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How to transmit more than 256 bytes one time by SPI DMA on CC254X?

Hansome
Intellectual 660 points
Other Parts Discussed in Thread: BLE-STACK

On CC254X, I configured the SPI DMA transmission:

halDMADesc_t* ch = HAL_DMA_GET_DESC1234(HAL_DMA_CH_TX);
HAL_DMA_ABORT_CH(HAL_DMA_CH_TX);
HAL_DMA_SET_DEST(ch, HAL_DMA_U0DBUF);
HAL_DMA_SET_VLEN(ch, HAL_DMA_VLEN_USE_LEN);
HAL_DMA_SET_WORD_SIZE(ch, HAL_DMA_WORDSIZE_BYTE);
HAL_DMA_SET_TRIG_MODE(ch, HAL_DMA_TMODE_SINGLE);
HAL_DMA_SET_TRIG_SRC(ch, HAL_DMA_TRIG_UTX0);
HAL_DMA_SET_SRC_INC(ch, HAL_DMA_SRCINC_1);
HAL_DMA_SET_SOURCE(ch, buf);
HAL_DMA_SET_DST_INC(ch, HAL_DMA_DSTINC_0);
HAL_DMA_SET_IRQ(ch, HAL_DMA_IRQMASK_ENABLE);
HAL_DMA_SET_M8(ch, HAL_DMA_M8_USE_8_BITS);
HAL_DMA_SET_PRIORITY(ch, HAL_DMA_PRI_HIGH);
HAL_DMA_SET_LEN(ch, len);
HAL_DMA_ABORT_CH(HAL_DMA_CH_TX);
HAL_DMA_ARM_CH(HAL_DMA_CH_TX);
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP"); asm("NOP");
HAL_DMA_MAN_TRIGGER(HAL_DMA_CH_TX);

It can send up to 255 bytes at a time.

Now I want to tranmit more than 256 bytes, that is len > 256, How to configure it? Thanks!

  • 0
    TI__Guru 56215 points

    Hi,

    Please take a look at TRM page 99. If Vlen is different than 000 and 111, then the max length is 0x1FFF bytes

  • 0
    TI__Guru 56590 points

    Hello Hansome,

    Take a look at the _hal_uart_spi.c file where the SPI maximum packet length is defined:

    #define SPI_MAX_PKT_LEN            256

    Could this solve your issue?

  • 0 in reply to Christin Lee
    Intellectual 660 points
    Christin,

    I had debugged carefully,
    a. VLEN = 00
    b. LEN = 0x02d0

    But the SPI only transmits the first 255 bytes, Is it the limit of SPI interface?

    Hansome
  • 0 in reply to Eirik V
    Intellectual 660 points
    Eirik,

    I am pure manual operation, No dependent firmware library.

    Hansome
  • 0 in reply to Hansome
    TI__Guru 56590 points
    Try to utilize _hal_uart_spi.c file from the ble-1.4.1 stack installer instead of using your own implementation.
  • 0 in reply to Eirik V
    Intellectual 660 points
    Eirik,

    In other words, based on CC254x BLE Stack V1.4.0, can you tell me how to:

    a. Config the SPI macros(SPI master)

    b. Initialize the SPI interface(SPI master)

    c. Transmit the SPI bytes by DMA continuously(SPI master)

    I tried to search on this forum, TI documents, TI websites, google, etc.

    There is no result about SPI interface usage on CC254x.

    That is why I used my own implementation for SPI TX DMA, Could you help me? Thanks!

    Hansome
  • 0 in reply to Hansome
    TI__Guru 56590 points
    This is implemented in hal_uart used in the HostTest Project. I would advise you to use the latest ble-stack (version 1.4.1) as a basis. The _hal_uart_spi.c provide a full API to use SPI-DMA. Try to set up a basic program then you can modify your copy of _hal_uart_spi.c as you see fit.
  • 0 in reply to Eirik V
    Intellectual 660 points
    Eirik,

    I am not a person who has no experience, the SPI is really hard to use.

    Based on SimpleBLEPeripheral,
    a. Config the project
    HAL_UART=TRUE
    HAL_UART_PORT=TRUE
    HAL_UART_SPI=1
    HAL_SPI_MASTER
    HAL_UART_DMA=1
    b. Write the testing codes
    HalUARTInit();
    halUARTCfg_t cfg;
    cfg.callBackFunc = NULL;
    HalUARTOpen(HAL_UART_PORT_1, &cfg);
    uint8 buf[16];
    uint8 i;
    for(i = 0; i < 16; i++){
    buf[i] = i;
    }
    while(1){
    HalUARTWrite(HAL_UART_PORT_1, buf, 16);
    for(i = 0; i < 64; i++){
    asm("nop");
    }
    }

    P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 don't have normal waveforms.
    Could you try it too?I really need the guidance of the details.Thank you very much!

    Hansome