關於 FT260Q 開發版 DS_UMFT260EV1A操作方法(Windows)

 關於 FT260Q 開發版 DS_UMFT260EV1A I2C操作方法(Windows)

FT260Q 對I2C的指令做的比較單純, 大部份FT260Q已包裹起來(類似Linux 的 I2C_dev )

如果想要自己下達I2C每一個步驟的指令, 可以考慮使用CH341A

CH341A優點是可以完全自行控制, 缺點是程式碼要增加百倍.

（CH341也有提供簡單的包裹式指令集）

SCL : GPIO0

SDL : GPIO1

開發版上面還多掛了一顆 EEPROM AT24C02D

Device Address: 0x50

如果要取消這顆EEPROM , 把開發版之 JP8 切斷

開發版 DS_UMFT260EV1A

https://ftdichip.com/products/umft260ev1a/

EEPROM AT24C02D

https://www.microchip.com/en-us/product/at24c02d

FT260Q 

https://ftdichip.com/products/ft260q/

LibFT260

Application Note AN_395 User Guide for LibFT260 

https://www.ftdichip.com/Support/Documents/AppNotes/AN_395_User_Guide_for_LibFT260.pdf

這是原廠提供的一組函式庫,可以將指量傳輸給FT260Q

https://ftdichip.com/software-examples/

最下面那個沒有說明的 Libft260

https://ftdichip.com/wp-content/uploads/2022/10/LibFT260-v1.1.6.zip

解壓縮後

\LibFT260-v1.1.6\imports\LibFT260\inc\LibFT260.h

\LibFT260-v1.1.6\imports\LibFT260\lib\i386\LibFT260.lib, LibFT260.dll 

範例程式 (須要使用 Visual Studio )

\LibFT260-v1.1.6\samples\I2C

原始範例程式可以使用 Device Address  0x50 對EEPROM AT24C02D直接讀寫.

下面是直接修改對EEPROM AT24C256 直接讀寫. 

// Open Device

    FT260_HANDLE mhandle1 = INVALID_HANDLE_VALUE;

    FT260_STATUS ftStatus = FT260_OK;

    DWORD devNum = 0;

    FT260_CreateDeviceList(&devNum);

    // #define VID 0x0403  #define PID 0x6030

    ftStatus = FT260_OpenByVidPid(VID ,PID, 0, &mhandle1) ;

    printf("FT260_OpenByVidPid = %d\n",ftStatus );

    ftStatus = FT260_I2CMaster_Init(mhandle1, 100);

// (5)Read EEPROM 

 unsigned long len;

 DWORD writeLength = 0;

 DWORD readLength = 0;

 char dataw[10], datar[10];

 gI2CAddr = 0x51;

 writeLength = 0;

 dataw[0] = 0x00;

 dataw[1] = 0x00;

 FT260_I2CMaster_Write(mhandle1, gI2CAddr, FT260_I2C_START, &dataw, 2, &writeLength);

 writeLength = 0;

 len = 8;

 FT260_I2CMaster_Read(mhandle1, gI2CAddr, (FT260_I2C_FLAG)(FT260_I2C_REPEATED_START | FT260_I2C_STOP),

     datar, len, &readLength, 5000);

// (6)Write EEPROM 

 unsigned long len;

 DWORD writeLength = 0;

 char data[10];

 char addr;

 FT260_STATUS ftStatusW1, ftStatusW2 = FT260_OK;

 gI2CAddr = 0x51;

 writeLength = 0;

 data[0] = 0x00; // Data Address MSB

 data[1] = 0x00; // Data Address LSB

 

 ftStatusW1 = FT260_I2CMaster_Write(mhandle1, gI2CAddr, FT260_I2C_START, &addr, 2, &writeLength);

 data[0] = 0xAA;  // Write Data 

 data[1] = 0x22;

 data[2] = 0x33;

 data[3] = 0x44;

 data[4] = 0x55;

 data[5] = 0x66;

 data[6] = 0x77;

 data[7] = 0x88;

 ftStatusW2 = FT260_I2CMaster_Write(mhandle1, gI2CAddr, FT260_I2C_STOP, &data[0], 8, &writeLength);

上圖和規格書的要求很類似

比較難的是  I2C_FLAG 的選擇

建議是各種指令都下一次, 使用分析儀來解析其不同之處

enum FT260_I2C_FLAG

{

FT260_I2C_NONE  = 0,

FT260_I2C_START = 0x02,

FT260_I2C_REPEATED_START = 0x03,

FT260_I2C_STOP  = 0x04,

FT260_I2C_START_AND_STOP = 0x06

};

相關解釋可以查看AN_395_User_Guide_for_LibFT260.pdf

Page 20  4.2 I2C Master Functions