自学教程：C++ twi_init函数代码示例

void setUp() {    init_fake_port();	twi_tests_setUp();	twea_flag = 0;	BOOL res = twi_init(testPin1, testPin2);    TEST_ASSERT_TRUE_MESSAGE(res, "failed to initialize twi master.");}

int main( void ) {		twi_init();		// Init TWI interface	// Init HT16K22. Page 32 datasheet	twi_start();	twi_tx(0xE0);	// Display I2C addres + R/W bit	twi_tx(0x21);	// Internal osc on (page 10 HT16K33)	twi_stop();	twi_start();	twi_tx(0xE0);	// Display I2C address + R/W bit	twi_tx(0xA0);	// HT16K33 pins all output	twi_stop();	twi_start();	twi_tx(0xE0);	// Display I2C address + R/W bit	twi_tx(0xE3);	// Display Dimming 4/16 duty cycle	twi_stop();	twi_start();	twi_tx(0xE0);	// Display I2C address + R/W bit	twi_tx(0x81);	// Display OFF - Blink On	twi_stop();	twi_clear();		play_fill_animation();		clear_rows();		return 1;	}

int main(void){	DDRA=0xFF;	PORTA=0x00;	uint8_t time[3];	uint8_t Flag,Flag1;	usartInit();	printf("*--------------------------------------------------- */r/n");	printf("*-------------------AT24CXX experiment-------------- */r/n");	printf("*--------------------------------------------------- */r/n");	twi_init();		PCF8563_init();		PCF8563_setTime(0,0,0); 		while(1)	{			while(1)		{			PCF8563_getTime(time);			if(Flag1 != Flag)			{				PORTA = time[0];				printf("Real time clock  %d:%d:%d /r /n",time[2],time[1],time[0]);				Flag1=Flag;			}  				Flag = time[0];		}	}}

intmain (void)// This is just a place holder application that will be replaced by// bootloader programming.  When built with BOOTSTRAPPER defined the// application will allow the bootloader itself to be programmed.{#ifdef BOOTSTRAPPER    // Initialize the bootloader exit and active flags.    bootloader_exit = 0;    bootloader_active = 0;    // Initialize programming module.    prog_init();    // Initialize TWI module.    twi_init();#endif    // Loop forever.    for (;;)    {#ifdef BOOTSTRAPPER        // Check for TWI conditions that require handling.        twi_check_conditions();#endif    }#ifdef BOOTSTRAPPER    // Restore TWI interface to powerup defaults.    twi_deinit();#endif    return 0;}

int main(void){  init_sys_clocks();  init_dbg_rs232(FPBA_HZ);  print_dbg("AVR UC3 DSP DEMO/r/n");  irq_initialize_vectors();  // GUI, Controller and DSP process init  gui_init(FCPU_HZ, FHSB_HZ, FPBA_HZ, FPBB_HZ);  gui_text_print(GUI_COMMENT_ID, TEXT_IDLE);  gui_text_print(GUI_FILTER_ID, filter_active_get_description());  controller_init(FCPU_HZ, FHSB_HZ, FPBA_HZ, FPBB_HZ);  twi_init();  dsp_process_init(FCPU_HZ, FHSB_HZ, FPBA_HZ, FPBB_HZ);  cpu_irq_enable();  // Main loop  while (1)  {    gui_task();    controller_task();    dsp_process_task();    state_machine_task();  }}

/* returns * - success: 0 */uint8_t teensy_init(void) {	CPU_PRESCALE(CPU_16MHz);  // speed should match F_CPU in makefile	// onboard LED	DDRD  &= ~(1<<6);  // set D(6) as input	PORTD &= ~(1<<6);  // set D(6) internal pull-up disabled	// keyboard LEDs (see "PWM on ports OC1(A|B|C)" in "teensy-2-0.md")	_led_all_off();  // (just to put the pins in a known state)	TCCR1A  = 0b10101001;  // set and configure fast PWM	TCCR1B  = 0b00001001;  // set and configure fast PWM	// I2C (TWI)	twi_init();  // on pins D(1,0)	// unused pins	teensypin_write_all_unused(DDR, CLEAR); // set as input	teensypin_write_all_unused(PORT, SET);  // set internal pull-up enabled	// rows	teensypin_write_all_row(DDR, CLEAR); // set as input	teensypin_write_all_row(PORT, SET);  // set internal pull-up enabled	// columns	teensypin_write_all_column(DDR, CLEAR);   // set as input (hi-Z)	teensypin_write_all_column(PORT, CLEAR);  // set internal pull-up	                                          //   disabled	return 0;  // success}

