RM48 SPI1 DMA -> one byte lost

Hi all,

I have a strange behaviour of my MIBSPI1 with DMA (compatibily mode). Problem is that I lose last byte. It looks like that DMA BTC interrupt occurs too quickly. 

My setup on RM48L952ZWT:

I have clk of 100Mhz, prescale set 9. 

Functional pins are CLK, SOMI, SIMO.

Im SPI1 is in master mode.

First question: Do I have to send first byte manualy when im in master mode?

This is how i setup my spi to transfer dma:

/* Disable SPI DMA request */
SpiBase->DMAREQEN = 0x0u;

/* Disable SPI1 */
psSpiBase->ENA = 0x00u;

/* Disable DMA Channels based on SPI peripheral */

dmaSetChDisable(DMA_MIBSPI1_TX_CHANNEL, DMA_HW);

dmaSetChDisable(DMA_MIBSPI1_RX_CHANNEL, DMA_HW);

dmaReqAssign(DMA_MIBSPI1_RX_CHANNEL, DMA_MIBSPI1_0_REQ_LINE);
dmaReqAssign(DMA_MIBSPI1_TX_CHANNEL, DMA_MIBSPI1_1_REQ_LINE);

/* Enable interrupt for DMA channel - Block transfer complete */
dma_ntEnable(DMA_MIBSPI1_RX_CHANNEL, DMA_BTC);

/* Set configuration for DMA channel */
dmaTx.SADD = (uint32_t)&SrcBuff[1u];
dmaTx.DADD = (uint32_t)&SpiBase->DAT1.DAT1all;
dmaTx.FRCNT = Size-1u;
dmaTx.ELCNT = 1u;
dmaTx.ELDOFFSET = 0u;
dmaTx.ELSOFFSET = 0u;
dmaTx.FRDOFFSET = 0u;
dmaTx.FRSOFFSET = 0u;
dmaTx.PORT = 4u;
dmaTx.RDSIZE = DMA_ACCESS_8_BIT;
dmaTx.WRSIZE = DMA_ACCESS_8_BIT;
dmaTx.TTYPE = DMA_FRAME_TRANSFER;
dmaTx.ADDMODERD = DMA_ADDR_INC1;
dmaTx.ADDMODEWR = DMA_ADDR_FIXED;
dmaTx.AUTOINIT = DMA_AUTOINIT_OFF;

dmaRx.SADD = (uint32_t)&SpiBase->BUF;
dmaRx.DADD = (uint32_t)&DestBuff[0u];
dmaRx.FRCNT = Size;
dmaRx.ELCNT = 1u;
dmaRx.ELDOFFSET = 0u;
dmaRx.ELSOFFSET = 0u;
dmaRx.FRDOFFSET = 0u;
dmaRx.FRSOFFSET = 0u;
dmaRx.PORT = 4u;
dmaRx.RDSIZE = DMA_ACCESS_8_BIT;
dmaRx.WRSIZE = DMA_ACCESS_8_BIT;
dmaRx.TTYPE = DMA_FRAME_TRANSFER;
dmaRx.ADDMODERD = DMA_ADDR_FIXED;
dmaRx.ADDMODEWR = DMA_ADDR_INC1;
dmaRx.AUTOINIT = DMA_AUTOINIT_OFF;

/* Set configuration for DMA channel */
dmaSetCtrlPacket(DMA_MIBSPI1_TX_CHANNEL, dmaTx);
dmaSetCtrlPacket(DMA_MIBSPI1_RX_CHANNEL, dmaRx);

/* Enable MIBSPI1 */
SpiBase->ENA = 0x01;

/* manually send the first data, otherwise DMA doesn't work */
SpiBase->DAT1.DAT1all = SrcBuff[0];

/* Enable DMA channels */
dmaSetChEnable(DMA_MIBSPI1_TX_CHANNEL, DMA_HW);
dmaSetChEnable(DMA_MIBSPI1_RX_CHANNEL, DMA_HW);

/* Enable SPI DMA request */
SpiBase->DMAREQEN |= 0x1u;

Did someone had the same problems?

I must say that on slave side with this implementation works normal but i use SPI3.