xiaoxiaocheng_plc/users/usart.c

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/****************************************************************************
通讯格式详解D8120
----------------------------------------------------------------------
位号 | 含 义 | 描述
-----------+-------------+--------------------------------------------
b0 | 数据长度 | 0 7位 1 8位
-----------+-------------+--------------------------------------------
b2b1 | 校验方式 | 00不用 01奇校验 11偶校验
-----------+-------------+--------------------------------------------
b3 | 停止位 | 0 1位 1 2位
-----------+-------------+--------------------------------------------
| | 0001300 01114800
b7b6b5b4 | 波特率 | 0100600 10009600
| | 01011200 100119200
| | 01102400
-----------+-------------+--------------------------------------------
b8 | | 0不用 注:无协议通讯专用
-----------+-------------+--------------------------------------------
b9 | | 0不用 同上
-----------+-------------+--------------------------------------------
b12b11b10 | 通讯接口 | 000RS485RS422接口
| | 010 RS232C接口
-----------+-------------+--------------------------------------------
b13 | 求和检查 | 0不加求和码 1自动加上求和码
-----------+-------------+-------------------------------------------
b14 | 协议 | 0无协议通讯 1专用通讯协议
-----------+-------------+--------------------------------------------
b15 | 协议格式 | 0格式1 1格式4
----------------------------------------------------------------------
举例D8120 = 0X4096 通讯波特率是19200
*********************************************************************************/
#include <main.h>
#include "usart.h"
#include "PLC_IO.h"
#include "stm32f10x_dma.h"
extern char tx_data[143]; //发送缓存
extern u16 all_data[16600];