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stm32/boards: Add STM32H747I-DISCO board definition.
Adds support for STM32H747I-DISCO evaluation board with: - STM32H747XI dual-core MCU (Cortex-M7 @ 400MHz + Cortex-M4) - 32MB SDRAM (32-bit bus @ 120MHz) - Dual QSPI flash (2x512Mbit MT25QL512ABB) - USB High-Speed via ULPI PHY (USB3320C-EZK @ 480Mbps) - USART1 console via ST-LINK V3 VCP - 10/100 Ethernet (LAN8742A RMII) - requires hardware modification - microSD card slot (8-bit SDMMC1) - 4 LEDs, 5-position joystick, user button - Arduino Uno v3 headers - PMOD and STMod+ expansion connectors - LCD and camera connectors (DSI/DCMI) - Audio codec (WM8994) - OpenAMP support for M7-M4 communication Software configuration: - RTC uses LSE (32.768kHz crystal on PC14/PC15) - lwIP networking stack with SSL/TLS (mbedTLS with HW acceleration) - exFAT filesystem support - Frozen modules: asyncio, networking, time, senml, logging Known limitations: - Ethernet requires hardware modification (ETH_MDC/SAI4_D1 pin conflict) Signed-off-by: Andrew Leech <[email protected]>
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‎ports/stm32/boards/STM32H747I_DISCO/bdev.c‎

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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2025 Andrew Leech
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "storage.h"
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#include "qspi.h"
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#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
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// Shared cache for QSPI block device
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static mp_spiflash_cache_t spi_bdev_cache;
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#endif
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// External QSPI flash uses hardware QSPI interface
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const mp_spiflash_config_t spiflash_config = {
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.bus_kind = MP_SPIFLASH_BUS_QSPI,
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.bus.u_qspi.data = NULL,
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.bus.u_qspi.proto = &qspi_proto,
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#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
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.cache = &spi_bdev_cache,
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#endif
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};
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spi_bdev_t spi_bdev;

‎ports/stm32/boards/STM32H747I_DISCO/board.json‎

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{
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"deploy": [
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"../deploy.md"
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],
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"docs": "",
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"features": [
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"DAC",
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"Dual-core",
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"Ethernet",
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"External Flash",
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"External RAM",
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"microSD",
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"USB"
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],
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"images": [
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"stm32h747i_disco.jpg"
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],
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"mcu": "stm32h7",
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"product": "Discovery Kit H747I",
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"thumbnail": "",
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"url": "https://www.st.com/en/evaluation-tools/stm32h747i-disco.html",
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"vendor": "ST Microelectronics"
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}

‎ports/stm32/boards/STM32H747I_DISCO/board.md‎

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The Ethernet interface requires a hardware modification due to a pin conflict
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between ETH_MDC (PC1) and the SAI4_D1 digital MEMS microphone. To enable
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Ethernet, the MEMS microphone must be disconnected from PC1. See the
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STM32H747I-DISCO user manual (UM2411) for modification details.
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The board includes additional hardware not currently configured in MicroPython:
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4" LCD touchscreen (DSI), camera connector (DCMI), WM8994 audio codec, and
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digital MEMS microphones.

‎ports/stm32/boards/STM32H747I_DISCO/board_init.c‎

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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2025 Andrew Leech
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/mphal.h"
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#include "storage.h"
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#include "sdram.h"
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void DISCO_board_early_init(void) {
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HAL_InitTick(0);
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}
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void DISCO_board_low_power(int mode) {
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switch (mode) {
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case 0: // Leave stop mode.
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sdram_leave_low_power();
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break;
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case 1: // Enter stop mode.
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sdram_enter_low_power();
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break;
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case 2: // Enter standby mode.
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sdram_enter_power_down();
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break;
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}
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#if MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE == 0
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// Enable QSPI deepsleep for modes 1 and 2
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mp_spiflash_deepsleep(&spi_bdev.spiflash, (mode != 0));
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#endif
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#if defined(M4_APP_ADDR)
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// Signal Cortex-M4 to go to Standby mode.
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if (mode == 2) {
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__HAL_RCC_HSEM_CLK_ENABLE();
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HAL_HSEM_FastTake(0);
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HAL_HSEM_Release(0, 0);
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__HAL_RCC_HSEM_CLK_DISABLE();
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HAL_Delay(100);
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}
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#endif
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}

‎ports/stm32/boards/STM32H747I_DISCO/manifest.py‎

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include("$(PORT_DIR)/boards/manifest.py")
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# Networking
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require("bundle-networking")
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# Utils
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require("time")
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require("senml")
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require("logging")

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