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SoC: stm32c0 support (#3174)

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deps: Use hal_stm32 with stm32c0 USB device fixes.

Pull in ZMK fork of hal_stm32 with USB device driver fixes for stm32c0.

feat: Add nBOOT_SEL bit setup for STM32 G0/C0 targets

Newer STM32 C0 and G0 series SoCs do not by default allow use of the
BOOT0 pin/button to enter the bootloader once something has been flash
to the device, which is a change from previous series, and usually not
what's wanted for keyboards running ZMK. To address this, add some
optional, but default initialization code to check the nBOOT_SEL bit and
override it if necessary to ensure BOOT pin/button functionality.

docs: Extract bootloader config into a dedicated page.

Pull the bootloader intergration options out of the system configuration
page into their own dedicated one.

Co-authored-by: Nicolas Munnich <98408764+nmunnich@users.noreply.github.com>

---------

Co-authored-by: Nicolas Munnich <98408764+nmunnich@users.noreply.github.com>
This commit is contained in:
Pete Johanson
2026-01-07 16:05:13 -07:00
committed by GitHub
parent 43b09e0fae
commit f85ec7e7a2
8 changed files with 106 additions and 8 deletions
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46
app/src/boot/stm32_enforce_nboot_sel.c Normal file
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#include <soc.h>
#include <zephyr/kernel.h>
#include <zephyr/init.h>
#include <zephyr/drivers/flash.h>
#include <zephyr/drivers/flash/stm32_flash_api_extensions.h>
#include <zephyr/storage/flash_map.h>
#include <zephyr/logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
const struct device *flash_dev = FIXED_PARTITION_DEVICE(storage_partition);
static int stm32_enforce_nboot_sel_init(void) {
uint32_t opts = 0;
int ret = 0;
if (!device_is_ready(flash_dev)) {
LOG_ERR("flash dev not ready");
return 0;
}
ret = flash_ex_op(flash_dev, FLASH_STM32_EX_OP_OPTB_READ, (uintptr_t)NULL, &opts);
if (ret < 0) {
LOG_ERR("Failed to read option bytes with flash ext op (%d)\n", ret);
return ret;
}
LOG_DBG("Current option bytes: %02X\n", opts);
if (opts & FLASH_OPTR_nBOOT_SEL) {
WRITE_BIT(opts, FLASH_OPTR_nBOOT_SEL_Pos, false);
LOG_DBG("Writing new option bytes %02X\n", opts);
ret = flash_ex_op(flash_dev, FLASH_STM32_EX_OP_OPTB_WRITE, opts, NULL);
if (ret < 0) {
LOG_ERR("Failed to write new option bytes (%d)", ret);
return ret;
}
}
return 0;
}
SYS_INIT(stm32_enforce_nboot_sel_init, APPLICATION, 10);