TEF6686

it use info from https://github.com/makserge/tef6686_radio and https://github.com/stailus/tef6686_rds

my articles:

• https://nicuflorica.blogspot.com/2020/02/radio-cu-tef6686.html

• https://nicuflorica.blogspot.com/2020/03/radio-cu-tef6686-si-stm32f103.html

• https://nicuflorica.blogspot.com/2020/03/radio-am-fm-rds-cu-tef6686-si-stm32f103.html

• https://nicuflorica.blogspot.com/2020/07/radio-fm-rds-cu-tef6686-si-arduino-nano.html

another article (for STM32F103): https://nicuflorica.blogspot.com/2020/03/radio-cu-tef6686-si-stm32f103.html