Application Note
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Apr.21.23
RL78/G23
HS300x Sample sketch (Arduino™ sketch)
Introduction
This application note describes how to use the RL78/G23-64p Fast Prototyping Board (FPB) library for
Arduino to display data from the HS3001 sensor on the serial monitor of the Arduino™ IDE.
Target Device
Evaluation board : RL78/G23-64p Fast Prototyping Board
Sensor evaluation board : US082-HS3001EVZ
Trademarks
Arduino is a trademark of Arduino SA.
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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Contents
1. System overview ..................................................................................................................... 3
2. Operation confirmation environment ........................................................................................ 4
3. Build development environment ............................................................................................... 5
3.1 Board connection..................................................................................................................................... 5
3.2 List of pins used ....................................................................................................................................... 6
3.3 Setup of Arduino™ IDE ........................................................................................................................... 7
4. Software ................................................................................................................................ 10
4.1 Overview of sample code ...................................................................................................................... 10
4.2 API functions ......................................................................................................................................... 11
4.2.1 HS300x module ................................................................................................................................... 11
4.2.2 Other APIs ........................................................................................................................................... 13
4.3 Operating procedure of sample sketch ................................................................................................. 14
4.4 Flowchart ............................................................................................................................................... 18
5. Notes ..................................................................................................................................... 19
5.1 COM port is not displayed on the Windows Device Manager ............................................................... 19
5.2 Program is not written correctly to RL78/G23-64p Fast Prototyping Board .......................................... 20
6. Sample Code ......................................................................................................................... 21
7. Reference Documnets ........................................................................................................... 21
Revision History ............................................................................................................................ 22
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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1. System overview
This system is composed of the RL78/G23-64p Fast Prototyping Board (RL78/G23-64p FPB) and the
US082-HS3001EVZ with the humidity and temperature HS3001. Arduino™ IDE is used for creating a
program and writing a program to RL78/G23. The data from the HS3001 is displayed on the serial monitor.
The block configuration of the sample code used in this system is shown below.
Sample (DEMO) Software
HS300x Software
Wire Library
注
Note. This part is provided by the RL78/G23-64p Fast Prototyping Board for Arduino.
Figure 1-1 Block configuration of software
The simple diagram of this system configuration is shown below.
RL78/G23-64p FPB US082-HS3001EVZ
Arduino™ IDE
Figure 1-2 System configuration
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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2. Operation confirmation environment
The operation of the sample code provided by this application note has been tested under the following
conditions.
Table 2-1 Operation confirmation environments (Hardware)
Item
Description
Evaluation board
RL78/G23-64p Fast Prototyping Board – RTK7RLG230CLG000BJ
Sensor evaluation board
US082-HS3001EVZ
Operating Voltage
5V
Table 2-2 Operation confirmation environments (Software)
Item
Description
Version
OS
Windows 10
-
Integrated development environment
Arduino™
IDE
2.0.4
Library
RL78/G23-64p FPB library for Arduino
2.0.0
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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3. Build development environment
How to connect boards and how to set up the Arduino™ IDE are explained.
The Arduino™ IDE 2.0.4 is used in this system. Installation of the Arduino™ IDE 2.0.4 or later is necessary if
it is not installed.
3.1 Board connection
The PC and the RL78/G23-64p FPB are connected via USB as shown in Figure 3-1. The RL78/G23-64p
FPB and the US082-HS3001EVZ are connected via jumper wires.
USB is used for power supply to the RL78/G23-64p FPB in this system. For the power supply, check the
circuit of the RL78/G23-64p FPB by referring to the manual, and set jumpers if required.
In this system, jumpers of the RL78/G23-64p FPB are set as shown in Table 3-1.
Table 3-1 Jumper pins setting of RL78/G23-64p FPB
Function
COM port debugging
5-V power supply
USB (UART / Power Supply)
RL78/G23-64p FPB
SCL
SDA
3
4
5
6
GND
5V
US082-HS3001EVZ
Arduino™ IDE
1
2
3
4
5
6
7
8
9
10
11
12
Figure 3-1 Connection of boards
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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3.2 List of pins used
The pins used in this system are shown below.
Table 3-2 Pins used
Item
Arduino™ signal name
Pin number of MCU
Pin
I2C
SDA
18
SDAA0/P61
SCL
17
SCLA0/P60
VDD
5V
-
-
GND
GND
14
-
For detailed pin descriptions of each board, refer to the following manuals.
