Renesas RH850 Zephyr Support - renesas/zephyr GitHub Wiki
The following content in this page describes current Zephyr support status for Renesas RH850 Automotive MCU family, for detail about RH850 MCUs, please visit RH850 Automotive Microcontrollers (MCUs)
Table of contents
Overview
This page describes the content of Renesas RH850 MCU Zephyr components, restrictions and points for caution. This product is an Beta version of the product under development. Please read the following notes carefully before using this product.
Latest release tag: wip_rh850_260630
System Requirements
The Renesas RH850 MCU is currently supported on Zephyr latest.
Supported Host OS
- Ubuntu version 24.04 LTS and later
- Windows 10 or 11
Development Environments
For development environment setup, please refer to the Getting started.
For getting the Zephyr source code step, please use the following command instead of the default west initialization command to get wip_rh850 repository:
- Replace: west init ~/zephyrproject,
- by: west init -m https://github.com/renesas/zephyr.git --mr wip_rh850
Additional Software Preparation:
- Download and install a release v3.20.2 or newer of IAR toolchain for RH850: https://www.iar.com/embedded-development-tools
- Download and install Renesas Flash Programmer: https://www.renesas.com/en/software-tool/renesas-flash-programmer-programming-gui
NOTE:
- Please make sure that the installed softwares are added into environment PATH
- IAR tool chain is commercial of toolchain suit so please register IAR license before to use it in this product. Please refer below related IAR toolchain:
Work In Progress (WIP) branch
| Branch name | Information |
|---|---|
| ZephyrOs:wip_rh850 | Includes Zephyr OS, device drivers, board support, and related components. |
| hal_renesas:wip_rh850 | Includes the HAL layer of Renesas RH850 Automotive MCU FSP source code |
Supported Device List
| Group name | Number of pins | Chip Part Number/SoC Name |
|---|---|---|
| RH850 U2A16 | 516 | R7F702300EBBG-C |
| RH850 U2A16 | 516 | R7F702300AEBBC-C |
| RH850 U2A16 | 516 | R7F702300BEBBC-C |
| RH850 U2B10 | 468 | R7F70254xFABG-C |
| RH850 U2B10 | 468 | R7F70254xAFABG-C |
| RH850 U2B10 | 292 | R7F70254xAFABB-C |
| RH850 U2C8 | 292 | R7F702600AFABB-C |
| RH850 U2C8 | 292 | R7F702600FABB-C |
Supported Board List
| Board name (Zephyr board name) | Status | Samples and demo Hardware connection |
|---|---|---|
| Y-RH850-U2A-516PIN-PB-T1-V1 (pb_rh850u2a_516pin) | Available on Renesas wip_rh850 branch | RH850-U2A-516PIN Sample and Demo hardware configuration |
| Y-RH850-U2B-292PIN-PB-T1-V1 (pb_rh850u2b_292pin) | Available on Renesas wip_rh850 branch | RH850-U2B-292PIN Sample and Demo hardware configuration |
| Y-RH850-U2B-468PIN-PB-T1-V1 (pb_rh850u2b_468pin) | Available on Renesas wip_rh850 branch | RH850-U2B-468PIN Sample and Demo hardware configuration |
| Y-RH850-U2C-292PIN-PB-T1-V1 (pb_rh850u2c_292pin) | Available on Renesas wip_rh850 branch | RH850-U2C-292PIN Sample and Demo hardware configuration |
HWIP and Driver List
| Renesas HW IP | Mapping to Zephyr | Status | Board |
|---|---|---|---|
| ADCK/ADCJ | ADC | Available on Renesas wip_rh850 branch | All available devices |
| RS-CANFD | CAN | Available on Renesas wip_rh850 branch | All available devices |
| Clock control | Clock Control | Available on Renesas wip_rh850 branch | All available devices |
| OSTM | Counter | Available on Renesas wip_rh850 branch | All available devices |
| KCRC | CRC | Available on Renesas wip_rh850 branch | All available devices |
| DMAC | DMA | Available on Renesas wip_rh850 branch | All available devices |
| Ethernet T1S | Ethernet | Available on Renesas wip_rh850 branch | only RH850 U2C8 |
