QUERY · ISSUE

STM32 H563 I2C TIMINGR Add

openby vvchangningopened 2026-03-16updated 2026-03-16

enhancementport-stm32

Description

Description
The STM32H5 series (e.g., STM32H563/H573) features high-performance I2C peripherals (I2C V2 IP), which utilize the 32-bit I2C_TIMINGR register for baud rate and timing configuration (Standard-mode, Fast-mode, and Fast-mode Plus).

Currently, in ports/stm32/, the preprocessor logic for I2C_V2 and TIMINGR calculation includes families like STM32H7, STM32G0/G4, and STM32WB, but STM32H5 is notably absent. This prevents the driver from correctly initializing the I2C block on H5 hardware.

Verification & Results
I have implemented a patch to include STM32H5 in the I2C V2 logic. Local testing on a H563RI Board demonstrates that the timing calculation is accurate. I have successfully verified stable I2C communication at standard bus speeds, as well as custom configurations up to 1.5 MHz (overclocked Fast-mode Plus), which confirms the flexibility and correctness of the timing logic.

Code Size

No response

Implementation

I hope the MicroPython maintainers or community will implement this feature

Code of Conduct

Yes, I agree

CANDIDATE · ISSUE

H7 I2C4 missing

closedby rolandvsopened 2018-04-09updated 2018-04-10

@iabdalkader

When I added the I2C4 port definition to mpconfigport.h I came across some missing things:

HAL is missing some labels pertaining the I2C4 bus
the I2C.c is missing creation in when making a new object
the I2C.h is missing the I2C4 mention.

Added to mpconfigport.h of boards/NUCLEO_H743ZI:

#define MICROPY_HW_I2C4_SCL         (pin_F14)
#define MICROPY_HW_I2C4_SDA         (pin_F15)

Added to stm32/i2c.h

extern I2C_HandleTypeDef I2CHandle4;

Added to stm32/i2c.c at make_new

        #ifdef MICROPY_HW_I2C4_NAME
      } else if (strcmp(port, MICROPY_HW_I2C4_NAME) == 0) {
            i2c_id = 4;
        #endif

And had to add to STM32H7xx_HAL_Driver/inc/Legacy/stm32_hal_legacy.h

#define __I2C4_CLK_ENABLE __HAL_RCC_I2C4_CLK_ENABLE
#define __I2C4_CLK_SLEEP_DISABLE __HAL_RCC_I2C4_CLK_SLEEP_DISABLE
#define __I2C4_CLK_SLEEP_ENABLE __HAL_RCC_I2C4_CLK_SLEEP_ENABLE
#define __I2C4_FORCE_RESET __HAL_RCC_I2C4_FORCE_RESET
#define __I2C4_RELEASE_RESET __HAL_RCC_I2C4_RELEASE_RESET

For it to compile without errors...