Hi,
I am using FT2232H mini module to write to a N25P256MB memory with an application in C on Windows 10 Professional x64 operation system. I use libMPSEE library v 1.0.0.1, 2014 and FTDI D2XX driver (version 2.12.28) downloaded from
https://www.ftdichip.com/Drivers/D2XX.htm. My problem is that I obtained different speeds for writing data in that memory. For example, for write consecutive pages (256 bytes) with “SPI_Write” function, it took 16 ms or 60 ms in the same execution of program.
This are the parameters that I used for “SPI_InitChannel” function:
channelConf.ClockRate = 30000000; // 30 MHz;
channelConf.LatencyTimer = 2; //2ms
channelConf.configOptions = SPI_CONFIG_OPTION_MODE0 | SPI_CONFIG_OPTION_CS_DBUS3 | SPI_CONFIG_OPTION_CS_ACTIVELOW;
channelConf.Pin = 0x00000000;
This are the functions that I used to write a page (256 bytes) on memory
// SET WRITE ENABLE
sizeToTransfer = 1;
sizeTransfered = 0;
buffer[0] = 0x06; /// WRITE ENABLE
status = SPI_Write(ftHandle, buffer, sizeToTransfer, &sizeTransfered,
SPI_TRANSFER_OPTIONS_SIZE_IN_BYTES |
SPI_TRANSFER_OPTIONS_CHIPSELECT_ENABLE |
SPI_TRANSFER_OPTIONS_CHIPSELECT_DISABLE);
// WRITE DATA
sizeToTransfer = 261;
sizeTransfered = 0;
buffer[0] = 0x02; /// WRITE COMMAND
//buffer[0] = 0x12; /// WRITE COMMAND
buffer[1] = ((address & 0xff000000) >> 24) & 0x000000ff;
buffer[2] = ((address & 0x00ff0000) >> 16) & 0x000000ff;
buffer[3] = ((address & 0x0000ff00) >>
& 0x000000ff;
buffer[4] = (uint8)address;
status = SPI_Write(ftHandle, buffer, sizeToTransfer, &sizeTransfered,
SPI_TRANSFER_OPTIONS_SIZE_IN_BYTES |
SPI_TRANSFER_OPTIONS_CHIPSELECT_ENABLE |
SPI_TRANSFER_OPTIONS_CHIPSELECT_DISABLE);
Any suggestion on what the problem could be or how to resolve this?
