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SD (Secure Digital Memory) card hot plug function realized under MTK6223D platform

A hot-swappable, platform technology, applied in telephone structure, instruments, electrical digital data processing, etc., can solve the problems of mobile phone function discount, slow response speed, lack of competitiveness, etc.

Inactive Publication Date: 2012-05-30
SHANGHAI TRICHEER TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the platform focuses on the low-end market, many commonly used functions have been simplified, especially the support for the camera and SD card has been removed, which has greatly reduced the functions of the mobile phone and lacked competitiveness.
Therefore, using the SPI method or attaching a relatively cheap DSP chip to support these functions came into being. Although there are shortcomings such as slow response speed (especially the SPI simulation method), it can still meet the general use requirements on the whole.
In terms of SD card hot-swapping, because MTK supports its own set of interrupt mechanisms, it is impossible to directly open the corresponding function macro to realize the hot-swapping function under the 6223D platform

Method used

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  • SD (Secure Digital Memory) card hot plug function realized under MTK6223D platform
  • SD (Secure Digital Memory) card hot plug function realized under MTK6223D platform
  • SD (Secure Digital Memory) card hot plug function realized under MTK6223D platform

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Embodiment Construction

[0011] as attached figure 1 and figure 2 Shown, the deck of described SD card is connected to the external interrupt (EINT2) pin (11) of CPU respectively; TF_CMD pin, the CMD pin (21) that the SD card of DSP connects; TF_CLK pin, the CMD pin (21) of DSP's The clock pin (22) connected to the SD card; the TF_DATA pin, the DATA pin (23) connected to the SD card of the DSP; the DATA_OUT pin of the SD card analog SPI bus, connected to the GPIO43_SPI_DI pin (31) of the CPU; The card simulates the CLK pin of the SPI bus, which is connected to the GPIO23_SPI_CLK pin (32) of the CPU; the SD card simulates the DATAIN pin of the SPI bus, which is connected to the GPIO22_SPI_DOUT pin (33) of the CPU; the SD card simulates the CS pin of the SPI bus , connected to the GPIO51_SPI_CS pin (34) of the CPU. When the SD card is not inserted, the pin is pulled up to a high level by default. When an SD card is inserted, it will be grounded and turned to a low level. Using this feature, it can be...

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PUM

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Abstract

The invention discloses an SD (Secure Digital Memory) card hot plug function realized under an MTK6223D platform. A card bed of the SD card is respectively connected to an external interrupt (EINT2) pin of a CPU (Central Processing Unit), a TF_CMD pin, a TF_CLK pin, a TF_DATA pin, a DATA_OUT pin of a SPI (Serial Peripheral Interference) bus simulated by the SD card and a CLK pin of the SPI bus simulated by the SD card, wherein the TF_CMD pin is a CMD pin connected to the SD card of a DSP (Digital Signal Processor); the TF_CLK pin is a clock pin connected to the SD card of the DSP; the TF_DATA pin is a DATA pin connected to the SD card of the DSP; the DATA_OUT pin is connected to a GPIO43_SPI_DI pin of the CPU; and the CLK pin is connected to a GPIO23_SPI_CLK pin of the CPU, the pin is acquiesced in a pull-up high level when the SD card is not inserted to the pin and is earthed to become a low level when the SD card is inserted to the pin. In the invention, SD card hot plug support in SPI and DSP ways under the 6223D platform can be realized.

Description

technical field [0001] The invention relates to realizing the function of hot plugging and unplugging of an SD card on the 6223D platform of MTK, in particular to realizing the function of hot plugging and unplugging on the premise that the platform itself does not support the function of the SD card. Background technique [0002] With the development of mobile communication, the development of mobile phones is also changing with each passing day. The MTK platform occupies a place in the mobile phone market with its advantages of high integration, short development cycle, and low cost, and its MT6223D platform is because the platform is relatively stable and the cost is lower Be the best in the low-end market for its low price. However, since the platform focuses on the low-end market, many commonly used functions have been simplified, especially the support for cameras and SD cards has been removed, which makes the functions of mobile phones greatly reduced and lacks compet...

Claims

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Application Information

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IPC IPC(8): G06F13/40H04M1/02
Inventor 刘震
Owner SHANGHAI TRICHEER TECHNOLOGY CO LTD