| Ethernet PHY | Ethernet | Available on Renesas wip_rh850 branch | only RH850 U2C8 |
| External Interrupt | Interrupt Controller | Available on Renesas wip_rh850 branch | All available devices |
| RIIC | I2C | Available on Renesas wip_rh850 branch | only RH850 U2A16/U2B10 |
| I/O Ports | GPIO Pinctrl | Available on Renesas wip_rh850 branch | All available devices |
| OSTM | System Timer | Available on Renesas wip_rh850 branch | All available devices |
| RLIN3 (UART) | UART | Available on Renesas wip_rh850 branch | All available devices |
| RTCA | RTC | Available on Renesas wip_rh850 branch | only RH850 U2C8/U2A16 |
| MSPI | SPI | Available on Renesas wip_rh850 branch | All available devices |
| WDTB | Watchdog | Available on Renesas wip_rh850 branch | All available devices |
| TAUD | PWM | Available on Renesas wip_rh850 branch | All available devices |
Build and Flash guideline
Following steps are required for build and flashing Zephyr binary image to Renesas RH850 MCU U2x board.
Currently RH850 arch hasn't support on Zephyr SDK yet, so we need to setup IAR RH850 toolchain.
Build environment setup:
-
Set Zephyr toolchain variant to IAR:
$ export ZEPHYR_TOOLCHAIN_VARIANT=iar -
Export IAR toolchain PATH for Zephyr build system:
$ export IAR_TOOLCHAIN_PATH=<path/to/your/rh850>e.g
$ export IAR_TOOLCHAIN_PATH=/opt/toolchains/IAR/ewrh850-3.20.2/bin/rh850
Build command:
-
When executing the build command on a different board, replace the board name/SoC name (pb_rh850u2b_292pin/r7f70254xafabb-c) with the corresponding target values.
- Please refer to the Supported Device List table for the list of supported SoC name.
- Please refer to the Supported Board List table for the list of supported Board name.
e.g:
$ west build -b pb_rh850u2b_292pin/r7f70254xafabb-c -p always samples/hello_world -
Once the build is completed successfully, apply the common flash command as described below:
Flash command:
$ west flash -- --tool-opt="-auth id FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF -osc 20“
Samples
Refer to the “RH850 Sample and Demo Hardware Configuration” section in the sidebar for instructions on executing the sample for each board.
Limitations
| No | Item | Description of limitations |
|---|---|---|
| 1 | UART | When running at a baud rate of 1 Mbps, the processing time is slower than the rate at which new bytes are received, causing an overrun error. |
| 2 | ADC | The current implementation supports only the following basic ADC features (applies to both the ADCK and ADCJ drivers): 10-bit and 12-bit unsigned right-aligned raw data acquisition. Default MPX value only. Software-triggered conversion only (no A/D timer, hardware or external trigger). One selected scan group per Zephyr ADC request. CPU-based result read only (no DMA/DTC transfer). No oversampling, differential channels, programmable gain or acquisition-time control. |
| 3 | CAN | The current implementation supports only the following basic CANFD features: Transmit Buffer. Receive Buffer, Receive FIFO, Common FIFO Receive Mode. Internal Loopback and Inter-channel Test Mode. Receive Filter (Acceptance Filter List). Error Bit Detection, Bus Error Warning/Passive and Bus-Off reporting. |
| 4 | PWM | Only PWM Output Function is supported (no input capture, compare or edge detection). Slave channels assigned to the same master share the same PWM period. |
| 5 | I2C | Controller (master) mode only; target (slave) mode is not supported. Supported bus speeds are Standard, Fast and Fast-plus; High-speed mode is not supported. Transfers are blocking only (no asynchronous API); no bus-recovery support. |
Next Release
| Relase version | Relase date | Release Scope |
|---|---|---|
| Beta2 release | Oct 31 2026 | (Subject to be changed) I2S, PWM3P, Ethernet TSN, PSI5, RSENT |