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ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

Figure 4. Buffer of transmission structure

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).

0

data nb-2

|

|

|

|

nb-3

data2

nb-2

data1

nb-1

sub @

nb

EEPROM @