%llu 打印为 "lu"（只有字符，没有数字）是否需要调用特殊库？比如像浮点数那样？
if (constx8 == 0) // calculate constants one time.
{
uint64_t num = (((uint64_t)(((uint32_t)(R21 + R22))) * VREFINT_CAL_VREF) * (*VREFINT_CAL_ADDR)) << 8;
uint32_t denom = (uint32_t)4095 * R22;
constx8 = (uint32_t)(num / denom); // 8 times actual value.
if (isDebug(DEBUG_encoder_voltage_calc))
{
char buf[150];
sprintf(buf,"Const calc: num: %llu, denom: %lu, constx8: %lu\r\n", num, denom, constx8);
print_debug_str(buf);
}
}
打印结果为"Const calc: num: lu, denom: 2454134784, constx8: 2646"
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