HI,
I have some problem to let SPI ( SSP2 ) to work in slave mode on i.MX28 board under Windows CE 6.0
I have an SPI device that send data at ~4 MHz, and I see the data and the clock on the correct Pin when the SS goes down.
I try to configure the SPI in slave mode and I try to poll the FIFO_EMPTY bit of the SSP_STATUS register and then read the actual data from the SSP_DATA register.
Unfortunately I the FIFO_EMPTY is always set, so I can't read anything...
Here are the register configuration:
SSP: SSP_CTRL0 = 0x2b000000
SSP: SSP_CTRL1 = 0x9f1
SSP: SSP_TIMING = 0xffff0800
SSP: SSP_XFER_SIZE = 0x1
the status register contains always:
SSP: SSP_STATUS = 0xe0000020
This is the portion of code that I use for the SPITransfer:
HW_SSP_CTRL0_CLR(m_Index,BM_SSP_CTRL0_SFTRST | BM_SSP_CTRL0_CLKGATE);
HW_SSP_DATA_WR (m_Index, 0xFFFFFFFF);
HW_SSP_CTRL1_SET(m_Index, BM_SSP_CTRL1_SLAVE_MODE);
HW_SSP_CTRL1_SET(m_Index, BM_SSP_CTRL1_SLAVE_OUT_DISABLE);
HW_SSP_CTRL0_SET(m_Index,BM_SSP_CTRL0_READ);
HW_SSP_CTRL0_SET(m_Index,BM_SSP_CTRL0_DATA_XFER);
HW_SSP_XFER_SIZE_WR(m_Index,1);
HW_SSP_CTRL0_SET(m_Index,BM_SSP_CTRL0_RUN);
count = 10000;
while(( ( HW_SSP_CTRL0_RD(m_Index) & BM_SSP_CTRL0_RUN) == 0 ) && count--)
continue;
if (count <= 0) {
RETAILMSG (1, (L"SPI:>> Timeout on Line \r\n"));
break;
}
count = 100000;
while (count-- && ((HW_SSP_STATUS_RD(m_Index) & BM_SSP_STATUS_FIFO_EMPTY) != 0))
continue;
if (count <= 0) {
RETAILMSG (1, (L"SPI:>> Timeout on RX FIFO \r\n"));
break;
}
tmp = (UINT16)(HW_SSP_DATA_RD(m_Index) & 0xFFFF);
Any suggestions / help ?
Thanks in advance !!!
