Configuration method and terminal for driving current of cmd pin of sd card

Abstract

The present invention discloses a configuration method for driving current of a CMD pin of an SD card, and a terminal. The configuration method comprises the steps of: configuring the driving current of the CMD pin of the SD card to be maximum when the SD card is detected to be inserted; obtaining a value of a CID register of the SD card, and determining whether driving current configuration of the CMD pin of the CID register value is already present; if the driving current configuration of the CMD pin of the CID register value is present, configuring the CMD pin with the correct driving current; if the driving current configuration of the CMD pin of the CID register value is not present, arranging output level of the CMD pin to be high level, configuring the CMD pin with the current from minimum driving current to maximum driving current until the voltage of the CMD pin is a standard high level voltage, and saving the configured driving current and the CID register value of the SD card. So driving current configuration of the CMD pin is adapted to the actually used SD card, and the problem that the SD card cannot correctly receive commands due to the fact that the high level voltage of the CMD pin is lower as the driving current of the CMD pin is configured to be too low can be prevented.

Description

technical field [0001] The invention relates to the technical field of electronic equipment, in particular to a configuration method and a terminal of an SD card CMD pin driving current. Background technique [0002] For mobile terminals such as mobile phones and tablets, after the SD card is connected to the central processing unit, the central processing unit will send commands to the SD card through the CMD pin, and the driving current configuration of the CMD pin will directly affect the driving current of the CMD pin. Capability, thus affecting the level voltage on the CMD pin, and the impedance of different SD cards is slightly different, if the driving current of the CMD pin is too small, the level voltage on the CMD pin will be low and easy The SD card cannot receive commands correctly, and if the drive current of the CMD pin is too large, the power consumption on the CMD pin will be high and waste electricity. [0003] For example, current mobile terminals generall...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a configuration method and a terminal of the SD card CMD pin drive current, aiming to solve the problems caused by the fixed configuration of the CMD pin drive current in the prior art. The driving current of CMD pin of some SD cards is too small, so that the high level voltage on the CMD pin is too low, which may cause the problem that the SD card cannot receive commands correctly, and it can make the driving current configuration of the CMD pin the same as Compatible with the actual SD card used

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