RoadTest: Review the 32-bit RISC-V Renesas Fast Prototyping Board FPB-R9A02G021
Author: Unknown
Creation date:
Evaluation Type: Development Boards & Tools
Did you receive all parts the manufacturer stated would be included in the package?: True
What other parts do you consider comparable to this product?: R9A06G150,R9A02G020
What were the biggest problems encountered?: Renesas RISC-V device family is not supported on Ubuntu 22.04 (even though its mentioned) and this is only needed for RT.
Detailed Review:
Thanks for choosing me to review and evaluate the RISC-V Renesas FPB-R9A02G021, which I had received on 20th May 2024.
While writing review for this board, I went into dilemma whether should I go into understanding evaluation boards, installation SDK, preparation of board for projects and basic test or directly upload the projects.
The Renesas make boards on both architectures- RISC-V and ARM, which are both in 32-bit and 64-bit. Renesas has ARM boards like RA ARM which also has Cortex-M MCU. Besides MCU, Renesas also make microprocessors (MPU) like RZ which are also both in 32-bit and 64-bit.
The given board is an entry level board which is 32-bit based on RISC-V architecture.
What is RISC-V and ISA ?
RISC-V is an open standard ISA(instruction set architecture) having load-store architecture based on RISC(Reduced Instruction Set Computer).
The ISA of the development board Renesas FPB-R9A02G021 has following features
Why RISC is named as RISC-V ?
It is named as RISC-V rather than as RISC because it is the fifth generation and there were RISC- I, RISC-II, RISC-III and RISC-IV.
How RISC-V is different than ARM ?
RISC-V being an open-standard is more flexible to customisation while for the same customisation ARM may need additional extension or third-party extension which may or may not have limitations.
With this entry level development board, one can develop applications in
1. Unboxing
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Only 1 board (FPB-R9A02G021), 2 page printed Quick Start Guide which is available online here and 2 page printed information for RoHS. The RoHS Hazardous substance is D010816-24-V0300 and has tables for hazardous substances like lead(Pb), Mercury(Hg), Cadmium (Cd), Hexavalent Chromium(Cr(VI)), Polybrominated biphenyls(PBB), Polybrominated diphenyl ethers(PBDE).
Following things are not provided (Not a drawback)
2. Understanding Evaluation Board Renesas FPB-R9A02G021
This Renesas FPB-R9A02G021 board has R9A02G0214CNE which is 48 pin QFN with 128KB Flash,16KB RAM and 4KB DataFlash.
2.1 ADC
The ADC is 10 channel, 12-bit successive approximation A/D converter.
If the reference voltage is 4.5 to 5.5 V, then the minimum conversion time is 1.33 μs, with clock of 48 MHz.
If the reference voltage is internal, then the minimum sampling time 5 μs, with clock of 48 MHz.
If the clock is 32 MHz, then the minimum conversion time is 2 μs.
2.2 Compact JTAG (cJTAG)
The JTAG is Compact JTAG (cJTAG)
Source : Renesas Electronics
2.3 Temperature Sensor
There is inbuilt temperature sensor which operates at 1.8 to 5.5 V.
2.4 DAC
The DAC is 2 channel and 8-bit, with maximum conversion time of 3 μs. Two channels of this DAC can be used as comparator reference voltage and can be output externally.
2.5 Timer
The timer is 8 channel and 16-bit. The interval timer is 4 channel and 8-bit, where each of the 4 channel is capable of operating independently. For the interval timer, either upper or lower 8-bit timer can be used but with lower 8-bit timer functions like square wave output, external event counter and delay counter can be achieved.
These timers are also used in input pulse interval measurement, One-shot Pulse, PWM (Pulse Width Modulation), upto seven PWM outputs.
The 32-bit interval timer can be made using four 8-bit interval timers.
2.6 IR Receiver
This Renesas Board has IR Receiver TSOP32438 which has carrier frequency of 38 kHz.
P202 (IRQ2_C / RIN0) of the MCU is connected to OUT pin of the IR receiver module and Pmod 2 INT / GPIO (J14-Pin7).
2.7 MCU Boot Mode
There are two operating modes - Single-chip mode and UART (SAU) boot mode. The SAU is Serial Array Unit which is a SAU with up to four serial channels where each channel can achieve 3-wire serial (simplified SPI), UART, and simplified I2C communication.
