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-rw-r--r--ports/stm32/uart.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ports/stm32/uart.c b/ports/stm32/uart.c
index 34d8246d5..cea49f4ba 100644
--- a/ports/stm32/uart.c
+++ b/ports/stm32/uart.c
@@ -1202,3 +1202,5 @@ const mp_irq_methods_t uart_irq_methods = {
.trigger = uart_irq_trigger,
.info = uart_irq_info,
};
+
+MP_REGISTER_ROOT_POINTER(struct _pyb_uart_obj_t *pyb_uart_obj_all[MICROPY_HW_MAX_UART + MICROPY_HW_MAX_LPUART]);