在V85x上將uart3設(shè)置成普通串口收發(fā)模式

Uart3普通串口收發(fā)設(shè)置

作者@chhjnavy

由于UART0 被設(shè)定為系統(tǒng)dubug 輸出（簡(jiǎn)單來說就是將ttyS0 設(shè)定為console），所以使用UART3 作為普通的串口，進(jìn)行與別的設(shè)備通信。

查找TX/RX pin腳

從圖中可以看出TX = PE12 RX = PE13 。

PE12 PE13 可以通過排插用杜邦線接出，排插電路圖如下：

查看pin腳復(fù)用

記住PE12 PE13 用作UART3-TX UART3-RX 是function7 ，這個(gè)很重要，一會(huì)我們?cè)赽oard.dts 文件中需要用到。

配置設(shè)備樹

設(shè)備樹文件通過of 文件解析出屬性，進(jìn)一步被應(yīng)用（原理此處不再介紹）。

board.dts 路徑：

tina-v853-docker/device/config/chips/v851s/configs/lizard/board.dts

在設(shè)備樹中搜索UART 找到UART3 相關(guān)配置

&uart0 {
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&uart0_pins_active>;
 pinctrl-1 = <&uart0_pins_sleep>;
 status = "okay";
};


&uart1 {
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&uart1_pins_active>;
 pinctrl-1 = <&uart1_pins_sleep>;
 status = "disabled";
};


&uart2 {
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&uart2_pins_active>;
 pinctrl-1 = <&uart2_pins_sleep>;
 status = "disabled";
};


&uart3 {
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&uart3_pins_active>;
 pinctrl-1 = <&uart3_pins_sleep>;
 status = "okay";
};


&pio {
 uart0_pins_active: uart0@0 {
  allwinner,pins = "PH9", "PH10";
  allwinner,function = "uart0";
  allwinner,muxsel = <5>;
  allwinner,drive = <1>;
  allwinner,pull = <1>;
 };


 uart0_pins_sleep: uart0@1 {
  allwinner,pins = "PH9", "PH10";
  allwinner,function = "gpio_in";
  allwinner,muxsel = <0>;
 };


 uart1_pins_active: uart1@0 {
  allwinner,pins = "PG6", "PG7";
  allwinner,function = "uart1";
  allwinner,muxsel = <4>;
  allwinner,drive = <1>;
  allwinner,pull = <1>;
 };


 uart1_pins_sleep: uart1@1 {
  allwinner,pins = "PG6", "PG7";
  allwinner,function = "gpio_in";
  allwinner,muxsel = <0>;
 };


 uart2_pins_active: uart2@0 {
  allwinner,pins = "PA8", "PA9";
  allwinner,function = "uart2";
  allwinner,muxsel = <6>;
  allwinner,drive = <1>;
  allwinner,pull = <1>;
 };


 uart2_pins_sleep: uart2@1 {
  allwinner,pins = "PA8", "PA9";
  allwinner,function = "gpio_in";
  allwinner,muxsel = <0>;
 };


 uart3_pins_active: uart3@0 {
  allwinner,pins = "PE12", "PE13";
  allwinner,function = "uart3";
  allwinner,muxsel = <7>;
  allwinner,drive = <1>;
  allwinner,pull = <1>;
 };


 uart3_pins_sleep: uart3@1 {
  allwinner,pins = "PE12", "PE13";
  allwinner,function = "gpio_in";
  allwinner,muxsel = <0>;
 };

將uart3 設(shè)定為 status = "okay";

將uart3 pin 腳設(shè)為 allwinner,pins = "PE12", "PE13";

將uart3 pin復(fù)用為function7 ：allwinner,muxsel = <7>;

修改完成后，重新編譯img

make -j1 V=s
pack

使用PhoenixSuit燒錄后,通過adb shell 進(jìn)入終端，就可以查看到設(shè)備節(jié)點(diǎn)：/dev/ttyS3 ,通過open 設(shè)備終端，就可以進(jìn)行read write 操作。

進(jìn)行收發(fā)操作

1）寫應(yīng)用程序：

#include    /*標(biāo)準(zhǔn)輸入輸出定義*/
#include   /*標(biāo)準(zhǔn)函數(shù)庫(kù)定義*/
#include   /*Unix標(biāo)準(zhǔn)函數(shù)定義*/
#include  
#include  /*六文件控制定義*/
#include    /*PX終端控制定義*/
#include   
#include 
#include  


enum parameter_type {
  PT_PROGRAM_NAME = 0,
  PT_DEV_NAME,
  PT_CYCLE,
  PT_NUM
};


