/*******************************************************************************
* Function Name: main
********************************************************************************
* Summary:
* Main routine does following tasks.
* - Initializes all the components for digital audio
* - Initializes all the components for user interface and other system functions
* - Handles hot plug of USB host - Mac/PC/(any USB Host)
* - Handles USB host disconnection events
* - Handles dynamic sample rate change, audio stream start/stop events
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void main(void)
{
/* Setup the Audio pipe from USB to I2S. After the call to this API, the system clock architecture changes
* from start up mode to idle mode. System clocks such as PLL are shutdown. Any of the application
* layer components which are using PLL as the source of clock would seize to function after this function call.
* The clocks are shutdown to minimize idle mode current consumption. The clocks are turned back on when
* Audio Input or Output stream becomes active. Details of all the system clocks in idle mode
* are shown in "Idle Mode Clock Info" page of the TopDesign. */
ConfigureAudioPath();
/* Initialize the components other than audio components such as system timer and watchdog.
* Also configure the clock sources of all these components such that these components work in both idle and active modes.
* Details of all the system clocks in idle mode are shown in "Idle Mode Clock Info" page of the TopDesign. */
ConfigureApplication();
/* USER_CODE: Placeholder for users to add any other application specific initialization code.
* CAUTION: System will be in Idle mode at this point, which means some of the clocks are not active.
* Details of all the system clocks in idle mode are shown in "Idle Mode Clock Info" page of the TopDesign. */
while(FOREVER)
{
/* Check for USB enumeration with USB host */
if(IsUSBConfigured() != FALSE)
{
/* Accessory initialization routine after USB enumeration completion
* Also loads the EP's when audio playback/recording starts */
ServiceUSB();
/* Enter low power mode if Audio stream is inactive. In low power mode all the audio components
* (e.g., I2S) and some of the system clocks such as PLL are shutdown.
* Details of all the system clocks in idle mode are shown in "Idle Mode Clock Info" page of the TopDesign.
* Details of all the system clocks in active mode are shown in "Active Mode Clock 44.1/48 kHz" page of the TopDesign. */
HandleDigitalAudioLowPowerMode();
/* USB audio sampling frequency change handler.
* Checks whether host has changed audio sampling rate.
* Configures AudioClkGen to generate a clock synchonized to new audio sampling rate.
* Note: Change the I2C address of codec in Codec.h file, according to Codec used in your design.
* Currently, codec I2C address is set to Cirrus codec (CS42L51) address. */
HandleSamplingFrequencyChangeRequest();
}
HandleApplicationInterface(); /* Handles all the audio playback/record related application layer functions */
HandleUSBHostInterface(); /* Check for PC/Mac USB Audio device connection */
HandleApplicationTimerTick(); /* Handle all the timeout events */
#ifdef ENABLE_WATCHDOG
CyWdtClear(); /* Service watchdog timer */
#endif
#ifndef ENABLE_DIGITAL_AUDIO_OUT_ONLY
HandleAudioInBuffer(); /* Clear audio IN buffer when IN stream is stopped */
#endif
}
}
/*******************************************************************************
* Function Name: ServiceUSB
********************************************************************************
* Summary: This routine performs tasks that should be done soon after USB
* enumeration is completed (configure DMA, initialize state machine etc).
* When the USB configuration is changed, this routine reinitializes all
* the USB endpoints as required by the application.
