电子发烧友网>电子资料下载>类型>参考设计>AD5677R NanDAC+IIO Linux驱动程序

AD5677R NanDAC+IIO Linux驱动程序

2512820 2021-03-23 | pdf | 85.13KB | 次下载 | 3积分

资料介绍

This version (20 Nov 2020 10:33) was approved by Alexandru Ardelean.The Previously approved version (20 Nov 2020 10:30) is available.

nanoDAC+ IIO DAC Linux Driver
Source Code
- Status
- Files
- Devicetree
Driver testing
Buffer Support
More Information

nanoDAC+ IIO DAC Linux Driver

Supported Devices

This driver supports the

Reference Circuits

CN0229

Evaluation Boards

Description

This is a Linux industrial I/O (IIO) subsystem driver, targeting multi-channel serial interface DACs. The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2c, spi, etc). See IIO for more information.

Source Code

Status

Source	Mainlined?
git	Yes

Files

Function	File
driver	https://github.com/analogdevicesinc/linux/blob/master/drivers/iio/dac/ad5686.c
driver	https://github.com/analogdevicesinc/linux/blob/master/drivers/iio/dac/ad5686.h
driver	https://github.com/analogdevicesinc/linux/blob/master/drivers/iio/dac/ad5686-spi.c
driver	https://github.com/analogdevicesinc/linux/blob/master/drivers/iio/dac/ad5696-i2c.c

Devicetree

Required devicetree properties for spi devices:

compatible: Needs to be the name of the device. E.g. “ad5676”
reg: The chipselect number used for the device
spi-max-frequency: Maximum SPI clock frequency.
spi-cpol: Needs to be set for the correct SPI mode
vcc-supply: Phandle to the fixed regulator
interrupts: the interrupt used for buffer sampling
pwms: pwm pin used as the interrupt source

        adc_vref: fixedregulator@0 {
	        compatible = "regulator-fixed";
		regulator-name = "fixed-supply";
		regulator-min-microvolt = <2500000>;
		regulator-max-microvolt = <2500000>;
		regulator-boot-on;
	};

	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";

	ad5676@0 {
		compatible = "ad5676";
		reg = <0>;
		spi-max-frequency = <1000000>;
		spi-cpha;
		vcc-supply = <&adc_vref>;

             interrupts = <25 IRQ_TYPE_EDGE_RISING>;          
             interrupt-parent = <&gpio>;                      
                                                                                   
             pwms = <&pwm 0 100>;                             
             pwm-names = "pwm-trigger";
	};

Required devicetree properties for i2c devices:

compatible: Needs to be the name of the device. E.g. “AD5696”
reg: The chipselect number used for the device
vcc-supply: Phandle to the fixed regulator
interrupts: the interrupt used for buffer sampling
pwms: pwm pin used as the interrupt source

        adc_vref: fixedregulator@0 {
	        compatible = "regulator-fixed";
		regulator-name = "fixed-supply";
		regulator-min-microvolt = <2500000>;
		regulator-max-microvolt = <2500000>;
		regulator-boot-on;
	};

	#address-cells = <1>;
	#size-cells = <0>;
	status = "okay";

	ad5696@e {
		    compatible = "ad5696";
		    reg = <0xe>;
		    vcc-supply = <&adc_vref>;

                 interrupts = <25 IRQ_TYPE_EDGE_RISING>;          
                 interrupt-parent = <&gpio>;                      
                                                                                   
                 pwms = <&pwm 0 100>;                             
                 pwm-names = "pwm-trigger";
	};

Driver testing

This specifies any shell prompt running on the target

root:/> cd /sys/bus/iio/devices/
root:/sys/bus/iio/devices> ls
iio:device0

root:/sys/bus/iio/devices> cd iio/:device0

root:/sys/bus/iio/devices/iio:device0> ls -l
drwxr-xr-x 2 root root    0 Jul 31 15:17 buffer
-r--r--r-- 1 root root 4096 Jul 31 15:17 dev
-r--r--r-- 1 root root 4096 Jul 31 15:17 name
lrwxrwxrwx 1 root root    0 Jul 31 15:17 of_node -> ../../../../../../../../firmware/devicetree/base/soc/spi@7e204000/ad5679r@0
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage0_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage0_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage0_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage10_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage10_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage10_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage11_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage11_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage11_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage12_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage12_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage12_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage13_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage13_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage13_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage14_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage14_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage14_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage15_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage15_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage15_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage1_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage1_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage1_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage2_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage2_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage2_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage3_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage3_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage3_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage4_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage4_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage4_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage5_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage5_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage5_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage6_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage6_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage6_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage7_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage7_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage7_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage8_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage8_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage8_raw
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage9_powerdown
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage9_powerdown_mode
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage9_raw
-r--r--r-- 1 root root 4096 Jul 31 15:17 out_voltage_powerdown_mode_available
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage_sampling_frequency
-rw-r--r-- 1 root root 4096 Jul 31 15:17 out_voltage_scale
drwxr-xr-x 2 root root    0 Jul 31 15:17 power
drwxr-xr-x 2 root root    0 Jul 31 15:17 scan_elements
lrwxrwxrwx 1 root root    0 Jul 31 15:17 subsystem -> ../../../../../../../../bus/iio
drwxr-xr-x 2 root root    0 Jul 31 15:17 trigger
-rw-r--r-- 1 root root 4096 Jul 31 15:17 uevent

Show device name

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> cat name
ad5696

Show scale

Description:
scale to be applied to in_voltage0_raw in order to obtain the measured voltage in millivolts.

