kopia lustrzana https://github.com/skuep/AIOC
318 wiersze
9.4 KiB
C
318 wiersze
9.4 KiB
C
#include "usb_audio.h"
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#include "tusb.h"
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#ifndef AUDIO_SAMPLE_RATE
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#define AUDIO_SAMPLE_RATE 48000
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#endif
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// Audio controls
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// Current states
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bool mute[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
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uint16_t volume[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
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uint32_t sampFreq;
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uint8_t clkValid;
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// Range states
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audio_control_range_2_n_t(1) volumeRng[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX+1]; // Volume range state
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audio_control_range_4_n_t(1) sampleFreqRng; // Sample frequency range state
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// Audio test data
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uint16_t test_buffer_audio[CFG_TUD_AUDIO_EP_SZ_IN/2];
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uint16_t startVal = 0;
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//--------------------------------------------------------------------+
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// Application Callback API Implementations
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//--------------------------------------------------------------------+
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// Invoked when audio class specific set request received for an EP
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bool tud_audio_set_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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(void) pBuff;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t ep = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) ep;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific set request received for an interface
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bool tud_audio_set_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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(void) pBuff;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) itf;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific set request received for an entity
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bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
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(void) itf;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// If request is for our feature unit
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if ( entityID == 2 )
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{
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switch ( ctrlSel )
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{
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case AUDIO_FU_CTRL_MUTE:
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// Request uses format layout 1
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TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_1_t));
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mute[channelNum] = ((audio_control_cur_1_t*) pBuff)->bCur;
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TU_LOG2(" Set Mute: %d of channel: %u\r\n", mute[channelNum], channelNum);
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return true;
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case AUDIO_FU_CTRL_VOLUME:
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// Request uses format layout 2
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TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_2_t));
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volume[channelNum] = (uint16_t) ((audio_control_cur_2_t*) pBuff)->bCur;
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TU_LOG2(" Set Volume: %d dB of channel: %u\r\n", volume[channelNum], channelNum);
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return true;
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an EP
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bool tud_audio_get_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t ep = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) ep;
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// return tud_control_xfer(rhport, p_request, &tmp, 1);
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an interface
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bool tud_audio_get_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) itf;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an entity
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bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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// uint8_t itf = TU_U16_LOW(p_request->wIndex); // Since we have only one audio function implemented, we do not need the itf value
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uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
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// Input terminal (Microphone input)
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if (entityID == AUDIO_CTRL_ID_MIC_INPUT)
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{
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switch ( ctrlSel )
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{
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case AUDIO_TE_CTRL_CONNECTOR:
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{
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// The terminal connector control only has a get request with only the CUR attribute.
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audio_desc_channel_cluster_t ret;
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// Those are dummy values for now
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ret.bNrChannels = 1;
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ret.bmChannelConfig = 0;
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ret.iChannelNames = 0;
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TU_LOG2(" Get terminal connector\r\n");
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return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
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}
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break;
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// Unknown/Unsupported control selector
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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// Feature unit
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if (entityID == AUDIO_CTRL_ID_MIC_FUNIT)
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{
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switch ( ctrlSel )
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{
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case AUDIO_FU_CTRL_MUTE:
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// Audio control mute cur parameter block consists of only one byte - we thus can send it right away
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// There does not exist a range parameter block for mute
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TU_LOG2(" Get Mute of channel: %u\r\n", channelNum);
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return tud_control_xfer(rhport, p_request, &mute[channelNum], 1);
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case AUDIO_FU_CTRL_VOLUME:
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switch ( p_request->bRequest )
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{
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case AUDIO_CS_REQ_CUR:
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TU_LOG2(" Get Volume of channel: %u\r\n", channelNum);
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return tud_control_xfer(rhport, p_request, &volume[channelNum], sizeof(volume[channelNum]));
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case AUDIO_CS_REQ_RANGE:
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TU_LOG2(" Get Volume range of channel: %u\r\n", channelNum);
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// Copy values - only for testing - better is version below
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audio_control_range_2_n_t(1)
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ret;
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ret.wNumSubRanges = 1;
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ret.subrange[0].bMin = -90; // -90 dB
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ret.subrange[0].bMax = 90; // +90 dB
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ret.subrange[0].bRes = 1; // 1 dB steps
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return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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break;
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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// Clock Source unit
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if ( entityID == AUDIO_CTRL_ID_CLOCK )
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{
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switch ( ctrlSel )
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{
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case AUDIO_CS_CTRL_SAM_FREQ:
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// channelNum is always zero in this case
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switch ( p_request->bRequest )
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{
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case AUDIO_CS_REQ_CUR:
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TU_LOG2(" Get Sample Freq.\r\n");
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return tud_control_xfer(rhport, p_request, &sampFreq, sizeof(sampFreq));
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case AUDIO_CS_REQ_RANGE:
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TU_LOG2(" Get Sample Freq. range\r\n");
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return tud_control_xfer(rhport, p_request, &sampleFreqRng, sizeof(sampleFreqRng));
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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break;
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case AUDIO_CS_CTRL_CLK_VALID:
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// Only cur attribute exists for this request
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TU_LOG2(" Get Sample Freq. valid\r\n");
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return tud_control_xfer(rhport, p_request, &clkValid, sizeof(clkValid));
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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TU_LOG2(" Unsupported entity: %d\r\n", entityID);
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return false; // Yet not implemented
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}
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bool tud_audio_tx_done_pre_load_cb(uint8_t rhport, uint8_t itf, uint8_t ep_in, uint8_t cur_alt_setting)
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{
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(void) rhport;
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(void) itf;
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(void) ep_in;
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(void) cur_alt_setting;
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tud_audio_write ((uint8_t *)test_buffer_audio, CFG_TUD_AUDIO_EP_SZ_IN);
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return true;
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}
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bool tud_audio_tx_done_post_load_cb(uint8_t rhport, uint16_t n_bytes_copied, uint8_t itf, uint8_t ep_in, uint8_t cur_alt_setting)
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{
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(void) rhport;
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(void) n_bytes_copied;
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(void) itf;
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(void) ep_in;
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(void) cur_alt_setting;
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for (size_t cnt = 0; cnt < CFG_TUD_AUDIO_EP_SZ_IN/2; cnt++)
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{
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test_buffer_audio[cnt] = startVal++;
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}
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return true;
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}
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bool tud_audio_set_itf_close_EP_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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(void) p_request;
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startVal = 0;
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return true;
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}
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void USB_AudioInit(void)
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{
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sampFreq = AUDIO_SAMPLE_RATE;
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clkValid = 1;
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sampleFreqRng.wNumSubRanges = 1;
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sampleFreqRng.subrange[0].bMin = AUDIO_SAMPLE_RATE;
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sampleFreqRng.subrange[0].bMax = AUDIO_SAMPLE_RATE;
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sampleFreqRng.subrange[0].bRes = 0;
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}
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