usart

• usart_9bit_interrupt_transfer
• usart_dma_double_buffer_transfer
• usart_dma_low_power
• usart_dma_rb_transfer
• usart_dma_transfer
• usart_hardware_flow_control
• usart_interrupt
• usart_interrupt_rb_transfer
• usart_interrupt_ring_buffer_transfer
• usart_interrupt_rx_timeout
• usart_interrupt_transfer
• usart_polling
• usart_stress
• sync_transfer
• usart_wakeup_deepsleep