I2S example seems not working (GIT8266O-815)

[skyh]

Environment

• Development Kit: NodeMCU
• IDF version: af0cdc36
• Development Env: terminal + make
• Operating System: MacOS
• Power Supply: USB

Physical Setup

Problem Description

No I2S data output when running i2s example (compiled and flashed correctly)

Expected Behavior

I2S data available on pins GPIO_NUM_{4,2,15,3}

Actual Behavior

No I2S signal, only MCLK. This is how it looks in DSView (I added a delay before main loop to see when MCLK starts)

(closer look)

Steps to reproduce

1. Compile and flash I2S example from examples/peripherals/i2s
2. Connect logic analyzer to pins 4, 2, 15, 3
3. Run make monitor
4. the terminal output should be like this

Code to reproduce this issue

Use examples/peripherals/i2s

Debug Logs

I (178) esp_image: segment 1: paddr=0x00029290 vaddr=0x40229288 size=0x05dec ( 24044) map
I (186) esp_image: segment 2: paddr=0x0002f084 vaddr=0x3ffe8000 size=0x003e0 (   992) load
I (189) esp_image: segment 3: paddr=0x0002f46c vaddr=0x40100000 size=0x00080 (   128) load
I (203) esp_image: segment 4: paddr=0x0002f4f4 vaddr=0x40100080 size=0x04b88 ( 19336) load
I (222) boot: Loaded app from partition at offset 0x10000
I (252) i2s: DMA Malloc info, datalen=blocksize=1024, dma_buf_count=6
I (6323) i2s: DMA Malloc info, datalen=blocksize=2048, dma_buf_count=6
I (12354) i2s: DMA Malloc info, datalen=blocksize=1024, dma_buf_count=6
I (18385) i2s: DMA Malloc info, datalen=blocksize=2048, dma_buf_count=6
I (24415) i2s: DMA Malloc info, datalen=blocksize=1024, dma_buf_count=6
I (30447) i2s: DMA Malloc info, datalen=blocksize=2048, dma_buf_count=6
I (36476) i2s: DMA Malloc info, datalen=blocksize=1024, dma_buf_count=6
I (42508) i2s: DMA Malloc info, datalen=blocksize=2048, dma_buf_count=6

... (etc)

Other items if possible

• sdkconfig file (attach the sdkconfig file from your project folder)
• elf file in the build folder (note this may contain all the code details and symbols of your project.)
• coredump (This provides stacks of tasks.)

[morpheus017]

#1232
This pull fixes the issue