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void ServiceUSB(void)
{
CYBIT macPC_flag=FALSE;
if(USB_INTERFACE_INACTIVE == USBDeviceState)
{
USBDeviceState = USB_INIT_AFTER_ENUMERATION_REQUIRED;
}
/* Initialization sequence for every USB host enumeration event */
if(USBDeviceState == USB_INIT_AFTER_ENUMERATION_REQUIRED)
{
uint16 index = 0;
USBDeviceState = USB_INIT_AFTER_ENUMERATION_COMPLETED;
SetAppleDeviceAudioSource(AUDIO_SOURCE_DIGITAL);
macPC_flag = IsMacPCConnected();
#if(USBFS_EP_MM == USBFS__EP_DMAAUTO)
/* USER_CODE: [Audio Buffers] Add a separate for loop if the playback and recording audio buffer size are
* not equal */
for(index=0; index< OUT_AUDIOMAXPKT; index++)
{
#ifndef ENABLE_DIGITAL_AUDIO_OUT_ONLY
inRam[index] = 0;
#endif
#ifndef ENABLE_DIGITAL_AUDIO_IN_ONLY
outRam[index] = 0;
#endif
}
#ifndef ENABLE_DIGITAL_AUDIO_OUT_ONLY
inCnt = IN_AUDIOMAXPKT;
#endif
#endif
#ifdef CDC_ENABLED
USBUARTStart(); /* Initializes the USB UART interface */
#endif
/* Configure the HID input endpoint buffer for Mac/PC playlist control */
if(macPC_flag)
{
USBFS_LoadInEP(MAC_PC_HID_CONTROL_ENDPOINT, (uint8 *)&playlistControlReport, sizeof(playlistControlReport));
#ifdef PHONE_CONTROL_ENABLED
USBFS_ReadOutEP(MAC_PC_HID_OUT_ENDPOINT, &hidOutReport, sizeof(hidOutReport));
USBFS_EnableOutEP(MAC_PC_HID_OUT_ENDPOINT);
#endif
}
/* If Aux is not currently configured, then switch to digital audio mode */
if(IS_AUX_NOT_SELECTED())
{
ConfigureDigitalAudioDMA();
}
else
{
#ifdef LCD_MODULE_ENABLED
/* Else Display Aux Configured message on the LCD */
LCD2LineDisplay("Analog Loopback ",
" ");
#endif
}
/* USER_CODE: [USB enumeration] placeholder for initializing custom user code after the USB host enumerates the
* accessory. This routine will be called once per accessory connection after the host issues SET_CONFIGURATION
* request */
}
#ifdef MIDI_ENABLED
if (midiEPInitialized == FALSE || usbReset)
{
/* Initialize MIDI only when a valid USB host is connected */
if ((IsUSBConfigured() && IsMacPCConnected()))
{
USBFS_MIDI_EP_Init();
/* USB Component internally sets the priority of the UART TX and RX ISRs to 4 and 2 respectively, change the
* interrupt priority in the application code to match the system interrupt setup */
CyIntSetPriority(MIDI1_UART_TX_VECT_NUM, MIDI_UART_INTERRUPT_PRIORITY_SIX);
CyIntSetPriority(MIDI1_UART_RX_VECT_NUM, MIDI_UART_INTERRUPT_PRIORITY_FIVE);
#if (USBFS_MIDI_EXT_MODE >= USBFS_TWO_EXT_INTRF)
CyIntSetPriority(MIDI2_UART_TX_VECT_NUM, MIDI_UART_INTERRUPT_PRIORITY_SIX);
CyIntSetPriority(MIDI2_UART_RX_VECT_NUM, MIDI_UART_INTERRUPT_PRIORITY_FIVE);
#endif
midiEPInitialized = TRUE;
usbReset = 0;
}
}
if(USBFS_midiInPointer%USBFS_EVENT_LENGTH == 0 && USBFS_midiInPointer!=0)
{
if(midiInWaitTimer == 0)
{
midiInWaitTimer = MIDI_IN_EP_WAIT_TIME;
USBFS_MIDI_IN_EP_Service();
}
}
else
{
midiInWaitTimer = MIDI_IN_EP_WAIT_TIME;
}
#endif
/* USBFS_IsConfigurationChanged() is a clear on read status update therefore, only one read of
* USBFS_IsConfigurationChanged() should ever exist in user code */
if(USBFS_IsConfigurationChanged())
{
macPC_flag = IsMacPCConnected();
#ifndef ENABLE_DIGITAL_AUDIO_IN_ONLY
/* Get Alternate setting */
altSetting[AUDIO_OUT_INTERFACE_INDEX] = (macPC_flag? USBFS_GetInterfaceSetting(1):USBFS_GetInterfaceSetting(2));
