Linux/AM3358: SPI control

Tool/software: Linux

Hi,

I am using BBB.

I am trying to write a value directly in the register to control mcSPI, not through the spi library.  
But no matter how I change the value, I can't send the correct CLK signal.

I wrote a program through the SPI library, it works fine, I used config-pin to change the pin-mode, so I think I should have no errors in the pinmux settings.

Here is the simple program I wrote. I used devmem2 to write value in register.

CM_PER_SPI1_CLKCTRL 0x2  //enable clk

MCSPI_SYSCONFIG 0x2  //reset spi

MCSPI_MODULCTRL 0x1 // single master 4pin mode

MCSPI_SYSCONFIG 0x309 // OCP and Functional clocks are maintained and smart-idle

MCSPI_IRQSTATUS 0xffffffff //reset interrupt

MCSPI_IRQENABLE 0x70 //enable tx1_underflow, rx1_full, tx1_empty

MCSPI_CH1CTRL 0x0 //disable channel1

MCSPI_CH1CONF 0x0x20103cc //set config of spi1

MCSPI_CH1CTRL 0x1 //enable channel1

MCSPI_TX1 0xaa //write 0xaa in tx1

MCSPI_CH1CTRL 0x0 //disable channel

Please tell me where the error is, thank you very much, I have been looking for a few weeks and no results.