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AD5162 - Microcontroller No-OS Driver
The AD5162 provides a compact 3 mm x 4.9 mm packaged solution for dual 256 position adjustment applications. This device performs the same electronic adjustment function as a 3-terminal mechanical potentiometer. Available in four different end-to-end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ), this low temperature coefficient device is ideal for high accuracy and stability-variable resistance adjustments. The wiper settings are controllable through the SPI compatible digital interface. The resistance between the wiper and either end point of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC latch.
Operating from a 2.7 V to 5.5 V power supply and consuming less than 6 µA allows the AD5162 to be used in portable battery-operated applications.
The goal of this project (Microcontroller No-OS) is to be able to provide reference projects for lower end processors, which can't run Linux, or aren't running a specific operating system, to help those customers using microcontrollers with ADI parts. Here you can find a generic driver which can be used as a base for any microcontroller platform and also specific drivers for Renesas platforms.
The driver contains two parts:
The Communication Driver has a standard interface, so the AD5162 driver can be used exactly as it is provided.
There are three functions which are called by the AD5162 driver:
_Init() – initializes the communication peripheral.
_Write() – writes data to the device.
_Read() – reads data from the device.
The following functions are implemented in this version of AD5162 driver:
| Function || Description
| unsigned char AD5162_Init(void) || Initialize the communication with the device.
| void AD5162_SendDataWord(unsigned char address, unsigned char data) || Send data to one of the 2 channels available.
Renesas RL78G13 Quick Start Guide
This section contains a description of the steps required to run the AD5162 demonstration project on a Renesas RL78G13 platform.
An EVAL-AD5162SDZ has to be interfaced with the Renesas Demonstration Kit (RDK) for RL78G13:
EVAL-AD5162SDZ A connector Pin SYNC_BF (CS) → YRDKRL78G13 J11 connector Pin 1
EVAL-AD5162SDZ A connector Pin DIN_BF (DIN) → YRDKRL78G13 J11 connector Pin 2
EVAL-AD5162SDZ A connector Pin SCLK_BF (SCLK) → YRDKRL78G13 J11 connector Pin 4
EVAL-AD5162SDZ A connector Pin MUX-A0 (MUX_A0) → YRDKRL78G13 J18 connector Pin 30
EVAL-AD5162SDZ A connector Pin MUX-A1 (MUX_A1) → YRDKRL78G13 J18 connector Pin 29
EVAL-AD5162SDZ A connector Pin MUX-A2 (MUX_A2) → YRDKRL78G13 J18 connector Pin 28
With the Applilet3 for RL78G13 tool the following peripherals have to be configured:
CSI10 (Clocked Serial Interface 10) – For the AD5162 part and the ST7579 LCD
Choose to generate the Transmit/receive function for the CSI10 and configure the interface with the following settings:
Transfer mode setting: Single transfer mode
Data length setting : 8 bits
Transfer direction setting: MSB
Specification of data timing: Type 1
Transfer rate setting – Clock mode: Internal clock (master)
Transfer rate setting – Baudrate: 1000000 (bps)
Interrupt setting – Transfer interrupt priority (INTCSI10): Low
Uncheck the callback functions.
TM00 (Timer 00) – For the DelayMs() function
Configure TM00 as an interval timer:
Interval timer setting - Interval value(16 bits): 1 ms
Interval timer setting - Uncheck Generates INTM00 when counting is started
Interrupt setting - Uncheck End of timer channel 0 count, generate an interrupt (INTM00)
Disable the watchdog timer:
Reference Project Overview
The reference project initializes the device and writes two different values to both channels available on the device.
Software Project Setup
This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RL78G13 for controlling and monitoring the operation of the ADI part.
Two software applications have to be used: Applilet3 for RL78G13 (a tool that automatically generates device drivers for MCU peripheral functions) and IAR Embedded Workbench for Renesas RL78 (the integrated development environment).
