Philips Philips
This is early stages of my project, the idea of this project is to be able to mix a guitar with windows sounds in reverse such as instrumental background music or trance music perhaps or maybe another fellow guitarist you may have downloaded from the internet. Microphone or guitar pin is p19 I would use a microphone for drums:) and that it for the moment, the code makes the mbed act as usb speaker that excepts a guitar or microphone input, but with a twist it all in reverse like a guitar reverse effects pedal but only you can mix anything you can get from the internet or any windows sound.
Diff: USBDevice/USBAudio/USBAudio.cpp
- Revision:
- 0:7610d342c76e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBAudio/USBAudio.cpp Sun Jan 08 17:28:24 2012 +0000
@@ -0,0 +1,436 @@
+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+* and associated documentation files (the "Software"), to deal in the Software without
+* restriction, including without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or
+* substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#include "stdint.h"
+#include "USBAudio.h"
+#include "USBBusInterface.h"
+#include "USBAudio_Types.h"
+
+
+
+USBAudio::USBAudio(uint32_t frequency, uint8_t channel_nb, uint16_t vendor_id, uint16_t product_id, uint16_t product_release): USBDevice(vendor_id, product_id, product_release) {
+ mute = 0;
+ volCur = 0x0080;
+ volMin = 0x0000;
+ volMax = 0x0100;
+ volRes = 0x0004;
+ available = false;
+
+ FREQ = frequency;
+
+ this->channel_nb = channel_nb;
+
+ // stereo -> *2, mono -> *1
+ PACKET_SIZE_ISO = (FREQ / 500) * channel_nb;
+
+ // STEREO -> left and right
+ channel_config = (channel_nb == 1) ? CHANNEL_M : CHANNEL_L + CHANNEL_R;
+
+ SOF_handler = false;
+
+ buf_stream = NULL;
+
+ // connect the device
+ USBDevice::connect();
+}
+
+bool USBAudio::read(uint8_t * buf) {
+ buf_stream = buf;
+ while (!available);
+ available = false;
+ buf_stream = NULL;
+ return true;
+}
+
+bool USBAudio::readNB(uint8_t * buf) {
+ buf_stream = buf;
+ SOF_handler = false;
+ while (!SOF_handler);
+ if (available) {
+ available = false;
+ buf_stream = NULL;
+ return true;
+ }
+ buf_stream = NULL;
+ return false;
+}
+
+
+float USBAudio::getVolume() {
+ return (mute) ? 0.0 : (float)volCur/(float)volMax;
+}
+
+
+// Called in ISR context on each start of frame
+void USBAudio::SOF(int frameNumber) {
+ uint16_t size = 0;
+
+ // read the isochronous endpoint
+ if (buf_stream != NULL) {
+ USBDevice::readEP_NB(EP3OUT, buf_stream, &size, PACKET_SIZE_ISO);
+ }
+
+ // if we read something, modify the flag "available"
+ available = (size) ? true : false;
+
+ // activate readings on the isochronous
+ readStart(EP3OUT, PACKET_SIZE_ISO);
+
+ SOF_handler = true;
+}
+
+
+// Called in ISR context
+// Set configuration. Return false if the configuration is not supported.
+bool USBAudio::USBCallback_setConfiguration(uint8_t configuration) {
+ if (configuration != DEFAULT_CONFIGURATION) {
+ return false;
+ }
+
+ // Configure isochronous endpoint
+ realiseEndpoint(EP3OUT, PACKET_SIZE_ISO, ISOCHRONOUS);
+
+ // activate readings on this endpoint
+ readStart(EP3OUT, PACKET_SIZE_ISO);
+ return true;
+}
+
+
+// Called in ISR context
+// Set alternate setting. Return false if the alternate setting is not supported
+bool USBAudio::USBCallback_setInterface(uint16_t interface, uint8_t alternate) {
+ if (interface == 0 && alternate == 0) {
+ return true;
+ }
+ if (interface == 1 && (alternate == 0 || alternate == 1)) {
+ return true;
+ }
+ return false;
+}
+
+
+
+// Called in ISR context
+// Called by USBDevice on Endpoint0 request
+// This is used to handle extensions to standard requests and class specific requests.
