Brief:
Want to use STM32L432 MCU and FUSB302B PD controller asking voltage higher then 5V.

Question:
Where am I set wrong of the PD controller?
Is there anything else I need to consider when asking the PD source?

Hi, I'm working on a project for digital auxliary power in card size.
The puropse is using Type-C connector connect to any source, have four output voltage can be choose, they are 3.3V / 5V / 12V and 24V.

I'm using power delivery (PD) for asking voltage higher then 5V for more output wattage.
Althought I had completed the power stage for 5V input, now I want to write PD firmware to asking higher voltage.

The MCU I used is STM32F432KC, PD controller I used is ONSemi FUSB302B.
I got stuck when I want to receive power data object (PDO) from PD source, like the wall adapter.

Here is register map of FUSB302B:

And here is my register setup after FUSB302B_start_CC_communication():

The function is doing following things:

/* @brief    start PD communication on CC pin
 * @ param    I2C_HandleTypeDef    *hi2c    specific i2c HAL driver
 * @ param    FUSB302B_t            *pfusb    fusb object pointer
 * [USER=190411]@Return[/USER]    FUSB302B_status_t    status     FUSB302 status
 */
FUSB302B_status_t FUSB302B_start_CC_communication(I2C_HandleTypeDef* hi2c, FUSB302B_t* pfusb){
    FUSB302B_status_t status;
    // update register data
    FUSB302B_read_all(hi2c, pfusb);

    switch(pfusb->cc_pin){
    case CC_NONE:
        return FUSB302B_OK;
        break;

    case CC_PIN1:
        // connect CC1 pin to DAC
        status = FUSB302B_write_reg(hi2c, pfusb, Reg_Switches0, (pfusb->reg.switches0 & ~FUSB302B_Switches0_MEAS_CC_MASK) \
                | FUSB302B_Switches0_MEAS_CC1);
        // connect CC1 to BMC decoder
        status &= FUSB302B_write_reg(hi2c, pfusb, Reg_Switches1, (pfusb->reg.switches1 & ~FUSB302B_Switches1_TXCC_MASK) | FUSB302B_Switches1_TXCC1);
        break;

    case CC_PIN2:
        // connect CC1 pin to DAC
        status = FUSB302B_write_reg(hi2c, pfusb, Reg_Switches0, (pfusb->reg.switches0 & ~FUSB302B_Switches0_MEAS_CC_MASK) \
                | FUSB302B_Switches0_MEAS_CC2 );
        // connect CC1 to BMC decoder
        status &= FUSB302B_write_reg(hi2c, pfusb, Reg_Switches1, (pfusb->reg.switches1 & ~FUSB302B_Switches1_TXCC_MASK) | FUSB302B_Switches1_TXCC2);
        break;
    default:
        break;
    }
    // reset PD logic
//    status &= FUSB302B_write_reg(hi2c, pfusb, Reg_Reset, (pfusb->reg.reset & ~FUSB302B_Reset_Reserved_MASK) | FUSB302B_Reset_PD_RESET);
    FUSB302B_read_all(hi2c, pfusb);
    if (status != FUSB302B_OK)
        return FUSB302B_ERROR;
    else
        return FUSB302B_OK;
}

I think after I execute FUSB302B_start_CC_communication, bit4 of status1 (RX FIFO Full) should be set because the source should transmit some data and PD controller received it, but after I execute it many times, the bit always stay 0.

The question is:
Where am I set wrong of the PD controller?
Is there anything else I need to consider when asking the PD source?
If the code have anything to improve, please fele free to give me advice!

I reference the following materials for developmenting:

1. https://hackaday.com/2023/02/22/all-about-usb-c-replying-low-level-pd/ -> I reference the setup from this.
2. https://github.com/tschiemer/usbc-pd-fusb302-d -> I reference the setup sequence and data structure.
3. https://www.usb.org/document-library/usb-power-delivery -> USB PD2.0 spec for message handling, even thought I can not received any message...

Something I guess may cause the problem is the speed of MCU is not fast enought, power converter IRQ using most of resource of CPU.
I measure the main loop period is around 1.5 second (by measureing LED5), and PD protocol defined the sink device should send RDO(request data object) to source in 500mS after Good_CRC been send.
For bypass the resource issue, I try decrease the interrupt frequency from 200kHz to 100kHz, but it still the same.
Also I try to disable AUTO_CRC and it has no effect either.

Here is my project source code and PCB design for reference:
https://github.com/HabonRoof/PD-AuxPower-Card
Thanks for the reading.

Best reguards!

 

7 years late, but had a similar issue today and what was wrong was that i was using the automatic toggle functionality: setting register CONTROL2 to 0x0d, but then i kept it like that. You have to turn it off. After you use it and read the value from register STATUS1A, you should set CONTROL2 to 0x02. after that you can connect the bmc transmitter to the correct cc pin and so on. Also, don't forget to enable power to the different components through the power register, and to keep the pull down resistors on the cc pins through the SWITCHES0 register.