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http://180.163.74.83:13000/zhangzhenghao/AP05.git
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407 lines
11 KiB
C
407 lines
11 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <string.h>
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#include <sys/select.h>
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#include "read_utils.h"
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#include "uart_utils.h"
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#define PRINT_TIME_TAG
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#define DBG_TAG "uart_utils"
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#define DBG_LVL DBG_INFO
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#include "debug_print.h"
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#define STRING(x) #x
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#define TO_STRING(x) STRING(x)
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#define S(x) X(x,B##x,TO_STRING(x))
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#define VALID_TERMINAL_SPEED_TABLE \
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S(0)\
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S(50)\
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S(75)\
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S(110)\
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S(134)\
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S(150)\
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S(200)\
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S(300)\
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S(600)\
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S(1200)\
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S(1800)\
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S(2400)\
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S(4800)\
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S(9600)\
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S(19200)\
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S(38400)\
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S(57600)\
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S(115200)\
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S(230400)\
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S(460800)\
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S(500000)\
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S(576000)\
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S(921600)\
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S(1000000)\
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S(1152000)\
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S(1500000)\
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S(2000000)\
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S(2500000)\
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S(3000000)\
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S(3500000)\
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S(4000000)
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/*************************************************************
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* 功能： 打开串口设备文件
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* 参数： 串口设备文件名
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* 返回值： 串口设备文件描述符
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**************************************************************/
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int uart_open(uart_utils_t *uart, char *dev_name)
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{
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int uart_fd;
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uart_fd = open(dev_name, O_RDWR|O_NOCTTY);
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if(uart_fd < 0)
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{
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LOG_I("uart_open FATAL\n");
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}
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if(uart != NULL)
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{
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uart->uart_fd = uart_fd;
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uart->saved = 0;
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}
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return uart_fd;
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}
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void uart_print_attr(struct termios *options)
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{
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int i;
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LOG_I("c_iflag = 0%o\n", options->c_iflag);
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LOG_I("c_oflag = 0%o\n", options->c_oflag);
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LOG_I("c_cflag = 0%o\n", options->c_cflag);
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LOG_I("c_lflag = 0%o\n", options->c_lflag);
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for(i=VINTR;i<=VEOL2;i++)
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{
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LOG_I("c_cc[%d] = %d\n", i, options->c_cc[i]);
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}
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}
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/*************************************************************
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* 功能： 串口默认属性
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* 参数： 无
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* 返回值： 无
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**************************************************************/
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static struct termios *uart_default_attr(void)
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{
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struct termios *options = NULL;
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options = (struct termios *)calloc(1, sizeof(struct termios));
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if(options == NULL)
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{
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LOG_I("uart_default_attr calloc\n");
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goto exit;
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}
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/*
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cfmakeraw() sets the terminal to something like the "raw" mode of the old Version 7 terminal driver:
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input is available character by character, echoing is disabled, and all special processing of terminal input
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and output characters is disabled. The terminal attributes are set as follows:
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*/
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cfmakeraw(options);
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/* Ignore break characters */
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options->c_iflag = IGNBRK;
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/* Enable receiver. */
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options->c_cflag |= CREAD;
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/* Ignore modem status lines. */
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options->c_cflag |= CLOCAL;
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/* Number of bits per byte (mask). */
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options->c_cflag &= ~CSIZE;
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/* Minimum number of bytes read at once [!ICANON]. */
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options->c_cc[VMIN] = 1;
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/* Time-out value (tenths of a second) [!ICANON]. */
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options->c_cc[VTIME] = 0;
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exit:
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return options;
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}
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static inline const char* valid_terminal_speeds(void)
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{
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#define X(x,y,z) "\n\t " z
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return VALID_TERMINAL_SPEED_TABLE;
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#undef X
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}
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static inline speed_t check_speed_parameter(int requested_speed)
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{
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switch(requested_speed)
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{
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#define X(x,y,z) case x: return y;
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VALID_TERMINAL_SPEED_TABLE
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default:
