AN1045 查看數據表（PDF） - STMicroelectronics

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AN1045

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

STMicroelectronics 

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

Figure 4. Buffer of transmission structure

0

|

|

nb-3

nb-2

nb-1

nb

data nb-2

|

|

data2

data1

sub @

EEPROM @

The buffer of transmission contains the EEPROM address, the sub address (the address

where you want to write into the EEPROM) and then the data to transmit.

In this application, a parameter called “n” allows you to modify the number of data to transmit

and then to receive. The number of data is “n-1”, that means that in this application, as 3 data

have to be sent, “n=4”.

The transmission function is based on a double shift: a shift of the “count” variable to call 8

times the function I2Cm_TxData (to send the 8 bits of one data byte) and a shift into the

I2Cm_TxData function to always send the MSB of the data (refer to Figure 5).

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