ST STM32G071B-DISCO User manual

February 2019 UM2546 Rev 1 1/30
1
UM2546
User manual
STM32G071B-DISCO USB-C Discovery kit
Introduction
The STM32G071B-DISCO USB-C Discovery kit comes on top of the STM32Cube™ as a
firmware package that offers a full set of software components based on a modular
architecture allowing each module to be used separately in standalone sink applications.
The STM32G071B-DISCO USB-C Discovery kit may be executed in two different modes
depending on the position of the switch: standalone sink mode, or spy mode. The spy mode
does not use the USBPD stack. In this mode, the protocol information on the CC lines is
decoded, and no protocol action may be triggered. But in the standalone sink mode, some
protocol actions may be executed.
In both modes, the UCPD block port 1 is used, and may give an example for a customer
application.
The STM32G071B-DISCO USB-C Discovery kit has been designed to run on
STM32G071B-DISCO (MB1378).
Figure 1. STM32G071B-DISCO USB-C Discovery kit
www.st.com

Contents UM2546
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Contents
1 Demonstration description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Demonstration package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Demonstration architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.1 Analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.2 HAL level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.3 Middleware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 STM32G071RB resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3.1 Hardware resources used by the UCPD demonstration . . . . . . . . . . . . . 9
1.3.2 Peripherals used by the UCPD demonstration . . . . . . . . . . . . . . . . . . . 10
1.3.3 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 Demonstration functional description . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1 Demo startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.1 Normal processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 UCPD demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.1 Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.2 LED indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Hardware settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1 STM32G071B-DISCO board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Software settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Clock Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Programming the demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.1 Using Binary file . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.2 Using preconfigured projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 Software description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Demonstration Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Application overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2.1 Spy mode case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2.2 Standalone sink case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.3 Demonstration menu details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.4 STM32CubeMonitor USB Type-C PD tool with G0 Discovery kit . . . . . 22

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5.2.5 Dynamic memory use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 Middlewares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3.1 USB PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3.2 FreeRTOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6 Footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8 Table of references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

List of tables UM2546
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List of tables
Table 1. STM32G071RBT peripherals used by the UCPD demonstration. . . . . . . . . . . . . . . . . . . . 10
Table 2. STM32G071RBT demonstration interrupts usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3. LED assignation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4. Main application functions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5. Main applications functions description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 6. Code example: MOSFET control in spy mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 7. RAM/ROM consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 8. Table of acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 9. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

UM2546 Rev 1 5/30
UM2546 List of figures
5
List of figures
Figure 1. STM32G071B-DISCO USB-C Discovery kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Demonstration folder organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Discovery folder organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. STM32G071B-DISCO USB-C Discovery kit firmware - Software architecture . . . . . . . . . . . 7
Figure 5. STM32G071RBT hardware blocs used by the UCPD demonstration . . . . . . . . . . . . . . . . . 9
Figure 6. STM32G071RBT peripherals used by the UCPD demonstration. . . . . . . . . . . . . . . . . . . . 10
Figure 7. Mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8. LED indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9. STM32G071B-DISCO top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 10. STM32G071B-DISCO bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 11. STM32G0 software architecture overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 12. CC lines isolation/pull down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. Menu sequence in spy mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 14. Menu sequence in standalone sink mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 15. Welcome screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 16. Attach screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 17. PD capability screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 18. Power screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 19. Power role screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 20. Fast role swap screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 21. Data role screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 22. Display Port screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 23. Power delivery information screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 24. Source profile screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 25. Distant Sink profile screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 26. Action screen (only standalone mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 27. Version screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 28. STM32CubeMonitor USB Type-C PD tool debug trace selection. . . . . . . . . . . . . . . . . . . . 23
Figure 29. STM32G0 top and bottom view of Discovery board (MB1378). . . . . . . . . . . . . . . . . . . . . . 23
Figure 30. Trace example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 31. Full STM32CubeMonitor USB Type-C PD tool example . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Demonstration description UM2546
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1 Demonstration description
The demonstration has been designed with the following objectives:
•Toolkit with low memory consumption
•Modular applications: independents with high level of reuse
•Basic menu navigation through joystick
•Comprehensive G0 functional coverage
1.1 Demonstration package
Figure 2 shows the demonstration folder organization:
Figure 2. Demonstration folder organization
The demonstration sources are located in the "Projects" folder of the STM32Cube package
for each supported board, here in STM32G071B-DISCO folder.
The demonstration firmware aims at demonstrating how USB-PD version PD3.0 has been
implemented in the context of STM32G0xx devices.
Figure 3 illustrates the organization of the UCPD folder.

