adc.zip_linux 数据采集_linux数据采集_数据采集 linux_数据采集板

#include <linux/module.h> #include <linux/kernel.h> #include <linux/kdev_t.h> #include <linux/fs.h> #include <linux/cdev.h> #include <asm/uaccess.h> #include <asm/io.h> const int major = 250; const int minjor = 0; const char *drvname = "adc_convertor"; char readbuf[5] = "asdfg"; struct cdev adcDev; unsigned int *ADCCON; unsigned int *ADCMUX; unsigned int *ADCDAT0; int chenhao_open (struct inode* inode, struct file* filp ) { printk(KERN_ALERT"hello, chenhao dev is open"); return 0; } int chenhao_release(struct inode* inode, struct file* filp ) { printk(KERN_ALERT"chenhao dev is close"); return 0; } const char adsheet[10]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; int chenhao_read( struct file* filp, char __user* buffer, int len, loff_t* offset) { if ( len > sizeof(readbuf) ) { len = sizeof(readbuf); } // while(! ((*ADCCON) & 0x8000)); unsigned int adcdata; adcdata = 1111111; // adcdata = ((*ADCDAT0) & 0x3ff); adcdata = adcdata * 3.3; int bit4 = adcdata/1000; readbuf[3] = adsheet[bit4]; int bit3 = (adcdata%1000)/100; readbuf[2] = adsheet[bit3]; int bit2 = ((adcdata%1000)%100)/10; readbuf[1] = adsheet[bit2]; int bit1 = (((adcdata%1000)%100)%10)%10; readbuf[0] = adsheet[bit1]; copy_to_user( buffer, readbuf , len ); return len; } int chenhao_write ( struct file* filp, const char __user* buffer, int len, loff_t* offset) { if ( len>sizeof(readbuf)) { len = sizeof(readbuf) -1 ; } copy_from_user( readbuf, buffer , len); readbuf[len] = '\0'; return len; } #define SWITCH_MAGIC 'a' #define NUM_ONE _IO( SWITCH_MAGIC,1 ) #define NUM_TWO _IO( SWITCH_MAGIC,2 ) int chenhao_ioctl( struct inode* inode, struct file* filp, unsigned int cmd, unsigned long arg ) { switch( cmd ) { case NUM_ONE: *ADCMUX = 0; // printk(KERN_ALERT" This ioctl arg =0x%x\r\n", ADCCON); break; case NUM_TWO: *ADCMUX= 1; // printk(KERN_ALERT"This ioctl arg = 0x%x\r\n" ,ADCCON); break; default: break; } } struct file_operations my_hello_ops = { .owner = THIS_MODULE, .open = chenhao_open, .release = chenhao_release, .read = chenhao_read, .write = chenhao_write, .ioctl = chenhao_ioctl }; int chenhao_init(void) { int ret; dev_t devnum = MKDEV( major, minjor ); ret = register_chrdev_region( devnum, 1 , "adc_dev" ); if ( ret<0 ) { return ret; } cdev_init( &adcDev, &my_hello_ops ); ret = cdev_add ( &adcDev, devnum, 1 ); if ( ret ) { goto err; } // int preScaler = 65; ADCCON = ioremap( 0xf3000000, 4 ); *ADCCON = (1<<14)| (65<<6)| (0<<3) | (0<<2) | (1<<1); ADCMUX = ioremap( 0xf300001c, 4 ); ADCDAT0 = ioremap( 0xf300000c, 4); printk(KERN_ALERT"module install %s \r\n",drvname); return 0; err: unregister_chrdev_region ( MKDEV(major,minjor), 1 ); return -ret; } void chenhao_cleanup(void) { iounmap( ADCCON ); iounmap( ADCMUX ); iounmap( ADCDAT0); cdev_del (&adcDev ); unregister_chrdev_region ( MKDEV(major,minjor), 1 ); printk(KERN_ALERT"module install %s \r\n",drvname); } module_init( chenhao_init ); module_exit( chenhao_cleanup ); MODULE_AUTHOR( "chen hao "); MODULE_DESCRIPTION( " This is my hello simple module "); MODULE_LICENSE ( "GPL" );