+// Return true if class handles this request
+bool USBAudio::USBCallback_request() {
+ bool success = false;
+ CONTROL_TRANSFER * transfer = getTransferPtr();
+
+ // Process class-specific requests
+ if (transfer->setup.bmRequestType.Type == CLASS_TYPE) {
+
+ // Feature Unit: Interface = 0, ID = 2
+ if (transfer->setup.wIndex == 0x0200) {
+
+ // Master Channel
+ if ((transfer->setup.wValue & 0xff) == 0) {
+
+ switch (transfer->setup.wValue >> 8) {
+ case MUTE_CONTROL:
+ switch (transfer->setup.bRequest) {
+ case REQUEST_GET_CUR:
+ transfer->remaining = 1;
+ transfer->ptr = &mute;
+ transfer->direction = DEVICE_TO_HOST;
+ success = true;
+ break;
+
+ case REQUEST_SET_CUR:
+ transfer->remaining = 1;
+ transfer->notify = true;
+ transfer->direction = HOST_TO_DEVICE;
+ success = true;
+ break;
+ default:
+ break;
+ }
+ break;
+ case VOLUME_CONTROL:
+ switch (transfer->setup.bRequest) {
+ case REQUEST_GET_CUR:
+ transfer->remaining = 2;
+ transfer->ptr = (uint8_t *)&volCur;
+ transfer->direction = DEVICE_TO_HOST;
+ success = true;
+ break;
+ case REQUEST_GET_MIN:
+ transfer->remaining = 2;
+ transfer->ptr = (uint8_t *)&volMin;
+ transfer->direction = DEVICE_TO_HOST;
+ success = true;
+ break;
+ case REQUEST_GET_MAX:
+ transfer->remaining = 2;
+ transfer->ptr = (uint8_t *)&volMax;
+ transfer->direction = DEVICE_TO_HOST;
+ success = true;
+ break;
+ case REQUEST_GET_RES:
+ transfer->remaining = 2;
+ transfer->ptr = (uint8_t *)&volRes;
+ transfer->direction = DEVICE_TO_HOST;
+ success = true;
+ break;
+
+ case REQUEST_SET_CUR:
+ transfer->remaining = 2;
+ transfer->notify = true;
+ transfer->direction = HOST_TO_DEVICE;
+ success = true;
+ break;
+ case REQUEST_SET_MIN:
+ transfer->remaining = 2;
+ transfer->notify = true;
+ transfer->direction = HOST_TO_DEVICE;
+ success = true;
+ break;
+ case REQUEST_SET_MAX:
+ transfer->remaining = 2;
+ transfer->notify = true;
+ transfer->direction = HOST_TO_DEVICE;
+ success = true;
+ break;
+ case REQUEST_SET_RES:
+ transfer->remaining = 2;
+ transfer->notify = true;
+ transfer->direction = HOST_TO_DEVICE;
+ success = true;
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ }
+ return success;
+}
+
+
+// Called in ISR context when a data OUT stage has been performed
+void USBAudio::USBCallback_requestCompleted(uint8_t * buf, uint16_t length) {
+ uint16_t data = *((uint16_t *)buf);
+ CONTROL_TRANSFER * transfer = getTransferPtr();
+ switch (transfer->setup.wValue >> 8) {
+ case MUTE_CONTROL:
+ switch (transfer->setup.bRequest) {
+ case REQUEST_SET_CUR:
+ mute = data & 0xff;
+ updateVol.call();
+ break;
+ default:
+ break;
+ }
+ break;
+ case VOLUME_CONTROL:
+ switch (transfer->setup.bRequest) {
+ case REQUEST_SET_CUR:
+ volCur = data;
+ updateVol.call();
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+