RL78/G23-64p Fast Prototyping Board User’s Manual (R20UT4814)
US082-HS3001EVZ Evaluation Board Manual (R36UZ0004)
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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3.3 Setup of Arduino™ IDE
The setup procedure of Arduino™ IDE is explained.
Remark. The setup procedure is almost the same as the procedure explained on the Quick Start Guide :
renesas/Arduino Wiki · GitHub. The sample sketch to flash LED is described on the above site.
Refer to it if required.
1. Start the Arduino™ IDE.
2. Click the [Tools] - [Board] - [Boards Manager…] menu.
Click the [Boards Manager…]
Figure 3-2 Selection of [Boards Manager…]
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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3. Specify “All” at the [Type] and input “RL78” in the textbox. Then, “RL78/G23-64p Fast Prototyping
Board” is displayed. Next, click the [INSTALL]. Version 2.0.0 is used in this sample code.
(2) Input
“RL78
”
(1) Select
“All”
(3) Click “INSTALL”
Figure 3-3 Installation of Board Manager
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4. Select the serial port assigned to the RL78/G23-64p FPB from the [Tools] - [Port] menu.
COM port number can be checked at the Device Manager of Windows.
Select the serial port assigned to RL78/G23-64p FPB
Figure 3-4 Selection of serial port
5. Select the [Tools] - [Board] - [RL78/G23-64p Fast Prototyping Board] - [RL78/G23-64p Fast Prototyping
Board] menu.
Select the [RL78/G23-64p Fast Prototyping Board]
Figure 3-5 Selection of board
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4. Software
4.1 Overview of sample code
This sample code gets the data from the HS300x and calculate them to change to the value of temperature
and humidity.
This sample code is composed of the sample sketch for the Arduino™ IDE and the HS300x module (API for
Arduino). The file structure is shown below.
For details of the HS300x module, refer to the “4.2.1 HS300x module”, for details of the sample sketch, refer
to the “4.3 Operating procedure of sample sketch”.
Sample sketch
Source file containing APIs of HS300x module
Header file containing definitions of HS300x module
Figure 4-1 File structure of sample code
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4.2 API functions
4.2.1 HS300x module
The list of APIs contained in the HS300x module is shown below.
Table 4-1 API list of HS300x module
API function name
Function
int begin()
Measurement preparation
•
Call the initialization function of Wire channel.
• Call the _measurementReq function.
float readTemperature()
Return the value of temperature.
float readHumidity()
Return the value of humidity.
uint8_t _readSensor()
Get the data from HS300x sensor.
int8_t _measurementReq()
Request for measurement
•
Prepare for IIC transition.
• Call the _readSensor function.
The specification of HS300x module’s API functions is shown below.
int begin()
Outline
Call the function of the Wire library to initialize the Wire channel and call the
_measurementReq function of the HS300x module in preparation for the measurement.
Argument
None
Return value
Description
Readout result from sensor
Return value
0x01: Normal end (success)
0x00: Failed of read
0xFF: The read data is an abnormal value.
Data type
uint8_t
float readTemperature()
Outline
Return the value of the temperature if the retune value of the _measurementReq function
is the normal end. Return the “NAN” except the normal end.
Argument
None
Return value
Description
The value of temperature or the “NAN” indicating except the normal end
Retune value
The value of temperature
NAN
Data type
float
float readHumidity()
Outline
Return the value of the humidity if the retune value of the _measurementReq function is
the normal end. Return the “NAN” except the normal end.
Argument
None
Return value
Description
The value of humidity or the “NAN” indicating except the normal end
Retune value
The data of humidity
NAN
Data type
float
Remark. NAN：NaN（Not a Number）
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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uint8_t _readSensor()
Outline
Get the data from HS300x sensor and calculate the value of temperature and humidity
from the raw data.
Argument
None
Return value
Description
Readout result from sensor
Return value
0x01: Normal end (success)
0x00: Failed of read
0xFF: The read data is an abnormal value.
Data type
uint8_t
int8_t _measurementReq()
Outline
To request for the measurement, call the beginTransmission function, the write function,
the endTransmission function of the Wire library and the _readSensor function of the
HS300x module.
Argument
None
Return value
Description
Readout result from sensor
Return value
0x01: Normal end (success)
0x00: Failed of read
0xFF: The read data is an abnormal value.
