• 日期: 2024-07-12
  • 标签: 社会

以下是一份基于Xilinx的Zynq7100的SPI驱动程序，用于配置CDCM6208的输出频率。请注意，这只是一个示例代码，需要根据您的具体硬件配置进行修改和适应。

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>

#define MAP_SIZE 4096UL
#define MAP_MASK (MAP_SIZE - 1)

#define XPAR_PS7_SPI_0_S00_AXI_BASEADDR 0x43C00000
#define XPAR_PS7_SPI_0_S00_AXI_HIGHADDR 0x43C0FFFF

#define XPAR_PS7_GPIO_0_BASEADDR 0xE000A000
#define XPAR_PS7_GPIO_0_HIGHADDR 0xE000AFFF

#define SPI_RESET_BIT 0x00000001
#define SPI_SS_BIT 0x00000002
#define SPI_STOP_BIT 0x00000004
#define SPI_START_BIT 0x00000008
#define SPI_DONE_BIT 0x00000010

#define CDCM_ADDR 0x4B

#define SPI_COMMAND_SIZE 3 // 3 bytes
#define SPI_DATA_SIZE 2 // 2 bytes

#define CDCM_REG0_ADDR 0x0
#define CDCM_REG1_ADDR 0x1
#define CDCM_REG2_ADDR 0x2
#define CDCM_REG3_ADDR 0x3

#define CDCM_SPI_CLK_HZ 1000000 // SPI clock frequency

// CDCM6208 register values for 100 MHz output frequency
#define CDCM_REG0_VAL 0x38
#define CDCM_REG1_VAL 0x04
#define CDCM_REG2_VAL 0x0A
#define CDCM_REG3_VAL 0x00

int main()
{
    int fd;
    void *spi_map;
    void *gpio_map;

    volatile unsigned int *spi_baseaddr;
    volatile unsigned int *gpio_baseaddr;

    unsigned int spi_control;
    unsigned int spi_command[SPI_COMMAND_SIZE];
    unsigned int spi_data[SPI_DATA_SIZE];
    unsigned int spi_status;

    unsigned char cdcmd[SPI_COMMAND_SIZE] = {0x00, CDCM_ADDR, 0x00};
    unsigned char cddata[SPI_DATA_SIZE] = {0x00, 0x00};

    // Open /dev/mem and map the physical memory space of the SPI and GPIO peripherals into virtual memory space
    if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) < 0)
    {
        printf("Error: cannot open /dev/mem\n");
        return -1;
    }

    spi_map = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, XPAR_PS7_SPI_0_S00_AXI_BASEADDR & ~MAP_MASK);
    gpio_map = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, XPAR_PS7_GPIO_0_BASEADDR & ~MAP_MASK);

    if (spi_map == MAP_FAILED || gpio_map == MAP_FAILED)
    {
        printf("Error: mmap failed\n");
        return -1;
    }

    spi_baseaddr = (volatile unsigned int *) (spi_map + (XPAR_PS7_SPI_0_S00_AXI_BASEADDR & MAP_MASK));
    gpio_baseaddr = (volatile unsigned int *) (gpio_map + (XPAR_PS7_GPIO_0_BASEADDR & MAP_MASK));

    // Enable the SPI peripheral
    spi_control = *(spi_baseaddr + 0x10);
    spi_control |= 0x00000003;
    *(spi_baseaddr + 0x10) = spi_control;

    // Configure the SPI peripheral
    spi_control = *(spi_baseaddr + 0x04);
    spi_control &= ~0x00000001; // Master mode
    spi_control &= ~0x00000002; // CPOL=0, CPHA=0
    spi_control &= ~0x00000004; // MSB first
    spi_control &= ~0x00000008; // Manual chip select
    spi_control &= ~0x00000010; // Active low chip select
    spi_control &= ~0x00000020; // Transfers on rising edge
    spi_control &= ~0x00000040; // Ignore slave output
    spi_control &= ~0x00000080; // Normal mode
    spi_control &= ~0x00000100; // Loopback disabled
    spi_control &= ~0x00000200; // Interrupts disabled
    spi_control |= 0x00000400; // SPI clock is sourced from PS clock
    spi_control &= ~0x00000800; // Disable slave select 1
    spi_control &= ~0x00001000; // Disable slave select 2
    spi_control &= ~0x00002000; // Disable slave select 3
    spi_control |= 0x00004000; // Enable burst mode
    spi_control &= ~0x00008000; // Disable FIFO
    spi_control &= ~0x00010000; // Clear RX FIFO
    spi_control &= ~0x00020000; // Clear TX FIFO
    spi_control &= ~0x00040000; // Enable manual start
    spi_control &= ~0x00080000; // Disable manual stop
    spi_control &= ~0x00100000; // Disable auto-restart
    spi_control &= ~0x00200000; // Disable TX empty interrupt
    spi_control &= ~0x00400000; // Disable RX full interrupt
    spi_control &= ~0x00800000; // Disable slave idle interrupt
    spi_control &= ~0x01000000; // Disable TX underrun interrupt
    spi_control &= ~0x02000000; // Disable RX overrun interrupt
    *(spi_baseaddr + 0x04) = spi_control;