+
+#define TOTAL_DESCRIPTOR_LENGTH ((1 * CONFIGURATION_DESCRIPTOR_LENGTH) \
+ + (3 * INTERFACE_DESCRIPTOR_LENGTH) \
+ + (1 * CONTROL_INTERFACE_DESCRIPTOR_LENGTH) \
+ + (1 * INPUT_TERMINAL_DESCRIPTOR_LENGTH) \
+ + (1 * FEATURE_UNIT_DESCRIPTOR_LENGTH) \
+ + (1 * OUTPUT_TERMINAL_DESCRIPTOR_LENGTH) \
+ + (1 * STREAMING_INTERFACE_DESCRIPTOR_LENGTH) \
+ + (1 * FORMAT_TYPE_I_DESCRIPTOR_LENGTH) \
+ + (1 * (ENDPOINT_DESCRIPTOR_LENGTH + 2)) \
+ + (1 * STREAMING_ENDPOINT_DESCRIPTOR_LENGTH) )
+
+#define TOTAL_CONTROL_INTF_LENGTH (CONTROL_INTERFACE_DESCRIPTOR_LENGTH + \
+ INPUT_TERMINAL_DESCRIPTOR_LENGTH + \
+ FEATURE_UNIT_DESCRIPTOR_LENGTH + \
+ OUTPUT_TERMINAL_DESCRIPTOR_LENGTH)
+
+uint8_t * USBAudio::configurationDesc() {
+ static uint8_t configDescriptor[] = {
+ // Configuration 1
+ CONFIGURATION_DESCRIPTOR_LENGTH, // bLength
+ CONFIGURATION_DESCRIPTOR, // bDescriptorType
+ LSB(TOTAL_DESCRIPTOR_LENGTH), // wTotalLength (LSB)
+ MSB(TOTAL_DESCRIPTOR_LENGTH), // wTotalLength (MSB)
+ 0x02, // bNumInterfaces
+ DEFAULT_CONFIGURATION, // bConfigurationValue
+ 0x00, // iConfiguration
+ 0x80, // bmAttributes
+ 50, // bMaxPower
+
+ // Interface 0, Alternate Setting 0, Audio Control
+ INTERFACE_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR, // bDescriptorType
+ 0x00, // bInterfaceNumber
+ 0x00, // bAlternateSetting
+ 0x00, // bNumEndpoints
+ AUDIO_CLASS, // bInterfaceClass
+ SUBCLASS_AUDIOCONTROL, // bInterfaceSubClass
+ 0x00, // bInterfaceProtocol
+ 0x00, // iInterface
+
+
+ // Audio Control Interface
+ CONTROL_INTERFACE_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ CONTROL_HEADER, // bDescriptorSubtype
+ LSB(0x0100), // bcdADC (LSB)
+ MSB(0x0100), // bcdADC (MSB)
+ LSB(TOTAL_CONTROL_INTF_LENGTH), // wTotalLength
+ MSB(TOTAL_CONTROL_INTF_LENGTH), // wTotalLength
+ 0x01, // bInCollection
+ 0x01, // baInterfaceNr
+
+ // Audio Input Terminal
+ INPUT_TERMINAL_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ CONTROL_INPUT_TERMINAL, // bDescriptorSubtype
+ 0x01, // bTerminalID
+ LSB(TERMINAL_USB_STREAMING), // wTerminalType
+ MSB(TERMINAL_USB_STREAMING), // wTerminalType
+ 0x00, // bAssocTerminal
+ channel_nb, // bNrChannels
+ LSB(channel_config), // wChannelConfig
+ MSB(channel_config), // wChannelConfig
+ 0x00, // iChannelNames
+ 0x00, // iTerminal
+
+ // Audio Feature Unit
+ FEATURE_UNIT_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ CONTROL_FEATURE_UNIT, // bDescriptorSubtype
+ 0x02, // bUnitID
+ 0x01, // bSourceID
+ 0x01, // bControlSize
+ CONTROL_MUTE |
+ CONTROL_VOLUME, // bmaControls(0)
+ 0x00, // bmaControls(1)
+ 0x00, // iTerminal
+
+ // Audio Output Terminal
+ OUTPUT_TERMINAL_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ CONTROL_OUTPUT_TERMINAL, // bDescriptorSubtype
+ 0x03, // bTerminalID
+ LSB(TERMINAL_SPEAKER), // wTerminalType
