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Author Topic: LibMPSSE Beta 1.0.2  (Read 3015 times)

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LibMPSSE Beta 1.0.2
« on: March 04, 2021, 10:46:48 AM »

Hi Everyone,

We have a beta version of libMPSSE 1.0.2 which includes various improvements as well as a Linux 64-bit version.

This also adds support for our latest Power Delivery ICs (FT23xHP, FT223xHP, FT423xHP).

Please contact support1@ftdichip.com for this version before we release it to our website.

Let us know if you have any feedback please.

Best Regards,
FTDI Community
« Last Edit: June 13, 2022, 09:33:21 AM by FTDI Community »

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Re: LibMPSSE Beta 1.0.2
« Reply #1 on: August 16, 2022, 10:48:47 AM »

LibMPSSE 1.0.3 has now been released to the website:


Note v1.0.3 has a known bug which will be fixed in a future version.

The code is not sending I2C ACK after 1st byte read.

Please check this bit of code in particular:

static FT_STATUS I2C_Read8bitsAndGiveAck(FT_HANDLE handle, uint8 *data, bool ack)
    uint8 buffer[20], inBuffer[5];
    uint32 noOfBytes = 0;
    DWORD noOfBytesTransferred;

    /*set direction*/
    buffer[noOfBytes++] = MPSSE_CMD_SET_DATA_BITS_LOWBYTE;/* MPSSE command */
    buffer[noOfBytes++] = VALUE_SCLLOW_SDALOW; /*Value*/
    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN; /*Direction*/
    /*Command to read 8 bits*/
    buffer[noOfBytes++] = MPSSE_CMD_DATA_IN_BITS_POS_EDGE;
    buffer[noOfBytes++] = DATA_SIZE_8BITS;/*0x00 = 1bit; 0x07 = 8bits*/
    /*Command MPSSE to send data to PC immediately */
    buffer[noOfBytes++] = MPSSE_CMD_SEND_IMMEDIATE;
    /* Fix introduced to solve a glitch issue */
    buffer[noOfBytes++] = MPSSE_CMD_SET_DATA_BITS_LOWBYTE; 
    buffer[noOfBytes++] = VALUE_SCLLOW_SDALOW ;
    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN;                                                                                                     

    /* Burn off one I2C bit time */
    buffer[noOfBytes++] = MPSSE_CMD_DATA_OUT_BITS_NEG_EDGE;
    buffer[noOfBytes++] = 0; /*0x00 = 1bit; 0x07 = 8bits*/ 
    buffer[noOfBytes++] = ack ? SEND_ACK : SEND_NACK;/*Only MSB is sent*/

SDA has been left as input:

    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN;   

But this should actually be output:

    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAOUT; 

Best Regards,
FTDI Community