i2c voltmeter

784.5 power management 794.6 view source code 79Chapter 2 character device driver 815.1 character device driver basics 815.2 device instance: system CMOS 825.2.1 driver initialization 835.2.2 open and release 865.2.3 data exchange 885.2.4 find 925.2.5 control 945.3 check data availability 955.3.1 round robin 955.3.2 fasync 985.4 interaction with parallel port 995.5 RTC subsystem 1085.6 pseudo-character driver 1095.7 hybrid driver 1105.8 character device driver precautions 1155.9 view source cod

function is used to initialize the underlying platform, including the power domain, clock, DDR, EMIF, UART, I2C, and timer */{Debug_printstring (devstring );Debug_printstring ("initialization failed! /R/N ");ASM ("mov PC, #0 ");}Else{Debug_printstring (devstring );Debug_printstring ("initialization passed! /R/N ");}// Set Ram pointer to beginning of Ram Space Util_setcurrmemptr (0);/* assign a value to the global variable currmemptr */// Send some in

entries: 2048 (Order: 11,819 2 bytes)Dentry cache hash table entries: 65536 (Order: 6, 262144 bytes)Inode-Cache hash table entries: 32768 (Order: 5, 131072 bytes)Memory: 432 MB = 432 MB totalMemory: 432236kb available (4700 K code, 875 K data, 136 K init, 0 K highmem)Slub: genslabs = 11, hwalign = 32, order = 0-3, minobjects = 0, CPUs = 1, nodes = 1Nr_irqs: 368Mxc IRQ initializedMxc_early serial console at mmio 0x73fbc000 (options '123 ')Console [ttymxc0] EnabledConsole: Color dummy device 80x3

method is to define an of_match_table. If the compatible in the table is the same as the compatible in the device node, the probe function is triggered. For private data of devices, the new kernel does not use plat_data anymore. Instead, it defines various attributes in the node and obtains them using specific APIs in the driver. For details, see the Device Tree. 4. Device Tree Structure: Basic Structure: The structure surrounded by {} is called a node, and the/{} at the beginning of dts is cal

bus that matches the driver. It is during driver registration, find the device that matches the driver and initialize it for pdev. The following describes the main functions completed by stmp3xxx_bat_probe: Obtain the interrupted resources of the power supply device, and implement the Code as follows: Struct resource * vdd5v_irq; Info-> vdd5v_irq = platform_get_resource (pdev, ioresource_irq, 0 ); The following describes the resource. This element stores the most important device resource infor

Monitor cpu temperature in linux-Linux Enterprise Application-Linux server application information. For more information, see the following section. First, emerge ksensors will install lm_sensors along with the dependency. Make sure that the kernel above 2.4 is used and enabled "I2C support" in Character devices and "I2C device interface" in "Hardware sensors support" and "

This project is based on the linux platform on Raspberry Pi and is still under development. Project address: Take a photo . Video Monitoring Self-built hotspot First, let's talk about the communication between the MPU6050 device. The typical communication process is as follows. The first part is the data content, followed by the Register address:1. 0x41 => 0x6B: set the clock and x axis clock2. 0x00 => 0x1B gyroscope range, 250 °/s3

edma dma engine driver [0.321050] vbat: 5000 mV [0.321878] lis3_reg: no parameters [0.325259] SCSI subsystem initialized [0.326052] usbcore: registered new interface driver usbfs [0.326223] usbcore: registered new interface driver hub [0.330168] usbcore: registered new device driver usb [0.330998] omap_i2c 44e0b000. i2c: cocould not find pctldev for node/pinmux @ 44e10800/pinmux_i2c0_pins, deferring probe [0.331037] platform 44e0b000.

It's almost the spring festival. It's a little easier. I have just developed the RTC driver in wince6.0. Here I will introduce it. RTC is a real-time clock ). Currently, most 32-bit processors have their own RTC modules and external RTC modules. Generally, the external RTC is accessed through the I2C bus. If the CPU itself comes with RTC, you can access the RTC module by reading internal registers. If it is external, it will be a little effort, but al

compilation optionSave and exit from kernel ConfigmenuIf we add a new driver to the device, we need to make the changes in the makefile and add the correct path to the Kconfig file in the Kernel/driovers, which can be traced back to the correct device driver kconfig file. This step allows you to add a new portal to the kernel config, allowing you to choose between the Config interface and the driver file to be added to the same directory as the Kconfig file and the makefile fileOpen/kernel/arch

