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  • Author Author: packetgeek
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Meanwhile...

packetgeek

Used my gift card from the holidays.  Ordered the RDA5807M chip, a breakout board for it, and a TEA5767 board.  I'll continue experimenting and writing code for the RDA5707SP while I wait the 2-6 weeks for delivery.  Once they come in, I'll have all three of the I2C-controlled FM tuner chip sets (RDA5807x, TEA576x, and SI470x).  Will eventually need to do a comparison of how well they work with the RPi, I guess.  Also ordered a few other fun things to play with (more on those later).

 

Meanwhile...  I'll be annoying the post lady and the UPS guy when I see them (back in Bart-Simpson-Lady-where's-my-spy-camera mode).

  • Received a 3-line display on Saturday.  Need to dig through the junk box for a 1K potentiometer to control brightness.  Alternatives: try various fixed resisters or drive all the way out to Radio Shack for a single part.  Meh.

     

    Played a bit with the existing code for the TEA5767 mode on the RDA5807SP.  Cleaned up status.c so frequency looks like "98.7 MHz" instead of "98.7000" and added stereo detection (new code can test for specific flags being on).

     

    In reading the docs, it looks like the RDA5807 specs involve 6 registers, instead of the 5 employed in TEA5767 mode.  Still not sure what the difference between addresses 0x10 and 0x11 are.  One is said to be serial access and the other random access.  Not sure what that means.  I might guess that I need to read/write 6 bytes to/from 0x10, while using 0x11 would allow me to read/write single bytes at a time.  Will continue to research while I can (two classes in progress at the moment, one ends in 2.5 weeks).

     

    Once the one class is over, I'll start writing a tutorial for the TEA5767 mode.  I still think that this is a perfect beginner's project for the Raspberry Pi and programming in C (you probably learn more about searching Google and deciphering chip documentation though).