Entrant 5 : USB WAV player
Posted: Sun Mar 13, 2016 12:11 amUser
voegelchen
Description
I have used the ESP8266 device (on a module) to build an USB-stick Audio Player wich is controllable via WLAN.
I used a Cortex M3 CPU to control , read USB massstorage and put out digital Audio data. The ESP8266 device is connected to one of the UARTs and I've adopted the ESP8266 AT firmware to add special portocol stuff, like packet start and end delimter. Also a ringbuffer for incoming (UDP) packets was added, so that if receiving while transmitting, no error occurs. On one GPIO Pin, a new arrived packet is signaled to the CPU and the Signal is revoed only, if all new packets were readout. Another GPIO is set to HI while ESP8266 RESET and this flag can conly be cleared by a special UART packet from the CPU, so a ESP8266 RESET could be detected.
As a special, the Android software will autodetect the device in the network, without MAC adress scanning !
If you are interested in that topic, I can send you a paper wich explain, how it's done
Parts
Links
Video
Images
voegelchen
Description
I have used the ESP8266 device (on a module) to build an USB-stick Audio Player wich is controllable via WLAN.
I used a Cortex M3 CPU to control , read USB massstorage and put out digital Audio data. The ESP8266 device is connected to one of the UARTs and I've adopted the ESP8266 AT firmware to add special portocol stuff, like packet start and end delimter. Also a ringbuffer for incoming (UDP) packets was added, so that if receiving while transmitting, no error occurs. On one GPIO Pin, a new arrived packet is signaled to the CPU and the Signal is revoed only, if all new packets were readout. Another GPIO is set to HI while ESP8266 RESET and this flag can conly be cleared by a special UART packet from the CPU, so a ESP8266 RESET could be detected.
As a special, the Android software will autodetect the device in the network, without MAC adress scanning !
If you are interested in that topic, I can send you a paper wich explain, how it's done
Parts
Links
Video
Images