Serial Communication Experiment Based on c8051f410

This sectionProgramThe function is very simple, that is, to send a specific command by pressing a button, and to control the light from the light when receiving the command,

But it is very valuable for debugging. I helped a member of the association call the communication between c8051f410 and AVR, and I had my own

Use it for some projects. Therefore, upload the file for your reference.

# Include <c8051f410. h> // SFr declarations # include <stdio. h> # define sysclk 24500000 // internal oscillator frequency in Hz # define baudrate 2400 // baud rate of UART in bpssbit led1 = P2 ^ 1; sbit led2 = P2 ^ 3; sbit key1 = p1 ^ 4; sbit key2 = p1 ^ 5; void oscillator_init (void); void port_init (void); void uart0_init (void); void uart_send (unsigned char m ); void delay (unsigned int m); void delay_ms (unsigned int N ); Void main (void) {pca0md & = ~ 0x40; // disable watchdog timer oscillator_init (); // initialize oscillator port_init (); // initialize crossbar and portsuart0_init (); EA = 1; // enable global interrupts while (1) {If (key1! = 1) {delay_ms (500); uart_send (0xb0); key1 = 1;} If (key2! = 1) {delay_ms (500); uart_send (0xb1); key2 = 1 ;}// wait for interrupt} void oscillator_init (void) {oscicn = 0x87; // set clock to 24.5 MHz rstsrc = 0x04; // enable missing clock detector} void port_init (void) {// p0mdin = 0xfc; // configure p0.0 and p0.1 to analog p0mdout | = 0x10; // enable utx as push-pull output p0skip = 0x03; // skip p0.0 and p0.1 on the crossbar p1mdin | = 0x30; p1mdout & = ~ 0x30; p1skip = 0x30; p2mdin = 0xff; p2mdout = 0x0a; p2skip = 0x0a; xbr0 = 0x01; // enable UART on limit 4 (TX) and between 5 (RX) xbr1 = 0x40; // enable crossbar and weak pull-ups} void uart0_init (void) {scon0 = 0x10; // scon0: 8-bit Variable Bit Rate // level of stop bit is ignored // RX enabled // ninth bits are zeros // clear ri0 and ti0 bits if (sysclk/baudrate/2/256 <1) {Th1 =-(sysclk/baudrate/2); ckcon | = 0 X08; // t1m = 1; SCA1: 0 = XX} else if (sysclk/baudrate/2/256 <4) {Th1 =-(sysclk/baudrate/2/4 ); ckcon & = ~ 0x0b; // t1m = 0; SCA1: 0 = 01 ckcon | = 0x01;} else if (sysclk/baudrate/2/256 <12) {Th1 =-(sysclk/baudrate/2/12); ckcon & = ~ 0x0b; // t1m = 0; SCA1: 0 = 00} else if (sysclk/baudrate/2/256 <48) {Th1 =-(sysclk/baudrate/2/48 ); ckcon & = ~ 0x0b; // t1m = 0; SCA1: 0 = 10 ckcon | = 0x02;} else {While (1); // error. unsupported baud rate} TL1 = Th1; // init timer1 tmod & = ~ 0xf0; // tmod: timer 1 in 8-bit autoreload tmod | = 0x20; tr1 = 1; // start timer1 IP | = 0x10; // make UART high priority es0 = 1; // enable uart0 interrupts} void uart0_interrupt (void) interrupt 4 {unsigned char byte; If (ri0 = 1) {ri0 = 0; // clear interrupt flag byte = sbuf0; // read a character from uartswitch (byte) {Case 0xb0: led1 = 1; led2 = 0; break; Case 0xb1: led1 = 0; led2 = 1; break; default: break;} If (ti0 = 1) // check if transmit flag is set {ti0 = 0; // clear interrupt flag} void uart_send (unsigned char m) {While (ti0 = 1); sbuf0 = m;} void delay_ms (unsigned int m) {While (M --) delay (2046);} void delay (unsigned int m) {While (M --);}