Some resources to help you getting started with STM32 programming.
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FM launch instructions
<1>: Power supply
1, module with Micro USB interface, can be powered by computer USB;
2, module corresponding port (marked on PCB) -, + respectively connected to the negative and positive power supply (battery), power supply recommended battery Or other regulated power supply. Switching power supplies without filters (such as mobile phone chargers, mobile power supplies, and other switching power supplies) are not recommended. Otherwise, interference from the power supply may affect the normal operation of this module. The normal working voltage of this module is 3.0-5.0V, and the power supply voltage should not exceed this range.
FM_ANT port of the antenna is used to connect the FM antenna. In order to receive the FM signal better, it is recommended to connect the rod antenna with a length of 75cm.
<3>: Line input: The stereo sound signal can be input using the 3.5mm standard audio plug. If there is no plug insertion, the microphone signal is automatically picked up (the microphone signal is on the left channel). USB audio signal input is also available.
<4> Volume adjustment
Press VOL- or VOL+ to adjust the volume, and the LCD screen displays the volume level.
<5> Frequency adjustment
Press VOL- or VOL+ to adjust the transmission frequency, short press +-0.1MHz, long press +-1MHz, and the LCD screen displays the current frequency.
Down Press PAUSE button to switch mute/unmute
<7>: Connect the serial port (no need to connect the serial port control). The
module reserves the TTL level serial port control interface. The TTL serial port communicates with this module. The UART_RX, UART_TX and GND (labeled on the corresponding position of the PCB) of the module need to be connected. The external MCU (microcontroller) or computer serial port sends the relevant functions of the command control module.
For specific serial commands, see the document "FM Transmit AT Command Table".
There is no other information.