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LOG_I("invalid speed parameters, valid values are %s\n", valid_terminal_speeds());
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return B9600;
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#undef X
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}
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}
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/*************************************************************
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* 功能： 设置串口属性结构体
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* 参数：
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speed：串口波特率（可选2400、4800、9600、115200。可自己酌情修改程序添加支持）
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data_bits：数据位宽（可选5、6、7、8）
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stop_bits：停止位（可选1、2）
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check：奇偶校验位（可选'N'、'O'、'E'；分别应着无奇偶校验、奇校验、偶校验）
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flow_ctrl：硬件流控制（0为OFF，1为ON）
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options：串口属结构体，
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* 返回值： 串口属性结构体
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**************************************************************/
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struct termios *uart_set_attr(
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int speed,
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int data_bits,
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int stop_bits,
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int check,
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int flow_ctrl,
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struct termios *options)
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{
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speed_t baud_rate = 0;
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if(options == NULL)
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{
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options = uart_default_attr();
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}
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switch(data_bits)
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{
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case 5:
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options->c_cflag |= CS5;
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break;
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case 6:
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options->c_cflag |= CS6;
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break;
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case 7:
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options->c_cflag |= CS7;
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break;
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case 8:
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options->c_cflag |= CS8;
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break;
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default:
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options->c_cflag |= CS8;
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break;
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}
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/****************校验位选择****************/
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switch(check)
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{
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case 'O':
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options->c_cflag |= PARENB;//允许输出产生奇偶信息以及输入的奇偶校验
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options->c_cflag |= PARODD;//奇校验
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options->c_iflag |= (INPCK|ISTRIP);//INPCK:启用输入奇偶检测;ISTRIP:去掉第八位(传输时只传7位)
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break;
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case 'E':
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options->c_cflag |= PARENB;//允许输出产生奇偶信息以及输入的奇偶校验
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options->c_cflag &= ~PARODD;//输入和输出是偶校验(ECC)
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options->c_iflag |= (INPCK|ISTRIP);
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break;
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case 'N':
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options->c_cflag &= ~PARENB;//无奇偶校验位
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}
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/****************硬件流控制****************/
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switch (flow_ctrl)
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{
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case '0'://OFF
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options->c_cflag &= ~CRTSCTS;
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options->c_iflag &= ~(IXON|IXOFF|IXANY);
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break;
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case '1'://ON
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options->c_cflag |= CRTSCTS;
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options->c_iflag |= IXON|IXOFF|IXANY;
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break;
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default://OFF
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options->c_cflag &= ~CRTSCTS;
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options->c_iflag &= ~(IXON|IXOFF|IXANY);
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break;
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}
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/****************停止位选择****************/
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if(stop_bits == 1)
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{
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options->c_cflag &= ~CSTOPB;
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}
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else if(stop_bits ==2)
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{
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options->c_cflag |= CSTOPB;
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}
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else
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{
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options->c_cflag &= ~CSTOPB;
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}
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/****************波特率选择****************/
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baud_rate = check_speed_parameter(speed);
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cfsetispeed(options, baud_rate);
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cfsetospeed(options, baud_rate);
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return options;
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}
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/*************************************************************
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* 功能： 设置回显
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* 参数： 串口设备文件名
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echo：回显（0为关，1为开）
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* 返回值： 无
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**************************************************************/
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void uart_set_echo(uart_utils_t *uart, int echo)
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{
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struct termios options;
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if (uart != NULL)
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{
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tcgetattr(uart->uart_fd, &options); /* 获取串口属性 */
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if(echo == 0)
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{
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options.c_lflag &= ~ECHO; /* 关回显 */
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}
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else if(echo == 1)
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{
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options.c_lflag |= ECHO; /* 开回显 */
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}
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else
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{
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options.c_lflag &= ~ECHO; /* 关回显 */
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}
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tcsetattr(uart->uart_fd, TCSANOW, &options); /* 设置串口属性 */
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}
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}
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/*************************************************************
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* 功能： 设置阻塞
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* 参数： 串口设备文件名
