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Change the video image to scrolling color bars.
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@ -31,7 +31,6 @@
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#include "tusb.h"
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#include "usb_descriptors.h"
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#include "images.h"
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//--------------------------------------------------------------------+
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// MACRO CONSTANT TYPEDEF PROTYPES
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//--------------------------------------------------------------------+
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@ -104,15 +103,54 @@ void tud_resume_cb(void)
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//--------------------------------------------------------------------+
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// USB Video
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//--------------------------------------------------------------------+
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static unsigned char const *frames[] = {
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white_128x96_yuv, white_128x96_yuv, white_128x96_yuv,
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t_128x96_yuv, ti_128x96_yuv, tin_128x96_yuv, logo_128x96_yuv,
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logo_128x96_yuv, logo_128x96_yuv, logo_128x96_yuv, logo_128x96_yuv
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};
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static unsigned current_frame = 0;
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static unsigned frame_num = 0;
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static unsigned tx_busy = 0;
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static unsigned interval_ms = 1000 / FRAME_RATE;
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/* YUY2 frame buffer */
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#ifdef CFG_EXAMPLE_VIDEO_READONLY
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#include "images.h"
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#else
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static uint8_t frame_buffer[FRAME_WIDTH * FRAME_HEIGHT * 16 / 8];
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static void fill_color_bar(uint8_t *buffer, unsigned start_position)
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{
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/* EBU color bars
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* See also https://stackoverflow.com/questions/6939422 */
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static uint8_t const bar_color[8][4] = {
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/* Y, U, Y, V */
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{ 235, 128, 235, 128}, /* 100% White */
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{ 219, 16, 219, 138}, /* Yellow */
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{ 188, 154, 188, 16}, /* Cyan */
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{ 173, 42, 173, 26}, /* Green */
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{ 78, 214, 78, 230}, /* Magenta */
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{ 63, 102, 63, 240}, /* Red */
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{ 32, 240, 32, 118}, /* Blue */
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{ 16, 128, 16, 128}, /* Black */
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};
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uint8_t *p;
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/* Generate the 1st line */
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uint8_t *end = &buffer[FRAME_WIDTH * 2];
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unsigned idx = (FRAME_WIDTH / 2 - 1) - (start_position % (FRAME_WIDTH / 2));
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p = &buffer[idx * 4];
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for (unsigned i = 0; i < 8; ++i) {
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for (int j = 0; j < FRAME_WIDTH / (2 * 8); ++j) {
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memcpy(p, &bar_color[i], 4);
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p += 4;
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if (end <= p) {
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p = buffer;
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}
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}
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}
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/* Duplicate the 1st line to the others */
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p = &buffer[FRAME_WIDTH * 2];
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for (unsigned i = 1; i < FRAME_HEIGHT; ++i) {
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memcpy(p, buffer, FRAME_WIDTH * 2);
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p += FRAME_WIDTH * 2;
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}
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}
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#endif
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void video_task(void)
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{
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static unsigned start_ms = 0;
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@ -120,14 +158,20 @@ void video_task(void)
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if (!tud_video_n_streaming(0, 0)) {
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already_sent = 0;
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current_frame = 0;
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frame_num = 0;
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return;
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}
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if (!already_sent) {
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already_sent = 1;
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start_ms = board_millis();
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tud_video_n_frame_xfer(0, 0, (void*)frames[current_frame], FRAME_WIDTH * FRAME_HEIGHT * 12/8);
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#ifdef CFG_EXAMPLE_VIDEO_READONLY
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tud_video_n_frame_xfer(0, 0, (void*)&frame_buffer[(frame_num % (FRAME_WIDTH / 2)) * 4],
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FRAME_WIDTH * FRAME_HEIGHT * 16/8);
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#else
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fill_color_bar(frame_buffer, frame_num);
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tud_video_n_frame_xfer(0, 0, (void*)frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16/8);
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#endif
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}
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unsigned cur = board_millis();
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@ -135,7 +179,13 @@ void video_task(void)
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if (tx_busy) return;
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start_ms += interval_ms;
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tud_video_n_frame_xfer(0, 0, (void*)frames[current_frame], FRAME_WIDTH * FRAME_HEIGHT * 12/8);
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#ifdef CFG_EXAMPLE_VIDEO_READONLY
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tud_video_n_frame_xfer(0, 0, (void*)&frame_buffer[(frame_num % (FRAME_WIDTH / 2)) * 4],
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FRAME_WIDTH * FRAME_HEIGHT * 16/8);
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#else
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fill_color_bar(frame_buffer, frame_num);
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tud_video_n_frame_xfer(0, 0, (void*)frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16/8);
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#endif
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}
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void tud_video_frame_xfer_complete_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx)
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@ -143,9 +193,7 @@ void tud_video_frame_xfer_complete_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx
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(void)ctl_idx; (void)stm_idx;
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tx_busy = 0;
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/* flip buffer */
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++current_frame;
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if (current_frame == sizeof(frames)/sizeof(frames[0]))
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current_frame = 0;
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++frame_num;
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}
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int tud_video_commit_cb(uint_fast8_t ctl_idx, uint_fast8_t stm_idx,
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@ -61,7 +61,7 @@ enum {
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+ 7/* Endpoint */\
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)
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/* Windows support YUV2 and NV12
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/* Windows support YUY2 and NV12
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* https://docs.microsoft.com/en-us/windows-hardware/drivers/stream/usb-video-class-driver-overview */
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#define TUD_VIDEO_DESC_CS_VS_FMT_YUY2(_fmtidx, _numfmtdesc, _frmidx, _asrx, _asry, _interlace, _cp) \
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@ -97,12 +97,12 @@ enum {
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/*bStillCaptureMethod*/0, /*bTriggerSupport*/0, /*bTriggerUsage*/0, \
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/*bmaControls(1)*/0), \
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/* Video stream format */ \
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TUD_VIDEO_DESC_CS_VS_FMT_NV12(/*bFormatIndex*/1, /*bNumFrameDescriptors*/1,\
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TUD_VIDEO_DESC_CS_VS_FMT_YUY2(/*bFormatIndex*/1, /*bNumFrameDescriptors*/1, \
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/*bDefaultFrameIndex*/1, 0, 0, 0, /*bCopyProtect*/0), \
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/* Video stream frame format */ \
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TUD_VIDEO_DESC_CS_VS_FRM_UNCOMPR_CONT(/*bFrameIndex */1, 0, _width, _height, \
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_width * _height * 12, _width * _height * 12 * _fps, \
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_width * _height * 12, \
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_width * _height * 16, _width * _height * 16 * _fps, \
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_width * _height * 16, \
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(10000000/_fps), (10000000/_fps), 10000000, 100000), \
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TUD_VIDEO_DESC_CS_VS_COLOR_MATCHING(VIDEO_COLOR_PRIMARIES_BT709, VIDEO_COLOR_XFER_CH_BT709, VIDEO_COLOR_COEF_SMPTE170M), \
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/* VS alt 1 */\
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@ -6,7 +6,8 @@ CFLAGS += \
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-mabi=aapcs \
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-mcpu=cortex-m0plus \
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-DCPU_MKL25Z128VLK4 \
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-DCFG_TUSB_MCU=OPT_MCU_MKL25ZXX
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-DCFG_TUSB_MCU=OPT_MCU_MKL25ZXX \
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-DCFG_EXAMPLE_VIDEO_READONLY
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LDFLAGS += \
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-Wl,--defsym,__stack_size__=0x400 \
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