/* ByteSwap control register bit is set to 1 if alt setting 2 is selected so that
* Byte swap digital logic processes data as 16 bits. ByteSwap control register is set to 0
* if alt setting 1 is selected and byte swap processes data as 24 bits */
if (altSetting[AUDIO_OUT_INTERFACE_INDEX]==ALT_SETTING_ACTIVE_24_BIT)
{
ByteSwap_Tx_CONTROL_REG = ByteSwap_Tx_CONTROL_REG & (~ByteSwap_Tx_RES_CTRL_16);
}
else if (altSetting[AUDIO_OUT_INTERFACE_INDEX]==ALT_SETTING_ACTIVE_16_BIT)
{
ByteSwap_Tx_CONTROL_REG = ByteSwap_Tx_CONTROL_REG | ByteSwap_Tx_RES_CTRL_16;
}
/* Arming the audio out EP if it is not zero bandwidth alt setting */
if (altSetting[AUDIO_OUT_INTERFACE_INDEX]!= ALT_SETTING_ZERO_BANDWIDTH &&
(CY_GET_REG8(USBFS_SIE_EP1_CR0_PTR + ((AUDIO_OUT_ENDPOINT - USBFS_EP1) << USBFS_EPX_CNTX_ADDR_SHIFT)) & USBFS_MODE_MASK)
== USBFS_MODE_NAK_IN_OUT)
{
/* Init DMA configurations for audio OUT EP */
USBFS_ReadOutEP(AUDIO_OUT_ENDPOINT, &outRam[0], OUT_AUDIOMAXPKT);
USBFS_EnableOutEP(AUDIO_OUT_ENDPOINT);
}
#endif
#ifndef ENABLE_DIGITAL_AUDIO_OUT_ONLY
#ifndef ENABLE_DIGITAL_AUDIO_IN_ONLY
if(altSetting[AUDIO_IN_INTERFACE_INDEX] != (macPC_flag? USBFS_GetInterfaceSetting(2):USBFS_GetInterfaceSetting(3)))
{
altSetting[AUDIO_IN_INTERFACE_INDEX] = (macPC_flag? USBFS_GetInterfaceSetting(2):USBFS_GetInterfaceSetting(3));
#else
if(altSetting[AUDIO_IN_INTERFACE_INDEX] != (macPC_flag? USBFS_GetInterfaceSetting(1):USBFS_GetInterfaceSetting(2)))
{
altSetting[AUDIO_IN_INTERFACE_INDEX] = (macPC_flag? USBFS_GetInterfaceSetting(1):USBFS_GetInterfaceSetting(2));
#endif
/* Setting the ByteSwap control register bit to 0 regardless of alt setting is selected. Because audio in
* interface both the alternate settings alt setting1 and alt setting 2 both use 3 byte subframe size. */
ByteSwap_Rx_CONTROL_REG = ByteSwap_Rx_CONTROL_REG & (~ByteSwap_Rx_RES_CTRL_16);
/* Arming the audio in EP if it is not zero bandwidth alt setting */
if (altSetting[AUDIO_IN_INTERFACE_INDEX]!= ALT_SETTING_ZERO_BANDWIDTH &&
(CY_GET_REG8(USBFS_SIE_EP1_CR0_PTR + ((AUDIO_IN_ENDPOINT - USBFS_EP1) << USBFS_EPX_CNTX_ADDR_SHIFT)) & USBFS_MODE_MASK)
== USBFS_MODE_NAK_IN_OUT)
{
/* Init DMA configurations for audio IN EP */
inCnt = IN_AUDIOMAXPKT;
USBFS_LoadInEP(AUDIO_IN_ENDPOINT, &inRam[0], inCnt);
/* Pre-arm first audio IN request */
USBFS_LoadInEP(AUDIO_IN_ENDPOINT, USBFS_NULL, inCnt);
}
}
#endif
/* USER_CODE: [USB configuration changed] Placeholder for adding additional USB endpoint initialization code
* when the host issues either a SET_INTERFACE or SET_CONFIGURATION request to the accessory. After receiving
* a SET_INTERFACE request from the host, the endpoint belonging to the alternate setting being configured
* by the USB host is reset and must be reinitialized here for proper operation of the USB block */
}
}
/*******************************************************************************
* Function Name: ServiceUSBSuspend
********************************************************************************
* Summary:
* This function handles USB suspend event from USB host and forces PSoC 3
* to enter low power mode. Once the USB resume event is detected, PSoC3
* wakes up and starts operating in normal mode.
