AM3358: SPIEN control in single channel mode

Tony Tang

Part Number: AM3358

In multi-channel 4pin mode, I can get timing with SPIEN automatically active/inactive between transmit.

but in SINGLE channel mode, SPIEN doesn't change automatically, always keep low.

I tried to manually control SPIEN with FORCE=1, then set EPOL/clear EPOL, the waveform as below with below code. there is delay of SPIEN, looks strange, like use GPIO to control SPIEN.

while(1)
{
f

or(i=0; i<512; i++)
{
*(unsigned int *)(OMAP3_MCSPI1_BASE + 0x138) = tx[i];
while(( *(unsigned int *)(OMAP3_MCSPI1_BASE + 0x130)&0x4)==0); //wait tx data register empty
{
*(unsigned int *)(OMAP3_MCSPI1_BASE + 0x12C) &= ~(1<<6); //SPIEN
*(unsigned int *)(OMAP3_MCSPI1_BASE + 0x12C) |= 1<<6;

}
}