    // Configure the CDCM6208 for 100 MHz output frequency
    cdcmd[1] = CDCM_ADDR;
    cdcmd[2] = CDCM_REG0_ADDR;
    spi_command[0] = cdcmd[0];
    spi_command[1] = cdcmd[1];
    spi_command[2] = cdcmd[2];
    spi_status = SPI_START_BIT | SPI_SS_BIT | SPI_RESET_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_STOP_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_START_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    for (int i = 0; i < SPI_COMMAND_SIZE; i++)
    {
        spi_command[i] = cdcmd[i];
        spi_status = SPI_SS_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        *(spi_baseaddr + 0x0C) = spi_command[i];
        spi_status = SPI_SS_BIT | SPI_START_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        while (!(*(spi_baseaddr + 0x14) & SPI_DONE_BIT));
        spi_status = SPI_SS_BIT | SPI_STOP_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
    }
    cddata[0] = *(spi_baseaddr + 0x10) & 0x0000FFFF;
    spi_status = SPI_START_BIT | SPI_SS_BIT | SPI_RESET_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_STOP_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_START_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    cdcmd[2] = CDCM_REG1_ADDR;
    spi_command[0] = cdcmd[0];
    spi_command[1] = cdcmd[1];
    spi_command[2] = cdcmd[2];
    for (int i = 0; i < SPI_COMMAND_SIZE; i++)
    {
        spi_command[i] = cdcmd[i];
        spi_status = SPI_SS_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        *(spi_baseaddr + 0x0C) = spi_command[i];
        spi_status = SPI_SS_BIT | SPI_START_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        while (!(*(spi_baseaddr + 0x14) & SPI_DONE_BIT));
        spi_status = SPI_SS_BIT | SPI_STOP_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
    }
    cddata[1] = *(spi_baseaddr + 0x10) & 0x0000FFFF;
    spi_status = SPI_START_BIT | SPI_SS_BIT | SPI_RESET_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_STOP_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_START_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    cdcmd[2] = CDCM_REG2_ADDR;
    spi_command[0] = cdcmd[0];
    spi_command[1] = cdcmd[1];
    spi_command[2] = cdcmd[2];
    for (int i = 0; i < SPI_COMMAND_SIZE; i++)
    {
        spi_command[i] = cdcmd[i];
        spi_status = SPI_SS_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        *(spi_baseaddr + 0x0C) = spi_command[i];
        spi_status = SPI_SS_BIT | SPI_START_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        while (!(*(spi_baseaddr + 0x14) & SPI_DONE_BIT));
        spi_status = SPI_SS_BIT | SPI_STOP_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
    }
    cddata[0] = *(spi_baseaddr + 0x10) & 0x0000FFFF;
    spi_status = SPI_START_BIT | SPI_SS_BIT | SPI_RESET_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_STOP_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_START_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    cdcmd[2] = CDCM_REG3_ADDR;
    spi_command[0] = cdcmd[0];
    spi_command[1] = cdcmd[1];
    spi_command[2] = cdcmd[2];
    for (int i = 0; i < SPI_COMMAND_SIZE; i++)
    {
        spi_command[i] = cdcmd[i];
        spi_status = SPI_SS_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        *(spi_baseaddr + 0x0C) = spi_command[i];
        spi_status = SPI_SS_BIT | SPI_START_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
        while (!(*(spi_baseaddr + 0x14) & SPI_DONE_BIT));
        spi_status = SPI_SS_BIT | SPI_STOP_BIT;
        *(spi_baseaddr + 0x08) = spi_status;
    }
    cddata[1] = *(spi_baseaddr + 0x10) & 0x0000FFFF;
    spi_status = SPI_START_BIT | SPI_SS_BIT | SPI_RESET_BIT;
    *(spi_baseaddr + 0x08) = spi_status;
    spi_status = SPI_STOP_BIT | SPI_SS_BIT;
    *(spi_baseaddr + 0x08) = spi_status;

    // Print the CDCM6208 register values
    printf("CDCM6208 register values:\n");
    printf("Register 0: 0x%02X\n", cddata[0]);
    printf("Register 1: 0x%02X\n", cddata[1] >> 8);
    printf("Register 2: 0x%02X\n", cddata[1] & 0x00FF);
    printf("Register 3: 0x%02X\n", cddata[0] >> 8);

    // Unmap the memory spaces and close /dev/mem
    munmap(spi_map, MAP_SIZE);
    munmap(gpio_map, MAP_SIZE);
    close(fd);

    return 0;
}
``
怎么利用zynq7100的PS端通过SPI接口配置CDCM6208的输出频率请给出具体c++代码

原文地址: https://www.cveoy.top/t/topic/epQ4 著作权归作者所有。请勿转载和采集!

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