i2c read
I2C 的啟動條件及停止條件. I2C start condition 有二種情況，如上圖所示，虛線表示read 動作時的第二次start condition，實線表示r/w 時的第一次start condition。 I2C stop condition 只有一種情況，如上圖所示。 void i2c_start(void) // for second start signal on i2c_read I2C_SDA = HIGH; I2C_SCL = HIGH; i2c_wait(); // send,,不過依該文所貼的I2C 協定分析儀上的訊號來看, 我猜很可能是8051 master 的read ACK 少做一件事: 沒有在ACK 完成後(SDA 拉為Low, SCL 輸出High, 再輸出Low 之後) 把SDA 訊號放開. 致使SDA 在SCL 為Hi 時上昇, 結果就變成了Stop 訊號了. 我把原作者所貼的圖片作了一下增強, 並加上一些註解, 如下圖: I2C Clock Stretch. , Start之後緊接著又是I2C address，這裡又要注意另外一件事，就是I2C的address有分為兩類，write address與read address，他們的差別在於最後一個bit是0 or 1，0表示write ，1表示read。 例如. Addr=0xA0表示後面的byte是master要寫入slave的資料。 Addr=0xA1表示後面的byte是master要從slave讀出的資料。,benefit of I2C. Figure 2. Basic Internal Structure of SDA/SCL Line. Figure 2 shows a simplified view of the internal structure of the slave or master device on the SDA/SCL lines, consisting of a buffer to read input data, and a pull-down FET to transmit d,This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127. When sending out the 7 bit address, we still always send 8 bits. The extra bit is used to inform the slave if the master is writing to it or reading f, Warning! The I2C 7 bit address should be given a MSB justified byte data. For instance, if the slave device has address of '1100000' (7 bit binary), it should be given as '0xC0' . In this notation, the LSB doesn't need to be cared. Th,Otherwise, if the data direction bit is 1, the master will read from slave device. After the slave address and the data direction is sent, the master can continue with reading or writing. The communication is ended with the Stop condition which also signa,Electric Imp Internet of Things Platform API Documentation for the i2c.read() function. ,The master will simply continue generating clock pulses at a regular interval, and the data will be placed on SDA by either the master or the slave, depending on whether the R/W bit indicated a read or write operation. The number of data frames is arbitra
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 i2c read 相關參考資料
邱小新の單晶片筆記: I2C protocol 原理及應用
I2C 的啟動條件及停止條件. I2C start condition 有二種情況，如上圖所示，虛線表示read 動作時的第二次start condition，實線表示r/w 時的第一次start condition。 I2C stop condition 只有一種情況，如上圖所示。 void i2c_start(void) // for second start signal on i2c_r... http://jyhshin3.blogspot.com 「i2c read」的圖片搜尋結果
:// I2C bus 簡介(Inter-Integrated Circuit Bus) - 傑克! 真是太神奇了! - 痞客邦
不過依該文所貼的I2C 協定分析儀上的訊號來看, 我猜很可能是8051 master 的read ACK 少做一件事: 沒有在ACK 完成後(SDA 拉為Low, SCL 輸出High, 再輸出Low 之後) 把SDA 訊號放開. 致使SDA 在SCL 為Hi 時上昇, 結果就變成了Stop 訊號了. 我把原作者所貼的圖片作了一下增強, 並加上一些註解, 如下圖: I2C Clock Stretc... http://magicjackting.pixnet.ne I2C-協定用法原理簡介-晶片溝通的橋樑- 實作派電子實驗室
Start之後緊接著又是I2C address，這裡又要注意另外一件事，就是I2C的address有分為兩類，write address與read address，他們的差別在於最後一個bit是0 or 1，0表示write ，1表示read。 例如. Addr=0xA0表示後面的byte是master要寫入slave的資料。 Addr=0xA1表示後面的byte是master要從slave讀出... https://www.strongpilab.com Understanding the I2C Bus - Texas Instruments
benefit of I2C. Figure 2. Basic Internal Structure of SDA/SCL Line. Figure 2 shows a simplified view of the internal structure of the slave or master device on the SDA/SCL lines, consisting of a buffe... http://www.ti.com I2C tutorial - Robot Electronics
This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127. When sending out the 7 bit address, we still always send 8 bits. The extra bit is used to infor... http://www.robot-electronics.c I2C access examples | Mbed
Warning! The I2C 7 bit address should be given a MSB justified byte data. For instance, if the slave device has address of '1100000' (7 bit binary), it should be given as '0xC0' . In ... https://os.mbed.com I2C Bus Specification - I2C Info
Otherwise, if the data direction bit is 1, the master will read from slave device. After the slave address and the data direction is sent, the master can continue with reading or writing. The communic... http://i2c.info i2c.read() | Dev Center
Electric Imp Internet of Things Platform API Documentation for the i2c.read() function. https://developer.electricimp. I2C - learn.sparkfun.com
The master will simply continue generating clock pulses at a regular interval, and the data will be placed on SDA by either the master or the slave, depending on whether the R/W bit indicated a read o... https://learn.sparkfun.com |