foxBMS - Unit Tests  1.2.1
The foxBMS Unit Tests API Documentation
mcu.c File Reference

Driver for the MCU module. More...

#include "mcu.h"
#include "HL_system.h"
Include dependency graph for mcu.c:

Go to the source code of this file.

Macros

#define MCU_RTI_CNT0_CPUC0_REG   (0x00000001U)
 
#define MCU_US_WAIT_TIMEOUT   (10000U)
 

Functions

void MCU_delay_us (uint32_t delay_us)
 Wait blocking a certain time in microseconds. More...
 

Detailed Description

Driver for the MCU module.

SPDX-License-Identifier: BSD-3-Clause

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Author
foxBMS Team
Date
2019-02-19 (date of creation)
Updated
2021-11-08 (date of last update)
Prefix
MCU

Definition in file mcu.c.

Macro Definition Documentation

◆ MCU_RTI_CNT0_CPUC0_REG

#define MCU_RTI_CNT0_CPUC0_REG   (0x00000001U)

This is defined in port.c for FreeRTOS. It is named portRTI_CNT0_CPUC0_REG This must be changed to reflect the FreeRTOS configuration

Definition at line 65 of file mcu.c.

◆ MCU_US_WAIT_TIMEOUT

#define MCU_US_WAIT_TIMEOUT   (10000U)

threshold in order to limit the time spent in wait to avoid livelock in wait

Definition at line 68 of file mcu.c.

Function Documentation

◆ MCU_delay_us()

void MCU_delay_us ( uint32_t  delay_us)

Wait blocking a certain time in microseconds.

This function uses the Free Running Counter 0 (FRC0) to generate a delay in microseconds. It does not modify anything related to the counter. This counter is already used by FreeRTOS.

Parameters
delay_ustime in microseconds to wait

This is the frequency of the FRC0 counter data sheet SPNU563A-March 2018 p. 585 formula 23

First the time of one FRC0 increment in microseconds is computed with increment_time = (1/rti_clock)*1e6 The 1e6 factor is to get the period in microseconds.

The number of increments needed to reach 1 microsecond is then computed with nr_increments_for_1us = (1us/increment_time)

To avoid floating point computation problems, the number of increments needed to reach 1 microsecond is computed at once with:

Poll FRC0 value until the value corresponding to the desired waiting timing has been reached. The timeout is to ensure the code does not get trapped here.

Definition at line 80 of file mcu.c.