mimic poll with IRQ (using C macro)

use.c

 IT_WRAP(uart6_dma_in_progress, HAL_UART_Transmit_IT(&CLI_UART, (uint8_t *)(debug_log_str + debug_log_tail), len));

wrap.h

#define IT_WRAP(v, ...) do { \
  v = 1; \
  do { \
    __VA_ARGS__; \
  } while (0); \
  while (v == 1) { \
    osDelay(0); \
  } \
} while(0);