Fix panics for UART

- Default rx/tx_buffer_size in uart_driver_install
- Make not covered ResetReason as Unknown

src/reset.rs

@@ -40,11 +40,10 @@ impl From<esp_reset_reason_t> for ResetReason {
             esp_reset_reason_t_ESP_RST_PANIC => Self::Panic,
             esp_reset_reason_t_ESP_RST_INT_WDT => Self::InterruptWatchdog,
             esp_reset_reason_t_ESP_RST_POWERON => Self::PowerOn,
-            esp_reset_reason_t_ESP_RST_UNKNOWN => Self::Unknown,
             esp_reset_reason_t_ESP_RST_BROWNOUT => Self::Brownout,
             esp_reset_reason_t_ESP_RST_TASK_WDT => Self::TaskWatchdog,
             esp_reset_reason_t_ESP_RST_DEEPSLEEP => Self::DeepSleep,
-            _ => unreachable!(),
+            _ => Self::Unknown,
         }
     }
 }

src/uart.rs

@@ -1898,16 +1898,8 @@ fn new_common<UART: Uart>(
     esp!(unsafe {
         uart_driver_install(
             UART::port(),
-            if rx.is_some() {
-                config.rx_fifo_size as _
-            } else {
-                0
-            },
-            if tx.is_some() {
-                config.tx_fifo_size as _
-            } else {
-                0
-            },
+            if rx.is_some() { config.rx_fifo_size } else { UART_FIFO_SIZE * 2 } as _,
+            if tx.is_some() { config.tx_fifo_size } else { UART_FIFO_SIZE * 2 } as _,
             config.queue_size as _,
             queue.map(|q| q as *mut _).unwrap_or(ptr::null_mut()),
             InterruptType::to_native(config.intr_flags) as i32,