Difference between revisions of "Imxssi"

Revision as of 10:29, 4 January 2010

SSI test tool

Use a special release of tsc2102 driver and imxssi for audio development purpose.

$ make menuconfig

Package Selection for the target  --->
    Armadeus specific tools/utilities  --->
        [*] imxssi

• Requirements:

TSC2102 mclk: 16MHZ
FS rate: 32KHz

• U-Boot: Enable i.MX register access from user space in U-Boot:

 BIOS> run unlock_regs

• Linux: Load tsc driver

 # modprobe tsc2102

• imxssi: generate ssi signal

Special release of imxssi can generate an audio signal.
just use imxssi with three parameters:

 # imxssi [-t type] [-l level] [-s samples] [--loop]

• type can be 0: triangular signal or 1: sinusoïdal signal
• samples: period of the signal in number of samples per channel
• level: Signal level coefficient [0.0 .. 1.0]

For example to produce a 300Hz 5v(pk-pk) sinusoid:

 # imxssi -t 1 -s 50 -l 0.15

• next step: dma transfer