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
#ifdef HANDLE_USB_SUSPEND
void ServiceUSBSuspend(void)
{
if(!IsMacPCConnected() || ! USBFS_initVar)
{
return;
}
/* Check if the host is active */
if(USBFS_bCheckActivity() != 0 )
{
usbActivityCounter = 0;
}
else
{
usbActivityCounter++;
}
/* USB Suspend event is lack of greater than 3 consecutive SOF's */
if(usbActivityCounter > USB_SUSPEND_TIME_TICKS )
{
/* The debounce delay is taken care by increasing the suspend time to 40ms (5 * 8ms) */
if(IsMacPCConnected() && IsUSBConfigured())
{
/* USER_CODE: [USB suspend] Placeholder for configuring ALL the additional components added by the user in
* sleep mode before calling USB suspend/PSoC 3 sleep API */
#ifdef LCD_MODULE_ENABLED
LCD_Position(0,0);
LCD_PrintString(" USB Suspend ");
#endif
/* If the accessory is not in low power mode, enter low power mode on seeing a USB suspend */
if(!lowPowerIdle)
{
lowPowerIdle = TRUE;
StopAudioComponents(); /* Changes to 24 MHz IMO for USB */
StopAnalogAudioComponents(); /* Turn OFF Analog path for Audio-In/iPod Analog */
}
if(!midiPowerIdle)
{
if(!lowPowerIdle)
{
StopAudioComponents(); /* Changes to 24 MHz IMO for USB */
}
CyPins_SetPin(PSOC_MIDI_PWR_0); /* Turn off the MIDI I/O hardware */
midiPowerIdle = TRUE; /* MIDI low power mode enabled */
}
CyPins_ClearPin(PSOC_CODEC_PWR_0); /* Turn off the regulator to reduce suspend mode current */
USBFS_Suspend();
I2C_Master_Sleep(); /* Configure I2C master block in sleep mode */
#ifdef CAPSENSE_ENABLED
while(CapSense_IsBusy()); /* Wait for current scan to complete */
CapSense_Sleep();
#endif
#ifdef MIDI_ENABLED
MIDI1_UART_Sleep();
#if (USBFS_MIDI_EXT_MODE >= USBFS_TWO_EXT_INTRF)
MIDI2_UART_Sleep();
#endif
#endif
CyPmSaveClocks();
CyPmSleep(PM_SLEEP_TIME_NONE, PM_SLEEP_SRC_PICU); /* PSoC 3 is in sleep mode */
CyPmRestoreClocks();
USBFS_Resume();
I2C_Master_Wakeup();
#ifdef CAPSENSE_ENABLED
CapSense_Wakeup();
CapSense_IntClock_SetSource(CYCLK_SRC_SEL_IMO);
#endif
#ifdef MIDI_ENABLED
MIDI1_UART_Wakeup();
#if (USBFS_MIDI_EXT_MODE >= USBFS_TWO_EXT_INTRF)
MIDI2_UART_Wakeup();
#endif
#endif
CyPins_SetPin(PSOC_CODEC_PWR_0); /* Turn ON the CODEC regulator after wake up */
#ifdef WINDOWS7_WORKAROUND
if(USBFS_GetConfiguration() != 0)
{
USBFS_configurationChanged = USBFS_TRUE;
USBFS_Config(USBFS_FALSE);
}
#endif
#ifdef LCD_MODULE_ENABLED
LCD_Position(0,0);
LCD_PrintString("Mac/PC Interface");
#endif
/* USER_CODE: [USB wakeup] Placeholder for re-configuring ALL the additional components added by the user in
* wakeup mode after calling USB wakeup */
}
usbActivityCounter = 0;
/* After coming out of USB suspend, MIDI end point should be re-initialized */
midiEPInitialized = 0;
}
}
#endif
/*******************************************************************************
* Function Name: HandlePCMacUSBInterface
********************************************************************************
* Summary: Checks if PC/Mac is connected/disconnected and start the USB component
