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Overview Power Industry Serial Device Server Programmable Gateways Serial/Ethernet Gateway XNUT-100 CAN/Ethernet Gateway XNUT-105 Ethernet CPU Boards Shop Information and Support

_RINGBUF Struct Reference [USART Device Driver, USART Device Driver] #include <dev/usart.h> Detailed Description Character device ring buffer structure. Data Fields u_char *volatile  rbf_head   Buffer head pointer. u_char *volatile  rbf_tail   Buffer tail pointer. u_char *  rbf_start   First buffer address. u_char *  rbf_last   Last buffer address. size_t  rbf_siz   Total buffer size. volatile size_t  rbf_cnt   Number of bytes in the buffer. size_t  rbf_lwm   Buffer low watermark. size_t  rbf_hwm   Buffer high watermark. HANDLE  rbf_que   Queue of waiting threads. Field Documentation volatile size_t _RINGBUF::rbf_cnt   Number of bytes in the buffer. Changed by receiver and transmitter interrupts. u_char* volatile _RINGBUF::rbf_head   Buffer head pointer. Changed by the receiver interrupt. size_t _RINGBUF::rbf_hwm   Buffer high watermark. If the number of bytes in the buffer reaches this value, then buffer input is disabled. size_t _RINGBUF::rbf_lwm   Buffer low watermark. If the number of bytes in the buffer reaches this value, then the previously disabled buffer input is enabled again. HANDLE _RINGBUF::rbf_que   Queue of waiting threads. Consuming threads are added to this queue when the buffer is empty. Producing threads are added to this queue when the buffer is full. size_t _RINGBUF::rbf_siz   Total buffer size. Zero, if no buffer available. u_char* volatile _RINGBUF::rbf_tail   Buffer tail pointer. Changed by the transmitter interrupt.

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