2.8 Arduino® Interface
The Arduino Interface has four connectors- one connector of 6 pins, one connector of 10 pins, and two connectors of 8 pins. The interface is fully compatible with Arduino® UNO R3.
2.9 Grove® Interface
2.10 Pmod Interface
The FPB-R9A02G021 Fast Prototyping Board has two Pmod connectors, each of 12 pins and is of angle type:
3. Installation SDK
The board can be programmed using any of the three softwares -
If you want to go on this page, click here
3.1 e2 Studio
I will use e2 studio. You can download it from here, which was released on Apr 22, 2024. The compiler with e2 studio is LLVM.
As I am using ubuntu, I have download following file.You can see, the it is approx 1.5 Gb.
I am using the Ubuntu Operating system
Now, run
sudo chmod a+x e2studio_installer-2024-04_linux_host.run
sudo ./e2studio_installer-2024-04_linux_host.run
Following setup emerges
Here,if you click on Lite or Standard, then these windows appears
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Complete the installation. I noticed e2studio donot show option for RISC-V when installer is run on Linux (Ubuntu 22.04 LTS, x64/ARM32/ARM64) but the same installer shows option to install RISC-V in windows(that is when e2 Studio 2024.exe is run on Windows).
I didn't tried Ubuntu older versions like Ubuntu 20 or Ubuntu 18, so don't know whether the installer shows option to install RISC- V Renesas MCUs or not.
One more thing which I noticed, if the same installer is installed without sudo, the front set up appears as in the video of Renesas and similar like windows but still for Ubuntu 22.04, only RISC-V device family do not get displayed (All other devices of Renesas like RA, RZ etc. appears but only except RISC-V) during installation and this is the only RISC-V device needed for the evaluation of this board.
This pop up of 'setup in blue' do not appear if the installer is invoked with sudo on Ubuntu 22.04 but appears without sudo.
3.2 Segger Embedded Studio
As the e2 studio didnt showed option to install RISC-V MCU, I now tried Segger Embedded Studio
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I installed this first and found this also do not show any option for RISC-v, so I installed Embedded Studio for RISC-V (legacy)
3.3 Segger Embedded Studio for RISC-V (legacy)
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The installer available for download is 7.32 but there is update version also
4. Basic Testing of Renesas RISC-V 32-bit
After installation of SDK and soldering breakout pins or Breadboard compatible headers, board looks like this
4.1 Connecting the board to laptop/PC/computer on Ubuntu 22.04
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4.2 Four LEDs
There are four LEDs on the board of which three LEDs are green and one LED is yellow.
Two of the green LEDs are User LEDs. One green LED is Power on Indicator for + 3.3V. The yellow LED is Debug LED and is connected to J-Link Emulator On-Board debugger MCU.
The LED3 is the power on indicator.
4.3 Two Switch
Two switches are there on the board which are miniature, SMD switches. Both these switches are momentary, mechanical push-button type.
S1 is User Switch and S2 is Reset Switch.
4.4 J-Link Configurator v7.96
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4.5 J-Link Commander v7.96
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4.5 J-Link Commander List of Commands
4.5.1 Basic Commands
4.5.2 Configuration of J-Link Commands
4.5.3 Configuration of Target (CPU) Commands
4.5.4 Debugging Commands
4.5.5 Debugging - Memory operation Commands
4.5.6 Debugging - JTAG Commands
4.5.7 Debugging - ICE Commands
4.5.8 STRACE Commands
4.5.9 SWO Commands
4.5.10 Flash programming Commands
4.5.11 Flasher File I/O Commands
4.5.12 Measurement and Test Commands
4.5.13 J-Link Pin Control Commands
4.6 RISC-V Smart Configurator
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5. Project and Coding Structure
Even though I tried Segger Embedded studio and even though e2 Studio installer do not show option to install on Ubuntu, I spent much time on e2 Studio which is an Eclipse-based integrated development environment (IDE) for Renesas microcontrollers. For this I borrowed someone's Laptop which has Microsoft Windows 11 installed.
The compiler for this e2 Studio is LLVM, Low Level Virtual Machine and its logo of LLVM is awesome. This compiler has to be separately installed.
