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by serial
Tue Nov 27, 2018 7:51 am
Forum: Troubleshooting
Topic: I2C not working at a low temperature
Replies: 4
Views: 165

Re: I2C not working at a low temperature

Dear bensimmo,

Thank you for your reply.

Both Raspberry Pi and the I2C sensor were - 10 degree.
The I2C sensor is general sensors (temperature or humidity etc...).
Rpi and the sensor are soldered on the PCB.

I want to know the operating temeperature of I2C peripheral of BCM2835.

Thank you.
by serial
Tue Nov 27, 2018 7:01 am
Forum: Troubleshooting
Topic: I2C not working at a low temperature
Replies: 4
Views: 165

I2C not working at a low temperature

Hello, I tried to get the data from a sensor using Raspberry Pi Zero via I2C, but the communication between the sensor and rpi zero stopped around -10 degree Celsius. Does anyone have the information of operationg temperature of the I2C peripheral? If you have any infromation about the operating tem...
by serial
Thu Jul 12, 2018 1:35 am
Forum: Beginners
Topic: Controlling initial state of GPIO
Replies: 2
Views: 234

Controlling initial state of GPIO

Hello,

How can I set a initial state of GPIO?
I want to pull down the GPIO immediately after start-up.

best regards,
by serial
Tue Feb 20, 2018 9:06 am
Forum: Advanced users
Topic: I2C Clock Unstable
Replies: 4
Views: 554

Re: I2C Clock Unstable

Dear Trev,

Thank you for your useful comment!
I was setting clock stretching to PIC.
I have tried to change the setting of PIC and the clock frequency is stable.

Thank you.
by serial
Mon Feb 19, 2018 9:22 am
Forum: Advanced users
Topic: I2C Clock Unstable
Replies: 4
Views: 554

Re: I2C Clock Unstable

Dear Trev,

Thank you for your comment.
The I2C device is PIC microcontroller.
by serial
Mon Feb 19, 2018 7:02 am
Forum: Advanced users
Topic: I2C Clock Unstable
Replies: 4
Views: 554

I2C Clock Unstable

Hi, I am connecting a Raspberry Pi Zero and a I2C device via I2C with the baudrate of 100 kHz. Monitoring the SCL and SDA line using oscilloscope, the clock frequency is changed once per 10 sec and wrong data is recieved. I attached correct and un-correct SDA line images. Why the I2C clock is unstab...
by serial
Thu Jan 25, 2018 11:56 am
Forum: Advanced users
Topic: Two ENC28J60 Modules connection
Replies: 0
Views: 236

Two ENC28J60 Modules connection

Hello, I want to connect two ENC28J60 Modules to Raspberry Pi Zero. I tried to 1) enable SPI1, 2) connect two ENC28J60 to GPIO, 3) copy enc28j60.dts to enc28j60-2.dts, 4) compile enc28j60-2.dts file, 5) add overlay to /boot/config.txt. After I rebooted, eth0 was running but eth1 didn't run. I doubt ...
by serial
Wed Nov 15, 2017 5:27 am
Forum: Advanced users
Topic: L1 and L2 cache disable
Replies: 0
Views: 276

L1 and L2 cache disable

Hi All,

How can I disable L1 cache and L2 cache?
Is it possible?
I am using Raspberry Zero with Raspbian kernel.

Thank you,
by serial
Thu Aug 31, 2017 2:44 am
Forum: 日本語
Topic: UARTの通信クロックの個別設定について
Replies: 2
Views: 2823

Re: UARTの通信クロックの個別設定について

>matokenさん
sttyコマンドで設定することができました。
迅速なご回答ありがとうございました。
by serial
Thu Aug 31, 2017 2:43 am
Forum: Advanced users
Topic: non-standart USB-UART baudrate setting
Replies: 2
Views: 724

Re: non-standart USB-UART baudrate setting

>karrika
I could set the baudrate.
Thank you so much!
by serial
Mon Aug 28, 2017 5:49 am
Forum: Advanced users
Topic: non-standart USB-UART baudrate setting
Replies: 2
Views: 724

non-standart USB-UART baudrate setting

Hello,

I want to control two UART modules connecting to USB ports of raspberrypi 3 via USB-UART IC (FT232).
Each baudrate of two modules is 115.2 kbps and 3 Mbps, respectively.
How can I set the above baudrate?

Thank you.
by serial
Mon Aug 28, 2017 4:39 am
Forum: 日本語
Topic: UARTの通信クロックの個別設定について
Replies: 2
Views: 2823

UARTの通信クロックの個別設定について

こんにちは。

ラズベリーパイ3のUSBポート2つに、USB/UART変換ICをそれぞれ取り付けて、UART機器を2つ制御したいと考えています。

それぞれの機器のボーレートは、
・1つ目の機器:115.2 kbps
・2つ目の機器:3 Mbps
となっています。

config.txtでUARTのクロック設定をできる、というところまではわかっているのですが、
機器ごとに個別にクロックを設定し、上記の機器制御に対応することは可能なものでしょうか。

よろしくお願いします。
by serial
Wed Sep 28, 2016 2:19 am
Forum: Camera board
Topic: H264 to JPEG
Replies: 0
Views: 291

H264 to JPEG

Hello,

I will take H264 video using Camera Module by raspivid command.
After that, how can I convert the H264 data to the Jpeg data of each frame.

Thank you.
by serial
Wed Sep 28, 2016 2:02 am
Forum: Camera board
Topic: Timestamp
Replies: 1
Views: 426

Timestamp

Hello,

I have a question about timestamps.
When I take a video using Camera Module by raspivid command, how can I get or add timestamps to the H264 video data?

Thank you.
by serial
Fri Sep 02, 2016 12:21 am
Forum: Camera board
Topic: What is the value of shutter speed?
Replies: 3
Views: 841

What is the value of shutter speed?

Hello,

I am using raspberry pi camera module v2 and raspberry pi 3 with the latest raspbian.
I have a question about movie shooting.
How can I check or change the shutter speed of raspivid?

Thank you.
by serial
Tue Apr 19, 2016 12:28 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: High speed UART communication
Replies: 2
Views: 1091

High speed UART communication

Hello,

I'd like to communicate with the other MCU with the baudrate of 500 kbps by UART.
My question is how can I set the 500 kbps baudrate in raspbian.
I am using Raspberry pi 2 model b with the latest raspbian.

Thank you.
by serial
Tue Mar 01, 2016 2:32 am
Forum: Camera board
Topic: High speed shooting
Replies: 0
Views: 224

High speed shooting

Nice to meet you. I'd like to take pictures with the shutter speed of 2.5 milliseconds continuously using a Raspberrypi camera module. I also need a frame rate of 5 - 10 fps. I tried to take pictures using a following command. raspistill -sh 0 -co 0 -br 50 -t 5000 -w 2592 -h 1944 -q 100 -awb auto -t...

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