自学教程：C++ writeData函数代码示例

// read the next channel data.. fill it in *tone// if tone isn't touched.. it should be inited so it just plays silence// return 0 if it's passing more data// return -1 if it's passing nothing (end of data)int SoundGenPCJr::getNextNote_v2(int ch) {	ToneChan *tpcm;	SndGenChan *chan;	const byte *data;	assert(ch < CHAN_MAX);	if (!_vm->getFlag(VM_FLAG_SOUND_ON))		return -1;	tpcm = &_tchannel[ch];	chan = &_channel[ch];	if (!chan->avail)		return -1;	while (chan->duration <= 0) {		data = chan->data;		// read the duration of the note		chan->duration = READ_LE_UINT16(data);  // duration		// if it's 0 then it's not going to be played		// if it's 0xFFFF then the channel data has finished.		if ((chan->duration == 0) || (chan->duration == 0xFFFF)) {			tpcm->genTypePrev = -1;			tpcm->freqCountPrev = -1;			break;		}		_tchannel[ch].genTypePrev = -1;		_tchannel[ch].freqCountPrev = -1;		// only tone channels dissolve		if ((ch != 3) && (_dissolveMethod != 0))    // != noise??			chan->dissolveCount = 0;		// attenuation (volume)		writeData(data[4]);		// frequency		writeData(data[3]);		writeData(data[2]);		// data now points to the next data seg-a-ment		chan->data += 5;	}	if (chan->duration == 0xFFFF) {		// kill channel		chan->avail = 0;		chan->attenuation = 0x0F;   // silent		chan->attenuationCopy = 0x0F;   // dunno really		return -1;	}	chan->duration--;	return 0;}

void AQCM0802::character(int column, int row, int c) {    int a = address(column, row);    writeCommand(a);    writeData(c);}

// Initialise the display with the require screen orientationvoid ILI9163::init(Rotation rotation) {	width = ILI9163_WIDTH;	height = ILI9163_HEIGHT;    m_cs->write(1);    m_reset->write(1);       // Hardware reset the LCD    reset();        writeCommand(ILI9163_CMD_EXIT_SLEEP_MODE);    _delay_ms(5); // Wait for the screen to wake up        writeCommand(ILI9163_CMD_SET_PIXEL_FORMAT);    writeData(0x05); // 16 bits per pixel       writeCommand(ILI9163_CMD_SET_GAMMA_CURVE);    writeData(0x04); // Select gamma curve 3        writeCommand(ILI9163_CMD_GAM_R_SEL);    writeData(0x01); // Gamma adjustment enabled        writeCommand(ILI9163_CMD_POSITIVE_GAMMA_CORRECT);    writeData(0x3f); // 1st Parameter    writeData(0x25); // 2nd Parameter    writeData(0x1c); // 3rd Parameter    writeData(0x1e); // 4th Parameter    writeData(0x20); // 5th Parameter    writeData(0x12); // 6th Parameter    writeData(0x2a); // 7th Parameter    writeData(0x90); // 8th Parameter    writeData(0x24); // 9th Parameter    writeData(0x11); // 10th Parameter    writeData(0x00); // 11th Parameter    writeData(0x00); // 12th Parameter    writeData(0x00); // 13th Parameter    writeData(0x00); // 14th Parameter    writeData(0x00); // 15th Parameter         writeCommand(ILI9163_CMD_NEGATIVE_GAMMA_CORRECT);    writeData(0x20); // 1st Parameter    writeData(0x20); // 2nd Parameter    writeData(0x20); // 3rd Parameter    writeData(0x20); // 4th Parameter    writeData(0x05); // 5th Parameter    writeData(0x00); // 6th Parameter    writeData(0x15); // 7th Parameter    writeData(0xa7); // 8th Parameter    writeData(0x3d); // 9th Parameter    writeData(0x18); // 10th Parameter    writeData(0x25); // 11th Parameter    writeData(0x2a); // 12th Parameter    writeData(0x2b); // 13th Parameter    writeData(0x2b); // 14th Parameter    writeData(0x3a); // 15th Parameter        writeCommand(ILI9163_CMD_FRAME_RATE_CONTROL1);    writeData(0x08); // DIVA = 8    writeData(0x08); // VPA = 8        writeCommand(ILI9163_CMD_DISPLAY_INVERSION);    writeData(0x07); // NLA = 1, NLB = 1, NLC = 1 (all on Frame Inversion)       writeCommand(ILI9163_CMD_POWER_CONTROL1);    writeData(0x0a); // VRH = 10:  GVDD = 4.30    writeData(0x02); // VC = 2: VCI1 = 2.65          writeCommand(ILI9163_CMD_POWER_CONTROL2);    writeData(0x02); // BT = 2: AVDD = 2xVCI1, VCL = -1xVCI1, VGH = 5xVCI1, VGL = -2xVCI1    writeCommand(ILI9163_CMD_VCOM_CONTROL1);    writeData(0x50); // VMH = 80: VCOMH voltage = 4.5    writeData(0x5b); // VML = 91: VCOML voltage = -0.225        writeCommand(ILI9163_CMD_VCOM_OFFSET_CONTROL);    writeData(0x40); // nVM = 0, VMF = 64: VCOMH output = VMH, VCOML output = VML        writeCommand(ILI9163_CMD_SET_COLUMN_ADDRESS);    writeData(0x00); // XSH    writeData(0x00); // XSL    writeData(0x00); // XEH    writeData(0x7f); // XEL (128 pixels x)       writeCommand(ILI9163_CMD_SET_PAGE_ADDRESS);    writeData(0x00);    writeData(0x00);    writeData(0x00);    writeData(0x7f); // 128 pixels y        // Select display orientation    //writeCommand(ILI9163_CMD_SET_ADDRESS_MODE);    //writeData(rotation);    setRotation(rotation);    // Set the display to on    writeCommand(ILI9163_CMD_SET_DISPLAY_ON);    writeCommand(ILI9163_CMD_WRITE_MEMORY_START);}

