mcu.c

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/**
 * @file    mcu.c
 * @author  foxBMS Team
 * @date    2019-02-19 (date of creation)
 * @updated 2022-05-30 (date of last update)
 * @version v1.3.0
 * @ingroup DRIVERS
 * @prefix  MCU
 *
 * @brief   Driver for the MCU module.
 *
 */
 
/*========== Includes =======================================================*/
#include "mcu.h"
 
#include "HL_system.h"
 
/*========== Macros and Definitions =========================================*/
 
/** This is defined in port.c for FreeRTOS.
 * It is named portRTI_CNT0_CPUC0_REG
 * This must be changed to reflect the FreeRTOS configuration
 */
#define MCU_RTI_CNT0_CPUC0_REG (0x00000001U)
 
/** threshold in order to limit the time spent in wait to avoid livelock in wait */
#define MCU_US_WAIT_TIMEOUT (10000U)
 
/*========== Static Constant and Variable Definitions =======================*/
/**
 * @brief   frequency of the FRC0 counter
 * @details refer to data sheet SPNU563A-March 2018 p. 585 formula 23
 */
static const uint32_t mcu_frcClock_Hz = (uint32_t)((RTI_FREQ)*1000000.0f) / ((MCU_RTI_CNT0_CPUC0_REG) + 1u);
 
/*========== Extern Constant and Variable Definitions =======================*/
 
/*========== Static Function Prototypes =====================================*/
 
/*========== Static Function Implementations ================================*/
 
/*========== Extern Function Implementations ================================*/
 
void MCU_Delay_us(uint32_t delay_us) {
    /* AXIVION Routine Generic-MissingParameterAssert: delay_us: parameter accepts whole range */
    /**
     * First the time of one FRC0 increment in microseconds is computed with
     * increment_time = (1/mcu_frcClock_Hz)*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:
     */
    const uint32_t rti_nrOfCounts_us = (uint32_t)(((float)mcu_frcClock_Hz) / 1e6f);
 
    /* Get current value of FRC0 counter */
    const uint32_t startValue = MCU_RTI_CNT0_FRC0_REG;
 
    uint32_t timeOut = 0;
    while (timeOut < MCU_US_WAIT_TIMEOUT) {
        /**
         * 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.
         */
        const uint32_t checkValue = MCU_RTI_CNT0_FRC0_REG;
        if ((checkValue - startValue) >= (delay_us * rti_nrOfCounts_us)) {
            break;
        }
        timeOut++;
    }
}
 
extern uint32_t MCU_GetFreeRunningCount(void) {
    return MCU_RTI_CNT0_FRC0_REG;
}
 
extern uint32_t MCU_ConvertFrcDifferenceToTimespan_us(uint32_t count) {
    /* AXIVION Routine Generic-MissingParameterAssert: count: parameter accepts whole range */
    const uint32_t rti_nrOfCounts_us = (uint32_t)(((float)mcu_frcClock_Hz) / 1e6f);
    return count / rti_nrOfCounts_us;
}
 
/*========== Externalized Static Function Implementations (Unit Test) =======*/