Step 1 - Applilet3 for RL78G13
Now the desired peripherals can be configured and the code can be generated. For example, if the clocked serial interface 10 (CSI10) has to be configured, select the Serial peripheral, choose for the Channel 2 of Serial Array Unit 0 (SAU0) the CSI10 interface, Transmit/receive function option and then go to CSI10 tab.
To configure the CSI10
interface for serial transmissions of 8 bits, with MSB
first, with the data captured on clock's rising edge, with a frequency of the clock of 1 MHz
and the idle state high, the settings from the following image have to be made.
Step 2 - IAR Embedded Workbench for Renesas RL78
Renesas RX62N Quick Start Guide
This section contains a description of the steps required to run the AD5162 demonstration project on a Renesas RX62N platform.
An EVAL-AD5162EBZ board has to be interfaced with the Renesas Demonstration Kit (RDK) for RX62N:
EVAL-AD5162SDZ A connector Pin SYNC_BF (CS) → YRDKRX62N J8 connector Pin 15
EVAL-AD5162SDZ A connector Pin DIN_BF (DIN) → YRDKRX62N J8 connector Pin 19
EVAL-AD5162SDZ A connector Pin SCLK_BF (SCLK) → YRDKRX62N J8 connector Pin 20
EVAL-AD5162SDZ A connector Pin MUX-A0 (MUX_A0) → YRDKRX62N J8 connector Pin 17
EVAL-AD5162SDZ A connector Pin MUX-A1 (MUX_A1) → YRDKRX62N J8 connector Pin 25
EVAL-AD5162SDZ A connector Pin MUX-A2 (MUX_A2) → YRDKRX62N J8 connector Pin 26
Reference Project Overview
The reference project:
The reference project initializes the device and continuously writes to one of the two channels available.
Software Project Setup
This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RX62N for controlling and monitoring the operation of the ADI part.
Run the High-performance Embedded Workshop integrated development environment.
A window will appear asking to create or open project workspace. Choose “Create a new project workspace” option and press OK.
From “Project Types” option select “Application”, name the Workspace and the Project “ADIEvalBoard”, select the “RX” CPU family and “Renesas RX Standard” tool chain. Press OK.
The RPDL (Renesas Peripheral Driver Library) has to integrated in the project. Unzip the RPDL files (double-click on the file “RPDL_RX62N.exe”). Navigate to where the RPDL files were unpacked and double-click on the “Copy_RPDL_RX62N.bat” to start the copy process. Choose the LQFP package, type the full path where the project was created and after the files were copied, press any key to close the window.
The new source files have to be included in the project. Use the key sequence Alt, P, A to open the “Add files to project ‘ADIEvalBoard’” window. Double click on the RPDL folder. From the “Files of type” drop-down list, select “C source file (*.C)”. Select all of the files and press Add.
To avoid conflicts with standard project files remove the files “intprg.c” and “vecttbl.c” which are included in the project. Use the key sequence Alt, P, R to open the “Remove Project Files” window. Select the files, click on Remove and press OK.
Next the new directory has to be included in the project. Use the key sequence Alt, B, R to open the “RX Standard Toolchain” window. Select the C/C++ tab, select “Show entries for: Include file directories” and press Add. Select “Relative to: Project directory”, type “RPDL” as sub-directory and press OK.
The library file path has to be added in the project. Select the Link/Library tab, select “Show entries for: Library files” and press Add. Select “Relative to: Project directory”, type “RPDL\RX62N_library” as file path and press OK.
Because the “intprg.c” file was removed the “PIntPrg” specified in option “start” has to be removed. Change “Category” to “Section”. Press “Edit”, select “PIntPRG” and press “Remove”. From this window the address of each section can be also modified. After all the changes are made press OK two times.
Now, the files have to be included in the project. Use the key sequence Alt, P, A
to open the “Add files to project ‘ADIEvalBoard’
” window. Navigate into ADI
folder. From the “Files of type
” drop-down list, select “Project Files
”. Select all the copied files and press Add
Now, the project is ready to be built. Press F7. The message after the Build Process is finished has to be “0 Errors, 0 Warnings”. To run the program on the board, you have to download the firmware into the microprocessor’s memory.