Data type
uint8_t
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4.2.2 Other APIs
This sample code uses the Wire library for I2C communication and the HardwareSerial (Serial) library in
addition to the HS300x module.
Table 4-2 List of APIs other than HS300x module
API function
Function
Wire.begin(address)
Initialize the Wire library.
In this sample code, connect to the I2C bus as the master.
Wire.beginTransmission(address)
Prepare for sending to the communication partner.
Wire.endTransmission()
Send the sequence to the communication partner to start the
I2C communication.
Wire.requestFrom(address, count)
Send the sequence to the communication partner to read the
data.
Wire.write(value)
Append the data to the end of the transmit buffer.
Wire.read()
Get 1-byte data from the receive buffer.
Serial.begin(speed)
Specify the data transfer speed (bps) of serial communication.
Serial.print(data, format)
Output the data to the serial port.
Serial.println(data, format)
Line feed for each data and output to the serial port.
For API function specifications of each library, refer to the website of Arduino™ and the other.
API List · renesas/Arduino Wiki · GitHub
Wire - Arduino Reference
Serial - Arduino Reference
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4.3 Operating procedure of sample sketch
The operation procedure of this sample sketch is shown below. Before the steps below, setup the Arduino™
IDE in the “3.3 Setup of Arduino™ IDE”.
1. Click the [Sketch] - [Include Library] - [Add .ZIP Library…] menu of the Arduino™ IDE. Then, specify the
sample code zip file (HS300x.zip) and click the [Open].
(1) Click “Add .ZIP Library...”
(2) Specify zip file and ,click “Open”.
Figure 4-2 Include HS300x module
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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2. Select the [File] - [Examples] - [HS300x] - [ReadSensors] menu to open the sample sketch
“ReadSenesors.ino”.
Select “ReadSensors”.
Figure 4-3 Select sample sketch
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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3. Click the [Verify] icon to start compiling the sketch.
Click “Verify” icon to start compiling.
Figure 4-4 Compile sketch
4. After compiling is finished, click the [Upload] icon to write the program to the device.
Click “Upload
” icon to write program to device..
Figure 4-5 Write sketch
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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5. After writing, click the [Serial Monitor] icon to open the serial monitor. Temperature and Humidity are
displayed on the serial monitor every second.
Click “Serial Monitor”.
Serial monitor is displayed.
Figure 4-6 Serial monitor of Arduino™ IDE
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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4.4 Flowchart
The flow of the sample sketch is shown below.
START
Serial.begin(9600)
Serial port initialize finished
HS300x initialize finished
Serial output : Initialisation failure message
temperature =
HS300x.readTemperature()
humidity =
HS300x.readHumidity()
Serial output : temperature, humidity
1 second wait
while(1)
Yes
No
Yes
No
Figure 4-7 Flowchart of sample sketch
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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5. Notes
5.1 COM port is not displayed on the Windows Device Manager
When connecting the PC and the evaluation board (RL78/G23-64p FPB) for the first time, the PC may not
recognize the port and the COM port may not be displayed in Windows Device Manager.
If the COM port is not displayed, install the driver of the USB-to-serial convertor (FT232RQ) from FTDI on the
RL78/G23-64p FPB by the following procedure.
1. Download the latest driver installer for the target OS from FTDI's website and install it.
https://ftdichip.com/drivers/vcp-drivers/
2. After installation, “USB Serial Port (COMx)” is displayed under the “Ports (COM & LPT)” on the Device
Manager. In the following figure, COM5 is the target COM port.
Figure 5-1 Windows Device Manager after installation of device driver
For details of USB-to-serial convector and COM port, refer to “5.11 USB-to-Serial Converter” and “5.12 USB-
to-Serial Converter Reset Header” in RL78/G23-64p Fast Prototyping Board User’s manual.
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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5.2 Program is not written correctly to RL78/G23-64p Fast Prototyping Board
It may not be connected correctly the PC and the RL78/G23-64p FPB even if “USB Serial Port (COMx)” is
displayed. Because the RL78/G23-64p FPB is not recognized correctly.
If the program is not written correctly, double-click the target COM port on Windows Device Manager and
clear the checkbox of [Serial Emulator].
(1) Double
-click target COM.
(2) Click [Advanced] on
[Port Settings] tab.
(3) Clear checkbox.
Figure 5-2 Setting example of target COM
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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6. Sample Code
There is the sample code for this application note.
