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135 lines
4.2 KiB
135 lines
4.2 KiB
/*
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* rs485.h
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*
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* Change Logs:
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* Date Author Notes
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* 2020-06-08 qiyongzhong first version
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* 2020-12-17 qiyongzhong add sample
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* 2020-12-18 qiyongzhong add rs485_send_then_recv
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*/
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#ifndef __DRV_RS485_H__
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#define __DRV_RS485_H__
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#include <rtconfig.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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//#define RS485_USING_TEST //使用测试功能
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//#define RS485_USING_SAMPLE_SLAVE //使用从机示例
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//#define RS485_USING_SAMPLE_MASTER //使用主机示例
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//#define RS485_USING_DMA_RX //使用DMA接收
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//#define RS485_USING_INT_TX //使用中断发送
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//#define RS485_USING_DMA_TX //使用DMA发送
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#ifndef RS485_SW_DLY_US
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#define RS485_SW_DLY_US 0 //发送引脚控制切换延时
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#endif
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#define RS485_TX_COMP_TMO_MAX (3 * RT_TICK_PER_SECOND)//最大DMA传输完成超时
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#define RS485_BYTE_TMO_MIN 2 //最小字节超时
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#define RS485_BYTE_TMO_MAX 200 //最大字节超时
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typedef struct rs485_inst rs485_inst_t;
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/*
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* @brief create rs485 instance dynamically
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* @param serial - serial device name
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* @param baudrate - serial baud rate
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* @param parity - serial parity mode
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* @param pin - mode contrle pin
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* @param level - send mode level
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* @retval instance handle
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*/
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rs485_inst_t * rs485_create(const char *serial, int baudrate, int parity, int pin, int level);
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/*
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* @brief destory rs485 instance created dynamically
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* @param hinst - instance handle
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* @retval 0 - success, other - error
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*/
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int rs485_destory(rs485_inst_t * hinst);
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/*
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* @brief config rs485 params
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* @param hinst - instance handle
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* @param baudrate - baudrate of communication
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* @param databits - data bits, 5~8
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* @param parity - parity bit, 0~2, 0 - none, 1 - odd, 2 - even
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* @param stopbits - stop bits, 0~1, 0 - 1 stop bit, 1 - 2 stop bits
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* @retval 0 - success, other - error
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*/
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int rs485_config(rs485_inst_t * hinst, int baudrate, int databits, int parity, int stopbits);
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/*
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* @brief set wait datas timeout for receiving
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* @param hinst - instance handle
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* @param tmo_ms - receive wait timeout, 0--no wait, <0--wait forever, >0--wait timeout, default = 0
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* @retval 0 - success, other - error
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*/
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int rs485_set_recv_tmo(rs485_inst_t * hinst, int tmo_ms);
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/*
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* @brief set byte interval timeout for receiving
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* @param hinst - instance handle
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* @param tmo_ms - byte interval timeout, default is calculated from baudrate
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* @retval 0 - success, other - error
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*/
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int rs485_set_byte_tmo(rs485_inst_t * hinst, int tmo_ms);
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/*
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* @brief open rs485 connect
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* @param hinst - instance handle
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* @retval 0 - success, other - error
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*/
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int rs485_connect(rs485_inst_t * hinst);
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/*
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* @brief close rs485 connect
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* @param hinst - instance handle
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* @retval 0 - success, other - error
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*/
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int rs485_disconn(rs485_inst_t * hinst);
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/*
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* @brief receive datas from rs485
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* @param hinst - instance handle
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* @param buf - buffer addr
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* @param size - maximum length of received datas
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* @retval >=0 - length of received datas, <0 - error
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*/
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int rs485_recv(rs485_inst_t * hinst, void *buf, int size);
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/*
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* @brief send datas to rs485
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* @param hinst - instance handle
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* @param buf - buffer addr
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* @param size - length of send datas
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* @retval >=0 - length of sent datas, <0 - error
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*/
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int rs485_send(rs485_inst_t * hinst, void *buf, int size);
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/*
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* @brief break rs485 receive wait
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* @param hinst - instance handle
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* @retval 0 - success, other - error
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*/
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int rs485_break_recv(rs485_inst_t * hinst);
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/*
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* @brief send data to rs485 and then receive response data from rs485
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* @param hinst - instance handle
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* @param send_buf - send buffer addr
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* @param send_len - length of send datas
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* @param recv_buf - recv buffer addr
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* @param recv_size - maximum length of received datas
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* @retval >=0 - length of received datas, <0 - error
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*/
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int rs485_send_then_recv(rs485_inst_t * hinst, void *send_buf, int send_len, void *recv_buf, int recv_size);
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#ifdef __cplusplus
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}
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#endif
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#endif
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