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> cat out_voltage_scale 
0.038146972

Set channel Y output voltage

Description:
/sys/bus/iio/devices/deviceX/out_voltageY_raw

Raw (unscaled, no bias etc.) output voltage for channel Y.

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> echo 10000 > out_voltage0_raw

U = out_voltage0_raw * out_voltage_scale = 10000 * 0.038140 = 381.40 mV

List available power down modes

/sys/bus/iio/devices/deviceX/out_powerdown_mode_available

Description:
Lists all available output power down modes.

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> cat out_voltage_powerdown_mode_available
1kohm_to_gnd 100kohm_to_gnd three_state

Set channel Y power down mode

/sys/bus/iio/devices/deviceX/out_voltageY_powerdown_mode

Description:
Specifies the output power down mode. DAC output stage is disconnected from the amplifier and

1kohm_to_gnd	connected to ground via an 1kOhm resistor
100kohm_to_gnd	connected to ground via an 100kOhm resistor
three_state	left floating

For a list of available output power down options read out_voltageX_powerdown_mode_available.

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> echo three_state > out_voltage0_powerdown_mode
root:/sys/bus/iio/devices/iio:device0> cat out_voltage0_powerdown_mode
three_state

Enable power down mode on output Y

/sys/bus/iio/devices/deviceX/out_voltageY_powerdown

Description:
Writing 1 causes output Y to enter the power down mode specified by the corresponding out_voltageY_powerdown_mode. Clearing returns to normal operation. Y may be suppressed if all outputs are controlled together.

This specifies any shell prompt running on the target

root:/sys/bus/iio/devices/iio:device0> echo 1 > out_voltage0_powerdown
root:/sys/bus/iio/devices/iio:device0>  cat out_voltage0_powerdown
1
root:/sys/bus/iio/devices/iio:device0> echo 0 > out_voltage0_powerdown
root:/sys/bus/iio/devices/iio:device0>  cat out_voltage0_powerdown
0

Buffer Support

Description:
The nanoDAC family of devices has buffer support for changing the output of the DAC channels. To achieve this a PWM signal is used as the device trigger to output data. Using a sampling frequency attribute the period of the PWM signal can be changed. The sampling frequency is in Hz.

In order to use this functionality the interrupt pin must be tied to the PWM generation pin

This specifies any shell prompt running on the target

root@analog:/sys/bus/iio/devices/iio:device0 $ cat out_voltage_sampling_frequency 
1000
root@analog:/sys/bus/iio/devices/iio:device0# echo 2000 > out_voltage_sampling_frequency
root@analog:/sys/bus/iio/devices/iio:device0# cat out_voltage_sampling_frequency
2000

Enable buffered channels

Description:
The user has to enable on what channels to output the buffer samples. The samples are interleaved in the following in the order of the enabled channels.

Example:

sample_ch0|sample_ch1|sample_ch2

If only channel 1 is enabled the buffer samples will have the following configuration:

sample_ch1|sample_ch1|sample_ch1

This specifies any shell prompt running on the target

root@analog:/sys/bus/iio/devices/iio:device0# cd scan_elements/
root@analog:/sys/bus/iio/devices/iio:device0/scan_elements# ls
out_voltage0_en      out_voltage10_type   out_voltage12_index  out_voltage14_en     out_voltage15_type	out_voltage2_index  out_voltage4_en	out_voltage5_type   out_voltage7_index	out_voltage9_en
out_voltage0_index   out_voltage11_en	  out_voltage12_type   out_voltage14_index  out_voltage1_en	out_voltage2_type   out_voltage4_index	out_voltage6_en     out_voltage7_type	out_voltage9_index
out_voltage0_type    out_voltage11_index  out_voltage13_en     out_voltage14_type   out_voltage1_index	out_voltage3_en     out_voltage4_type	out_voltage6_index  out_voltage8_en	out_voltage9_type
out_voltage10_en     out_voltage11_type   out_voltage13_index  out_voltage15_en     out_voltage1_type	out_voltage3_index  out_voltage5_en	out_voltage6_type   out_voltage8_index
out_voltage10_index  out_voltage12_en	  out_voltage13_type   out_voltage15_index  out_voltage2_en	out_voltage3_type   out_voltage5_index	out_voltage7_en     out_voltage8_type
root@analog:/sys/bus/iio/devices/iio:device0/scan_elements# echo 1 > out_voltage0_en

root@analog:/sys/bus/iio/devices/iio:device0/scan_elements# cd ../buffer/
root@analog:/sys/bus/iio/devices/iio:device0/buffer# ls
data_available	enable	length	watermark
root@analog:/sys/bus/iio/devices/iio:device0/buffer# echo 1 > enable

