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-rw-r--r--examples/device/audio_4_channel_mic/src/main.c225
1 files changed, 84 insertions, 141 deletions
diff --git a/examples/device/audio_4_channel_mic/src/main.c b/examples/device/audio_4_channel_mic/src/main.c
index f78e48f0c..9b169e77e 100644
--- a/examples/device/audio_4_channel_mic/src/main.c
+++ b/examples/device/audio_4_channel_mic/src/main.c
@@ -31,10 +31,10 @@
* $ python3 plot_audio_samples.py
*/
-#include <stdlib.h>
+#include <math.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#include <math.h>
#include "bsp/board_api.h"
#include "tusb.h"
@@ -43,14 +43,14 @@
//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
-#define AUDIO_SAMPLE_RATE CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE
+#define AUDIO_SAMPLE_RATE CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE
/* Blink pattern
* - 250 ms : device not mounted
* - 1000 ms : device mounted
* - 2500 ms : device is suspended
*/
-enum {
+enum {
BLINK_NOT_MOUNTED = 250,
BLINK_MOUNTED = 1000,
BLINK_SUSPENDED = 2500,
@@ -60,31 +60,29 @@ static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
// Audio controls
// Current states
-bool mute[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
-uint16_t volume[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
+bool mute[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
+uint16_t volume[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1];// +1 for master channel 0
uint32_t sampFreq;
uint8_t clkValid;
// Range states
-audio_control_range_2_n_t(1) volumeRng[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX+1]; // Volume range state
-audio_control_range_4_n_t(1) sampleFreqRng; // Sample frequency range state
+audio_control_range_2_n_t(1) volumeRng[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1];// Volume range state
+audio_control_range_4_n_t(1) sampleFreqRng; // Sample frequency range state
// Audio test data, 4 channels muxed together, buffer[0] for CH0, buffer[1] for CH1, buffer[2] for CH2, buffer[3] for CH3
-uint16_t i2s_dummy_buffer[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX*CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE/1000];
+uint16_t i2s_dummy_buffer[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX * CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE / 1000];
void led_blinking_task(void);
void audio_task(void);
/*------------- MAIN -------------*/
-int main(void)
-{
+int main(void) {
board_init();
// init device stack on configured roothub port
tusb_rhport_init_t dev_init = {
- .role = TUSB_ROLE_DEVICE,
- .speed = TUSB_SPEED_AUTO
- };
+ .role = TUSB_ROLE_DEVICE,
+ .speed = TUSB_SPEED_AUTO};
tusb_init(BOARD_TUD_RHPORT, &dev_init);
if (board_init_after_tusb) {
@@ -101,25 +99,23 @@ int main(void)
sampleFreqRng.subrange[0].bRes = 0;
// Generate dummy data
- uint16_t * p_buff = i2s_dummy_buffer;
+ uint16_t *p_buff = i2s_dummy_buffer;
uint16_t dataVal = 0;
- for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
- {
+ for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE / 1000; cnt++) {
// CH0 saw wave
*p_buff++ = dataVal;
// CH1 inverted saw wave
- *p_buff++ = 3200 + AUDIO_SAMPLE_RATE/1000 - dataVal;
- dataVal+= 32;
+ *p_buff++ = 3200 + AUDIO_SAMPLE_RATE / 1000 - dataVal;
+ dataVal += 32;
// CH3 square wave
- *p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 3400:5000;
+ *p_buff++ = cnt < (AUDIO_SAMPLE_RATE / 1000 / 2) ? 3400 : 5000;
// CH4 sinus wave
- float t = 2*3.1415f * cnt / (AUDIO_SAMPLE_RATE/1000);
- *p_buff++ = (uint16_t)((int16_t)(sinf(t) * 750) + 6000);
