PRINTER AND CONTROL METHOD OF A PRINTER

摘要

Whether received data is the header of a print image command is determined in a receive interrupt process. If the received data is the header of a print image command, data transmission is paused. Whether the received data is a header of a print image command that can be transferred by DMA is then determined in a command task. If the received data is a header of a print image command that can be transferred by DMA, a DMA transfer mode is entered and the data transmission pause is cancelled, and the received data is transferred in the DMA transfer mode to a print buffer 42 by DMA.

主权项

1. A printer comprising:
a data storage unit configured to store data received from a host device in a receive buffer in a receive interrupt process; an interrupt evaluation unit configured to determine if the data stored in the receive buffer in the receive interrupt process is a header of a print image command; a data transmission-stop unit configured to pause data transmission by the host device if the header of a print image command is detected in the receive interrupt process; a command interpreter configured to determine in a command task after the receive interrupt process if the data stored in the receive buffer is a header of a print image command that can be transferred by DMA; a mode selector configured to change the data transfer mode from a normal transfer mode to a DMA transfer mode if the command interpreter determines the data is a header of a print image command that can be transferred by DMA; a cancel transmission-stop unit cancels the pause of data transmission by the host device if the command interpreter determines the data is a header of a print image command that can be transferred by DMA; a DMA transfer unit configured to transfer data received from the host device by DMA to a print buffer without storing the received data to the receive buffer when the mode selector has changed the data transfer mode from the normal transfer mode to a DMA transfer mode; and a print unit configured to read the data transferred to the print buffer and print.