main_option2.c

nrf24z1 代码

                    adc_wake();                     // Wake up ATX resources
                    dac_wake();                     // Wake up ARX resources, may also test that logical return of dac_wake() indicated success
 
                    z1_arx_mute(MUTEOFF);           // If ARX was muted at by pause button remove muting each time units exit sleep mode by UI
                    muted = 0;                      // Simulating Play/Pause functionality
                    #ifdef USELED
                        ledsequence = LED_AWAKE;    // Blink in a pattern indicating audio streaming 
                    #endif
                    
                    powermode = PMODE_AWAKE;        // And indicate a power up of ATX
                }
            }

            #ifdef USELED
                mcu_atxled(z1_rotate_led());        // Alter ATX LED according to blinking sequence, after potentially critical operations!
            #endif

        } // powermode == PMODE_AUTODOWN

        else if (powermode == PMODE_POWERDOWN) {

            if (wakeup == WAKE_Z1_INT) {
                // Keep reading RXPIN as long as ATX nRF24Z1 is on (i.e. interrupt pin is active on low) or until 
                // a button is received. In option 2 the ARX may be turned on (by user interrupt on ARX Play button) 
                // at any time while the ATX is awake.
                
                buttons = BTN_NOKEY;                
                while ((mcu_z1int_active()) && (buttons == BTN_NOKEY)) {
                    buttons = z1_singleread(RXPIN) & 0x0F;  // Read buttons from ARX.   If ARX is linked and a button is detected, ATX copy is later
                    if (buttons != BTN_NOKEY)               // If nothing from ARX,     overwritten. If not linked, no button from ARX is found
                        z1_singlewrite(RXPIN, BTN_NOKEY);   // Overwrite ATX copy of RXPIN to avoid confusion
                }

                if ((buttons == BTN_PLAY) && (mcu_z1int_active())) {    // Play button will wake system, but ATX nRF24Z1 must be alive to take cmd.
                    z1_singlewrite(TXWTI, 0x00);    // Disable auto power down while sending wakeup commands to ATX
                    z1_singlewrite(TXMOD, z1_singleread(TXMOD) & ~0x40);    // Wake up ATX
                    z1_singlewrite(RXMOD, z1_singleread(RXMOD) & ~0x80);    // Wake up ARX

                    // In user interface option 2 there is no strict need to test 
                    // for whether or not a link was established. There the ARX is 
                    // wake-on-interrupt, and it is ready to establish a link for 
                    // TXWTI * (TXLTI + 1) * 10ms after Play was pressed on ARX.

                    if (z1_haslink_wait()) {        // Wait until a link is established or timeout

                        // Instruct source to commence playing music

                        adc_wake();                 // Wake up ATX resources
                        dac_wake();                 // Wake up ARX resources, may also test that logical return of dac_wake() indicated success
                        #ifdef USELED   
                            ledsequence = LED_AWAKE;    // Blink in a pattern indicating audio streaming 
                        #endif

                        powermode = PMODE_AWAKE;    // Indicate that system is awake 
                        debounce = 1;               // Activate software debounce

                        z1_singlewrite(TXWTI, SLEEP_TXWTI);     // Re-enable auto power down = allow for proper TXLTI timing
                    }
                    else {                          // No link found, power things down again, this is same sequence as Stop button performs
                        z1_singlewrite(RXMOD, z1_singleread(RXMOD) | 0x80);     // Put ARX to sleep
                        z1_singlewrite(TXWTI, SLEEP_TXWTI);         // Re-enable auto power down = allow for proper TXLTI timing
                        z1_singlewrite(TXMOD, z1_singleread(TXMOD) | 0x40); // Put ATX to sleep
                    } // No link found
                } // BTN_PLAY

                #ifdef USELED
                    mcu_atxled(z1_rotate_led());    // Alter ATX LED according to blinking sequence, after potentially critical operations!
                #endif

            } // PMODE_POWERDOWN / WAKE_Z1_INT
            
            else if (wakeup == WAKE_WAIT) {
                // In user interface option 2 ATX is wake-on-timer. Thus waking from MCU timer (i.e. no 
                // ATX nRF24Z1 interrupt) while in sleep mode means that the security timer of the MCU interrupted 
                // the MCU without the ATX nRF24Z1 interrupting the MCU. This indicates that the system is 
                // not working properly. That is because the ATX nRF24Z1 interrupts the MCU whenever it wakes up. 
                // Also, an unknown interrupt may have struck at an unexpected time.