+ float t = 2 * 3.1415f * cnt / (AUDIO_SAMPLE_RATE / 1000);
+ *p_buff++ = (uint16_t) ((int16_t) (sinf(t) * 750) + 6000);
}
- while (1)
- {
- tud_task(); // tinyusb device task
+ while (1) {
+ tud_task();// tinyusb device task
led_blinking_task();
audio_task();
}
@@ -130,29 +126,25 @@ int main(void)
//--------------------------------------------------------------------+
// Invoked when device is mounted
-void tud_mount_cb(void)
-{
+void tud_mount_cb(void) {
blink_interval_ms = BLINK_MOUNTED;
}
// Invoked when device is unmounted
-void tud_umount_cb(void)
-{
+void tud_umount_cb(void) {
blink_interval_ms = BLINK_NOT_MOUNTED;
}
// Invoked when usb bus is suspended
// remote_wakeup_en : if host allow us to perform remote wakeup
// Within 7ms, device must draw an average of current less than 2.5 mA from bus
-void tud_suspend_cb(bool remote_wakeup_en)
-{
+void tud_suspend_cb(bool remote_wakeup_en) {
(void) remote_wakeup_en;
blink_interval_ms = BLINK_SUSPENDED;
}
// Invoked when usb bus is resumed
-void tud_resume_cb(void)
-{
+void tud_resume_cb(void) {
blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
}
@@ -160,15 +152,15 @@ void tud_resume_cb(void)
// AUDIO Task
//--------------------------------------------------------------------+
-void audio_task(void)
-{
- // Yet to be filled - e.g. read audio from I2S buffer.
- // Here we simulate a I2S receive callback every 1ms.
+// This task simulates an audio receive callback, one frame is received every 1ms.
+// We assume that the audio data is read from an I2S buffer.
+// In a real application, this would be replaced with actual I2S receive callback.
+void audio_task(void) {
static uint32_t start_ms = 0;
uint32_t curr_ms = board_millis();
- if ( start_ms == curr_ms ) return; // not enough time
+ if (start_ms == curr_ms) return;// not enough time
start_ms = curr_ms;
- tud_audio_write(i2s_dummy_buffer, AUDIO_SAMPLE_RATE/1000 * CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX * CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX);
+ tud_audio_write(i2s_dummy_buffer, AUDIO_SAMPLE_RATE / 1000 * CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX * CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX);
}
//--------------------------------------------------------------------+
@@ -176,8 +168,7 @@ void audio_task(void)
//--------------------------------------------------------------------+
// Invoked when audio class specific set request received for an EP
-bool tud_audio_set_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
-{
+bool tud_audio_set_req_ep_cb(uint8_t rhport, tusb_control_request_t const *p_request, uint8_t *pBuff) {
(void) rhport;
(void) pBuff;
@@ -189,14 +180,15 @@ bool tud_audio_set_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_re
uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
uint8_t ep = TU_U16_LOW(p_request->wIndex);
- (void) channelNum; (void) ctrlSel; (void) ep;
+ (void) channelNum;
+ (void) ctrlSel;
+ (void) ep;
- return false; // Yet not implemented
+ return false;// Yet not implemented
}
// Invoked when audio class specific set request received for an interface
-bool tud_audio_set_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
-{
+bool tud_audio_set_req_itf_cb(uint8_t rhport, tusb_control_request_t const *p_request, uint8_t *pBuff) {
(void) rhport;
(void) pBuff;
@@ -208,14 +200,15 @@ bool tud_audio_set_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_r
uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
uint8_t itf = TU_U16_LOW(p_request->wIndex);
