foxBMS - Unit Tests  1.5.0
The foxBMS Unit Tests API Documentation
mcu.c
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41 
42 /**
43  * @file mcu.c
44  * @author foxBMS Team
45  * @date 2019-02-19 (date of creation)
46  * @updated 2023-02-03 (date of last update)
47  * @version v1.5.0
48  * @ingroup DRIVERS
49  * @prefix MCU
50  *
51  * @brief Driver for the MCU module.
52  *
53  */
54 
55 /*========== Includes =======================================================*/
56 #include "mcu.h"
57 
58 #include "HL_system.h"
59 
60 #include <math.h>
61 #include <stdint.h>
62 
63 /*========== Macros and Definitions =========================================*/
64 
65 /** This is defined in port.c for FreeRTOS.
66  * It is named portRTI_CNT0_CPUC0_REG
67  * This must be changed to reflect the FreeRTOS configuration
68  */
69 #define MCU_RTI_CNT0_CPUC0_REG (0x00000001u)
70 
71 /** threshold in order to limit the time spent in wait to avoid livelock in wait */
72 #define MCU_US_WAIT_TIMEOUT (10000u)
73 
74 /*========== Static Constant and Variable Definitions =======================*/
75 /**
76  * @brief frequency of the FRC0 counter
77  * @details refer to data sheet SPNU563A-March 2018 p. 585 formula 23
78  */
79 static const uint32_t mcu_frcClock_Hz = (uint32_t)((RTI_FREQ)*1000000.0f) / ((MCU_RTI_CNT0_CPUC0_REG) + 1u);
80 
81 /*========== Extern Constant and Variable Definitions =======================*/
82 
83 /*========== Static Function Prototypes =====================================*/
84 
85 /*========== Static Function Implementations ================================*/
86 
87 /*========== Extern Function Implementations ================================*/
88 
89 void MCU_Delay_us(uint32_t delay_us) {
90  /* AXIVION Routine Generic-MissingParameterAssert: delay_us: parameter accepts whole range */
91  /**
92  * First the time of one FRC0 increment in microseconds is computed with
93  * increment_time = (1/mcu_frcClock_Hz)*1e6
94  * The 1e6 factor is to get the period in microseconds.
95  *
96  * The number of increments needed to reach 1 microsecond is then
97  * computed with
98  * nr_increments_for_1us = (1us/increment_time)
99  *
100  * To avoid floating point computation problems, the number of
101  * increments needed to reach 1 microsecond is computed at once with:
102  */
103  const uint32_t rti_nrOfCounts_us = (uint32_t)(((float_t)mcu_frcClock_Hz) / 1e6f);
104 
105  /* Get current value of FRC0 counter */
106  const uint32_t startValue = MCU_RTI_CNT0_FRC0_REG;
107 
108  uint32_t timeOut = 0;
109  while (timeOut < MCU_US_WAIT_TIMEOUT) {
110  /**
111  * Poll FRC0 value until the value corresponding to the desired
112  * waiting timing has been reached.
113  * The timeout is to ensure the code does not get trapped here.
114  */
115  const uint32_t checkValue = MCU_RTI_CNT0_FRC0_REG;
116  if ((checkValue - startValue) >= (delay_us * rti_nrOfCounts_us)) {
117  break;
118  }
119  timeOut++;
120  }
121 }
122 
123 extern uint32_t MCU_GetFreeRunningCount(void) {
124  return MCU_RTI_CNT0_FRC0_REG;
125 }
126 
127 extern uint32_t MCU_ConvertFrcDifferenceToTimespan_us(uint32_t count) {
128  /* AXIVION Routine Generic-MissingParameterAssert: count: parameter accepts whole range */
129  const uint32_t rti_nrOfCounts_us = (uint32_t)(((float_t)mcu_frcClock_Hz) / 1e6f);
130  return count / rti_nrOfCounts_us;
131 }
132 
133 extern bool MCU_IsTimeElapsed(uint32_t startCounter, uint32_t timeout_us) {
134  bool retVal = false;
135  uint32_t counter = MCU_GetFreeRunningCount();
136  uint32_t timeDifference_us = MCU_ConvertFrcDifferenceToTimespan_us(counter - startCounter);
137  if (timeDifference_us < timeout_us) {
138  retVal = false;
139  } else {
140  retVal = true;
141  }
142  return retVal;
143 }
144 
145 /*========== Externalized Static Function Implementations (Unit Test) =======*/
146 #ifdef UNITY_UNIT_TEST
147 #endif
uint32_t MCU_GetFreeRunningCount(void)
Get the current value of the Free Running Counter 0 (FRC0)
Definition: mcu.c:123
uint32_t MCU_ConvertFrcDifferenceToTimespan_us(uint32_t count)
Convert the counter value FRC0 to a time in microseconds.
Definition: mcu.c:127
void MCU_Delay_us(uint32_t delay_us)
Wait blocking a certain time in microseconds.
Definition: mcu.c:89
#define MCU_US_WAIT_TIMEOUT
Definition: mcu.c:72
#define MCU_RTI_CNT0_CPUC0_REG
Definition: mcu.c:69
static const uint32_t mcu_frcClock_Hz
frequency of the FRC0 counter
Definition: mcu.c:79
bool MCU_IsTimeElapsed(uint32_t startCounter, uint32_t timeout_us)
Checks if a timeout in microseconds has elapsed.
Definition: mcu.c:133
Headers for the driver for the MCU module.
volatile uint32_t MCU_RTI_CNT0_FRC0_REG
Definition: test_mcu.c:61