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.

Copyright

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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.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_us

time 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.