foxBMS
1.1.0
The foxBMS Battery Management System API Documentation
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Driver for the MCU module. More...
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... | |
Driver for the MCU module.
SPDX-License-Identifier: BSD-3-Clause
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Definition in file mcu.c.
#define MCU_RTI_CNT0_CPUC0_REG (0x00000001U) |
#define MCU_US_WAIT_TIMEOUT (10000U) |
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.
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.