public override EEPROM_BUFFER ReadPage(int addr, int len = EEPROM_BASE_CLASS.DEFAULT_PAGE_SIZE)
{
var r = new EEPROM_BUFFER(len);
#if NUSBIO2
var inBuffer = new List <byte>()
{
(byte)(pageAddr >> 8), (byte)(pageAddr & 0xFF)
};
r.Buffer = new byte[len]; // Must pre allocate the buffer for now
r.Succeeded = Program.HelloWorld.__I2C_Helper_WriteRead(base.DeviceId, inBuffer.ToArray(), r.Buffer) == 1;
return(r);
#else
#if OPTIMIZE_I2C_CALL
// This method is faster because the I2C write and read operations are
// combined in one USB buffer
r.Succeeded = this._i2c.Send16BitsAddressAndReadBuffer(addr, len, r.Buffer);
#else
// Slower method because we have one USB operation for the I2C write
// and one USB operation for the I2C read
// The transfer of the data per say is the same
var tmpArray = new byte[2];
if (this._i2c.WriteBuffer(new byte[2] {
(byte)(addr >> 8), (byte)(addr & 0xFF)
}))
{
r.Succeeded = this._i2c.ReadBuffer(len, r.Buffer);
}
#endif
#endif
return(r);
}
public static EEPROM_BUFFER ReadPageOptimized_SendReadData
(GpioSequence spiSeq, int startByteToSkip, int byteToRead, SPIEngine spi)
{
var nusbio = spi.Nusbio;
var eb = new EEPROM_BUFFER();
if (spiSeq.Send(nusbio))
{
var inBuffer = spiSeq.GetInputBuffer(nusbio).ToList();
if (startByteToSkip == 0)
{
inBuffer.RemoveAt(0); // Extra byte from somewhere
}
if (startByteToSkip > 0)
{
var offSetToSkip = SPIEngine.BYTES_PER_BIT * 8 * startByteToSkip; // Skip the first 3 bytes, bitbanging the command and 16 bit address
inBuffer = inBuffer.GetRange(offSetToSkip, inBuffer.Count - offSetToSkip);
}
var buffer = __spi_buf_r(byteToRead, inBuffer, spi);
for (var i = 0; i < startByteToSkip; i++) // Remove the last startByteToSkip because they were not yet sent
{
buffer.RemoveAt(buffer.Count - 1);
}
eb.Buffer = buffer.ToArray();
eb.Succeeded = true;
}
return(eb);
}
/*
* Write enable
* 10011000
* Write Disable
* 10000000
* Write
* //dt1 = 00101000 | ((adrs & 0000011100000000) >> 8) ;
* //dt2 = (adrs & 0000000011111111) ;
* Read
* //dt1 = 00110000 | ((adrs & 0000011100000000) >> 8) ;
* //dt2 = (adrs & 0b0000000011111111) ;
*/
public override EEPROM_BUFFER ReadPage(int addr, int len = -1)
{
if (len == -1)
{
len = PAGE_SIZE;
}
var eb = new EEPROM_BUFFER();
int dt1, dt2;
//dt1 = 0b00110000 | ((adrs & 0b0000011100000000) >> 8) ;
//dt2 = (adrs & 0b0000000011111111) ;
dt1 = 0x30 | ((addr & 0x700) >> 8);
dt2 = (addr & 0xFF);
var spiBufferWrite = new List <byte>()
{
(byte)dt1, (byte)dt2
};
var spiBufferRead = GetEepromApiDataBuffer(len);
var buffer = new List <byte>();
buffer.AddRange(spiBufferWrite);
buffer.AddRange(spiBufferRead);
var r = this.SpiTransfer(buffer);
if (r.Succeeded)
{
eb.Succeeded = true;
eb.Buffer = r.Buffer.GetRange(spiBufferWrite.Count, r.Buffer.Count - spiBufferWrite.Count).ToArray();
}
return(eb);
}
public override EEPROM_BUFFER ReadPage(int addr, int len = -1)
{
if (len == -1)
{
len = PAGE_SIZE;
}
var eb = new EEPROM_BUFFER();
var spiBufferWrite = GetEepromApiReadBuffer(addr);
var spiBufferRead = GetEepromApiDataBuffer(len);
var buffer = new List <byte>();
buffer.AddRange(spiBufferWrite);
buffer.AddRange(spiBufferRead);
var r = this.SpiTransfer(buffer);
if (r.Succeeded)
{
eb.Succeeded = true;
eb.Buffer = r.Buffer.GetRange(spiBufferWrite.Length, r.Buffer.Count - spiBufferWrite.Length).ToArray();
}
return(eb);
}
/// <summary>
/// Read pages using an optimized way to transfer page
/// Transfer around 20Kb/s.
