Difference between revisions of "Embedded System I2C Tutorial"
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| + | Socialledge is moving to two portals. | ||
| + | * The Wiki will remain here for general references about the SJ-One board, and to document student reports. | ||
| + | * The bookstack will now be used for SJSU assignments | ||
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| + | [http://books.socialledge.com/books/embedded-drivers-real-time-operating-systems/chapter/lesson-i2c This article has been moved here] | ||
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== Theory of Operation == | == Theory of Operation == | ||
I2C is prounced "eye-squared see". It is also known as "TWI" because of the intial patent issues of this BUS. This is a popular, low throughput (100-1000Khz), half-duplix BUS that only uses two wires regardless of how many devices are on this BUS. Many sensors use this BUS because of its ease of adding to a system. | I2C is prounced "eye-squared see". It is also known as "TWI" because of the intial patent issues of this BUS. This is a popular, low throughput (100-1000Khz), half-duplix BUS that only uses two wires regardless of how many devices are on this BUS. Many sensors use this BUS because of its ease of adding to a system. | ||
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== Assignment == | == Assignment == | ||
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| + | === I2C State Machine Assignment === | ||
| + | Design your I2C state machine. Look at the "Master Write" and "Master Read", and do the following: | ||
| + | |||
| + | *Right underneath the Master State, determine which state the slave will enter when the master is in each of the states | ||
| + | *In each slave state, determine the action you will perform for the transaction | ||
| + | *You can design your own state machine, or augment the existing one, whichever method can yield the maximum clarify for your I2C slave state. | ||
| + | |||
| + | === I2C Code Assignment === | ||
| + | ==== Assignment Outline ==== | ||
| + | <b>This is a group of two assignment; submit one copy of code per team and put down the names of your group members as part of the source code you turn in. Only turn in the new code you added, not the entire file.</b> | ||
| + | * The I2C#2 driver is already implemented and used for on-board sensors. | ||
| + | * Study the existing I2C code: i2c_base.cpp. Please ask any questions if you have any, but the driver was implemented using the state machine diagrams given at the below wikipedia page. | ||
| + | * On your master board, you can just use i2c terminal command to write a register to the other board which is acting as a slave. Hence, you only need to write code on one board (I2C slave board). | ||
| + | |||
| + | ==== Guidelines ==== | ||
| + | Design an I2C slave interface, and use one person's board as MASTER and communicate with the second person's SLAVE board. Here are the guidelines: | ||
Extend the I2C base class to also support slave operation. Test your I2C driver by using one board as a master, and another board as a slave. | Extend the I2C base class to also support slave operation. Test your I2C driver by using one board as a master, and another board as a slave. | ||
# Study <B><CODE>i2c_base.cpp</CODE></B>, particularly the following methods: | # Study <B><CODE>i2c_base.cpp</CODE></B>, particularly the following methods: | ||
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* Follow your diagram and figure out how to make the I2C slave state machine walk through to read and write registers | * Follow your diagram and figure out how to make the I2C slave state machine walk through to read and write registers | ||
<BR/> | <BR/> | ||
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Latest revision as of 20:06, 25 January 2019
Socialledge is moving to two portals.
- The Wiki will remain here for general references about the SJ-One board, and to document student reports.
- The bookstack will now be used for SJSU assignments
This article has been moved here