                // Arriving here indicates an error, a wakeup from the MCU timer used as a safety device. 

                #ifdef TERMINATE_ON_ERROR
                    booterror = 1;
                #endif
            } // PMODE_POWERDOWN / WAKE_WAIT
        } 
        else if (powermode == PMODE_AWAKE) {
        
            if (wakeup == WAKE_Z1_INT) {
                // In user interface option 2 an arriving nRF24Z1 interrupt while awake means ATX nRF24Z1 went to auto power down 
                // mode. That is because interrupts from ATX nRF24Z1 are currently set to only occur when it is briefly awake to poll 
                // the airways. I.e. it did go to auto power down shortly before generating the detected interrupt. 

                // Unfortunately, there is no way to reach the DAC in the  ARX because that nRF24Z1 has probably gone to auto power 
                // down mode too. Therefore, the DAC will continue to burn power. Instead, power down all ATX resources and indicate 
                // that the system is in power down mode. 

                // When in automatic power down, TXMOD and RXMOD are set at the same levels as for audio streaming. They have to be 
                // set so in order to allow wakeup from automatic power down at a later stage.

                // Instruct audio source to stop playing music here!

                adc_sleep();                        // Then, power down ATX resources
                #ifdef USELED
                    ledsequence = LED_AUTODOWN;     // Blink in a pattern indicating auto power down
                #endif

                powermode = PMODE_AUTODOWN;         // Indicate that sleep is due to an automatic power down
            } // PMODE_AWAKE / WAKE_Z1_INT

            else if (wakeup == WAKE_WAIT) {
                // This is audio streaming mode. The MCU is polling ARX buttons and local buttons while awake.
                // All buttons are interpreted. 
                
                buttons = BTN_NOKEY;                // Assume that no button is pressed
                if (mcu_z1int_active())             // Is ATX nRF24Z1 awake and listening on the slave interface?           
                    buttons = z1_singleread(RXPIN) & 0x0F;  // Read buttons from ARX
                if (buttons == BTN_NOKEY)           // If nothing pressed on ARX,
                    buttons = mcu_buttons();        // Process buttons from ATX

                if (debounce == 0) {                

                    // The following buttons are single-action (i.e. require that no button is pressed before requested action is taken)

                    switch (buttons) {
                        case BTN_STOP:
                            // Enter your application code to handle a stop button!

                            dac_sleep();            // First power down DAC before powering down radio ling
                            adc_sleep();            // Power down resources on ATX

                            // TXMOD and RXMOD must now be set so that the two devices do not wake up even if they are within 
                            // range and in link mode at the same time. Such a condition would otherwise have woken them up
                            // again. Wakeup must only happen when the user pressed the Play button, in which case RXMOD and 
                            // TXMOD are set for power on in order to attempt linkup.

                            #ifdef USELED 
                                z1_arxled(LEDOFF);              // Turn off ARX LED before going to sleep and removing link
                                ledsequence = LED_POWERDOWN;    // Blink in a pattern indicating power down
                            #endif

                            powermode = PMODE_POWERDOWN;
                            z1_singlewrite(RXMOD, z1_singleread(RXMOD) | 0x80);     // Put ARX to sleep
                            z1_singlewrite(TXWTI, SLEEP_TXWTI);         // Re-enable auto power down = allow for proper TXLTI timing
                            z1_singlewrite(TXMOD, z1_singleread(TXMOD) | 0x40); // Put ATX to sleep

                            mcu_wait_ms(3200);      // Don't actually sleep for 3.2 seconds but pick up the first (stray) interrupt from ATX
                        break;
                        case BTN_PLAY:              // Play button detected
                            // Enter your application code to handle a play/pause button. A pause button simulation is inserted below.
                            // The pause functionality here does not communicate with the audio source. It does not put any unit
                            // into power save mode. It is just to simulate a common look-and-feel