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UM2546 Demonstration description
29
Figure 3. Discovery folder organization
UCPD_Analyzer sub-folders:
•Inc: Analyzer application header files
•Src: Analyzer application implementation
•Software development environments:
– EWARM: IAR embedded workbench
– MDK ARM: Keil Microcontroller Development Kit
– SW4STM32: System workbench for STM32
1.2 Demonstration architecture overview
The top level software architecture of the STM32G071B-DISCO USB-C Discovery kit
firmware is represented on Figure 4. The software elements mentioned in this diagram are
briefly depicted in dedicated sections.
Figure 4. STM32G071B-DISCO USB-C Discovery kit firmware - Software architecture

Demonstration description UM2546
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1.2.1 Analyzer
The UCPD Analyzer application uses only one G0 port which mainly consists in Type-C
connection/disconnection detection and Type-C power contract negotiation.
1.2.2 HAL level
HAL level layer consists in the stm32g0xx.HAL drivers together with the STM32G071B-
DISCO board support package (BSP).
1.2.3 Middleware
The middleware provides the following modules:
•FreeRTOS: FreeRTOS open source solution. UCPD application is based on
FreeRTOS.
•USBPD: USB-PD software stack

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UM2546 Demonstration description
29
1.3 STM32G071RB resources
1.3.1 Hardware resources used by the UCPD demonstration
Figure 5. STM32G071RBT hardware blocs used by the UCPD demonstration
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Demonstration description UM2546
10/30 UM2546 Rev 1
1.3.2 Peripherals used by the UCPD demonstration
Figure 6. STM32G071RBT peripherals used by the UCPD demonstration
1.3.3 Interrupts
Table 2 shows all the external interrupts used by the demonstration
Table 1. STM32G071RBT peripherals used by the UCPD demonstration
Peripheral Usage description
SPI LCD is controlled through SPI1. Write accesses to the LCD are performed to display
strings and bitmaps during the UCPD demonstration execution.
GPIO
The GPIO pins connected to the joystick are used to interact with the UCPD
demonstration (e.g. menu navigation).
One GPIO pin is used to detect the door position
Several GPIOs are used to drive some indication LEDs
I2C
I2C1 is used to control 3 different INA230:
– Two INA230 to detect the voltage level on both CC lines
– One INA230 to monitor the voltage and the current on VBUS
UCPD UCPD1 is used to manage the USB Type-C communication over the Type-C port.
DMA DMA is used for ADC conversions.
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Table 2. STM32G071RBT demonstration interrupts usage
Interrupt Usage description
Systick Delay management
EXTI line 0 Joystick SEL (interrupt mode, rising edge)

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29
EXTI line 2 Joystick UP (interrupt mode, rising edge)
EXTI line 3 Joystick DOWN (interrupt mode, rising edge)
EXTI line 7 Joystick RIGHT (interrupt mode, rising edge)
EXTI line 1 Joystick LEFT (interrupt mode, rising edge)
EXTI line 13 Tamper (interrupt mode, rising edge)
DMA1 Channel1 DAC/ADC conversions completion
ADC1_COMP ADC analog watchdogs
UCPD UCPD related interrupts (e.g. Rx message received, Rx ordered set
detected, Transmit message sent, …)
Table 2. STM32G071RBT demonstration interrupts usage (continued)
Interrupt Usage description

