TCA6416A: sample code

Hi William,

Some Pseudo code would look like: 

Writes: 

#define TCA6416A_address 0x20

void I2C_write(uint8 target_address, uint8 register_address, uint8 data){

//send start bit

//send target address + write bit (0) = 0x20

//send register address = 0x00 - 0x07 (look at register map on table 8-4)

//send data (to be shifted into register)

//send stop bit

}

Reads:

uint8 I2C_read(uint8, target_address, uint8_register_address){

uint8 read_data;

//send start bit

//send target address + write bit (0) = 0x20

//send register address = 0x00 - 0x07 (reg map on table 8-4)

//repeated start

//send target address + read bit (1) = 0x21

//read_data = next 8-bits following the ACK bit from previous transaction

return read_data; 

}

I am following figure 8-9 and 8-10 

Regards,

Tyler

Hi William,

You're welcome! Thank you for your questions. If you have any additional, please submit a new question! 

Regards,

Tyler

Hi William,

 0x40, 0x02, 0xFF, 0xFF - sets the bits in the output port register which refers to the logic that each Pxx configured as OUTPUT will drive. 

You must configure the Pxx as outputs first on port 0. The default state of P00 - P07 = INPUT. The command would look something like this: 

0x40, 0x06, 0x00, 0x00 (sets port 0 and port 1 gpio's direction to OUTPUT).

0x40, 0x02, 0xFF, 0xFF (drives port 0 and port 1 OUTPUTs = HIGH).

Regards,

Tyler