lpcmanager

Modbus scan rate accuracy improved: timer is incremented according to current-old time delta. Current time is acquired with rt_timer_read().
mbmrtu_cleanup();
rt_task_delete(&RTU_UART_task);
rt_task_join(&RTU_UART_task);
rt_task_delete(&RTU_task);
rt_task_join(&RTU_task);
rt_mutex_delete(&RTU_BuffMutex);
gpio_close(RTU_GPIO_dev);