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// This is pseudocode close to the real one

byte[] Command = new byte[64];

byte[] Reply = new byte[64];

Command[0] = (byte) FX2_Commands.CMD_FX2_FLASH_WRITE_COMMAND;

Command[1] = (byte) 1; //Numeber of SPI commands used by spi_command() : putcSPI(SPI_RDID); 

Command[2] = (byte) 3; //Number of SPI bytes as reply: mid == 0xEF && did == 0x40 && uid == 0x17

Command[3] = (byte) 0x9F; //(byte)SPI_Commands.CMD_SPI_RDID; // SPI_RDID 0x9F ≡ get ID command

Command[4] = (byte)0;

Command[5] = (byte)0;

Command[6] = (byte)0;

/*

TE_USB_FX2_SendCommand (Command[0] = (byte) FX2_Commands.CMD_FX2_FLASH_WRITE_COMMAND) calls "case CMD_FLASH_WRITE_COMMAND"

"case CMD_FLASH_WRITE_COMMAND" calls spi_command(EP1OUTBUF[1], &EP1OUTBUF[3], EP1OUTBUF[2], &EP1INBUF[1]) with EP1OUTBUF[3]= SPI_RDID SPI Flash Command

EP1OUTBUF = Command

Reply = EP1INBUF

*/

if (TE_USB_FX2_SendCommand(..., Command, CmdLength, Reply, ReplyLength, 5000) == true) 

{

LogTextLine += "SPI Flash IDCODE " + "uid = 0x" + Reply1[1].ToString("x") + "mid = 0x "+ Reply1[2].ToString("x") + " did = 0x" + Reply1[3].ToString("x") + "\r\n";

}

//This is a piece of real code (FW running on USB FX2 microcontroller) https://github.com/Trenz-Electronic/TE-USB-Suite/blob/master/TE_USB_FX2.firmware/te_usb_api.ver.3.2/te_api.c

//Lines 207-211

case CMD_FLASH_WRITE_COMMAND:

EP1INBUF[0] = 0x55;

//void spi_command(BYTE CmdLen, unsigned char *CmdData, BYTE RdLen, unsigned char *RdData)

spi_command(EP1OUTBUF[1], &EP1OUTBUF[3], EP1OUTBUF[2], &EP1INBUF[1]);

new_data = 1;

break;

/*

Command[0] = CMD_FLASH_WRITE_COMMAND; used by TE_USB_FX2_SendCommand () to call "case CMD_FLASH_WRITE_COMMAND" and then spi_command()

EP1OUTBUF[1] = CmdLen = Command[1]= CmdLength = 1; // used by spi_command(), MD_SPI_RDID = 0x9F is a single byte

EP1OUTBUF[2] = RdLen = Command[2]= ReplyLength = 3; // used by spi_command(), SPI Flash ID should be 3 byte

EP1OUTBUF[3] = Command[3] = CMD_SPI_RDID = 0x9F; //used by spi_command()

Reply[0] = EP1INBUF[0] = 0x55;

Reply[1] = EP1INBUF[1] = 0xEF; // for example

Reply[2] = EP1INBUF[2] = 0x40; // for example

Reply[3] = EP1INBUF[3] = 0x17; // for example

*/