- (void) channelNum; (void) ctrlSel; (void) itf;
+ (void) channelNum;
+ (void) ctrlSel;
+ (void) itf;
- return false; // Yet not implemented
+ return false;// Yet not implemented
}
// Invoked when audio class specific set request received for an entity
-bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
-{
+bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const *p_request, uint8_t *pBuff) {
(void) rhport;
// Page 91 in UAC2 specification
@@ -230,40 +223,37 @@ bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
// If request is for our feature unit
- if ( entityID == 2 )
- {
- switch ( ctrlSel )
- {
+ if (entityID == 2) {
+ switch (ctrlSel) {
case AUDIO_FU_CTRL_MUTE:
// Request uses format layout 1
TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_1_t));
- mute[channelNum] = ((audio_control_cur_1_t*) pBuff)->bCur;
+ mute[channelNum] = ((audio_control_cur_1_t *) pBuff)->bCur;
TU_LOG2(" Set Mute: %d of channel: %u\r\n", mute[channelNum], channelNum);
- return true;
+ return true;
case AUDIO_FU_CTRL_VOLUME:
// Request uses format layout 2
TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_2_t));
- volume[channelNum] = (uint16_t) ((audio_control_cur_2_t*) pBuff)->bCur;
+ volume[channelNum] = (uint16_t) ((audio_control_cur_2_t *) pBuff)->bCur;
TU_LOG2(" Set Volume: %d dB of channel: %u\r\n", volume[channelNum], channelNum);
- return true;
+ return true;
// Unknown/Unsupported control
default:
TU_BREAKPOINT();
- return false;
+ return false;
}
}
- return false; // Yet not implemented
+ return false;// Yet not implemented
}
// Invoked when audio class specific get request received for an EP
-bool tud_audio_get_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request)
-{
+bool tud_audio_get_req_ep_cb(uint8_t rhport, tusb_control_request_t const *p_request) {
(void) rhport;
// Page 91 in UAC2 specification
@@ -271,16 +261,17 @@ bool tud_audio_get_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_re
uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
uint8_t ep = TU_U16_LOW(p_request->wIndex);
- (void) channelNum; (void) ctrlSel; (void) ep;
+ (void) channelNum;
+ (void) ctrlSel;
+ (void) ep;
// return tud_control_xfer(rhport, p_request, &tmp, 1);
- return false; // Yet not implemented
+ return false;// Yet not implemented
}
// Invoked when audio class specific get request received for an interface
-bool tud_audio_get_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request)
-{
+bool tud_audio_get_req_itf_cb(uint8_t rhport, tusb_control_request_t const *p_request) {
(void) rhport;
// Page 91 in UAC2 specification
@@ -288,14 +279,15 @@ bool tud_audio_get_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_r
uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
uint8_t itf = TU_U16_LOW(p_request->wIndex);
- (void) channelNum; (void) ctrlSel; (void) itf;
+ (void) channelNum;
+ (void) ctrlSel;
+ (void) itf;
- return false; // Yet not implemented
+ return false;// Yet not implemented
}
// Invoked when audio class specific get request received for an entity
-bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request)
-{
+bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *p_request) {
(void) rhport;
// Page 91 in UAC2 specification
@@ -305,12 +297,9 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
// Input terminal (Microphone input)
- if (entityID == 1)
- {
- switch ( ctrlSel )
- {
- case AUDIO_TE_CTRL_CONNECTOR:
- {
+ if (entityID == 1) {
+ switch (ctrlSel) {
+ case AUDIO_TE_CTRL_CONNECTOR: {
// The terminal connector control only has a get request with only the CUR attribute.