Demonstration functional description UM2546
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2 Demonstration functional description
2.1 Demo startup
2.1.1 Normal processing
If the STM32G071B-DISCO is powered from the micro USB, after a board reset, at demo
startup the welcome screen is displayed.
2.2 UCPD demonstration
2.2.1 Mode selection
Depending on the position of the switch, the analyzer may run in two modes:
Figure 7. Mode selection
2.2.2 LED indications
The mode selection is confirmed by the LED LD6:
Figure 8. LED indications

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Table 3. LED assignation
Reference Color Name Function
LD1 Green POWER 5V 5V present onto the board
LD4 Orange SINK mode Attached to a power source
LD5 Orange SOURCE mode Attached to a device as source
LD6 Green SPY mode SPY mode active
LD7 Green CC CC1 active line

Hardware settings UM2546
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3 Hardware settings
On this kit, no particular setting must be configured.
The G0 Discovery kit may be powered on with a micro USB cable, or it may power itself
using the VBUS, when connected to a type C Source.
For detailed information on the hardware part, please check STM32G0 Discovery kit for
USB Type-C™ and Power Delivery user manual (UM2401)
3.1 STM32G071B-DISCO board
The STM32Cube demonstration supports STM32G071RB device and runs on
STM32G071B-DISCO board from STMicroelectronics.
Figure 9. STM32G071B-DISCO top view Figure 10. STM32G071B-DISCO bottom view

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UM2546 Software settings
29
4 Software settings
4.1 Clock Control
STM32G071 internal clocks are derived from the HSI running at 16Mhz.
In this demo application, the various system clocks are configured as follows:
•System clock is set to 64 MHz: the PLL is used as the system clock source.
•HCLK frequency is set to 64 MHz.
4.2 Programming the demonstration
The user may program the demonstration using two methods:
4.2.1 Using Binary file
To program demonstration's binary image into the internal Flash memory, the user may
exercise STM32G071B-DISCO_USBPD_Analyzer.hex file, thanks to ST-Link Utility or
STM32CubeProgrammer.
Please refer to the Binary Resources Demo in the Board web page STM32G071B-DISCO
(https://www.st.com/en/evaluation-tools/stm32g071b-disco.html).
4.2.2 Using preconfigured projects
Select the folder corresponding to the preferred toolchain (MDK-ARM, EWARM or
SW4STM32).
•Open USBPD_Analyzer project and rebuild all sources.
•Load the project image through the debugger.
•Restart the evaluation board (press B1: reset button).

Software description UM2546
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5 Software description
Figure 11. STM32G0 software architecture overview
Following sections detail:
•Application: in charge to initialize demo application, HAL, interrupt handler and launch
the main module
•Middleware: FreeRTOS, USBPD
5.1 Demonstration Application
The application goal is to prepare demonstration startup, by initializing all the HW/SW.
Table below provides a description of all the actions performed by the different functions in
main.c
Table 4. Main application functions description
Functions (Main.c) Description
Main
Initialize the HAL, configure the clock and the power
MOS, depending on the door position, initialize the
responder for the STM32CubeMonitor USB Type-C PD
tool (GUI_Init), start the stack (USBPD_DPM_InitCore),
the UCPD application (USBPD_DPM_UserInit), start the
OS (USBPD_DPM_InitOS), and then start the
demonstration
SystemClock_Config Set the right clocks for flash and RCC

