ESP8266 Community Forum

- Fri Jun 19, 2015 9:00 pm #20997

Sprite_tm any progress for 512kb flash?

https://github.com/pvvx/mp3_decode
Support all ESP2866 modules (512 Kbytes flash)
Free Flash (512 Kbytes): 200 Kbytes. Free Heap: 20 Kbytes.
MP3-decodec-out uses IRAM Buffer > 20 Kbytes (IRAM: 48k + 16k cache Flash):

Wow, respect! If you don't mind, I'm gonna see how much of your modifications I can pull into the official repo. Having a 20KB playback buffer may be enough not to need the external 128K spi buffer in most cases.

- Fri Jun 19, 2015 10:26 pm #21000

Having a 20KB playback buffer may be enough not to need the external 128K spi buffer in most cases.

https://www.youtube.com/watch?v=XIneZEfahmQ
Sound is recorded out of ESP-01 module as shown in the photo, a resistor and capacitor from the port GPIO3 (RXD) to sound in a computer.
channel: http://icecast.omroep.nl/3fm-sb-mp3

Code: Select allURL: icecast.omroep.nl/3fm-sb-mp3
connected with mns.ru-6446, channel 1
dhcp client start...
ip:192.168.1.15,mask:255.255.255.0,gw:192.168.1.1
Connecting to server 145.58.52.147...
Reading into SPI RAM FIFO...
MAD: Decoder start.
dec err 0x0101 (lost synchronization)
dec err 0x0104 (reserved sample frequency value)
dec err 0x0235 (bad main_data_begin pointer)
Rate 48000
Buffer fill 21867, DMA underrun ct 16, buff underrun ct 0
Buffer fill 21835, DMA underrun ct 43, buff underrun ct 0
Buffer fill 21875, DMA underrun ct 84, buff underrun ct 0
...

Uses patch/hack lib48main.a + lib48pp.a (increase IRAM + 16k, 'cache-flash' size = 16k).
Warning: modules ESP-01 - GPIO15 cannot be output! Change i2s_freertos.c: https://github.com/pvvx/mp3_decode/blob ... tos.c#L179

- Sat Jun 20, 2015 6:17 am #21016 I'm impressed, the sound quality is actually very acceptable!

At what frequency does the pwm run then?

- Sat Jun 20, 2015 7:14 am #21018

Doesn't work on my ESP-12, any ideas ?

Nevermind, had output on GPIO2 instead of GPIO3...