                            if (muted == 0) {           // Simulating Play/Pause functionality
                                z1_arx_mute(MUTEON);    // If no mute, turn on mute = Pause
                                muted = 1;
                            }
                            else {                      // If muted, turn off mute = (de)Pause
                                z1_arx_mute(MUTEOFF);
                                muted = 0;
                            }
                        break;
                        case BTN_SKIPF:              // Skip forward button detected
                            // Enter your application code to handle a forward skip button
                        break;
                        case BTN_SKIPB:              // Skip backward button detected
                            // Enter your application code to handle a backward skip button
                        break;
                        case BTN_BBOOST:              // Play detected
                            // Enter your application code to handle a bass boost button (button not implemented in Headphone Reference Design)
                        break;
                        default:                    // Do not consider other buttons here
                        break;
                    } // end of switch
                } // debounce == 0

                // The following buttons may be held to cause repeated action

               switch (buttons) {
                    case BTN_VOLUP:                 // Volume up button detected
                        dac_volume_up();            // This program increases volume in remote DAC
                    break;
                    case BTN_VOLDN:                 // Volume down button detected
                        dac_volume_down();          // This program decreases volume in remote DAC
                    break;
                    case BTN_SCANF:                 // Scan forward button detected
                        // Enter your application code to handle a forward scan button (button not implemented in Headphone Reference Design)
                    break;
                    case BTN_SCANB:                 // Scan backward button detected
                        // Enter your application code to handle a backward scan button (button not implemented in Headphone Reference Design)
                    break;
                    default:                        // Do not consider other buttons here
                    break;
               } // end of switch
  
                // Other buttons may be defined here according to your application

                if (buttons == BTN_NOKEY)               // If no buttons were detected,
                    debounce = 0;                       // Indicate all buttons were released
                else                                    // Some button detected
                    debounce = 1;                       // Activate software debounce

                #ifdef USELED                           // ATX button polling is called every 64ms. That is an okay period for LED blinking
                    if (powermode == PMODE_AWAKE) {     // If no power down etc has been initiated yet, process LED blinking
                        if (mcu_z1int_active()) {       // If ATX nRF24Z1 is active, (important to check in case of auto power down)
                            ledtemp = z1_rotate_led();  // Record present state in LED blinking sequence
                            if (ledstatus != ledtemp) {
                                mcu_atxled(ledtemp);    // Alter ATX LED according to blinking sequence
                                z1_arxled(ledtemp);     // Alter ARX LED according to blinking sequence
                                ledstatus = ledtemp;
                            }
                        }
                    }
                #endif
            } // PMODE_AWAKE / WAKE_WAIT
        }
    } // while (booterror == 0)

    // We arrive here with booterror != 0. Bootup or user interface failed. Program terminates.

    adc_sleep();                                    // Power down resources on ATX

    z1_singlewrite(TXWTI, 0x01);                    // Disable any ATX wake-on-timer
    z1_singlewrite(TXLTI, 0x31);                    // Disable any ATX wake-on-timer
    z1_singlewrite(TXSTI_0, 0x00);                  // Disable any ATX wake-on-timer
    z1_singlewrite(TXSTI_1, 0x00);                  // Disable any ATX wake-on-timer
    z1_singlewrite(TXMOD, 0x62);                    // Minimize ATX power consumption: no RF, TX power down, wake-on-interrupt

    #ifdef USELED
        ledsequence = LED_FAILURE;                  // Blink in a fast on-off-on-off-on-off pattern 
        while (1) {
            mcu_wait_ms(64);                        // Use 4 * 64ms blink period, 64ms blink on time
            mcu_atxled(z1_rotate_led());            // Left-rotate the led sequence and apply ATX light according to MSB
        }
    #else
        while (1) {                                 // Terminate in infinite loop
        }       
    #endif

    return 0;                                       // Insert a return statement despite infinite loop

} // int main()