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With the recent spread of advanced electronic control systems, the importance of functional safety is increasing in fields such as industrial equipment and robot development. From design to development and evaluation, ensuring compliance with safety standards is a major challenge for developers. Against this backdrop, there is a need for efficient system design that takes functional safety into consideration.
This article explains a configuration example when using the Functional Safety Platform Software (PL-SW) with the Renesas RX65 (RX651 series) microcontroller, using a torque sensor development example using Macnica 's semiconductor strain sensor STREAL. This is ideal for developers and designers who want to efficiently design functional safety-compliant software.
* Torque sensor: A sensor that detects the torque applied to the rotating shaft of a machine or device and converts that value into an electrical signal.
What is Renesas Functional Safety Platform Software (PL-SW)?
PL-SW is functional safety platform software that makes it easy to develop dual-redundant functional safety systems using microcontrollers.
It mainly has the following functions:
1. Microcomputer diagnosis through self-diagnosis and mutual monitoring
2. Scheduler controls execution of user software
3. Partitioning
Figure 1: Overview of self-and mutual-diagnostic functions in a dual-redundant configuration using PL-SW (Source: Renesas Electronics Corporation, "RX Functional Safety Solution Introduction.PDF")
App1: Abnormality monitoring,App2:Torque sensor management section, andApp3:Torque data processing section are user applications that are subject to functional safety.
Figure 2: Software block diagram for torque sensor development
Self-diagnosis and mutual diagnosis configuration
In developing the torque sensor, a double bank configuration is used to implement the firmware (FW) update function.
SCI12 is used for mutual monitoring.
*The configuration definition names in this article have been changed from the actual PL-SW.
ROM diagnostic start address
Because of the double bank configuration, the diagnostic size is set to half of the maximum resource of the RX651 (2MB).
|
Config definition name |
set value |
Diagnostic Size |
|
USER_SETTING_ROM_DIAG_STADDR |
0xFFFE 3000 |
1MB |
Internal RAM diagnostic size
Because of the double bank configuration, the diagnostic size is set to half of the maximum resource of the RX651 (256KB).
|
Config definition name |
set value |
Diagnostic Size |
|
USER_SETTING_INT_RAM_SIZE |
0x0000 2200 |
128KB |
SCI channel for mutual monitoring
Set the peripheral name of the SCI used for mutual monitoring.
|
Config definition name |
set value |
explanation |
|
USER_SETTING_SCI_CHANNEL |
SCI_CH12 |
Use SCI12 |
Mutual monitoring SCI communication baud rate
Set the maximum speed selectable for the RX651 (7.5Mbps).
|
Config definition name |
set value |
explanation |
|
USER_SETTING_SCI_BAUDRATE |
BAUDRATE_7500000 |
7.5Mbps |
Scheduler configuration
If you want to start the application as follows:
Figure 3: Software execution sequence for torque sensor development
User Application Order
Set the user applications in the order you want them to start.
|
Config definition name |
set value |
|
USER_SETTING_USER_APP_SEQUENCE |
APP2, APP2, APP1, APP2, APP2, APP2,APP3, APP2, APP2, APP2, APP3, PLSW |
User Application Window Time
Set the execution time for each user application.
|
Config definition name |
set value |
explanation |
|
USER_SETTING_APP1_WINDOW_TIME |
XXX |
Unit: us |
|
USER_SETTING_APP2_WINDOW_TIME |
YYY |
Unit: us |
|
USER_SETTING_APP3_WINDOW_TIME |
ZZZ |
Unit: us |
|
USER_SETTING_APP4_WINDOW_TIME |
0 |
Unit: us |
Partitioning configuration
App2: Torque sensor management section
App2 has the function to communicate with external devices using SCI 5.
Therefore, in order to access the SCI5 related registers, the permission settings must be enabled.
Figure 4: Functional safety target applications in torque sensor development
MPU access permission area settings
Sets the address range for SCI5 related registers.
|
Config definition name |
set value |
explanation |
|
USER_SETTING_APP2_AREA6_STADDR |
0x0008A0A0ul |
SCI5 register area |
|
USER_SETTING_APP2_AREA6_ENDDDR |
0x0008A0C0ul |
|
|
USER_SETTING_APP2_AREA6_ACCESS_MODE |
RAM_ACCESS |
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