#define DBG(string, args...) 
  do { 
      printf("%s, %s()%u---",__FILE__,__FUNCTION__,__LINE__); 
      printf(string, ##args); 
      printf("
"); 
  } while (0)




void usage(void) {
  printf("You should input as: 
");
  printf("	 select_test [/dev/name] [Cyclee Cnt]
");
}


int OpenDev(char *name) {
  int fd = open(name, O_RDWR ); 
  if (-1 == fd)
    DBG("Can not OPen(%s)!", name);
  return fd;
}


/*
 * @brief 設(shè)置串口通信速率
 * @param fd 類型 int打開串口的文件句柄長(zhǎng) 
 * @param speed 類型 int 串口速度
 * @return void
*/


void set_speed(int fd, int speed) {


  int i;
  int status;
  struct termios Opt = {0};
  int speed_arr[] = {B230400, B115200, B57600, B38400, B19200, B9600, B4800, B2400, B1200, B300, B38400, B19200, B9600, B4800, B2400, B1200, B300, };
  int name_arr[] = {230400,115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 300, 38400, 19200, 9600, 4800, 2400, 1200, 300, };


  tcgetattr(fd, &Opt);


  for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++) {
 ? ? ? ?if (speed == name_arr[i])
 ? ? ? ? ? ?break;
 ? ?}


 ? ?tcflush(fd, TCIOFLUSH);
 ? ?cfsetispeed(&Opt, speed_arr[i]);
 ? ?cfsetospeed(&Opt, speed_arr[i]);


 ? ?Opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
 ? ?Opt.c_oflag &= ~OPOST; ?/*Output*/


 ? ?status = tcsetattr(fd, TCSANOW, &Opt);
 ? ?if (status != 0) {
 ? ? ? ?DBG("tcsetattr fd");
 ? ? ? ?return;
 ?}
 ?tcflush(fd, TCIOFLUSH);
 }


/**
*@brief ?設(shè)置串口數(shù)據(jù)位，停止位和效驗(yàn)位
*@param fd ?類型 ? ?int 打開的串口文件句柄
*@param ?databits 類 型 ?int 數(shù) 據(jù)位 ?取值 ?為 ?7 或者8
*@param ?stopbits 類 型 ?int 停 止位 ?取值為 ?1 或者2
*@param parity 類型 int 效驗(yàn)類型 取值為N,E,O,,S
 */


int set_Parity(int fd,int databits,int stopbits,int parity) {
 ?struct termios options;


 ? ?if ( tcgetattr( fd,&options) != 0) {
 ? ? ? ?perror("SetupSerial 1");
 ? ? ? ?return -1;
 ? ?}
 ? ?options.c_cflag &= ~CSIZE;
 ? ?switch (databits) /*設(shè)置數(shù)據(jù)位數(shù)*/
 ? ?{
 ? ? ? ?case 7:
 ? ? ? ?options.c_cflag |= CS7;
 ? ? ? ?break;
 ? ? ? ?case 8:
 ? ? ? ?options.c_cflag |= CS8;
 ? ? ? ?break;
 ? ? ? ?default:
 ? ? ? ?fprintf(stderr,"Unsupported data size
");
 ? ? ? ?return -1;
 ? ?}
 ? ?switch (parity) ?
 ? ?{ ?
 ? ? ? ?case 'n': ?
 ? ? ? ?case 'N': ?
 ? ? ? ? ? ?options.c_cflag &= ~PARENB; ?/* Clear parity enable */
 ? ? ? ? ? ?options.c_iflag &= ~INPCK; ?/* Enable parity checking */
 ? ? ? ? ? ?break; ?
 ? ? ? ?case 'o':
 ? ? ? ?case 'O':
 ? ? ? ? ? ?options.c_cflag |= (PARODD | PARENB); /* 設(shè)置為奇效驗(yàn)*/
 ? ? ? ? ? ?options.c_iflag |= INPCK; ?/* Disnable parity checking */
 ? ? ? ? ? ?break;
 ? ? ? ?case 'e':
 ? ? ? ?case 'E':
 ? ? ? ? ? ?options.c_cflag |= PARENB; ?/* Enable parity */
 ? ? ? ? ? ?options.c_cflag &= ~PARODD; ?/* ?*/
 ? ? ? ? ? ?options.c_iflag |= INPCK; ?/* Disnable parity checking */
 ? ? ? ? ? ?break;
 ? ? ? ?case 'S':
 ? ? ? ?case 's': /*as no parity*/
 ? ? ? ? ? ?options.c_cflag &= ~PARENB;
 ? ? ? ? ? ?options.c_cflag &= ~CSTOPB;break;
 ? ? ? ?default:
 ? ? ? ? ? ?fprintf(stderr,"Unsupported parity
");
 ? ? ? ? ? ?return -1;
 ? ?}
 ? ?/* 設(shè)置停止位*/
 ? ?switch (stopbits)
 ? ?{
 ? ? ? ?case 1:
 ? ? ? ? ? ?options.c_cflag &= ~CSTOPB;
 ? ? ? ? ? ?break;
 ? ? ? ?case 2:
 ? ? ? ? ? ?options.c_cflag |= CSTOPB;
 ? ? ? ? ? ?break;
 ? ? ? ?default:
 ? ? ? ? ? ?fprintf(stderr,"Unsupported stop bits
");
 ? ? ? ? ? ?return -1;
 ? ?}
 ? ?/* Set input parity option */
 ? ?if (parity != 'n')
 ? ? ? ?options.c_iflag |= INPCK;
 ? ?tcflush(fd,TCIFLUSH);
 ? ?options.c_cc[VTIME] = 150; /* ?15 seconds*/
 ? ?options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
 ? ?if (tcsetattr(fd,TCSANOW,&options) != 0) {
 ? ? ? ?perror("SetupSerial 3");
 ? ? ? ?return -1;
 ? ?}
 ? ?return 0;
}