///
/// About optimizing transfer with Nusbio
///
/// There are 2 optimizations
/// 1) - We send 64 0 from the master to the slave to force the slave to send the data
/// Since we know it all 0 the data line need to be set only once. We therefore save 1 cycle out of 3.
/// The cycle saved are used to request more data in the limited 2024 cycles buffer that we hace in one
/// USB Transaction
/// </summary>
/// <param name="addr"></param>
/// <param name="len"></param>
/// <returns></returns>
public EEPROM_BUFFER ReadPageOptimized(int addr, int len = -1)
{
if (len == -1)
{
len = this.PAGE_SIZE;
}
var eb = new EEPROM_BUFFER();
//int byteSent = 0;
var nusbio = this._spi.Nusbio;
var spi = this._spi;
var spiBufferCmdAddr = this.GetEepromApiReadBuffer(addr);
var spiBufferDummyData = this.GetEepromApiDataBuffer(len);
var buffer = new List <byte>();
buffer.AddRange(spiBufferCmdAddr); // Command + 16 bit Address
buffer.AddRange(spiBufferDummyData); // Dummy data to be sent which will force the EEPROM to send the right data back
var startByteToSkip = spiBufferCmdAddr.Length;
var finalBuffer = new List <byte>();
this._spi.Select(); // Set select now so it is part of the bit banging sequence
try
{
var byteBitBanged = 0;
var spiSeq = new GpioSequence(nusbio.GetGpioMask(), nusbio.GetTransferBufferSize());
// Convert the 3 Command Bytes + the 64 0 Bytes into a bit banging buffer
// The 64 bytes part is optimized since all the value are 0 we just need to set
// the data line once
for (var bx = 0; bx < buffer.Count; bx++)
{
for (byte bit = (1 << 7); bit > 0; bit >>= 1) // MSB - Most significant bit first
{
spiSeq.ClockBit(nusbio[spi.ClockGpio], nusbio[spi.MosiGpio], WinUtil.BitUtil.IsSet(buffer[bx], bit),
compactData: (bx >= spiBufferCmdAddr.Length) // For simplicity do not compact the first 3 commands byte, so we know exactly where the data start after the first 3 bytes
);
}
byteBitBanged++;
if (spiSeq.IsSpaceAvailable(8 * 2)) // If we only have left space to compute 1 byte or less
{
var peb = ReadPageOptimized_SendReadData(spiSeq, startByteToSkip, byteBitBanged, this._spi);
if (peb.Succeeded)
{
finalBuffer.AddRange(peb.Buffer);
spiSeq = new GpioSequence(nusbio.GetGpioMask(), nusbio.GetTransferBufferSize());
startByteToSkip = 0; // We skipped it, let's forget about it
byteBitBanged = 0;
}
else
{
return(eb); // failed
}
}
}
var peb2 = ReadPageOptimized_SendReadData(spiSeq, startByteToSkip, byteBitBanged, this._spi);
if (peb2.Succeeded)
{
finalBuffer.AddRange(peb2.Buffer);
eb.Buffer = finalBuffer.ToArray();
eb.Succeeded = true;
}
else
{
return(eb); // failed
}
}
finally
{
this._spi.Unselect();
}
return(eb);
}