Source : https://llvm.org/Logo.html
The above figure proves I have successfully installed LLVM compiler.
Renesas Eclipse e2 Studio gives two options to make either executable project or library project.
5.1 Executable project
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5.2 Library project
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5.3 Clock
5.4 Interrupts
5.5 Pins
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5.6 Renesas MCU
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5.7 Report Generated
1. Project Information
Project Name: DEMO 1
Output Date: 2024.06.16
2. Board Settings
Selected Board: FPB-R9A02G021 (V1.02)
Selected Device: R9A02G0214CNE (ROM size: 128 KB, RAM size: 16 KB, Pin count: 48)
3. Clock Settings
The table below shows the configured clock values:
Clock Source Source Frequency
IWDTCLK 0.015
BSP_CFG_PCLKB_DIV 0
BSP_CFG_EXTCLK_OPERATION 0
BSP_CFG_OPERATION_MODE 0
BSP_CFG_SUBCLK_MODE 0
BSP_CFG_CLOCK_SOURCE_SEL 0
BSP_CFG_HOCO_OPERATION 1
JTAG 6.25
PCLKB 48
BSP_CFG_EXTCLK_INPUT_JTAG_HZ 6250000
BSP_CFG_CLKOUT_DIV 2
BSP_CFG_SUBCLK_OPERATION 1
BSP_CFG_SUBCLK_MARGIN 0
CACHCLK 48
BSP_CFG_CLKOUT_SEL 0
BSP_CFG_SUBCLK_SEL 0
BSP_CFG_LOCO_OPERATION 0
BSP_CFG_MOCO_OPERATION 0
BSP_CFG_CLKOUT_ENABLE 0
BSP_CFG_EXTAL_HZ 20000000
BSP_CFG_ICLK_DIV 0
CACSCLK 0.032768
ICLK 48
TML32LCLK 0.032768
4. system settings
4.1. On-chip debug setting
On-chip debug setting:
Setting name Value
Debug interface setting cJTAG
5. Software Component Settings
5.1. r_bsp
Version: 1.10
Setting name Value
Startup select Enable (use BSP startup)
Flash Read Protection Access Control Register (FLRPROTAC) Disable
Flash Read Protection Start Address Register (FLRPROTS) 0x000FFFFC
Flash Read Protection End Address Register (FLRPROTE) 0x000FFFFF
OCD/Serial Programmer ID Setting Register 0 value 0xFFFFFFFF
OCD/Serial Programmer ID Setting Register 1 value 0xFFFFFFFF
OCD/Serial Programmer ID Setting Register 2 value 0xFFFFFFFF
OCD/Serial Programmer ID Setting Register 3 value 0xFFFFFFFF
Access Window Start Block Address (FAWS) 0x7FF
Access Window End Block Address (FAWE) 0x7FF
UIDS0 : User ID Setting Register 0 value 0xFFFFFFFF
UIDS1 : User ID Setting Register 1 value 0xFFFFFFFF
UIDS2 : User ID Setting Register 2 value 0xFFFFFFFF
UIDS3 : User ID Setting Register 3 value 0xFFFFFFFF
Data flash memory area access control(DFLEN) Disable
Initialization of peripheral functions by Code Generator/Smart Configurator Enable
API functions(R_BSP_StartClock, R_BSP_StopClock) Disable
API functions(R_BSP_ChangeICLKClockSetting) Disable
Interrupt setting(bsp_mapped_interrupt_open) Disable
Enable user warm start callback (PRE) Unused
User warm start callback function name (PRE) my_sw_warmstart_prec_function
Enable user warm start callback (POST) Unused
User warm start callback function name (POST) my_sw_warmstart_postc_function
Parameter checking Enabled
5.2. Config_PORT
Component: Ports
Use status: Used
Version: 1.0.1
Common settings:
Setting name Value
Wait Cycle Round 1-cycle wait
PORT0:
Setting name Value
PORT0 Uncheck
PORT1:
Setting name Value
PORT1 Check
P100:
Setting name Value
Use status Out
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
Output current 2 mA
Output current triming Level15 (max)
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P101:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P102:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P103:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P104:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P105:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P106:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P107:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P108:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P109:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P110:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
P111:
Setting name Value
Use status Unused
Pull-up Uncheck
N-ch CMOS output
Output 1 Uncheck
When an ELC_PORTx(x=1,2) signal occurs, effect on output No effect
ELC event edge detect Don't care
PORT2:
Setting name Value
PORT2 Uncheck
PORT3:
Setting name Value
PORT3 Uncheck
PORT4:
Setting name Value
PORT4 Uncheck
6. Board Pin Information
The table below lists default board pins:
Pin Number Board Functions
2 XT2
3 XT1
4 VSS
5 VCC
7 P201
8 P202
9 P204
10 P205
11 P206
12 P307
13 MD
14 RES
15 TCKC
16 TMSC
17 TxD0
18 RxD0
19 P304
20 P305
21 P207
22 P306
23 IRQ4
24 P109
25 P100
26 SCK20
27 P110
28 P111
29 SI20
30 SO20
31 SCLA1
32 SDAA1
33 P009
34 RxDA1
35 P104
36 ANI18
37 ANI19
38 P107
39 TxDA1
40 P402
41 TxD1
42 RxD1
43 ANI5
44 ANI4
45 ANI3
46 ANI2
47 AVREFM
48 AVREFP
7. Interrupt Settings
Not configured.
