NRF52 config SPIS by register can't work

Question

i want config spis by register, but it can't work, when spi master send data, spis irq handler can,t enter, could you tell me what's wong happen?if i use spis library ,it works successful.

this is my code:

void nrfx_spis_1_irq_handler(void)
{

if (NRF_SPIS1->EVENTS_ENDRX)

    {
         NRF_SPIS1->EVENTS_ENDRX = 0;
         NRF_LOG_INFO("123123");
    }
}

void spis_init(void)
{
NRF_SPIS1->CONFIG = NRF_SPIS_BIT_ORDER_MSB_FIRST << 0 | 0 << 1 | 0 << 2;

    NRF_SPIS1->PSEL.CSN = 0x0 << 31 | AP_SPIS_CS_PIN << 0;
    NRF_SPIS1->PSEL.SCK = 0x0 << 31 | AP_SPIS_SCK_PIN << 0;
    NRF_SPIS1->PSEL.MOSI = 0x0 << 31 | AP_SPIS_MOSI_PIN << 0;
    NRF_SPIS1->PSEL.MISO = 0x0 << 31 | AP_SPIS_MISO_PIN << 0;

    nrf_gpio_cfg(AP_SPIS_CS_PIN,
                 NRF_GPIO_PIN_DIR_INPUT,
                 NRF_GPIO_PIN_INPUT_CONNECT,
                 NRF_GPIO_PIN_NOPULL,
                 NRF_GPIO_PIN_S0S1,
                 NRF_GPIO_PIN_NOSENSE);

    nrf_gpio_cfg(AP_SPIS_SCK_PIN,
                 NRF_GPIO_PIN_DIR_INPUT,
                 NRF_GPIO_PIN_INPUT_CONNECT,
                 NRF_GPIO_PIN_NOPULL,
                 NRF_GPIO_PIN_S0S1,
                 NRF_GPIO_PIN_NOSENSE);

    nrf_gpio_cfg(AP_SPIS_MOSI_PIN,
                     NRF_GPIO_PIN_DIR_INPUT,
                     NRF_GPIO_PIN_INPUT_CONNECT,
                     NRF_GPIO_PIN_NOPULL,
                     NRF_GPIO_PIN_S0S1,
                     NRF_GPIO_PIN_NOSENSE);

    nrf_gpio_cfg(AP_SPIS_MISO_PIN,
                     NRF_GPIO_PIN_DIR_INPUT,
                     NRF_GPIO_PIN_INPUT_CONNECT,
                     NRF_GPIO_PIN_NOPULL,
                     NRF_GPIO_PIN_H0H1,
                     NRF_GPIO_PIN_NOSENSE);

    NRF_SPIS1->DEF = 0x00;
    NRF_SPIS1->ORC = 0x00;

    NRF_SPIS1->EVENTS_ACQUIRED = 0;
    NRF_SPIS1->EVENTS_END = 0;
    NRF_SPIS1->EVENTS_ENDRX = 0;

    NRF_SPIS1->TXD.MAXCNT = AP_SPIS_MAX_DATA_LENGTH;
    NRF_SPIS1->TXD.PTR = (uint32_t)m_spis_tx_buf;

    NRF_SPIS1->RXD.MAXCNT = AP_SPIS_MAX_DATA_LENGTH;
    NRF_SPIS1->RXD.PTR = (uint32_t)m_spis_rx_buf;

    NRF_SPIS1->INTENSET |= 0x1 << 4 | 0x1 << 1 | 1 << 10;

    NVIC_SetPriority(SPI1_TWI1_IRQn, 1);
    NVIC_EnableIRQ(SPI1_TWI1_IRQn);

    NRF_SPIS1->ENABLE = 0x02;

}

Jørgen Holmefjord · Accepted Answer

Hi, 
 Liny said: 1.Why not trigger interrupt function when semaphore is allocated to cpu？ 
 As mentioned in the SPIS documentation: 
 "The SPI slave will try to acquire the semaphore when CSN goes low. If the SPI slave does not manage to acquire the semaphore at this point, the transaction will be ignored . This means that all incoming data on MOSI will be discarded, and the DEF (default) character will be clocked out on the MISO line throughout the whole transaction. This will also be the case even if the semaphore is released by the CPU during the transaction. 
 Liny said: 2. When SPIS transmission starts, the CPU attempts to acquire the semaphore at this time. Will it cause SPIS transmission failure without interruption？ 
 From documentation: "In case of a race condition where the CPU and the SPI slave try to acquire the semaphore at the same time, as illustrated in lifeline item 2 in Figure 2 , the semaphore will be granted to the CPU." and "If the CPU tries to acquire the semaphore while it is assigned to the SPI slave, an immediate handover will not be granted. However, the semaphore will be handed over to the CPU as soon as the SPI slave has released the semaphore after the granted transaction is completed." 
 Liny said: 3. I have two threads. One thread produces data and the other is SPIS sends data. The thread of production data and the thread of sending data have their own ticks, so they cannot be aligned. 
 Do you need to always have the data in the same buffer? Another approach would be to have two buffers, one assigned to the SPIS, and another buffer being filled by the "data producers", then switch buffer when the data is being sent. Switching the buffer pointer should be much faster than filling the old buffer with the new data. 
 Best regards, Jørgen

NRF52 config SPIS by register can't work

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