IT Lab艾鍗學院技術Blog: spi 的搜尋結果

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2015年5月7日星期四

使用LA分析儀進行SPI訊號量測

Raspberry Pi Education Kit used for SPI

P1-19 (MOSI) --> 連接 LA's CH4

P1-21 (MISO) --> 連接LA's CH2

P1-23 (CLK) --> 連接LA's CH3

P1-24 (CE0) -- > SPI Flash (MX25L4005A)

P1-26 (CE1) --> CC2500 2.4G RF模組


將LA分析儀的訊號量測線連接到子板的SPI 訊號線上

SPI Flash (MX25L4005A) 電路圖

MX25L4005A 電路圖

取樣數及取樣頻率設好後, 再設定觸發訊號的型式, 即可量到的SPI訊號 (註: 圖CE0 並沒有接)

選擇使用SPI Protocol 進行分析

是否要進行Channel更名

套用SPI Protocol 進行分析後, 更方便通訊的狀況了才好Debug , 是否和DataSheet 的結果一致?

MX25L4005A DataSheet

這是程式執行的結果, 執行讀Flash ID 的動作, 和DataSheet 說明一致

The RDID instruction is for reading the manufacturer ID of 1-byte and followed by Device ID of 2-byte. The MXIC Manufacturer ID is C2(hex), the memory type ID is 20(hex) as the first-byte device ID, and the individual device ID of second-byte ID is as followings: 13(hex) for MX25L4005A.

程式片段

Tool 軟體下載

Saleae Logic Analyzer

2019年2月28日星期四

micro:bit 擴充板 -- Nexus:bit

適合初學者的最佳DIY機器人教育套件 -- Nexus:bit

Nexus:bit為一款針對micro:bit所做的模組化動力套件，它整合各種子元件並大幅簡化電路接線。擁有了 Nexus:bit再結合micro:bit 圖形化的積木編程，不論是新手或老手，都能快速打造出micro:bit 各種應用，包含無線遙控車、機械手臂、人型機器人....

micro:bit 具備圖形編程平台也支援python 語言撰寫。
Nexus:bit 功能描述

擴充板具有獨立電源開關
18650鋰電池座與18650充電系統
具有電源指示燈及充電指示燈
電池反接偵測(反接無法啓動電源)
可以同時控制12個伺服馬達+2個直流馬達
RGB彩色 LED燈
蜂鳴器
振動器
麥克風音量偵測 (可以調整霊敏度)
超音波測距感測器連接腳座
micro:bit完整擴充腳位及額外I2C、SPI引腳
5V/3V 輸出接腳
香菇頭搖桿(上下左右及A,B兩按鍵)

Note: 當接入USB外部電源時，會自動切斷18650電池電源, Nexus:bit 電源會來自USB外部電源

Nexus:bit Shield v1.0

USB External Power Supply with high current fuse protection
Li-ion 18650 Battery Holder
Li-ion 18650 charger system
Short circuit protection
Power On/Off switch with LED indicator (On: High-Brightness Green LED)
PCA9685 (PWM for Servo Motor and RGB LED)

Servo: PWM connectorx12
RGB LED: PWM (PWM 8,9,10)

DC Motor x2
GPIO

Buzzer x1
Vibratorx1
LEDx1

Micro:bit PWM/Digital Output pin
Sound detection Module with a built-in potentiometer to adjust the sensitivity of the digital output pin.
Edge connector
Front interface for Joystick

Analog pin P1 (X),P2(Y), Button A, Button B

Front interface for ultrasonic distance sensor (HC-SR04)
I2C connector x2
SPI connector x1
5V/3V Output connectorx2

※Li-ion 18650 可以採購2000mAH~2500mAH以上

Nexus:bit 電子產品檢測認證 Safety

Nexus:bit Pinmap

Pin	Type	Function
0	Touch	Pad 0	P0 or Buzzer (by Jumper)
1	Touch	Pad 1	Joystick AD
2	Touch	Pad 2	Joystick AD
3	Analog	Column 1	X
4	Analog	Column 2	X
5	Digital	Button A	Joystick Button A
6	Digital	Row 2	X
7	Digital	Row 1	X
8	Digital		Viberator
9	Digital	Row 3	X
10	Analog	Column 3	X
11	Digital	Button B	Joystick Button B
12	Digital		Microphone/LED1
13	Digital	SPI MOSI	SPI MOSI/M1A
14	Digital	SPI MISO	SPI MISO/ M1B
15	Digital	SPI SCK	SPI SCK/ M2A
16	Digital		SPI CE/ M2B
19	Digital	I2C SCL	I2C SCL for PCA9685
20	Digital	I2C SDA	I2C SDA for PCA9685

Nexus:bit 電路圖下載

2023年10月4日星期三

Linux kernel : SPI device 兩種存取模式

Raw SPI Device Access

$ sudo modprobe spi_bcm2835

$ ls -l /dev/spidev*

crw-rw---- 1 root spi 153, 0 Nov 19 11:13 /dev/spidev0.0

crw-rw---- 1 root spi 153, 1 Nov 19 11:13 /dev/spidev0.1

Now everything is ready to access the SPI devices from a user-space application using the SPIDEV interface. There is abundant documentation in the Internet on how to use SPIDEV in application code.

Access SPI Flash as MTD

sudo modprobe mtd

sudo modprobe spi-nor

sudo insmod m25p80.ko

/ # cat /proc/mtd
dev: size erasesize name
mtd0: 00020000 00020000 "flash_uboot_env"
mtd1: 00a00000 00020000 "flash_linux_image"
mtd2: 005e0000 00020000 "flash_jffs2"
mtd3: 00100000 00010000 "spi_flash_part0"
mtd4: 00300000 00010000 "spi_flash_part1"