For some reason SysTick gets freezed in the USART_RxCpltCallback() even when systick priority is lower than USART priority, why? Hi all, how are you?, I'm adapting some libraries for nextion HMI's to use with STM32F4 MCUs, then one of them uses the MCU timer which in my case is systick to determine if time has expired, the function is the following/*
* Receive string data.
*
* @param buffer - save string data.
* @param len - string buffer length.
* @param timeout - set timeout time.
*
* @return the length of string buffer.
*
*/
uint16_t recvRetString(char *buffer, uint32_t len, uint32_t timeout)
{
uint16_t ret = 0;
_Bool str_start_flag = false;
uint8_t cnt_0xff = 0;
char temp[30] = {0};
uint8_t c = 0;
long start;
uint8_t indice = 0;
if(!buffer || len == 0)
{
sprintf(temp, "RecvRetString[%d, %s]\r\n", strlen(temp), temp);
dbSerialPrint((uint8_t *) temp);
return c;
}
start = HAL_GetTick();
while((HAL_GetTick() - start) <= timeout)
{
while(indice < len)
{
c = buffer[indice];
if(str_start_flag)
{
if(0xff == c)
{
cnt_0xff++;
if(cnt_0xff &g
