The ADuCM360_demo_cn0357 is a toxic gas(CO) detector demo project for the EVAL-ADICUP360 base board with additional EVAL-CN0357-ARDZ shield, created using the GNU ARM Eclipse Plug-ins in Eclipse environment.
This project is a good example for how to use EVAL-ADICUP360 board in different combinations with various shield boards. It expand the list of possible applications that can be done with the base board.
The ADuCM360_demo_cn0357 project uses the EVAL-CN0357-ARDZ shield which is a single-supply, low noise, portable gas detector circuit using an electrochemical sensor.
The EVAL-CN0357-ARDZ shield circuit provides a potentiostatic circuit for biasing the electrochemical sensor, along with a programmable TIA and 16-bit Sigma-Delta ADC. The TIA converts the small currents passing in the sensor to a voltage that can be read by the ADC. The 16-bit ADC value is received via SPI interface of the EVAL-ADICUP360 board, where the gas concentration is computed.
The ADuCM360_demo_cn0357 application configures the necessary components, processes ADC output value and make all necessary conversions in order to provide the gas concentration. A UART interface (9600 baud rate and 8-bits data length) is used to send the results to terminal window: ADC Data Register codes, ADC Input Voltage volts, and Gas Concentration Parts Per Million(PPM) are the outputs provided in the terminal window.
At the start of the project, the software computes the necessary parameters and configure the digital rheostat(AD5270) of the TIA. The required parameters are the sensor sensitivity and sensor range. These can be modified by changing the values of the constants SENSOR_SENSITIVITY and SENSOR_RANGE found in the CN0357.h header file of the project. See the “Project Structure” section for more details.
Once configuration is complete, the software remains in a loop and continuously reads data from the ADC. Data can be read from a terminal by pressing the <Enter> key on the computer's keyboard.
The following is a list of items needed in order to replicate this demo.
We recommend not opening the project directly, but rather import it into CCES and make a local copy in your workspace.
The source code and include files of the ADuCM360_demo_cn0357 can be found on Github:
CrossCore Embedded Studio Application Source Code:
ADuCM360_demo_cn0357 at Github
For more information on importing, debugging, or other tools related questions, please see the tools user guide.
#define SENSOR_RANGE 2000
#define SENSOR_SENSITIVITY 65
Following is the UART configuration.
Select COM Port Baud rate: 9600 Data: 8 bit Parity: none Stop: 1 bit Flow Control: none
The official tool we promote for use with the EVAL-ADICUP360 is CrossCore Embedded Studio. For more information on downloading the tools and a quick start guide on how to use the tool basics, please check out the Tools Overview page.
For more detailed instructions on importing this application/demo example into the CrossCore Embedded Studios tools, please view our How to import existing projects into your workspace section.
For more detailed instructions on importing this application/demo example into the CrossCore Embedded Studios tools, please view our How to configure the debug session section.
The ADuCM360_demo_cn0357 project use ADuCM36x C/C++ Project structure.
This project contains: system initialization part - disabling watchdog, setting system clock, enabling clock for peripherals; port configuration for SPI1, UART via P0.6/P0.7; SPI, UART read/write functions, AD7790 control, AD5270 control and gas concentration computation.
In the src and include folders you will find the source and header files related to CN0357 software application. The Communication.c/h files contain SPI and UART specific data, the AD7790.c/h files contain the ADC control, the AD5270.c/h files contain the rheostat control and the CN0357.c/h files contain configurations and computations specific to the gas detector application.
The RTE folder contains device and system related files:
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