Android FM single sound and stereo switching sample code _android

The current design is to support the single voice and stereo automatic switching. Switching is required to meet under certain conditions before switching, switching conditions and radio signal strength RSSI, signal stability cqi and so on are related.
At present, there are two interfaces left on the upper level, namely Stereomono and Setstereomono.

Stereomono
Query whether the current radio is in stereo or monomer sound playback.

Setstereomono
Set the current radio to play in stereo or monomer sound.

A point to note:
1. When set to the monomer sound, will certainly switch to the monomer sound, and always keep the monomer sound, will not change with the radio environment changes, unless the upper layer is reset to stereo playback.
2. When set to stereo, the radio automatically determines, based on the current station's environment, the switch to that station, which is related to the environment.

For 6628 if you want to change its toggle Rssi threshold (6620 cannot be changed):
Calculation formula:
Stereo to Mono switch threshold adjustment:

Variable name: blendctrlrssi_th
address:0x314f in coefficient memory.
Th maximum Value: 1024
Th minimum Value: 0
Th default value: 356
Conversion formula: Threshold =-((RSSI (dBm)) *4*16/6 + 384)
The default value for the computed Rssi is -69.375DBM

To modify the code:
MT6628_FM_LIB.C Mt6628_setfreq finally add code
Delayms (10);
Mt6628_write (0xe2, 0x314f);
Mt6628_write (0xe3, TH); Th setting-75dbm (th = 0x01a0)
Mt6628_write (0xe1, 0x0002);