*
* Parameters:
* void
*
* Return:
* void
*
*******************************************************************************/
void HandlePCMacUSBInterface(void)
{
/* If Aux mode is enabled, then Mac/PC connection disconnection is handled only when the system is not in
* aux In mode. For self powered case, Apple device connection is also checked before starting the Mac/PC
* interface */
if(IS_AUX_NOT_SELECTED() && !USBFS_initVar && IsMacPCConnected())
{
/* Switch the PSoC USB D+ and D- lines to USB Mini B */
CyPins_ClearPin(PSOC_USB_SEL_0);
/* Start the USB component when PC/Mac is connected */
USBFS_Start(PC_MAC_AUDIO_WITH_VOLUME_DEVICE, USBFS_DWR_VDDD_OPERATION);
USBDeviceState = USB_INIT_AFTER_ENUMERATION_REQUIRED;
#ifdef LCD_MODULE_ENABLED
if(IS_AUX_NOT_SELECTED())
{
LCD2LineDisplay("Mac/PC Interface",
" ");
}
#endif
#ifdef ENABLE_VOLUME_CONTROL
currentLCDVolume--; /* dirty the LCD volume and mute update flag to update volume and mute info on the LCD */
currentLCDMute--;
#endif
usbMiniBActive = TRUE;
/* USER_CODE: [Mac/PC connection] Placeholder for initializing components or external peripherals when the
* accessory is plugged into Mac/PC (USB VBus = High) */
}
/* Check for PC/Mac USB Audio device disconnection in self powered mode.
* In device powered mode project, no need of checking disconnection event as power is shut off
* as soon as USB cable is disconnected from USB mini connector. */
else if(usbMiniBActive && (USBFS_bGetConfiguration() || USBDeviceState == USB_INIT_AFTER_ENUMERATION_REQUIRED))
{
/* If VBUS voltage from mini B is now gone and was previous present then stop USB interface */
if(!IsMacPCConnected())
{
if(USBFS_initVar)
{
USBFS_Stop();
}
CyPins_SetPin(PSOC_USB_SEL_0); /* Switch the PSoC USB D+ and D- lines back to Apple device */
/* If Aux was not configured when PC is unplugged, then switch off CODEC */
if(!auxConfigured)
{
CyPins_ClearPin(PSOC_CODEC_RST_0); /* Hold CODEC in reset */
codecInit = FALSE;
}
usbMiniBActive = FALSE;
/* USER_CODE: [Mac/PC disconnection] Placeholder for shutting down components or external peripherals when
* the accessory is disconnected from Mac/PC (USB VBus transitioned from High to Low) */
}
}
}
/*******************************************************************************
* Function Name: EnableNAKBulkIN
********************************************************************************
* Summary: Enables the NAK interrupt on a USB endpoint
*
* Parameters:
* Endpoint number for which NAK interrupt is to be enabled
*
* Return:
* void
*
*******************************************************************************/
void EnableNAKBulkIN(uint8 bEPNumber)
{
uint8 index = (bEPNumber - USBFS_EP1) << USBFS_EPX_CNTX_ADDR_SHIFT;
if((CY_GET_REG8(&USBFS_SIE_EP1_CR0_PTR[index]) & USBFS_MODE_MASK) != USBFS_MODE_ACK_IN)
{
CY_SET_REG8(&USBFS_SIE_EP1_CR0_PTR[index],
CY_GET_REG8(&USBFS_SIE_EP1_CR0_PTR[index]) | NAK_IN_INTERRUPT_ENABLE_MASK);
}
}
