TMS570LC4357: How to use DMA for I2C transmit and receive?

Using DMA for I2C data transfers is similar to using DMA for SPI or SCI transfers. 

A transmit event is generated after a START condition in master transmitter mode. The DMA receives data and transmits data based on receive event and transmit event. The read and write events have the same timing as I2CRRDY (I2CRINT) and I2CXRDY (I2CXINT), respectively.

I don't have example for I2C with DMA.

uint8 TX_PACK[bsize]={'H','E','R','C','U','L','E','S','M','I','C','R','O','-','T','I'};
uint8 RX_PACK[bsize]={0};

#define I2C1_TX_ADDR ((uint32_t)(&(i2cREG1->DXR)))
#define I2C1_RX_ADDR ((uint32_t)(&(i2cREG1->DRR)))
// enable CPU response to interrupt request
_enable_IRQ();
/* i2c initialization */
i2cInit();

/* Configure address of Slave to talk to */
i2cSetSlaveAdd(i2cREG1, slv_add);
i2cSetDirection(i2cREG1, I2C_TRANSMITTER);

/* set i2c own address */
i2cSetOwnAdd(i2cREG1,own_add);

/* enable internal loopback */
i2cEnableLoopback(i2cREG1);

dmaReqAssign(DMA_CH0, DMA_REQ10);
dmaReqAssign(DMA_CH1, DMA_REQ11);

dmaSetChEnable(DMA_CH0, DMA_HW);
dmaSetChEnable(DMA_CH1, DMA_HW);

dmaEnableInterrupt(DMA_CH0, BTC, DMA_INTA);
dmaEnableInterrupt(DMA_CH1, BTC, DMA_INTA);

vDmaConfigCtrlTxPacket((uint32_t)(&TX_PACK[0]), I2C1_TX_ADDR, 16);
vDmaConfigCtrlRxPacket(I2C1_RX_ADDR, (uint32_t)(&RX_PACK[0]), 16);
/* - setting dma control packets for transmit */
dmaSetCtrlPacket(DMA_CH0, g_dmaCTRLPKT1);
dmaSetCtrlPacket(DMA_CH1, g_dmaCTRLPKT);

dmaEnable();

i2cREG1->DMACR |= 0x3;

i2cSetStop(i2cREG1);

/* transmit Start Condition */
i2cSetStart(i2cREG1);

1. I see both DMA interrupt notifications but RX_PACK DMA is all 0

This works, Thank you. Can you please explain why 3?