STM32CubeMonUCPD ibus monitor show value zero

[Robert7]

Hello,

I am using STM32-U585I-IOT02A board. I have initialized USB-C SINK TCPP project with fixed 9V settings. On STM32CubeMonUCPD, 'ibus(mA)' value is always zero when connected BMS board shows charging current more than 1A. Please let me know if I missed something. Thank you.

[FBL]

Hi @Robert7 

Good catch! It seems a bug in GUI interface. To reproduce, could you specify your BMS board? Could you reproduce using STM32G071B-DISCO - USB Type-C and Power Delivery Discovery kit with STM32G071RB MCU - STMicroelectronics. Or, you can add debug prints in the firmware to log current measurement values.

An internal ticket 188693 is submitted to dedicated team for further investigation.

[Robert7]

Hi FBL,

Thank you for your reply.

I try to build a 'PDO SINK' project on B-U585I-IOT02A and I have followed steps of 'STMicroelectronics.X-CUBE-TCPP_GettingStarted'.

On STM32CubeMonUCPD, 'ibus(mA)' value seems mixed with Vbus(mV). But I can't find where is TCPP03-M20's Iana_gain settings in the generated code.

I would appreciate it if you could let me know where is PD13 USB_IANA calculation in 'BSP_USBPD_PWR_VBUSGetCurrent' function and how to separate the trace in LPUART1 or ADC4.

Please find below screenshot and attached for your reference.

Best regards.

Robert

[FBL]

Hi @Robert7 

Just to keep you informed, I am not an expert in TCPPxx, but you can find GPIO configuration of Iana on the TCPP0203_PORT0_IANA_GPIO_PIN in PWR_TCPP0203_GPIOConfigInit(). You can add debug prints to make sure you are getting correct values

[LLECH.1 · Accepted solution]

Hi @Robert7

The behavior you observed in STM32CubeMon UCPD is normal since the ADC measurement in BSP of B-U585I-IOT02A is not implemented. Indeed you can find in b_u585i_iot02a_usbpd_pwr.c file that API BSP_USBPD_PWR_VBUSGetCurrent doesn't compute the current value (adc_value variable) but only initializes it to 0.  If you want this current to be measured by the ADC, you can configure it by following this example : x-cube-tcpp/Drivers/BSP/X-NUCLEO-DRP1M1/drp1m1_usbpd_pwr.c at main · STMicroelectronics/x-cube-tcpp · GitHub

. In this example, ADC is configured to continuously read the current on VBUS line. A DMA channel is also configured to transfer the data read by ADC to a buffer in memory. 

Best Regards,

Lucas