RM48L952: Sci transmission with DMA

Hi!

I'm planning to use dma at spi, sci, scilin to save cpu resources. As a starting point, I'm currently working with sci transmission via dma.

The structure of dma block is 1 frame wih 8 elements so dma is supposed to send 8 bytes in sci. Source is uint8_t array wih 16 elements('0' to 'f').

Dma is supposed to send '01234567'.

#include "sys_common.h"

/* USER CODE BEGIN (1) */
#include "sys_dma.h"
#include "sci.h"
/* USER CODE END */

/** @fn void main(void)
*   @brief Application main function
*   @note This function is empty by default.
*
*   This function is called after startup.
*   The user can use this function to implement the application.
*/

/* USER CODE BEGIN (2) */
void setDmaPacket(g_dmaCTRL *packet);
void setDmaSciReceive(g_dmaCTRL *packet);
void setDmaSciTransmit(g_dmaCTRL *packet);

uint8_t p[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
/* USER CODE END */

int main(void)
{
/* USER CODE BEGIN (3) */
    g_dmaCTRL dmaPacket = {0};
    uint32_t dmaReqlineSciRx = 30;
    uint32_t dmaReqlineSciTx = 31;

    _enable_interrupt_();
    sciInit();
    sciSend(sciREG, 6, "init\r\n");

    setDmaPacket(&dmaPacket);
    setDmaSciTransmit(&dmaPacket);
    dmaEnable();
    dmaReqAssign(DMA_CH0, dmaReqlineSciTx);
    dmaSetCtrlPacket(DMA_CH0, dmaPacket);
    dmaSetChEnable(DMA_CH0, DMA_HW);
    dmaEnableInterrupt(DMA_CH0, HBC);
    dmaEnableInterrupt(DMA_CH0, BTC);
    sciREG->SETINT |= (1 << 16);

    while(1)
    {
    }
/* USER CODE END */
}


/* USER CODE BEGIN (4) */
void setDmaSciTransmit(g_dmaCTRL *packet)
{
    packet->SADD = (uint32_t)p;
    packet->DADD = (uint32_t)(&(sciREG->TD));
}

void setDmaSciReceive(g_dmaCTRL *packet)
{
    packet->SADD = (uint32_t)(&(sciREG->RD));
    packet->DADD = (uint32_t)p;
}

void setDmaPacket(g_dmaCTRL *packet)
{
    packet->CHCTRL = 0;
    packet->ELCNT = 8;
    packet->ELDOFFSET = 0;
    packet->ELSOFFSET = 1;
    packet->FRDOFFSET = 0;
    packet->FRSOFFSET = 0;
    packet->FRCNT = 1;
    packet->PORTASGN = 4;
    packet->RDSIZE = ACCESS_8_BIT;
    packet->WRSIZE = ACCESS_8_BIT;
    packet->TTYPE = BLOCK_TRANSFER;
    packet->ADDMODERD = ADDR_INC1;
    packet->ADDMODEWR = ADDR_FIXED;
    packet->AUTOINIT = AUTOINIT_OFF;
}

void dmaGroupANotification(dmaInterrupt_t inttype, uint32 channel)
{
/*  enter user code between the USER CODE BEGIN and USER CODE END. */
/* USER CODE BEGIN (54) */
    switch(inttype)
    {
    case HBC:
        sciSend(sciREG, 12, "half block\r\n");
        break;
    case BTC:
        sciSend(sciREG, 12, "block done\r\n");
        break;
    }


Expected result in terminal is:

init
0123half block
4567block done
Place of 0~7 can vary.

Actual result is:

init
7half block
block done
Only last element 7 is sent through sci. When I changed 8th element 7 into different value the result changed accordingly, so dma is reading something but not correctly.

What could be the problem?