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-rw-r--r--platforms/chibios/drivers/usbpd_stm32g4.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/platforms/chibios/drivers/usbpd_stm32g4.c b/platforms/chibios/drivers/usbpd_stm32g4.c
index 0096f22f07..21b8f6db95 100644
--- a/platforms/chibios/drivers/usbpd_stm32g4.c
+++ b/platforms/chibios/drivers/usbpd_stm32g4.c
@@ -22,8 +22,6 @@
// Initialises the USBPD subsystem
__attribute__((weak)) void usbpd_init(void) {
- // Disable dead-battery signals
- PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
// Enable the clock for the UCPD1 peripheral
RCC->APB1ENR2 |= RCC_APB1ENR2_UCPD1EN;
@@ -46,6 +44,11 @@ __attribute__((weak)) void usbpd_init(void) {
CR |= UCPD_CR_ANAMODE | UCPD_CR_CCENABLE_Msk;
// Apply the changes
UCPD1->CR = CR;
+
+ // Disable dead-battery signals only after UCPD1 is configured to ensure
+ // that the transition does not go through any intermediate state without
+ // any pull-down resistance.
+ PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
}
// Gets the current state of the USBPD allowance