8. Pin Settings
8.1. Pin Number
Pin Number Pin Name Function Direction Remarks Symbolic Name Comments
1 VCL VCL - Read only -
2 XT2 XT2 O - XT2
3 XT1 XT1 I - XT1
4 VSS/AVSS Not assigned None -
5 VCC/AVCC Not assigned None -
6 P200/NMI Not assigned None
7 P201/IRQ3 Not assigned None PMOD1-IO0/INT
8 P202/CLKOUT/RIN0/IRQ2 Not assigned None PMOD2-IO0/INT
9 P204/SCK21/SCL21 Not assigned None PMOD1-IO1/RESET
10 P205/SI21/SDA21 Not assigned None PMOD1-IO2
11 P206/SO21 Not assigned None PMOD1-IO3
12 P307 Not assigned None PMOD2-IO2
13 P203/MD Not assigned None MD
14 RES Not assigned None - ResetSW-S2_ARDUINO-RESET_JlinkOB-RESET
15 P300/EXTAL/TCKC/TI07/TO07/SCK00/SCL00/IRQ0 TCKC I JlinkOB-TCKC
16 P301/TMSC/TI06/TO06/SI00/SDA00/RxD0/IRQ1 TMSC IO JlinkOB-TMSC
17 P302/VCOUT1/TI03/TO03/SCLA0/TxD0/IRQ3 Not assigned None COM_TXD0 JlinkOB(VCOM)-TXD
18 P303/CLKOUT/TI04/TO04/SDAA0/RxD0/IRQ2 Not assigned None COM_RXD0 JlinkOB(VCOM)-RXD
19 P304/SO01/KR00 Not assigned None ARDUINO-D7
20 P305/SI01/SDA01/KR01 Not assigned None ARDUINO-D8
21 P207/SCK01/SCL01/KR02 Not assigned None PMOD2-RTS
22 P306/KR03 Not assigned None PMOD2-IO3
23 P108/IRQ4/KR04 Not assigned None S1 UserSW-S1_PMOD2-CTS/INT
24 P109/IRQ5/KR05 Not assigned None PMOD2-CS/CTS/INT
25 P100/TI05/TO05/SO00/TxD0/IRQ6 P100 O LED2 LED2_ARDUINO-D3/INT/PWM
26 P101/TI02/TO02/SCK20/SCL20/IRQ7 Not assigned None ARDUINO-SCK/D13_PMOD1-SCK/RTS
27 P110/IRQ7 Not assigned None ARDUINO-D2/INT
28 P111/IRQ6 Not assigned None PMOD2-IO1/RESET
29 P102/TI01/TO01/SCLA0/SI20/SDA20/RxD2/IRQ2 Not assigned None ARDUINO-MISO/D12_PMOD1-MISO/RXD
30 P103/TI02/TO02/SDAA0/SO20/TxD2 Not assigned None ARDUINO-MOSI/D11/PWM_PMOD1-MOSI/TXD
31 P011/TI07/TO07/SCLA1/CLKA0 Not assigned None ARDUINO-SCL_GROVE-SCL/AN
32 P010/SDAA1/RxDA0 Not assigned None ARDUINO-SDA_GROVE-SDA/AN
33 P009/TxDA0/SCK10/SCL10 Not assigned None ARDUINO-SS/D10
34 P008/RxDA1/SI10/SDA10 Not assigned None ARDUINO-RX/D0
35 P104/SCK11/SCL11/IVREF1 Not assigned None ARDUINO-D6
36 P105/VCOUT0/RTC1HZ/SI11/SDA11/ANI18 Not assigned None ARDUINO-A4
37 P106/SO11/ANI19/IVCMP0 Not assigned None ARDUINO-A5
38 P107/CACREF/TI03/TO03/IVCMP1 Not assigned None LED1 LED1_ARDUINO-D9/PWM
39 P403/TxDA1/SO10 Not assigned None ARDUINO-TX/D1
40 P402/CLKA1 Not assigned None ARDUINO-D5
41 P001/TI00/TxD1/ANI17/DACOUT1/IRQ5 Not assigned None PMOD2-TXD
42 P000/TO00/RxD1/ANI16/DACOUT0/IVREF0/IRQ6 Not assigned None PMOD2-RXD
43 P007/ANI5/IRQ3 Not assigned None ARDUINO-A3
44 P006/ANI4/IRQ4 Not assigned None ARDUINO-A2
45 P401/ANI3 Not assigned None ARDUINO-A1
46 P400/ANI2 Not assigned None ARDUINO-A0
47 P003/AVREFM/ANI1/IRQ7 Not assigned None GND
48 P002/AVREFP/ANI0 Not assigned None 3V3
6. Playing with Pre-loaded Project
