有偿求ADI公司AD1933 LINUX平台驱动

liuxiaodong · 发表于 2021-12-23 11:05

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有偿求ADI公司AD1933 LINUX平台通过SPI配置AD1933，通过SAI接口（4路数据）传输音频信号

damengshu · 发表于 2021-12-23 13:54

1、驱动源代码

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <asm/irq.h>
#include <asm/arch/regs-timer.h>
#include <asm/arch/regs-adc.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/map.h>
#include <asm/arch/regs-irq.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/clk.h>
#include <linux/cdev.h>

#define ADC_WRITE(ch, prescale) ((ch) << 16 | (prescale))

#define ADC_WRITE_GETCH(data) (((data) >> 16) & 0x7)
#define ADC_WRITE_GETPRE(data) ((data) & 0xff)

#define DEVICE_NAME "adc"

static void __iomem *base_addr;

typedef struct {                   //adc转换的设备结构体
wait_queue_head_t wait; //等待队列
int channel;          //ADC转换通道
int prescale;
}ADC_DEV;

DECLARE_MUTEX(ADC_LOCK); //定义互斥信号量
static int ADC_OK = 0;

static ADC_DEV adcdev;
static volatile int ev_adc = 0;
static int adc_data;

static struct clk *adc_clock;

#define ADCCON    (*(volatile unsigned long *)(base_addr + S3C2410_ADCCON)) //ADC control
#define ADCTSC    (*(volatile unsigned long *)(base_addr + S3C2410_ADCTSC)) //ADC touch screen control
#define ADCDLY    (*(volatile unsigned long *)(base_addr + S3C2410_ADCDLY)) //ADC start or Interval Delay
#define ADCDAT0    (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT0)) //ADC conversion data 0
#define ADCDAT1    (*(volatile unsigned long *)(base_addr + S3C2410_ADCDAT1)) //ADC conversion data 1
#define ADCUPDN    (*(volatile unsigned long *)(base_addr + 0x14))       //Stylus Up/Down interrupt status

#define PRESCALE_DIS       (0 << 14)
#define PRESCALE_EN       (1 << 14) //使能预分频
#define PRSCVL(x)          ((x) << 6)//设定的预分频值
#define ADC_INPUT(x)       ((x) << 3)  //选择ADC转换通道
#define ADC_START       (1 << 0) // 启动ADC转换
#define ADC_ENDCVT       (1 << 15)

//AD转换中断处理函数
static irqreturn_t adcdone_int_handler(int irq, void *dev_id)
{undefined
if (ADC_OK)
{undefined
      adc_data = ADCDAT0 & 0x3ff; //提取AD转换后的数据

      ev_adc = 1;  //转换结束唤醒等待的进程
      wake_up_interruptible(&adcdev.wait);
}

return IRQ_HANDLED;
}

static ssize_t s3c2410_adc_read(struct file *filp, char *buffer, size_t count, loff_t *ppos)
{undefined
char str[20];
int value;
size_t len;
if (down_trylock(&ADC_LOCK) == 0) //获得信号量：获得不到信号量不会阻塞
{undefined
      ADC_OK = 1;//启动AD转换
      ADCCON = PRESCALE_EN | PRSCVL(adcdev.prescale) | ADC_INPUT((adcdev.channel)) ;
      //使能预分频设置预分频值  选择ADC转换通道
      ADCCON |= ADC_START; //启动AD转换

      wait_event_interruptible(adcdev.wait, ev_adc);  //阻塞等待AD转换

      ev_adc = 0;//清除转换标志位

//       printk("AIN[%d] = 0x%04x, %d\n", adcdev.channel, adc_data, ADCCON & 0x80 ? 1:0);

      value = adc_data; //AD转换的数据
      sprintf(str,"%5d", adc_data);//数据转换
      //copy_to_user(buffer, (char *)&adc_data, sizeof(adc_data));

      ADC_OK = 0;
      up(&ADC_LOCK);//释放信号量
}
else
{undefined
      value = -1;
}

len = sprintf(str, "%d\n", value);
if (count >= len)
{undefined
      int r = copy_to_user(buffer, str, len); //把AD转换数据送回用户空间
      return r ? r : len;
}
else
{undefined
      return -EINVAL;
}
}

static int s3c2410_adc_open(struct inode *inode, struct file *filp)
{undefined
init_waitqueue_head(&(adcdev.wait));  //初始化等待队列

adcdev.channel=0;       //选择ADC转换的通道 //AIN 0 or (0~7)
adcdev.prescale=0xff;       //AD转换延时

printk( "ADC opened\n");
return 0;
}

static int s3c2410_adc_release(struct inode *inode, struct file *filp)
{undefined
printk( "EmbedSky-ADC closed\n");
return 0;
}

static struct file_operations Adc_fops = {undefined
owner: THIS_MODULE,
open: s3c2410_adc_open,
read: s3c2410_adc_read,
release: s3c2410_adc_release,
};

static struct miscdevice misc = {undefined
.minor = MISC_DYNAMIC_MINOR,
.name = DEVICE_NAME,
.fops = &Adc_fops,
};

static char __initdata banner[] = "S3C2440 ADC\n";

static int __init Adc_init(void)
{undefined
int ret;
printk(banner);

base_addr=ioremap(S3C2410_PA_ADC,0x20);//映射把物理地址映射为虚拟地址
if (base_addr == NULL)  //返回值检测
{undefined
      printk(KERN_ERR "Failed to remap register block\n");
      return -ENOMEM;
}

adc_clock = clk_get(NULL, "adc"); //获得ADC的时钟
if (!adc_clock)
{undefined
      printk(KERN_ERR "failed to get adc clock source\n");
      return -ENOENT;
}
clk_enable(adc_clock);//使能ADC的时钟

/* normal ADC */
ADCTSC = 0;//不使用触摸屏

ret = request_irq(IRQ_ADC, adcdone_int_handler, IRQF_SHARED, DEVICE_NAME, &adcdev);//注册中断
if (ret)
{undefined
      iounmap(base_addr);
      return ret;
}

ret = misc_register(&misc);//注册一个混杂设备

printk(DEVICE_NAME " initialized\n");
return ret;
}

static void __exit Adc_exit(void)
{undefined
free_irq(IRQ_ADC, &adcdev);//注销中断
iounmap(base_addr); //解除映射

if (adc_clock)
{undefined
      clk_disable(adc_clock);//关闭adc转换的时钟
      clk_put(adc_clock);
      adc_clock = NULL;
}

misc_deregister(&misc);//注销混杂设备
}

EXPORT_SYMBOL(ADC_LOCK);

module_init(Adc_init);
module_exit(Adc_exit);

MODULE_LICENSE("GPL");
2、应用程序

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#include <linux/input.h>
int main(void)
{undefined
int adc_fd;
int count;
char adc[6];
adc_fd = open("/dev/adc", O_RDWR); //以阻塞的方式打开设备文件
if (adc_fd < 0) {undefined
      perror("open device adc_fd");
      exit(1);
}

for (;;) {undefined
      count = read(adc_fd,&adc,sizeof(adc));
      adc[count]='\0';
      printf(" adc = %s\n", adc);
            sleep(2);//2秒钟采样一次

}

close(adc_fd);
return 0;
}
希望能帮到你

liuxiaodong · 发表于 2021-12-23 16:28

damengshu 发表于 2021-12-23 13:54
* p v+ b% d: H1、驱动源代码

可是我没有那些宏定义与头文件啊？

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