实际缓冲区分配可以调用snd_pcm_lib_malloc_pages函数。在该函数被调用之后,运行时配置(snd_pcm_runtime)中的相关参数值才有效。 (3)、运行前准备,对应回调函数中的prepare,意味着该函数调用后,所有设置都已经就绪。 (4)、启动、停止,对应回调函数trigger,该函数的命令参数(cmd)表明是启动、停止、暂停
696 intsnd_pcm_new(struct snd_card *card, const char *id, int device, 697 intplayback_count, int capture_count, 698 struct snd_pcm ** rpcm) 699 { 700 structsnd_pcm *pcm; 701 int err; 702 staticstruct snd_device_ops ops = { 703 .dev_free =snd_pcm_dev_free, 704 .dev_regist...
Four I2S/PCM external interfaces (I2S0, I2S1, I2S2, and I2S3) for connecting external power amplifier and MIC ADC Compliant with standard Philips Inter-IC sound (I2S) bus specification –Left-justified, Right-justified, PCM mode, and TDM format –Programmable PCM frame width:...
trigger input I2S0 Bit clock General purpose I/O UART2 receive input UART3 receive input Timer/counter 11 IOMSTR N Chip Select 11 - - - Fast PIO Input Input - I/O Bidirectional Open Drain Output Output Output - - - - Input Input - I/O Input - Output Output - Input - - Input ...
Linux for Broadcom BCM63xx SoC. Contribute to openwrt/bcm63xx-next development by creating an account on GitHub.
? PCM audio interface 图1.ATWILC3000框图 图2.ATWILC3000应用参考电路图 二. SMART SAMA5D3 MPU The Atmel? | SMART SAMA5D3 series is a high-performance, power-efficient embedded MPU based on the ARM? Cortex?-A5 processor, achieving 536 MHz with power consumption levels below 0.5 mW in low-...
The CX20924 is the first product in this category with an integrated voice trigger function that supports a low system power Wake-on-Voice (WoV) function and 360-degree Smart Source Locator (SSL) that detects user's location around the device. The device includes a Pulse Density Modulated (...
void (*shutdown)(struct snd_pcm_substream *); int (*hw_params)(struct snd_pcm_substream *, struct snd_pcm_hw_params *); int (*hw_free)(struct snd_pcm_substream *); int (*prepare)(struct snd_pcm_substream *); int (*trigger)(struct snd_pcm_substream *, int...
SNDRV_PCM_STREAM_xxx */ int ret; snd_soc_dpcm_mutex_lock(rtd); ret = snd_soc_component_compr_trigger(cstream, cmd); if (ret < 0) goto out; ret = snd_soc_dai_compr_trigger(cpu_dai, cstream, cmd); if (ret < 0) goto out; switch (cmd) { case SNDRV_PCM_TRIGGER_START: ...
Current consumption, power down state(1) Current consumption, headphone master(2) Current consumption, headphone slave(2) Voltage regulator / crystal oscillator off – status lost (POWERED_DOWN state) Average current for a PurePath Wireless master with I2S interface active, sourcing two PCM16 ...