// *****************************************************************************
/// @brief Função que lê o relógio do sistema
/// @fn u32 ReadSysTime(void)
/// @retval timer @brief Valor do relógio do sistema (ms)
// *****************************************************************************
u32 ReadSysTime(void)
{
u32 u32Temp;
do
u32Temp = u32SystemTime;
while (u32Temp != u32SystemTime);
return u32Temp;
}void TaskMain(void)
{
u32Time = ReadSysTime(); // Read time in milliseconds
/* do rest of the Task... */
}u32 u32Time = 0; /* Variable to hold the time in milliseconds */
u8 u8TimeOverflowCounter = 0; /* Variable to count u32Time overflows */
void TaskMain(void)
{
/* Check if the millisecond counter has overflown */
if (u32Time > ReadSysTime())
{
u8TimeOverflowCounter++;
}
u32Time = ReadSysTime(); // Read time in milliseconds
/* do rest of the Task... */
/* When you send the timestamp, you need to send the overflow counter and the millisecond time value. */
/* And, when you compare time values, you need to take account for the overflow counter also. */
}#include <stdio.h>
#include <stdint.h>
uint32_t time_ms = 0;
uint8_t overflow_counter = 0;
uint64_t combined_timestamp;
int main()
{
/* Give some test values to the variables (hexadecimal values) */
time_ms = 0x00982347;
overflow_counter = 0xAB;
/* Combine the two variables into a single value (at the receiving end) */
combined_timestamp = 0;
combined_timestamp = ((uint64_t)overflow_counter<<32) + time_ms;
/* Print the result in hexadesimal */
printf("combined_timestamp: 0x%lX \n", combined_timestamp);
return 0;
}