Sending a buffer sample example:

This specifies any shell prompt running on the target

root@analog:/sys/bus/iio/devices/iio:device0/buffer# echo -n -e '/x22/x33' > /dev/iio/:device0

More Information

Need Help?

31 Jul 2012 17:53 · Lars-Peter Clausen

02 Mar 2011 15:16

adi

下载该资料的人也在下载下载该资料的人还在阅读

更多 >

怎么编写Framebuffer驱动程序 403次阅读
自动删除SDK/Vitis下驱动程序的旧版本的Linux脚本 558次阅读
如何写一个Linux设备驱动程序 4314次阅读
米尔科技LINUX设备驱动程序教程 1966次阅读
嵌入式Linux内核的驱动程序开发是怎样的 1415次阅读
浅谈电脑驱动程序的工作原理详解电脑驱动程序意义 2.9w次阅读
基于嵌入式Linux内核的系统设备驱动程序开发设计 1113次阅读
基于Linux2.6.30开发DS18B20的驱动程序的类型和文件操作接口函数详解 1377次阅读
可动态安装的Linux设备驱动程序 957次阅读
如何用嵌入式Linux系统编写键盘驱动 1312次阅读
8255A驱动程序 3193次阅读
8155驱动程序 3057次阅读
深入了解USB驱动之总线驱动程序 8685次阅读
Xilinx设备的驱动程序 7967次阅读
PCI驱动程序开发实例 6702次阅读

资料 -- | 积分 --

查看他上传的所有资料

+关注个人主页

上传资料赚积分

下载排行

本周

1电子电路原理第七版PDF电子教材免费下载
0.00 MB | 1491次下载 | 免费
2单片机典型实例介绍
18.19 MB | 95次下载 | 1 积分
3S7-200PLC编程实例详细资料
1.17 MB | 27次下载 | 1 积分
4笔记本电脑主板的元件识别和讲解说明
4.28 MB | 18次下载 | 4 积分
5开关电源原理及各功能电路详解
0.38 MB | 11次下载 | 免费
6100W短波放大电路图
0.05 MB | 4次下载 | 3 积分
7基于单片机和 SG3525的程控开关电源设计
0.23 MB | 4次下载 | 免费
8基于AT89C2051/4051单片机编程器的实验
0.11 MB | 4次下载 | 免费

本月

1OrCAD10.5下载OrCAD10.5中文版软件
0.00 MB | 234313次下载 | 免费
2PADS 9.0 2009最新版 -下载
0.00 MB | 66304次下载 | 免费
3protel99下载protel99软件下载(中文版)
0.00 MB | 51209次下载 | 免费
4LabView 8.0 专业版下载 (3CD完整版)
0.00 MB | 51043次下载 | 免费
5555集成电路应用800例(新编版)
0.00 MB | 33562次下载 | 免费
6接口电路图大全
未知 | 30320次下载 | 免费
7Multisim 10下载Multisim 10 中文版
0.00 MB | 28588次下载 | 免费
8开关电源设计实例指南
未知 | 21539次下载 | 免费

总榜

1matlab软件下载入口
未知 | 935053次下载 | 免费
2protel99se软件下载(可英文版转中文版)
78.1 MB | 537793次下载 | 免费
3MATLAB 7.1 下载 (含软件介绍)
未知 | 420026次下载 | 免费
4OrCAD10.5下载OrCAD10.5中文版软件
0.00 MB | 234313次下载 | 免费
5Altium DXP2002下载入口
未知 | 233046次下载 | 免费
6电路仿真软件multisim 10.0免费下载
340992 | 191183次下载 | 免费
7十天学会AVR单片机与C语言视频教程下载
158M | 183277次下载 | 免费
8proe5.0野火版下载(中文版免费下载)
未知 | 138039次下载 | 免费

搜索历史

AD5677R NanDAC+IIO Linux驱动程序

资料介绍

Table of Contents

nanoDAC+ IIO DAC Linux Driver

Supported Devices

Reference Circuits

Evaluation Boards

Description

Source Code

Status

Files

Devicetree

Driver testing

Show device name

Show scale

Set channel Y output voltage

List available power down modes

Set channel Y power down mode

Enable power down mode on output Y

Buffer Support

Enable buffered channels

More Information

评论

下载排行

本周

本月

总榜