bootloader_serial.py 文件源码

def _change_baud_rate (self, baud_rate):
        '''
        If the bootloader on the board supports it and if it succeeds, try to
        increase the baud rate to make everything faster.
        '''
        pkt = struct.pack('<BI', 0x01, baud_rate)
        success, ret = self._issue_command(self.COMMAND_CHANGE_BAUD_RATE, pkt, True, 0, self.RESPONSE_OK, show_errors=False)

        if success:
            # The bootloader is new enough to support this.
            # Increase the baud rate
            self.sp.baudrate = baud_rate
            # Now confirm that everything is working.
            pkt = struct.pack('<BI', 0x02, baud_rate)
            success, ret = self._issue_command(self.COMMAND_CHANGE_BAUD_RATE, pkt, False, 0, self.RESPONSE_OK, show_errors=False)

            if not success:
                # Something went wrong. Go back to old baud rate
                self.sp.baudrate = 115200