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May 19, 2012

Category: Tips

May 8, 2012

Tablet Computers

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The term “Tablet Computer” has become synonymous to Apple’s iPad, however, it must be stressed that “Tablet Computer” refers to the kind of electronic device that has a data input and output on flat information display capability. Equipment that had these functionalities has been around since 1888 but of course these units were bigger and bulkier and were not as versatile as today’s units.

In 1968, tablets that somewhat looked like today’s units were designed and were available to professionals in the academic and research and development industry. However these units were for these users only and were not readily available to the public. In 2000, Microsoft released the Microsoft Tablet PC and this was geared towards the mainstream market with emphasis on those in the business sector. These tablets were not a big hit primarily because of its price and several usability issues. In 2010, Tablet Computers became a by-word in the industry with the release of Apple’s iPad. Following on the iPad’s success, other companies began to develop and market their own versions of tablet computers. Some have tried to up the ante by incorporating features (ie: calling function and flash players) which the iPad does not support.

Tablet computers are readily available from electronics and computer stores in commercial establishments and can be even purchased from online suppliers. When purchasing tablets through the internet, make sure you order it from a reputable supplier. Big-name companies would want to protect their clients by investing in good web hosting services that can provide robust online security. Good web hosts, as determined through the comments and ratings on web hosting user reviews, are able to continuously broadcast websites on the internet and also ensure that confidential client information is not compromised. Host reviews, such as Go Daddy Review, are available on the internet and can be viewed by anyone at anytime.

November 22, 2011

START and STOP conditions on the USB-I2C Bus

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Any USB GPIO-I2C-SPI Adapter begins the transfer of data with the generation of a START condition and ends the transfer with a STOP condition on the USB SPI/I2C/GPIO Bus.

But what happen on the USB I2C SDA line (Serial Data line) and SCL line (Serial Clock line) when the transfer begins and ends?

When a USB I2C master wants to transfer data bits to a USB I2C slave, it generates a START condition. The level of the SDA line alters from HIGH to LOW, while the SCL line remains HIGH, it defines a START condition.

When the USB I2C master has already transmited all data bits, it generates a STOP condition and gives a signal to the USB I2C slave about the end of transaction. The SDA line changes from LOW to HIGH, while the SCL line is HIGH.

Both, START and STOP conditions are always generated by the USB GPIO-I2C-SPI master.

The USB-I2C Bus is consider to be busy after every START condition and free after every STOP condition. The USB SPI/DPIO/I2C Bus is consider to be also busy, if a repeated START condition is generated on the bus. In this case, the START and repeated START conditions are identical.

To discover the STOP and START conditions in easy way, the necessary interfacing hardware is needed to be incorporated in the Bus.

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