spitest.c

来自「周立功magic2200实验箱linux增补例子。包括（GPIO zlg7290」· C语言 代码 · 共 65 行

#define IN_TGPIO
#include "config.h"
#define  CS   25

/* zi mo */
uint8 const ShowTable[11] = {
      0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xFF};
//     0      1     2     3     4     5     6     7     8     9   all off 

int main()
{
    int spi, gpio;
    uint8 c;
    int i;
    
    spi = open("/dev/SPI1", O_RDWR);
    if(spi == -1)
    {
        printf("\nCan't open SPI1!\n");
        return -1;
    }
    gpio = open("/dev/P0", O_RDONLY);
    if(gpio == -1)
    {
        printf("\nCan't open P0!\n");
        close(spi);
        return -1;
    }
   
    printf("Testing SPI1!\n");
    ioctl(gpio, GPIO_SET_PIN_OUT, CS);   // 74HC595 chip select

    ioctl(spi, SPI_SET_CLKDIV, 0x30);    // Clock Diver
    ioctl(spi, SPI_SET_CPHA_FIRST);      // CHAP
    ioctl(spi, SPI_SET_CPOL_LOW);        // CPOL
    ioctl(spi, SPI_SET_LSBF_BIT7);       // Bit7 First

    for (i = 0; i < 10; i++)
    {
        ioctl(spi, SPI_START);           // Start SPI
        ioctl(gpio, GPIO_CLR_PIN, CS);   // Chip Select
        
        c = ShowTable[i];                // get number

        write(spi, &c, 1);               // Send data

        ioctl(gpio, GPIO_SET_PIN, CS);   // Chip cs
        ioctl(spi, SPI_END);            // end SPI

        printf("show %d\n",i); 
        sleep(1);
    }

    printf("exit\n");
  
    close(gpio);
    close(spi);

    return 0;
}

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