自学教程：C++ uart_send函数代码示例

void notmain ( void ) {    uart_init();    hexstring(0x12345678);    hexstring(GETPC());    timer_init();    /*     * 132 byte packet.  All fields are 1 byte except for the 128 byte data     * payload.     * 		+-----+------+----------+--....----+-----+     * 		| SOH | blk# | 255-blk# | ..data.. | cksum |     * 		+-----+------+----------+--....----+-----+     * Protocol:     * 	- first block# = 1.     *  - CRC is over the whole packet     *  - after all packets sent, sender transmits a single EOT (must ACK).     */    unsigned char block = 1;    unsigned addr = ARMBASE;    while (1) {        unsigned char b;        // We received an EOT, send an ACK, jump to beginning of code        if((b = getbyte()) == EOT) {            uart_send(ACK);            BRANCHTO(ARMBASE);            return; // NOTREACHED        }        /*         * if first byte is not SOH, or second byte is not the         * expected block number or the third byte is not its         * negation, send a nak for a resend of this block.         */        if(b != SOH                || getbyte() != block                || getbyte() != (0xFF - block)) {            uart_send(NAK);            continue;        }        // get the data bytes        int i;        unsigned char cksum;        for(cksum = i = 0; i < PAYLOAD_SIZE; i++) {            cksum += (b = getbyte());            PUT8(addr+i, b);        }        // Checksum failed: NAK the block        if(getbyte() != cksum)            uart_send(NAK);        // Commit our addr pointer and go to next block.        else {            uart_send(ACK);            addr += PAYLOAD_SIZE;            block++;        }    }}

void keyscan(){    P2=0xfe;    temp=P2;    temp=temp&0xf0;    while(temp!=0xf0)    {      delay(5);      temp=P2;      temp=temp&0xf0;      while(temp!=0xf0)      {       	temp=P2;      	switch(temp)       {        case 0xee: uart_send(4);         break;        case 0xde: uart_send(4);         break;        case 0xbe: uart_send(4);         break;        case 0x7e: uart_send(4);         break;       }      while(temp!=0xf0)       {        temp=P2;        temp=temp&0xf0;       }      }     }}

/** @brief Run the application. */static void boot(void){#ifdef ENABLE_UART  // extra null bytes to make sure the status is properly sent  uart_send(0);  uart_send(0);  // wait for the last byte  while( !(UCSRxA & ((1<<UDREx)|(1<<TXCx))) ) ;  UCSRxB = 0; // disable#endif#ifdef ENABLE_I2C_SLAVE  TWCR = 0;  TWAR = 0;#endif  /* interruptions not used, moving interrupt vector not needed  IVCR = (1<<IVCE);  IVCR = (0<<IVSEL);   */#ifdef BOOT_CODE  do{ BOOT_CODE }while(0);#endif  run_app();}

//------------------------------------------------------------------------void notmain ( void ){    //unsigned int ra;    switch_to_80Mhz();    uart_init();    hexstring(0x87654321);    hexstring(0x12345678);    //Cortex-M4 systick timer init    PUT32(STCTRL,0x00000004);    PUT32(STRELOAD,1000000-1);    PUT32(STCURRENT,0); //value is a dont care    PUT32(STCTRL,0x00000005);    while(1)    {        uart_send(0x55);        dowait();        uart_send(0x56);        dowait();    }}

void bootmain(void){	uart_send('Y');	uart_send('/n');	while(1)	return;}

void sserial_sendbyte(byte bt){	uart_send(sserial_portindex,bt);sserial_crc16=_crc16_update(sserial_crc16,bt);	if (bt==0x98)	{		uart_send(sserial_portindex,0);	}}

void uart_drawline(uint8_t length, const uint8_t space){	if(space){uart_send('/r');uart_send('/n');}	while(length){		length--;		uart_send('-');	}	if(space){uart_send('/r');uart_send('/n');}}

void uart_send_word_i(uint8_t i, uint16_t w, const char *s){	char print[5];	itoa(i, print, 10);	uart_puts(print); uart_send('.');	uart_puts(s); uart_send(' ');	itoa(w, print, 10);	uart_puts(print); uart_send(' ');}

intuart_put(char c, FILE *stream){	if (c == '/n')		uart_send('/r');	uart_send(c);	return 0;}

void request_feedback(unsigned char num)				//send command to request the current position of servo{		//servo channel should start with 0b01XX XXXX	//therefore needs to change to 0x41-0x60		num=num|0b01000000;					uart_send('@');  							//First byte is the start byte: '@' or 0x40			uart_send(num);								//Second byte is the requsting servo channle 0x41-0x60}

/* *  システムログの低レベル出力のための文字出力 */voidtarget_fput_log(char c){    // Port 1 is always used for low level ouput (e.g. LOG_EMERG)	if (c == '/n') {		while(!uart_send(&UART1, '/r'));	}	while(!uart_send(&UART1, c));}

void puts_unsafe(const char *string){    const char *cur = string;    for (; *cur; ++cur)    {        uart_send(*cur);    }    uart_send(CR);    uart_send(LF);}

void sserial_send_response (){	sserial_send_start(sserial_portindex);	uart_send(sserial_portindex,0);	uart_send(sserial_portindex,0);	uart_send(sserial_portindex,0x98);	uart_send(sserial_portindex,0x03);	sserial_crc16=0xFFFF;	sserial_sendbyte(sserial_address>>8);	sserial_sendbyte(sserial_address&255);	sserial_sendbyte(sserial_response.result);	for (unsigned int i=0; i< sserial_response.datalength; i++)	{		sserial_sendbyte(sserial_response.data[i]);	}	uint16_t crc=sserial_crc16;	sserial_sendbyte(crc>>8);	sserial_sendbyte(crc&255);	uart_send(sserial_portindex,0x98);	uart_send(sserial_portindex,0x04);	uart_send(sserial_portindex,0);	uart_send(sserial_portindex,0);	uart_send(sserial_portindex,0);	sserial_send_end(sserial_portindex);}

void print_ch(u8 ch){	if (ch == '/n') {		uart_send('/r');		uart_send('/n');	} else if (ch == '/r') {		uart_send('/r');		uart_send('/n');	} else {		uart_send(ch);	}}

/**  * @file   void uart_configuration(void)  * @brief  
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