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Table of Contents

ADT7420 PMOD Temperature Demo

The ADuCM360_demo_adt7420_pmdz is a temperature demo project for the EVAL-ADICUP360 base board with an EVAL-ADT7420-PMDZ PMOD board from Analog Devices, using the GNU ARM Eclipse Plug-ins in Eclipse environment.

General description

This project is an example for how to use EVAL-ADICUP360 board in combination with the EVAL-ADT7420-PMDZ Temperature PMOD.

The ADuCM360_demo_adt7420_pmdz project uses the EVAL-ADT7420-PMDZ which has the ADT7420 0.25 degree accurate digital temperature sensor on board.

The application reads the temperature data from the ADT7420 and displays the temperature in [codes] and [C] on a serial terminal. The temperature data can be changed between 16-bit(0.0078 C/LSB) and 13-bit(0.0625 C/LSB) accurate depending on the resolution needed. The application also prints out the device ID register, which is just a quick and easy check to ensure the reads are working properly.

All the outputs are printed from the UART to the USER USB port using P0.6 and P0.7, and can be read on the PC using a serial terminal program, such as Putty or Tera Term. The user must ensure that the USB cable is connected to the USER USB port in order to read back values in Putty. Also, the user must press the <ENTER> key in order to refresh the results.

Setting up the hardware


  • To program the base board, set the jumpers as shown in the next figure. The important jumpers are highlighted in red.

  • Plug the EVAL-ADT7420-PMDZ PMOD in the EVAL-ADICUP360 base board, via the PMOD_I2C port (P10).
  • Power EVAL-ADICUP360 base board via the Debug USB.


Obtaining the source code


We recommend not opening the project directly, but rather import it into Eclipse and make a local copy in your Eclipse workspace.

To learn how to import the ADuCM360_demo_adt7420_pmdz project form the projects examples in the Git repository, please click on How to import existing projects from the GIT Repository.

The source code and include files of the ADuCM360_demo_adt7420_pmdz can be found on Github:

AduCM360_demo_adt7420_pmdz at Github


Importing the ADuCM360_demo_adt7420_pmdz project


The necessary instructions on how to import ADuCM360_demo_adt7420_pmdz project in your workspace can be found in the section, Import a project into workspace.


Debugging the ADuCM360_demo_adt7420_pmdz project


  • A debug configuration must be set up for this project in order to have the possibility to program and to debug the ADuCM360_demo_adt7420_pmdz project. To do this, follow the instructions from Setting up a Debug Configuration Page.
  • Make sure the target board is connected to the computer (via DEBUG USB) and using the tool bar, navigate to the small Debug icon and select the debugging session you created. The application will programmed and the program execution will stop at the beginning of the main() function.

  • Use step-by-step execution or directly run the program.

After completion of the steps above the program will remain written into the system flash and it will run by default every time the board is powered up.


Project structure


The ADuCM360_demo_adt7420_pmdz project use basic ARM Cortex-M C/C++ Project structure. This project contains: system initialization part - disabling watchdog, setting system clock, enabling clock for peripheral; port configuration for I2C, temperature sensor data; I2C read/write functions; threshold monitoring.

In the src and include folders you will find the source and header files related to adt7420_pmdz application. You can modify those files as appropriate for your application. The Communication.c/h files contain I2C and UART specific data, meanwhile the ADT7420.c/h files contain the temperature information data and threshold registers. Here are parameters you can configure:

  • ADT7420 Configuration Register - ui8configAdt7420 register - Combine any of the following parameters to setup the ADT7420 in the configuration you desire. (ADT7420.c ).
uint8_t ui8configAdt7420 = (FAULT_TRIGGER_4 | CT_PIN_POLARITY | INT_PIN_POLARITY | INT_CT_MODE |CONTINUOUS_CONVERSION_MODE | RESOLUTION_13_BITS);

/**
#define FAULT_TRIGGER_1 - 1 fault reading triggers an interrupt
#define FAULT_TRIGGER_2 - 2 fault readings triggers an interrupt
#define FAULT_TRIGGER_3 - 3 fault readings triggers an interrupt
#define FAULT_TRIGGER_4 - 4 fault readings triggers an interrupt

#define CT_PIN_POLARITY - Critical temp active logic level
#define INT_PIN_POLARITY - Interrupt temp active logic level
#define INT_CT_MODE - Selects comparator or interrupt mode

#define CONTINUOUS_CONVERSION_MODE - Continuous conversion
#define ONE_SHOT_MODE - One shot conversion, then shuts down
#define ONE_SAMPLE_PER_SECOND_MODE - One second between readings
#define SHUTDOWN_MODE - Power down mode activated

#define RESOLUTION_13_BITS - 13-bit Temperature data
#define RESOLUTION_16_BITS - 16-bit Temperature data

**/


  • ADT7420 I2C Address- ADT7420_ADDRESS paramater - value based on the positions on JP1 and JP2 on EVAL-ADT7420-PMDZ (ADT7420.h ):
#define ADT7420_ADDRESS    0x48
  • High Temperature Interrupt - TEMP_HIGH_SETPOINT parameter - value to set the high temperature [C] threshold for the ADT7420 (ADT7420.c ).
#define TEMP_HIGH_SETPOINT             75
  • Low Temperature Interrupt - TEMP_LOW_SETPOINT parameter - value to set the low temperature [C] threshold for the ADT7420 (ADT7420.c ).
#define TEMP_LOW_SETPOINT             0
  • Critical Temperature Interrupt - TEMP_HIGH_SETPOINT parameter - value to set the critical temperature [C] threshold for the ADT7420 (ADT7420.c ).
#define TEMP_CRITICAL_SETPOINT             100
  • Temperature Hysteresis - TEMP_HYSTERSIS_SETPOINT parameter - value to set the hysteresis window for the temperature [C] interrupt for the ADT7420 (prevents false triggering) (ADT7420.c ).
#define TEMP_HYSTERSIS_SETPOINT             5


The system folder contains system related files (try not to change these files):

  • ADuCM360 – contains low levels drivers for ADuCM360 microcontroller.
  • CMSIS – contains files related to ADuCM360 platform, such as: ADuCM360.h (registers definitions), system_ADuCM360.c/h (system clock), vectors_ADuCM360.c (interrupt vector table).
  • cortexm – contains files for system management (start-up, reset, exception handler).


resources/eval/user-guides/eval-adicup360/reference_designs/demo_adt7420.1483473327.txt.gz · Last modified: 03 Jan 2017 20:55 by Brandon Bushey

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