/** * /par Function *   writeReg * /par Description *   Write the registor of i2c device. * /param[in] *   reg - the address of registor. * /param[in] *   data - the data that will be written to the registor. * /par Output *   None * /return *   Return the error code. *   the definition of the value of variable return_value: *   0:success *   1:BUFFER_LENGTH is shorter than size *   2:address send, nack received *   3:data send, nack received *   4:other twi error *   refer to the arduino official library twi.c * /par Others *   To set the registor for initializing. */int8_t MeGyro::writeReg(int16_t reg, uint8_t data){    int8_t return_value = 0;    return_value = writeData(reg, &data, 1);    return(return_value);}

int runCommand(int argc, char *argv[]){	if (!readData()) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: Error reading mystore.dat/n/n%s|/n", Usage);		return 1;	}	if (command == ADD && !add(argv[1],argv[2])) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: Failure to add new item|/n");		return 1;	}	if (command == STAT) {		printf("running stat/n");		status();	}	if (command == SEARCH && !search(argv[1])) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: Cannot search %s|/n",argv[1]);		return 1;	}	if (command == DISPLAY && !display(argv[1])) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: Cannot display %s|/n",argv[1]);		return 1;	}		if (command == DELETE && !delete(argv[1])) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: Cannot delete %s|/n", argv[1]);		return 1;	}		if (command == EDIT && !edit(argv[1])) {		if (errmsg[0] != '/0')			printf("|status: ERROR: %s|/n", errmsg);		else			printf("|status: ERROR: cannot edit %s|/n",argv[1]);		return 1;	}		if (rewrite) {		printf("rewriting/n");		if (!writeData()) {			if (errmsg[0] != '/0')				printf("|status: ERROR: %s|/n", errmsg);			else				printf("|status: ERROR: Could not write the data, file may be destroyed|/n");			return 1;		}	}	return 0;}

void processCommand( unsigned char cmd ) {		if ( cmd == CMD_SELECT_DEVICE ) {		selectedDevice = uart_getc( );		uart_putc( BYTE_CR );	} else if ( cmd == CMD_SHOW_ID ) {		uart_puts( AVRISP_IDENTIFIER );	} else if ( cmd == CMD_SOFTWARE_VERSION ) {		uart_puts( AVRISP_SWVER );	} else if ( cmd == CMD_HARDWARE_VERSION ) {		uart_puts( AVRISP_HWVER );	} else if ( cmd == CMD_LIST_SUPPORTED_DEVICES ) {		uart_puts( AVRISP_SUPPORTED_DEVICES );		uart_putc( 0 ); // terminating null character needs to be sent	} else if ( cmd == CMD_PROGRAMMER_TYPE ) {		uart_putc( AVRISP_PROGRAMMER_TYPE );	} else if ( cmd == CMD_SUPPORTS_AUTOINCREMENT ) {		uart_putc( AVRISP_RESP_YES );	} else if ( cmd == CMD_SET_LED ) {		LED_on( );		uart_putc( BYTE_CR );	} else if ( cmd == CMD_CLEAR_LED ) {		LED_off( );		uart_putc( BYTE_CR );	} else if ( selectedDevice == 0 ) {		// require a device for the rest of the commands		uart_putc( AVRISP_RESP_UNKNOWN );		return;	}		// command not specified above		if ( cmd == CMD_ENTER_PROGRAM_MODE ) {		enableProgramMode( );	} else if ( cmd == CMD_LEAVE_PROGRAM_MODE ) {		leaveProgramMode( );	} else if ( cmd == CMD_WRITE_PROG_H ) {		writeProgH( );	} else if ( cmd == CMD_WRITE_PROG_L ) {		writeProgL( );	} else if ( cmd == CMD_READ_PROG ) {		readProg( );	} else if ( cmd == CMD_LOAD_ADDRESS ) {		loadAddress( );	} else if ( cmd == CMD_WRITE_DATA ) {		writeData( );	} else if ( cmd == CMD_READ_DATA ) {		readData( );	} else if ( cmd == CMD_CHIP_ERASE ) {		chipErase( );	} else if ( cmd == CMD_WRITE_LOCK_BITS ) {		writeLockBits( );	} else if ( cmd == CMD_READ_SIGNATURE ) {		readSignature( );	} else if ( cmd == CMD_WRITE_PROGRAM_PAGE ) {		writeProgramPage( );	} else if ( cmd == CMD_UNIVERSAL_3 ) {		universalWrite3( );	} else if ( cmd == CMD_UNIVERSAL_4 ) {		universalWrite4( );	} else if ( cmd == CMD_LOAD_ADDRESS_0 ) {		currentAddress = 0;		uart_putc( BYTE_CR );	}}

void doShell(Client* shellClient) {    Client* p;    char head[HEAD_SIZE], value[VALUE_SIZE];    char fileBuffer[FILE_BUFFER_SIZE + 1];    char fileChunk[FILE_CHUNK_SIZE];    char filename[256];    unsigned long fileSize;    int fd;    FILE* fp;    FDEBUG(("shell start/n"));    while (1) {        // shell 
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