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[nrf52] Reboot straight into the app on a 2001 baud touch (#19727)

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This commit is contained in:
J. Nick Koston
2026-09-26 20:08:45 +01:00
committed by GitHub
parent abd95c5154
commit dea1200c35
1 changed files with 11 additions and 1 deletions
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esphome/components/nrf52/dfu.cpp
+11 -1
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@@ -14,6 +14,10 @@ static const char *const TAG = "dfu";
static const uint32_t DFU_DBL_RESET_MAGIC = 0x5A1AD5; // SALADS
static const uint8_t DFU_MAGIC_UF2_RESET = 0x57; // Adafruit nRF52 bootloader UF2 magic
static const uint8_t DFU_MAGIC_SKIP = 0x6d; // Adafruit nRF52 bootloader: start the app, skip DFU
// Host-side baud rates that trigger an action; see DeviceFirmwareUpdate::setup().
static const uint32_t DFU_TOUCH_BAUD_RATE = 1200; // reboot into the bootloader (DFU)
static const uint32_t RESET_TOUCH_BAUD_RATE = 2001; // plain reboot back into the application
void DeviceFirmwareUpdate::setup() {
if (this->reset_pin_ != nullptr) {
@@ -21,7 +25,13 @@ void DeviceFirmwareUpdate::setup() {
}
#if defined(CONFIG_CDC_ACM_DTE_RATE_CALLBACK_SUPPORT)
zephyr::global_cdc_acm->add_on_rate_callback([this](const device *, uint32_t rate) {
if (rate == 1200) {
if (rate == RESET_TOUCH_BAUD_RATE) {
// A plain reboot for host tools (a logs view's Reset device): the USB CDC has no
// reset line, and the bootloader, once entered, has no host command back to the app.
NRF_POWER->GPREGRET = DFU_MAGIC_SKIP;
arch_feed_wdt();
App.reboot();
} else if (rate == DFU_TOUCH_BAUD_RATE) {
volatile uint32_t *dbl_reset_mem = (volatile uint32_t *) 0x20007F7C;
(*dbl_reset_mem) = DFU_DBL_RESET_MAGIC;
if (this->reset_pin_ != nullptr) {