void GadgetShield::Setup(void){  // Configure infrared emitter and detector  pinMode(IRIN_PIN, INPUT);     // There is already an external pullup in the detector itself but it  digitalWrite(IRIN_PIN, HIGH); // doesn't hurt to add our own pullup as the detector's is weak.  pinMode(IROUT_PIN, OUTPUT);  digitalWrite(IROUT_PIN, LOW);  // Configure general-purpose LED's  pinMode(LED1_PIN, OUTPUT); pinMode(LED2_PIN, OUTPUT); pinMode(LED3_PIN, OUTPUT); pinMode(LED4_PIN, OUTPUT);  digitalWrite(LED1_PIN, LOW); digitalWrite(LED2_PIN, LOW); digitalWrite(LED3_PIN, LOW); digitalWrite(LED4_PIN, LOW);  // Configure RGB LED  pinMode(RED_PIN, OUTPUT); pinMode(GREEN_PIN, OUTPUT); pinMode(BLUE_PIN, OUTPUT);  RGB(0,0,0);  // Configure pushbuttons  pinMode(PB1_PIN, INPUT); // There are already external pullups so no internal pullup is needed  pinMode(PB2_PIN, INPUT);  // Configure speaker  pinMode(SPEAKER_PIN, OUTPUT);  digitalWrite(SPEAKER_PIN, LOW);  Speaker(1000); // Just to initialize timer infrastructure for speaker and Blue RGB LED pin  Speaker(0);  // Configure TWI interface to accelerometer and restore to default settings  twi_init();  // Initialize accelerometer  accel_init();  // Assume microphone baseline is 2.5V. Establish experimentally by calling MicrophoneSetBaseline().  m_mic_baseline = 127;}

void hh10d_init(void *cfg) {    // Read calibrate paremeter with TWI    int rc;    char buf[6];    twi_init();    rc = ee24xx_read_bytes(10,4,buf);    if (rc != 4) {        sens = 0;        offset = 0;        return;    }#ifdef DEBUG    uart_hexdump(buf,4);    uart_putc ('/r');    uart_putc ('/n');#endif    sens = buf[0] * 256 + buf[1];    offset = buf[2] * 256 + buf[3];#ifdef DEBUG    itoa(sens,buf,10);    uart_putstr(buf);    uart_putstr_P(PSTR("/r/n"));    itoa(offset,buf,10);    uart_putstr(buf);    uart_putstr_P(PSTR("/r/n"));#endif    // rising edge    EICRA |= (1 << ISC10) | (1 << ISC11);    // enable INT1    EIMSK |= (1 << INT1);}

int main(void){	// Enable peripherals	system_init();	pins_init();	us1_init();	us0_init();	twi_init();	// Initialize state machines	qcfp_init();	eq_init();	// Once everything is initialized, enable interrupts globally	interrupts_enable();	// Enable Expansion module 3 and 4 (sensors plugged into these temporarily)	AT91C_BASE_PIOA->PIO_CODR = AT91C_PIO_PA20;	AT91C_BASE_PIOA->PIO_CODR = AT91C_PIO_PA23;	sensors_init();	eq_post_timer(gpio_led_dance, 250, eq_timer_periodic);	while(1)	{		eq_dispatch();		eq_dispatch_timers();	}	return 0;}

int main(void){    char str[30];    status_init();    adc_init();        status_set(false);        uart_init(1);    twi_init(0xC);    twi_enable_interrupt();    twi_register_get(get);        measurement = 0;        sei();        while (1) {                // VRef is 2.56V        // at T = 0, VOut = 0V. VOut scales at 10mV / 
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