audio_desc_channel_cluster_t ret;
@@ -321,9 +310,8 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
TU_LOG2(" Get terminal connector\r\n");
- return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
- }
- break;
+ return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void *) &ret, sizeof(ret));
+ } break;
// Unknown/Unsupported control selector
default:
@@ -333,10 +321,8 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
}
// Feature unit
- if (entityID == 2)
- {
- switch ( ctrlSel )
- {
+ if (entityID == 2) {
+ switch (ctrlSel) {
case AUDIO_FU_CTRL_MUTE:
// Audio control mute cur parameter block consists of only one byte - we thus can send it right away
// There does not exist a range parameter block for mute
@@ -344,8 +330,7 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
return tud_control_xfer(rhport, p_request, &mute[channelNum], 1);
case AUDIO_FU_CTRL_VOLUME:
- switch ( p_request->bRequest )
- {
+ switch (p_request->bRequest) {
case AUDIO_CS_REQ_CUR:
TU_LOG2(" Get Volume of channel: %u\r\n", channelNum);
return tud_control_xfer(rhport, p_request, &volume[channelNum], sizeof(volume[channelNum]));
@@ -355,21 +340,21 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
// Copy values - only for testing - better is version below
audio_control_range_2_n_t(1)
- ret;
+ ret;
ret.wNumSubRanges = 1;
- ret.subrange[0].bMin = -90; // -90 dB
- ret.subrange[0].bMax = 90; // +90 dB
- ret.subrange[0].bRes = 1; // 1 dB steps
+ ret.subrange[0].bMin = -90;// -90 dB
+ ret.subrange[0].bMax = 90; // +90 dB
+ ret.subrange[0].bRes = 1; // 1 dB steps
- return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
+ return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void *) &ret, sizeof(ret));
// Unknown/Unsupported control
default:
TU_BREAKPOINT();
return false;
}
- break;
+ break;
// Unknown/Unsupported control
default:
@@ -379,14 +364,11 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
}
// Clock Source unit
- if ( entityID == 4 )
- {
- switch ( ctrlSel )
- {
+ if (entityID == 4) {
+ switch (ctrlSel) {
case AUDIO_CS_CTRL_SAM_FREQ:
// channelNum is always zero in this case
- switch ( p_request->bRequest )
- {
+ switch (p_request->bRequest) {
case AUDIO_CS_REQ_CUR:
TU_LOG2(" Get Sample Freq.\r\n");
// Buffered control transfer is needed for IN flow control to work
@@ -396,12 +378,12 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
TU_LOG2(" Get Sample Freq. range\r\n");
return tud_control_xfer(rhport, p_request, &sampleFreqRng, sizeof(sampleFreqRng));
- // Unknown/Unsupported control
+ // Unknown/Unsupported control
default:
TU_BREAKPOINT();
return false;
}
- break;
+ break;
case AUDIO_CS_CTRL_CLK_VALID:
// Only cur attribute exists for this request
@@ -416,59 +398,20 @@ bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
}
TU_LOG2(" Unsupported entity: %d\r\n", entityID);
- return false; // Yet not implemented
-}
-
-bool tud_audio_tx_done_pre_load_cb(uint8_t rhport, uint8_t itf, uint8_t ep_in, uint8_t cur_alt_setting)
-{
- (void) rhport;
- (void) itf;
- (void) ep_in;
- (void) cur_alt_setting;
-
-
- // In read world application data flow is driven by I2S clock,
- // both tud_audio_tx_done_pre_load_cb() & tud_audio_tx_done_post_load_cb() are hardly used.
- // For example in your I2S receive callback:
- // void I2S_Rx_Callback(int channel, const void* data, uint16_t samples)
- // {
- // tud_audio_write_support_ff(channel, data, samples * N_BYTES_PER_SAMPLE * N_CHANNEL_PER_FIFO);
- // }
-
- return true;
-}
-
-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)
-{
- (void) rhport;
- (void) n_bytes_copied;
- (void) itf;
- (void) ep_in;
- (void) cur_alt_setting;
-
- return true;
-}
-
-bool tud_audio_set_itf_close_EP_cb(uint8_t rhport, tusb_control_request_t const * p_request)
-{
- (void) rhport;
- (void) p_request;
-
- return true;
+ return false;// Yet not implemented
}
//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
-void led_blinking_task(void)
-{
+void led_blinking_task(void) {
static uint32_t start_ms = 0;
static bool led_state = false;
// Blink every interval ms
- if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
+ if (board_millis() - start_ms < blink_interval_ms) return;// not enough time
start_ms += blink_interval_ms;
board_led_write(led_state);
- led_state = 1 - led_state; // toggle
+ led_state = 1 - led_state;// toggle
}
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