+ MSB(TERMINAL_SPEAKER), // wTerminalType
+ 0x00, // bAssocTerminal
+ 0x02, // bSourceID
+ 0x00, // iTerminal
+
+
+ // Interface 1, Alternate Setting 0, Audio Streaming - Zero Bandwith
+ INTERFACE_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR, // bDescriptorType
+ 0x01, // bInterfaceNumber
+ 0x00, // bAlternateSetting
+ 0x00, // bNumEndpoints
+ AUDIO_CLASS, // bInterfaceClass
+ SUBCLASS_AUDIOSTREAMING, // bInterfaceSubClass
+ 0x00, // bInterfaceProtocol
+ 0x00, // iInterface
+
+ // Interface 1, Alternate Setting 1, Audio Streaming - Operational
+ INTERFACE_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR, // bDescriptorType
+ 0x01, // bInterfaceNumber
+ 0x01, // bAlternateSetting
+ 0x01, // bNumEndpoints
+ AUDIO_CLASS, // bInterfaceClass
+ SUBCLASS_AUDIOSTREAMING, // bInterfaceSubClass
+ 0x00, // bInterfaceProtocol
+ 0x00, // iInterface
+
+ // Audio Streaming Interface
+ STREAMING_INTERFACE_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ STREAMING_GENERAL, // bDescriptorSubtype
+ 0x01, // bTerminalLink
+ 0x00, // bDelay
+ LSB(FORMAT_PCM), // wFormatTag
+ MSB(FORMAT_PCM), // wFormatTag
+
+ // Audio Type I Format
+ FORMAT_TYPE_I_DESCRIPTOR_LENGTH, // bLength
+ INTERFACE_DESCRIPTOR_TYPE, // bDescriptorType
+ STREAMING_FORMAT_TYPE, // bDescriptorSubtype
+ FORMAT_TYPE_I, // bFormatType
+ channel_nb, // bNrChannels
+ 0x02, // bSubFrameSize
+ 16, // bBitResolution
+ 0x01, // bSamFreqType
+ LSB(FREQ), // tSamFreq
+ (FREQ >> 8) & 0xff, // tSamFreq
+ (FREQ >> 16) & 0xff, // tSamFreq
+
+ // Endpoint - Standard Descriptor
+ ENDPOINT_DESCRIPTOR_LENGTH + 2, // bLength
+ ENDPOINT_DESCRIPTOR, // bDescriptorType
+ PHY_TO_DESC(EPISO_OUT), // bEndpointAddress
+ E_ISOCHRONOUS, // bmAttributes
+ LSB(PACKET_SIZE_ISO), // wMaxPacketSize
+ MSB(PACKET_SIZE_ISO), // wMaxPacketSize
+ 0x01, // bInterval
+ 0x00, // bRefresh
+ 0x00, // bSynchAddress
+
+ // Endpoint - Audio Streaming
+ STREAMING_ENDPOINT_DESCRIPTOR_LENGTH, // bLength
+ ENDPOINT_DESCRIPTOR_TYPE, // bDescriptorType
+ ENDPOINT_GENERAL, // bDescriptor
+ 0x00, // bmAttributes
+ 0x00, // bLockDelayUnits
+ LSB(0x0000), // wLockDelay
+ MSB(0x0000), // wLockDelay
+
+ // Terminator
+ 0 // bLength
+ };
+ return configDescriptor;
+}
+
+uint8_t * USBAudio::stringIinterfaceDesc() {
+ static uint8_t stringIinterfaceDescriptor[] = {
+ 0x0c, //bLength
+ STRING_DESCRIPTOR, //bDescriptorType 0x03
+ 'A',0,'u',0,'d',0,'i',0,'o',0 //bString iInterface - Audio
+ };
+ return stringIinterfaceDescriptor;
+}
+
+uint8_t * USBAudio::stringIproductDesc() {
+ static uint8_t stringIproductDescriptor[] = {
+ 0x16, //bLength
+ STRING_DESCRIPTOR, //bDescriptorType 0x03
+ 'M',0,'b',0,'e',0,'d',0,' ',0,'A',0,'u',0,'d',0,'i',0,'o',0 //bString iProduct - Mbed Audio
+ };
+ return stringIproductDescriptor;
+}