The trick is this kernel starts at the root and looks 332 for nodes the have a ' compatible ' property. The It is generally 333 assumed that the any node with a ' compatible ' property represents a device 334 of some kind, and second, it can be assumed so any node at the root 335 of the ' the ' of the ' either directly attached to the ' processor bus, or is a 336 Miscellaneous System device that cannot is described any other way. 337 for each of these nodes, Linux allocates and registers a 338 P

or without Relays SB -- button switch Q -- circuit switch device Fu -- fuse KM -- Connection Trigger KA--1, instantaneous contact relay 2, instantaneous or no relay 3, AC Relay KT-delay with or without Relays SB -- button switch Sa conversion switch Current Meter Pa Voltmeter PV Active Power Meter PJ Reactive Power Meter pjr Frequency table pf Phase table PPA Maximum demand table (load monitor) PM Power Factor table PPF Active Power table pw Reactive

immediately. Motor Or POT-LIN 3-wire variable resistor Power Supply Res Resistance Resistor Manually press the switch button SWITCH-SPDT two choose one button Voltmeter Gauge VOLTMETER-MILLI music Meter Vterm serial port terminal Electromechanical Motor Inductors Transformer Laplace primitives Laplace transformation Memory ICs Microprocessor ICs Miscellaneous aerial-antenna; atahdd; atmega64; battery; cell

, and the keys on the keyboard can be used to control the opening or combination of switches. (2) If you select "mpmentary_switches", there are 6 switches in the "components" column for calling. After the action, the status will be quickly restored. (3) Select lementary_contacts, and 21 contactor types are available in the components column. (4). Select "timed_contacts", and there are four types of timed contactor in the "components" column for calling. (5). Select "coils_relays" and 55 Types of

follows a summary of the probes I had just done.Just Press ENTER to continue: Enter7:i'll now generate the commands needed to load the I²c modules.Sometimes, a chip is available both through the ISA bus and an i²c bus.ISA bus access is faster, and need to the load an additional driver moduleFor it. If you had the choice, do you want to use the ISA bus or theI2c/smbus (isa/smbus)? ISADisplay:to make the sensors modules behave correctly, add these lines to/etc/modules.conf:#----Cut here----# i²c

#define V4l2_chip_m Atch_i2c_driver 1/* match against I2C DRIVER name */#define V4L2_CHIP_MATCH_I2C_ADDR 2/* match against I2C 7-bit Address */#define V4L2_CHIP_MATCH_AC97 3/* MATCH against Anciliary AC97 CHIP/#define V4l2_chip_match_subdev 4/* match against Subdev index/struct V4l2_dbg_match {__u32 type;/* Match type */union {/* match this Chip, meaning determined by type */__U32 addr; Char name[3

Analog I2C communication control ds1307 read/write hardware clock # Include "Global. H "# include" drv_ds1307.h "# define i2c_clk_port gpiob # define extends gpio_pin_4 # define implements gpiob # define implements writable # define scl_high () gpio_init (i2c_clk_port, small, small) # define scl_low () gpio_init (i2c_clk_port, i2c_clk_pin, timeout) # define sda_high () gpio_init (i2c_sda_port, i2c_sda_pin, timeout W) # define sda_low () gpio_init (i

Int lpc3250_i2c_init (void){Int result;Devno = MKDEV (maid, maid );If (request_irq (IRQ_I2C_2, i2c_lm75interrupt, ir1__trigger_none, DEV_NAME, NULL )){Printk ("can not get irq >>>/n ");Return-1;}If (! Request_mem_region (unsigned long) I2C2_IOBASE,I2C_NR_PORTS * 4, DEV_NAME )){Printk ("lpc3250 iic cannt get io port (I2C) address/n ");Return-ENODEV;}If (! Request_mem_region (unsigned long) maid Ctrl, // maid Ctrl,4, DEV_NAME )){Printk ("lpc3250 iic can

Source: http://topic.csdn.net/u/20090923/21/a4430689-f060-4ab5-86be-2ecb9a631418.html If bsp_noi2c! ; I2C bus driver [HKEY_LOCAL_MACHINE \ drivers \ builtin \ I2C] "Prefix" = "I2C" "DLL" = "I2C. dll" "Order" = DWORD: 0 "Index" = DWORD: 0 "Mode" = DWORD: 1; Mode: 0 = polling, 1 = interrupt "Slaveaddress" = DWORD: 0; bus

address is the address that the processor actually sends to its address bus. Who should the address access? Nand controller ?), This depends on the system bus arbitration of the device, that is, bus arbitration. Currently, common bus arbitration includes axi ahba. These bus schedulers are used to plan the physical address space of the processor. Most processor manuals provide their address map, that is, the distribution of peripherals (registers) in the processor address space. For the process