The board Renesas FPB-R9A02G021 comes with a pre-loaded program. So, its easy to test the pre-loaded code. For this simply connect USB cable to PC/Laptop.
I now play with user and reset switches as shown in the below video.
7. Compiling and Building Projects on e2 Studio
I now tried simple project code to see whether it gets compiled using LLVM and generates ELF file or not, which will be used to program the development board Renesas FPB-R9A02G021.
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As the code has no functionality of importance, the programmed or demo projects not shown,
But I showed I did compiled using LLVM and successfully generated file to program Renesas FPB-R9A02G021.
8. Conclusion
This development board fast prototyping board (FPB), FPB-R9A02G021 'Made in Japan' designed by Renesas is an entry level board from Renesas and is a flexible and versatile development board who are beginners. As it requires very less learning curve and has interface of Ardruino, Grove, beginners will find it very useful. This Renesas development board can be interfaced with Arduino Uno connector, fully compatible with Arduino® UNO R3 and Grove(I2C and Analog) connector. Also, there are two Pmod connectors where Pmod 1 has support of SPI, UART and I2C, and Pmod 2 has support of UART and I2C.
The Renesas 'Made in Japan' has done a clever and wise thing by providing these interfaces, which can make it lead other competitors as these require almost 'zero' learning curve and helpful for students who handle mostly Arduino boards.
It would have been better if for the RoadTest, Arduino® UNO R3 could be provided along with Grove and Pmod connectors.
As mentioned, this entry level 32-bit based on RISC-V board can be used to develop various applications which I have even listed above. Those who want more powerful boards can go for 64-bit or ARM or 64-bit RISC-V.
Being an entry level board, the maximum operating frequency is 48 MHz. There is also an IR Receiver Module, inbuilt temperature sensor
The Renesas officially allows three compilers - e2studio which is based on eclipse (and I have used this), IAR Embedded bench but it is evaluation software for 14 days, SEGGER Embedded Studio, and also has RISC-V Smart Configurator. The Segger Embedded Studio has inbuilt toolchain which is GCC but for e2 Studio, the toolchain has to be separately installed.
There are few improvements and bug correction which Renesas will have to do. If e2Studio is used, Renesas RISC-V device family is not supported on Ubuntu 22.04 unlike other devices of Renesas which are supported on Ubuntu 22.04, so I had to borrow laptop which has Microsoft Windows 11.
I m not sure if RISC-V is supported on Ubuntu older versions or not.
Overall, its a flexible product with less learning curve for beginners and novices.