void str_print(char *buf, int len) {
 ? ?int i;
 ? ?for (i=0; i

	

	2）編寫makefile：

	需注意，將makefile 中的編譯工具路徑修改為自己的工具路徑。

	
#CROSS_COMPILE = arm-linux-
#CROSS_COMPILE = arm-linux-gnueabihf-


CROSS_COMPILE=/home/xxx/v851s/Yuzukilizard/toolchain/gcc-linaro-5.3.1-2016.05-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-


# CPU = cortex-a7
# FPU = fpv4-sp-d16


AS        = $(CROSS_COMPILE)as
LD        = $(CROSS_COMPILE)ld
CC        = $(CROSS_COMPILE)gcc
CXX        = $(CROSS_COMPILE)g++
CPP        = $(CC) -E
AR        = $(CROSS_COMPILE)ar
NM        = $(CROSS_COMPILE)nm
STRIP       = $(CROSS_COMPILE)strip
OBJCOPY      = $(CROSS_COMPILE)objcopy
OBJDUMP      = $(CROSS_COMPILE)objdump
RANLIB      = $(CROSS_COMPILE)ranlib
SIZE       = $(CROSS_COMPILE)size


TOP_DIR      = $(shell pwd)


CFLAGS_inc_path  += -I$(TOP_DIR)


EXE = UARTTest


# CFLAGS_inc_path  += -I$(TOP_DIR)external/jpeg-9a


# for H.264 hardware codec
#CFLAGS_inc_path  += -I$(TOP_DIR)/../../prebuilt/include/cedar


# CFLAGS += -std=gnu99 -mthumb -mabi=aapcs-linux -mlittle-endian
# CFLAGS += -fdata-sections -ffunction-sections
# CFLAGS += -mcpu=$(CPU) -mtune=$(CPU) -mfpu=$(FPU) -mfloat-abi=hard


SRC_HAL += ./ 


LIB_SRC := $(foreach spath, $(SRC_HAL), $(wildcard $(spath)*.c))
OBJECT += $(patsubst %.c,%.o,$(LIB_SRC))


LOCAL_INCLUDE += -I./


#CFLAGS      += -O2 -ggdb3 -DNDEBUG
CFLAGS      += $(LOCAL_INCLUDE) -static


# LDFLAGS = -L../../library/arm-linux-gnueabihf
# LIBS += -lawh264 -lvdecoder -lcdc_base -lMemAdapter -lVE -lvencoder -lvideoengine


all:$(EXE)
$(EXE):$(OBJECT)
 @$(CC) $(OBJECT) -o $(EXE) $(CFLAGS)
# @echo -- gcc $(SRCS) --
 @echo "Compile target done."
 @echo "use src files"


$(OBJECT):
.PHONY:clean
clean:
 @rm -rf *.o $(OBJECT) $(EXE)
 @echo "Clean done." 



	

	3）make 后，產(chǎn)生可執(zhí)行文件，adb push 到開發(fā)板中進(jìn)行執(zhí)行，執(zhí)行命令：

	
./UARTTest /dev/ttyS3 4

	

	4）用杜邦線將PE12 PE13 GND 三根線接到電腦串口（需要串口轉(zhuǎn)換小板子），波特率目前設(shè)定19200 ，使用串口工具，向板子隨便發(fā)送數(shù)據(jù)，板子接受到數(shù)據(jù)，就會(huì)發(fā)送數(shù)據(jù)到電腦。

	審核編輯：湯梓紅