STM32ZET6
- 单片机、嵌入式、EDA/PCB、传感器/MEMS
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请问单片机串口的初始化都有哪些必需的步骤呢？
- 2020-12-09
没问题。串口范例程序，可以参考下#include "reg51.h"#include "intrins.h"typedef unsigned char BYTE;typedef unsigned int WORD;#define FOSC 11059200L //System frequency#define BAUD 9600 //UART baudrate/@@*Define UART parity mode*/#define NONE_PARITY 0 //None parity#define ODD_PARITY 1 //Odd parity#define EVEN_PARITY 2 //Even parity#define MARK_PARITY 3 //Mark parity#define SPACE_PARITY 4 //Space parity#define PARITYBIT NONE_PARITY //Testing even paritysbit bit9 = P2^2; //P2.2 show UART data bit9bit busy;void SendData(BYTE dat);void SendString(char *s);void main(){#if (PARITYBIT == NONE_PARITY) SCON = 0x50; //8-bit variable UART#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY) SCON = 0xda; //9-bit variable UART parity bit initial to 1#elif (PARITYBIT == SPACE_PARITY) SCON = 0xd2; //9-bit variable UART parity bit initial to 0#endif TMOD = 0x20; //Set Timer1 as 8-bit auto reload mode TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule TR1 = 1; //Timer1 start run ES = 1; //Enable UART interrupt EA = 1; //Open master interrupt switch SendString("STC12C5A60S2\r\nUart Test !\r\n"); while(1);}/@@*----------------------------UART interrupt service routine----------------------------*/void Uart_Isr() interrupt 4{ if (RI) { RI = 0; //Clear receive interrupt flag P0 = SBUF; //P0 show UART data bit9 = RB8; //P2.2 show parity bit } if (TI) { TI = 0; //Clear transmit interrupt flag busy = 0; //Clear transmit busy flag }}/@@*----------------------------Send a byte data to UARTInput: dat (data to be sent)Output:None----------------------------*/void SendData(BYTE dat){ while (busy); //Wait for the completion of the previous data is sent ACC = dat; //Calculate the even parity bit P (PSW.0) if (P) //Set the parity bit according to P {#if (PARITYBIT == ODD_PARITY) TB8 = 0; //Set parity bit to 0#elif (PARITYBIT == EVEN_PARITY) TB8 = 1; //Set parity bit to 1#endif } else {#if (PARITYBIT == ODD_PARITY) TB8 = 1; //Set parity bit to 1#elif (PARITYBIT == EVEN_PARITY) TB8 = 0; //Set parity bit to 0#endif } busy = 1; SBUF = ACC; //Send data to UART buffer}/@@*----------------------------Send a string to UARTInput: s (address of string)Output:None----------------------------*/void SendString(char *s){ while (*s) //Check the end of the string { SendData(*s++); //Send current char and increment string ptr }}
请问单片机串口的初始化都有哪些必需的步骤呢？
- 2020-12-09
串口的范例，可以参考下#include "reg51.h"#include "intrins.h"typedef unsigned char BYTE;typedef unsigned int WORD;#define FOSC 11059200L //System frequency#define BAUD 9600 //UART baudrate/@@*Define UART parity mode*/#define NONE_PARITY 0 //None parity#define ODD_PARITY 1 //Odd parity#define EVEN_PARITY 2 //Even parity#define MARK_PARITY 3 //Mark parity#define SPACE_PARITY 4 //Space parity#define PARITYBIT NONE_PARITY //Testing even paritysbit bit9 = P2^2; //P2.2 show UART data bit9bit busy;void SendData(BYTE dat);void SendString(char *s);void main(){#if (PARITYBIT == NONE_PARITY) SCON = 0x50; //8-bit variable UART#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY) SCON = 0xda; //9-bit variable UART parity bit initial to 1#elif (PARITYBIT == SPACE_PARITY) SCON = 0xd2; //9-bit variable UART parity bit initial to 0#endif TMOD = 0x20; //Set Timer1 as 8-bit auto reload mode TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule TR1 = 1; //Timer1 start run ES = 1; //Enable UART interrupt EA = 1; //Open master interrupt switch SendString("STC12C5A60S2\r\nUart Test !\r\n"); while(1);}/@@*----------------------------UART interrupt service routine----------------------------*/void Uart_Isr() interrupt 4{ if (RI) { RI = 0; //Clear receive interrupt flag P0 = SBUF; //P0 show UART data bit9 = RB8; //P2.2 show parity bit } if (TI) { TI = 0; //Clear transmit interrupt flag busy = 0; //Clear transmit busy flag }}/@@*----------------------------Send a byte data to UARTInput: dat (data to be sent)Output:None----------------------------*/void SendData(BYTE dat){ while (busy); //Wait for the completion of the previous data is sent ACC = dat; //Calculate the even parity bit P (PSW.0) if (P) //Set the parity bit according to P {#if (PARITYBIT == ODD_PARITY) TB8 = 0; //Set parity bit to 0#elif (PARITYBIT == EVEN_PARITY) TB8 = 1; //Set parity bit to 1#endif } else {#if (PARITYBIT == ODD_PARITY) TB8 = 1; //Set parity bit to 1#elif (PARITYBIT == EVEN_PARITY) TB8 = 0; //Set parity bit to 0#endif } busy = 1; SBUF = ACC; //Send data to UART buffer}/@@*----------------------------Send a string to UARTInput: s (address of string)Output:None----------------------------*/void SendString(char *s){ while (*s) //Check the end of the string { SendData(*s++); //Send current char and increment string ptr }}
