSize==512){
SPI.transfer((unsigned char)(PageAdr >> 7));
SPI.transfer((unsigned char)(PageAdr << 1));
}else{
SPI.transfer((unsigned char)(PageAdr >> 6));
SPI.transfer((unsigned char)(PageAdr << 2));
}
SPI.transfer(0x00); // don´t care bytes
dataflash_CS_inactive(); //initiate the transfer
dataflash_CS_active();
@ -197,39 +193,45 @@ void DataFlash_Class::BufferToPage (unsigned char BufferNum, unsigned int PageAd
// Check if we need to wait to write the buffer to memory or we can continue...
if (wait)
while(!ReadStatus()); //monitor the status register, wait until busy-flag is high
dataflash_CS_inactive(); // Reset dataflash command decoder
}
void DataFlash_Class::BufferWrite (unsigned char BufferNum, unsigned int IntPageAdr, unsigned char Data)
{
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
if (BufferNum==1)
dataflash_SPI_transfer(DF_BUFFER_1_WRITE);
else
dataflash_SPI_transfer(DF_BUFFER_2_WRITE);
dataflash_SPI_transfer(0x00); //don't cares
dataflash_SPI_transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address
dataflash_SPI_transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address
dataflash_SPI_transfer(Data); //write data byte
if (BufferNum==1) {
SPI.transfer(DF_BUFFER_1_WRITE);
}else{
SPI.transfer(DF_BUFFER_2_WRITE);
}
SPI.transfer(0x00); //don't cares
SPI.transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address
SPI.transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address
SPI.transfer(Data); //write data byte
dataflash_CS_inactive(); // Reset dataflash command decoder
}
unsigned char DataFlash_Class::BufferRead (unsigned char BufferNum, unsigned int IntPageAdr)
{
byte tmp;
dataflash_CS_inactive(); // Reset dataflash command decoder
dataflash_CS_active();
if (BufferNum==1)
dataflash_SPI_transfer(DF_BUFFER_1_READ);
else
dataflash_SPI_transfer(DF_BUFFER_2_READ);
dataflash_SPI_transfer(0x00); //don't cares
dataflash_SPI_transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address
dataflash_SPI_transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address
dataflash_SPI_transfer(0x00); //don't cares
tmp = dataflash_SPI_transfer(0x00); //read data byte
if (BufferNum==1) {
SPI.transfer(DF_BUFFER_1_READ);
}else{
SPI.transfer(DF_BUFFER_2_READ);
}
SPI.transfer(0x00); //don't cares
SPI.transfer((unsigned char)(IntPageAdr>>8)); //upper part of internal buffer address
SPI.transfer((unsigned char)(IntPageAdr)); //lower part of internal buffer address
SPI.transfer(0x00); //don't cares
tmp = SPI.transfer(0x00); //read data byte
dataflash_CS_inactive(); // Reset dataflash command decoder
return (tmp);
}
@ -237,38 +239,40 @@ unsigned char DataFlash_Class::BufferRead (unsigned char BufferNum, unsigned int
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
SPI.transfer(DF_PAGE_ERASE); // Command
if(df_PageSize==512){
dataflash_SPI_transfer((unsigned char)(PageAdr >> 7));
dataflash_SPI_transfer((unsigned char)(PageAdr << 1));
SPI.transfer((unsigned char)(PageAdr >> 7));
SPI.transfer((unsigned char)(PageAdr << 1));
}else{
dataflash_SPI_transfer((unsigned char)(PageAdr >> 6));
dataflash_SPI_transfer((unsigned char)(PageAdr << 2));
SPI.transfer((unsigned char)(PageAdr >> 6));
SPI.transfer((unsigned char)(PageAdr << 2));
}
dataflash_SPI_transfer(0x00); // "dont cares"
SPI.transfer(0x00); // "dont cares"
dataflash_CS_inactive(); //initiate flash page erase
dataflash_CS_active();
while(!ReadStatus());
dataflash_CS_inactive(); //make sure to toggle CS signal in order
}
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);
SPI.transfer(DF_CHIP_ERASE_0);
SPI.transfer(DF_CHIP_ERASE_1);
SPI.transfer(DF_CHIP_ERASE_2);
SPI.transfer(DF_CHIP_ERASE_3);
dataflash_CS_inactive(); //initiate flash page erase
dataflash_CS_active();
while(!ReadStatus());
dataflash_CS_inactive(); //make sure to toggle CS signal in order
}
// *** DATAFLASH PUBLIC FUNCTIONS ***