Direct memory access transmission control method and apparatus

A direct memory access (DMA) transmission control method, applied to a DMA transmission control apparatus to control data transmission on a DMA channel, data transmitted on the DMA channel comprising data transmitted between an external device and a memory, and the method comprising:

• receiving a DMA transmission request carrying a target DMA task;
• querying a priority of the target DMA task, the priority of the target DMA task being based on an amount of to-be-transmitted data, a lower priority being set for the target DMA task when the target DMA task comprises a smaller amount of to-be-transmitted data, and a higher priority being set for the target DMA task when the target DMA task comprises a larger amount of to-be-transmitted data;
• selecting, from a DMA channel block according to the priority of the target DMA task, a DMA channel corresponding to the priority of the target DMA task as a target channel;
• querying a priority of a DMA task that has occupied the DMA channel when the DMA channel that has been occupied by the DMA task exists in the DMA channel block;
• and
• suspending data transmission of a DMA task whose priority is lower than that of the target DMA task, obtaining target data of the target DMA task, inputting the target data using an input queue of the target channel, and outputting the target data using an output queue of an occupied channel corresponding to the DMA task whose priority is lower than that of the target DMA task when the DMA task whose priority is lower than that of the target DMA task exists in the DMA task that has occupied the DMA channel.

A direct memory access (DMA) transmission control apparatus to control data transmission on a DMA channel, data transmitted on the DMA channel comprising data transmitted between an external device and a memory, and the apparatus comprising:

• a receiver configured to receive a DMA transmission request carrying a target DMA task;
• a processor coupled to the receiver and configured to:
• query a priority of the target DMA task, the priority of the target DMA task being based on an amount of to-be-transmitted data, a lower priority being set for the target DMA task when the target DMA task comprises a smaller amount of to-be-transmitted data, and a higher priority being set for the target DMA task when the tart DMA task comprises a larger amount of to-be-transmitted data;
• select, from a DMA channel block according to the priority of the target DMA task, a DMA channel corresponding to the priority of the target DMA task as a target channel;
• query a task type of a DMA task that has occupied the DMA channel and a task type of the target DMA task when the DMA channel that has been occupied by the DMA task exists in the DMA channel block;
• query a priority of a DMA task whose task type is different from that of the target DMA task when the DMA task whose task type is different from that of the target DMA task exists in the DMA task that has occupied the DMA channel;
• suspend data transmission of a DMA task whose priority is lower than that of the target DMA task when the DMA task whose priority is lower than that of the target DMA task exists in the DMA task whose task type is different from that of the target DMA task;
• and
• a transmitter coupled to the processor and configured to:
• obtain target data of the target DMA task;
• input the target data using an input queue of the target channel;
• and
• output the target data using an output queue of an occupied channel corresponding to the DMA task whose priority is lower than that of the target DMA task.

A direct memory access (DMA) transmission control apparatus to control data transmission on a DMA channel, data transmitted on the DMA channel comprising data transmitted between an external device and a memory, and the apparatus comprising:

• a receiver configured to receive a DMA transmission request carrying a target DMA task;
• a processor coupled to the receiver and configured to:
• query a priority of the target DMA task, the priority of the target DMA task being based on an amount of to-be-transmitted data, a lower priority being set for the target DMA task when the target DMA task comprises a smaller amount of to-be-transmitted data, and a higher priority being set for the target DMA task when the target DMA task comprises a larger amount of to-be-transmitted data;
• select, from a DMA channel block according to the priority of the target DMA task, a DMA channel corresponding to the priority of the target DMA task as a target channel;
• query a priority of a DMA task that has occupied the DMA channel when the DMA channel that has been occupied by the DMA task exists in the DMA channel block;
• and
• suspend data transmission of a DMA task Whose priority is lower than that of the target DMA task when the DMA task whose priority is lower than that of the target DMA task exists in the DMA task that has occupied the DMA channel;
• and
• a transmitter coupled to the processor and configured to:
• obtain target data of the target DMA task;
• input the target data using an input queue of the target channel;
• and
• output the target data using an output queue of an occupied channel corresponding to the DMA task whose priority is lower than that of the target DMA task.