lpcmanager

Modbus scan rate accuracy improved: timer is incremented according to current-old time delta. Current time is acquired with rt_timer_read().
rt_task_delete(&UART_task);
rt_task_join(&UART_task);
closeserial(UART_fd);
gpio_close(RS485_GPIO_dev);
rt_mutex_delete(&UART_WriteMutex);
rt_mutex_delete(&UART_ReadMutex);