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block：阻塞（0为不阻塞，1为阻塞）
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* 返回值： 无
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**************************************************************/
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void uart_set_block(uart_utils_t *uart, int block)
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{
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if (uart != NULL)
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{
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if(block == 0)
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{
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fcntl(uart->uart_fd, F_SETFL, O_NONBLOCK); //read时不阻塞
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}
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else if(block == 1)
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{
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fcntl(uart->uart_fd, F_SETFL, 0); //read时阻塞
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}
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else
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{
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fcntl(uart->uart_fd, F_SETFL, O_NONBLOCK); //read时不阻塞
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}
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}
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}
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/*************************************************************
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* 功能： 串口初始化程序
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* 参数： 串口设备文件名
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speed：串口波特率（可选2400、4800、9600、115200。可自己酌情修改程序添加支持）
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data_bits：数据位宽（可选5、6、7、8）
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stop_bits：停止位（可选1、2）
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check：奇偶校验位（可选'N'、'O'、'E'；分别应着无奇偶校验、奇校验、偶校验）
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flow_ctrl：硬件流控制（0为OFF，1为ON）
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* 返回值： 串口设备文件描述符
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**************************************************************/
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int uart_init(uart_utils_t *uart,
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int speed,
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int data_bits,
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int stop_bits,
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int check,
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int flow_ctrl)
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{
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struct termios *options;
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if(uart == NULL)
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{
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goto exit;
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}
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if(uart->saved == 0)
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{
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uart->saved = 1;
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tcgetattr(uart->uart_fd, &uart->option_back); //保存串口属性
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}
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//uart_print_attr(&uart->option_back);
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options = uart_set_attr(speed, data_bits, stop_bits, check, flow_ctrl, NULL);
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tcflush(uart->uart_fd, TCIFLUSH);
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//uart_print_attr(options);
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tcsetattr(uart->uart_fd, TCSANOW, options); /* 设置串口属性 */
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if(options != &uart->option_back){
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free(options);
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}
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return uart->uart_fd;
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exit:
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return -1;
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}
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/*************************************************************
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* 功能： 串口反初始化程序
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* 参数： 串口设备文件描述符
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* 返回值： 无
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**************************************************************/
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void uart_uninit(uart_utils_t *uart)
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{
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if(uart == NULL)
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{
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return;
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}
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if(uart->saved == 1)
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{
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uart->saved = 0;
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tcgetattr(uart->uart_fd, &uart->option_back); //保存串口属性
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}
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/*关闭串口*/
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close(uart->uart_fd);
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}
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/*************************************************************
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* 功能： 串口发送字符串
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* 参数： uart_fd：串口设备文件描述符
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str：待发送的字符
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* 返回值： 无
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**************************************************************/
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void uart_send_str(int uart_fd, char *str)
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{
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int ret;
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ret = write(uart_fd, str, strlen(str));
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if(ret < 0)
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{
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LOG_I("uart write");
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}
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}
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/*************************************************************
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* 功能： 读一串至截止字符的字符串，在设定的时间内读不到数据则函数返回
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* 参数： uart_fd：串口设备文件描述符
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buffer：存放数据的内存的首地址
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len：存放数据的内存空间的大小
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until：截止字符
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timeout_ms：超时时间(单位：ms)
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* 返回值：
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成功：实际读到的字符数
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失败：-1
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**************************************************************/
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int uart_read_until_char(int uart_fd, char *buffer, int len, unsigned char until, int timeout_ms)
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{
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return read_data_until_char(uart_fd, buffer, len, until, timeout_ms, timeout_ms);
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}
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/*************************************************************
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* 功能： 设定的时间内读取数据
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* 参数： uart_fd：串口设备文件描述符
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buffer：存放数据的内存的首地址
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len：存放数据的内存空间的大小
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timeout_ms：超时时间(单位：ms)
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* 返回值：
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成功：实际读到的字符数
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失败：-1
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**************************************************************/
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int uart_read_until_time(int uart_fd, char *buffer, int len, int timeout_first, int timeout_interval)
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{
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return read_data_until_time(uart_fd, buffer, len, timeout_first, timeout_interval);
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}
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