TMS320F28022: I2C CLKH and CLKL, want to go real slow

I am having troubles with I2C stability, and want to slow the I2C clock to 1/10 it's normal speed so I can use my PC sound card to capture the I2C signals. The sound card is limited to 20KHz. I thought a 10KHz I2C clock might work.

See below for the numbers I used for the prescaler and clocks.

It seems to work OK (sort of) at 100KHz, (I2CCLKL and I2CCLKH both set at 45d or 0x2d.)

But when I use 450d (0x1c2) for both hi and lo clocks the communication break down

I have a FTDI FT201x USB to I2C chip, A PurePath CC8030 wireless chip, and also an Analog Devices ADAU1701 on the I2C port.

Any ideas?

Thanks, Mark.

Here is my attempt:

The Piccolo is running at 50MHz.

// setup the prescaler for the I2C module. must be between 7-12 Mhz on module clk
I2caRegs.I2CPSC.all = 4;        // 50MHz / 5 (PSC + 1) = 10.0MHz
                                // setting PSC to 4 makes d = 5

// here is the math: for 100KHz where d is 5 (based on the prescale, above)
// 10,000,000 / (45 + 5) + (45 + 5)
// 10,000,000 / 50 + 50
// 10,000,000 / 100 = 100.0 KHz
// if we want 100k clk freq, use 45 and 45 respectively
// 100KHz is 10uS pulse cycle. 9 bits per byte is 90uS per byte
    I2caRegs.I2CCLKL = 45;                // NOTE: must be non zero
    I2caRegs.I2CCLKH = 45;                // NOTE: must be non zero
// lets try to slow it down to a 10Khz rate
    I2caRegs.I2CCLKL = 450;                // NOTE: must be non zero
    I2caRegs.I2CCLKH = 450;                // NOTE: must be non zero