foxBMS - Unit Tests  1.1.2
The foxBMS Unit Tests API Documentation
mcu.h File Reference

Headers for the driver for the MCU module. More...

#include "general.h"
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Functions

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

Variables

volatile uint32_t MCU_RTI_CNT0_FRC0_REG
 

Detailed Description

Headers for the 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
2019-02-19 (date of last update)
Prefix
MCU

Definition in file mcu.h.

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 Datasheet 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.

Variable Documentation

◆ MCU_RTI_CNT0_FRC0_REG

volatile uint32_t MCU_RTI_CNT0_FRC0_REG
extern

Definition at line 60 of file test_mcu.c.