Cortex-M/NUVOTON2014. 7. 9. 12:52

M052LBN EVM - SPI 테스트

M052LBN EVM - SPI 테스트




M052LBN는 저렴한 MCU임에도 2채널의 SPI를 제공한다. FIFO있고 SPI속도도 빠르다.




M052LBN SPI 블록도



M052LBN SPI 초기화 함수

void SPI0_Init(void)

{

SYS_UnlockReg();    

     CLK_EnableModuleClock(SPI0_MODULE);

         

    /* Set multi function pin for SPI1 */

    //SYS->P0_MFP = SYS_MFP_P04_SPISS1 | SYS_MFP_P05_MOSI_1 | SYS_MFP_P06_MISO_1 | SYS_MFP_P07_SPICLK1;

     SYS->P1_MFP = SYS_MFP_P15_MOSI_0 | SYS_MFP_P16_MISO_0 | SYS_MFP_P17_SPICLK0;

    

    

        /* Select HXT as the clock source of SPI1 */

    CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL1_SPI0_S_HCLK, MODULE_NoMsk);


    /* Enable SPI1 peripheral clock */

    CLK_EnableModuleClock(SPI0_MODULE);

    

    /* Lock protected registers */

    SYS_LockReg();

    

    

    /* Configure SPI1 as a master, MSB first, 8-bit transaction, SPI Mode-0 timing, clock is 6MHz */

    SPI_Open(SPI0, SPI_MASTER, SPI_MODE_0, 8, 6000000);


    /* Enable the automatic hardware slave select function. Select the SS0 pin and configure as low-active. */

    SPI_EnableAutoSS(SPI0, SPI_SS, SPI_SS_ACTIVE_LOW);

}




SPI_CNTRL 레지스터





M052LBN SPI 송수신 함수

unsigned char SPI0_WriteReadByte(unsigned char Data)

{

    SPI_WRITE_TX0(SPI0, Data);

    /* Trigger SPI transfer */

    SPI_TRIGGER(SPI0);


    /* Check busy state */

    while(SPI_IS_BUSY(SPI0));


   return SPI_READ_RX0(SPI0);

}


Posted by nexp

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