Sample code can be downloaded from the Renesas Electronics website.
7. Reference Documnets
RL78/G23 User’s Manual: Hardware (R01UH0896)
RL78/G23-64p Fast Prototyping Board User’s Manual (R20UT4814)
HS300x Datasheet (R36DS0010)
US082-HS3001EVZ Evaluation Board Manual (R36UZ0004)
The latest versions can be downloaded from the Renesas Electronics website.
Technical update
The latest versions can be downloaded from the Renesas Electronics website.
All trademarks and registered trademarks are the property of their respective owners.
RL78/G23 HS300x Sample sketch (Arduino™ sketch)
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Revision History
Rev.
Date
Description
Page
Summary
1.00
April. 21, 2023
-
First Edition
General Precautions in the Handling of Microprocessing Unit and Microcontroller
Unit Products
The following usage notes are applicable to all Microprocessing unit and Microcontroller unit products from Renesas. For detailed usage notes on the
products covered by this document, refer to the relevant sections of the document as well as any technical updates that have been issued for the products.
1. Precaution against Electrostatic Discharge (ESD)
A strong electrical field, when exposed to a CMOS device, can cause destruction of the gate oxide and ultimately degrade the device operation. Steps
must be taken to stop the generation of static electricity as much as possible, and quickly dissipate it when it occurs. Environmental control must be
adequate. When it is dry, a humidifier should be used. This is recommended to avoid using insulators that can easily build up static electricity.
Semiconductor devices must be stored and transported in an anti-static container, static shielding bag or conductive material. All test and
measurement tools including work benches and floors must be grounded. The operator must also be grounded using a wrist strap. Semiconductor
devices must not be touched with bare hands. Similar precautions must be taken for printed circuit boards with mounted semiconductor devices.
2. Processing at power-on
The state of the product is undefined at the time when power is supplied. The states of internal circuits in the LSI are indeterminate and the states of
register settings and pins are undefined at the time when power is supplied. In a finished product where the reset signal is applied to the external reset
pin, the states of pins are not guaranteed from the time when power is supplied until the reset process is completed. In a similar way, the states of pins
in a product that is reset by an on-chip power-on reset function are not guaranteed from the time when power is supplied until the power reaches the
level at which resetting is specified.
3. Input of signal during power-off state
Do not input signals or an I/O pull-up power supply while the device is powered off. The current injection that results from input of such a signal or I/O
pull-up power supply may cause malfunction and the abnormal current that passes in the device at this time may cause degradation of internal
elements. Follow the guideline for input signal during power-off state as described in your product documentation.
4. Handling of unused pins
Handle unused pins in accordance with the directions given under handling of unused pins in the manual. The input pins of CMOS products are
generally in the high-impedance state. In operation with an unused pin in the open-circuit state, extra electromagnetic noise is induced in the vicinity of
the LSI, an associated shoot-through current flows internally, and malfunctions occur due to the false recognition of the pin state as an input signal
become possible.
5. Clock signals
After applying a reset, only release the reset line after the operating clock signal becomes stable. When switching the clock signal during program
execution, wait until the target clock signal is stabilized. When the clock signal is generated with an external resonator or from an external oscillator
during a reset, ensure that the reset line is only released after full stabilization of the clock signal. Additionally, when switching to a clock signal
produced with an external resonator or by an external oscillator while program execution is in progress, wait until the target clock signal is stable.
6. Voltage application waveform at input pin
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area between V
IL
(Max.) and V
IH
(Min.) due to noise, for example, the device may malfunction. Take care to prevent chattering noise from entering the device when the
input level is fixed, and also in the transition period when the input level passes through the area between V
IL
(Max.) and V
IH
(Min.).
7. Prohibition of access to reserved addresses
Access to reserved addresses is prohibited. The reserved addresses are provided for possible future expansion of functions. Do not access these
addresses as the correct operation of the LSI is not guaranteed.
8. Differences between products
Before changing from one product to another, for example to a product with a different part number, confirm that the change will not lead to problems.
The characteristics of a microprocessing unit or microcontroller unit products in the same group but having a different part number might differ in terms
of internal memory capacity, layout pattern, and other factors, which can affect the ranges of electrical characteristics, such as characteristic values,
operating margins, immunity to noise, and amount of radiated noise. When changing to a product with a different part number, implement a system-
evaluation test for the given product.
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