Wiki

Analog Devices Wiki

English
English
简体中文
简体中文
日本語
日本語
Руccкий
Руccкий
no way to compare when less than two revisions

Differences

This shows you the differences between two versions of the page.


Previous revision
Next revision
—university:courses:electronics:m2k-i2c-debug [02 Apr 2019 15:22] – [Scopy Logic Analyzer Configuration] Antoniu Miclaus
Line 1: Line 1:
 +====== Debugging I2C with the ADALM2000 ======
 +
 +===== Objective =====
 +
 +The objective of this tutorial is to use the Logic Analyzer instrument provided by the [[adi>ADALM2000]] (M2K) board and the [[university:tools:m2k:scopy|Scopy]] software toolset to visualize I2C (Inter-Integrated Circuit) transactions between two devices.
 +
 +The [[resources:eval:user-guides:eval-adicup360:reference_designs:demo_adt7420|ADT7420 PMOD Temperature Demo]] project will be used as an example. The project uses the [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/eval-adt7420-pmdz.html|EVAL-ADT7420-PMDZ]] connected to the [[adi>EVAL-ADICUP360]] microcontroller board. The PMOD includes the [[ADI>ADT7420]] high accuracy digital temperature sensor.
 +
 +The Demo application includes a function that reads and displays the temperature data from the ADT7420 and one that reads and displays the ID register data for ADT7420.
 +
 +===== Background ====
 +
 +I2C is a serial protocol for two-wire interface to connect low-speed peripheral integrated circuits like EEPROMs, A/D and D/A converters and other similar peripherals in embedded systems to processors and microcontrollers in short-distance (intra-board communication). 
 +
 +With I2C, you can connect multiple slaves to a single master and you can have multiple masters controlling single, or multiple slaves. This is really useful, for example, when you want to have more than one microcontroller writing data to a single memory card.
 +
 +<WRAP centeralign>{{:university:courses:electronics:i2c_diagram.png?400|}}</WRAP>
 +<WRAP centeralign>Figure 1. I2C master-slave configuration</WRAP>
 +
 +Transmission lines: 
 +  * **SDA (Serial Data)** – line for the master and slave to send and receive data
 +  * **SCL (Serial Clock)** – line that carries the clock signal
 +
 +Being a serial communication protocol, the data is transferred bit by bit along a single wire (the SDA line).
 +
 +I2C is synchronous, therefore the output of bits is synchronized to the sampling of bits by a clock signal shared between the master and the slave. The clock signal is always controlled by the master.
 +
 +The data is transferred in messages composed of multiple frames. Each message has an address frame that contains the binary address of the slave, and one or more data frames. The message also includes start and stop conditions, read/write bits, and ACK/NACK bits between each data frame as presented in Figure 2.
 +
 +<WRAP centeralign>{{:university:courses:electronics:i2c_message.png|}}</WRAP>
 +<WRAP centeralign>Figure 2. I2C message content</WRAP>
 +
 +Message components:
 +  * **Start** - SDA line switches from a high voltage level to a low voltage level before the SCL line switches from high to low.
 +  * **Address Frame** - master indicates the slave to which the message is being sent
 +  * **Read/Write Bit** - bit that indicates if the master is sending (low voltage level) or receiving (high voltage level) data from slave.
 +  * **Data Frame** - 8-bit data passed from master to slave or vice versa, starting with the most significant bit first (MSB)
 +  * **ACK/NACK Bit** - the ACK bit is returned from the receiving device if an address frame or data frame is successfully received.
 +
 +===== Hardware Configuration ====
 +
 +Figure 3. shows the hardware connection between M2K board and EVAL-ADICUP360 + EVAL-ADT7420-PMDZ.
 +
 +<WRAP centeralign>{{:university:courses:electronics:hw_i2c_m2k.png|}}</WRAP>
 +
 +<WRAP centeralign> Figure 3. I2C Debug Hardware Setup </WRAP>
 +
 +The I2C pins are available for monitoring at port PWMH of the EVAL-ADICUP360. 
 +
 +**EVAL-ADICUP360 I2C pin configuration:**
 +Port PWMH:
 +  * Pin9 - SDA
 +  * Pin10 - SCL
 +
 +Port POWER:
 +  * Pin6 - DGND
 +
 +**M2K I2C pin configuration:**
 +  * DIO0 - SCL
 +  * DIO1 - SDA
 +
 +Connect the M2K pins to the EVAL-ADICUP360 as follows: 
 +  * Pin9 - DIO1
 +  * Pin10 - DIO0
 +  * GND - DGND
 +
 +===== Scopy Logic Analyzer Configuration ====
 +
 +Open the Logic Analyzer instrument, select DIO0-DIO1 lines and press the “Group with selected” button. 
 +
 +<WRAP centeralign>{{:university:courses:electronics:i2c_group.png|}}</WRAP>
 +
 +<WRAP centeralign> Figure 3. I2C Group Channels </WRAP>
 +
 +Select the channel group formed and apply the I2C decoder. While the group is selected, open settings menu by pressing the {{:university:courses:electronics:grp_set_butt.png|}} button on the top right side of the user interface. A settings panel will appear for the I2C decoder, allowing the signal-channel configuration and parameters setup.
 +
 +<WRAP centeralign>{{:university:courses:electronics:i2c_grp_settings.png|}}</WRAP>
 +<WRAP centeralign>Figure 4. Group Settings </WRAP>
 +
  
university/courses/electronics/m2k-i2c-debug.txt · Last modified: 03 Jan 2021 22:12 by Robin Getz

Page Tools