UART驱动
基于I.MX6ULL的串口驱动
1.uart驱动
1 #include "bsp_uart.h" 2 #include "bsp_gpio.h" 3 4 5 6 /*初始化UART1，波特率为115200*/ 7 void uart_init(void) 8 { 9 /*初始化UART1的IO*/ 10 uart_io_init(); 11 /*初始化UART1*/ 12 uart_disable(UART1);//关闭uart 13 uart_softreset(UART1);//复位UART1 14 /*配置UART1*/ 15 UART1->UCR1 &= ~(1<<14);//0 Disable automatic detection of baud rate 16 /*配置UART1的数据位、奇偶校验、停止位*/ 17 //UART1->UCR2=0; 18 UART1->UCR2 |= (1<<1)|(1<<2)|(1<<5)|(1<<14); 19 UART1->UCR3 |= (1<<2); 20 /*设置波特率为115200*/ 21 UART1->UFCR = 5 <<7;//1分频，uart_clk=80MHz 22 UART1->UBIR=71;//UBIR=(UBMR+1)*72/3125-1,UBIR=71,UBMR=3124 23 UART1->UBMR=3124;//UBIR=(UBMR+1)*72/3125-1,UBIR=71,UBMR=3124 24 /*使能串口*/ 25 uart_enable(UART1); 26 } 27 /*关闭UART*/ 28 void uart_disable(UART_Type *base) 29 { 30 base->UCR1 &= ~(1<<0); 31 } 32 /*打开UART*/ 33 void uart_enable(UART_Type *base) 34 { 35 base -> UCR1 |= (1<<0); 36 } 37 /*复位UART*/ 38 void uart_softreset(UART_Type *base) 39 { 40 base ->UCR2 &= ~(1<<0); 41 while((base->UCR2 &0x1)==0); 42 } 43 /*UART1的IO初始化*/ 44 void uart_io_init(void) 45 { 46 IOMUXC_SetPinMux(IOMUXC_UART1_TX_DATA_UART1_TX,0);//复用为UART1_TX 47 IOMUXC_SetPinMux(IOMUXC_UART1_RX_DATA_UART1_RX,0);//复用为UART1_RX 48 IOMUXC_SetPinConfig(IOMUXC_UART1_TX_DATA_UART1_TX,0X10B0); 49 IOMUXC_SetPinConfig(IOMUXC_UART1_RX_DATA_UART1_RX,0X10B0); 50 } 51 /*通过UART1发送一个字符*/ 52 void uart_putc(unsigned char c) 53 { 54 while(((UART1->USR2>>3)&0X01)==0); 55 UART1->UTXD=c&0XFF;//发送数据 56 } 57 unsigned char uart_getc(void)//通过串口接收数据 58 { 59 while((UART1->USR2&0X01)==0);//等待，直到有数据为止 60 return UART1->URXD; 61 } 62 63 /*通过UART1发送一串字符*/ 64 void uart_puts(char *str) 65 { 66 char *p = str; 67 while(*p) 68 uart_putc(*p++); 69 }
2.main.c
1 #include "bsp_clk.h" 2 #include "bsp_delay.h" 3 #include "bsp_led.h" 4 #include "bsp_uart.h" 5 6 int main(void) 7 { 8 unsigned char state = OFF; 9 unsigned char a = 0; 10 delay_init();//延时初始化 11 uart_init();//初始化串口 12 clk_enable(); /* 使能所有的时钟 */ 13 led_init(); /* 初始化led */ 14 15 while(1) 16 { 17 a=uart_getc(); 18 uart_puts("切换灯光倒计时"); 19 uart_putc(a);//回显，我认为比较重要！！！ 20 uart_puts("\r\n"); 21 delay_ms(1000); 22 23 uart_puts("倒计时3秒"); 24 uart_putc(a); 25 uart_puts("\r\n"); 26 delay_ms(1000); 27 28 29 uart_puts("倒计时2秒"); 30 uart_putc(a); 31 uart_puts("\r\n"); 32 delay_ms(1000); 33 34 uart_puts("倒计时1秒"); 35 uart_putc(a); 36 uart_puts("\r\n"); 37 delay_ms(1000); 38 39 state =!state; 40 led_switch(LED0,state); 41 uart_puts("灯光已经切换\r\n"); 42 delay_ms(2000); 43 44 uart_puts("*******重新开始新的切换*******\n"); 45 uart_putc(a); 46 uart_puts("\r\n"); 47 } 48 return 0; 49 }
3.SecureCRT界面