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The file "stm32g0xx_it.c" is also part of the application and is used, as usual, to map the
interrupt vector on the driver HAL driver, depending on the module requirement (for debug
trace, and joystick management)
Main demonstration functionalities are in the file demo_disco.c.
5.2 Application overview
Depending on the door position (GPIO DOOR_SENSE_PIN: PC8), two different sub-
applications may be executed.
In the spy case, USBPD stack is not launched. INA230 is used to know which CC line is
selected for communication, and then decode the messages on it.
In the standalone mode, the full USBPD stack is running.
Table 5. Main applications functions description
Functions (demo_disco.c) Description
DEMO_Manage_spy
This is the main spy function. It gets the VBUS voltage
and current from the INA230, and gets the voltage level of
both CC lines. If the message queue has some messages
to process, Display_add_spymsg is called
DEMO_Manage_event Main function for standalone mode.
Display_add_spymsg
Function goal is to fill the USB PD data structures with the
information received from the CC lines. These structures
are then used by the application, to feed the G0 disco
information display.
DEMO_SPY_Handler
This function is called on any UCPD event thanks to an
interrupt. It posts the USBPD protocol message seen from
the CC lines to a queue. Later, the application reads this
queue and decode the protocol messages. We don’t
decode the message under interrupt state, to be ready as
soon as possible to see the next messages on the CC
lines.
DEMO_InitBSP Initialise the LCD, and the voltage monitoring of VBUS
and CC lines.
Check_cc_attachement Used in case of spy mode: to detect which CC line is used
for power delivery protocol exchanges.
DEMO_PostMMIMessage
Function that posts the joystick press event in a
FreeRTOS queue, thanks to
HAL_GPIO_EXTI_Rising_Callback function.
*_menu_nav
Function that is used to manage the joystick up and down
press to navigate into a specific menu (source power
profiles, sink power profiles, extended capabilities,
command…)
*_menu_exec Function that executes the selected specific action (select
power profile, command…)
Intialize_RX_processing Configures the UCPD IP (DMA, Interrupts) to be ready to
capture UCPD messages.

Software description UM2546
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5.2.1 Spy mode case
In spy mode, the door is open, and the Discovery kit may receive a second plug to spy the
messages exchanges.
In spy mode, the Discovery kit must not interfere with the two type C devices to which it is
connected.
This is why, as soon as open door is detected, T2, T3 and T5 MOSFETs are turned ON.
Door is open, RD56 (5K1 Ohms) is ignored (needed only for standalone mode to be seen as
a sink), and CC1 and CC2 pins are connected from the G0 UCPD IP.
Figure 12. CC lines isolation/pull down
if no micro USB is plugged, as soon as the source device detects the sink device, VBUS is
driven, and the G0 Discovery kit is powered on.
Here are the menus sequence. Details on the menus in following Section 5.2.3
Table 6. Code example: MOSFET control in spy mode
BSP_MOSFET_On(MOSFET_ENCC1);
BSP_MOSFET_On(MOSFET_ENCC2);

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UM2546 Software description
29
Figure 13. Menu sequence in spy mode
5.2.2 Standalone sink case
In standalone mode, the board is in captive cable configuration. Only CC1 line is used for
power delivery protocol exchanges.
In this mode, application may boot from the VBUS provided by the source. So dead battery
indication may be provided and Rd resistors on the CC1 line must be shown.
This is why when the door is closed, the T5 MOSFET is enabled and RD_CC1 signal is
driven so that the resistor R56 is set between CC1_P and GND. See details in Figure 12.
In the standalone spy case, some specific actions may be requested using the joystick
(select the power profile…), thus menus sequence is a little bit different from the one in spy
mode configuration.
Details on the menus in following Section 5.2.3

Software description UM2546
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Figure 14. Menu sequence in standalone sink mode
5.2.3 Demonstration menu details
Figure 15. Welcome screen
When the G0 disco is powered on (if micro USB is plugged or VBUS driven on the type C
cable) this screen is visible.
Figure 16. Attach screen
Whenever a VBUS is present on the type C cable, this information is displayed. Then,
depending on the source capabilities seen, dual role information may be displayed.
Figure 17. PD capability screen
If USBPD protocol exchanges are seen over the CC lines, the power delivery specification
version is displayed. This information may appear in spy mode, even if one device doesn't
support power delivery