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MTCH112

 
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JCS83



Joined: 23 Sep 2015
Posts: 1

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MTCH112
PostPosted: Wed Sep 23, 2015 7:59 am     Reply with quote
Hi everyone,

Has anyone here ever worked at the MTCH112 (mTouch chip). I'm having some problems with the read memory command. Someone for discuss about?

Thanks.
Ttelmah



Joined: 11 Mar 2010
Posts: 19549

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PostPosted: Wed Sep 23, 2015 11:32 am     Reply with quote
What's your problem?.
It is fairly standard I2C, except for the checksum:
Code:

#define CHIP_ADDRESS 0xE6
#define READ 1

int1 read_registers(int8 start_register,char * buffer, int8 count)
{
     int8 csum=0;

     i2c_start();
     i2c_write(CHIP_ADDRESS);
     i2c_write(start_register);
     i2c_start();//repeated start
     i2c_write(CHIP_ADDRESS | READ); //read
     
     while(count--)
     {
         *buffer=i2c_read();
         csum ^= *buffer;
         buffer++;
     } //note chip does not require a NACK
     i2c_stop();
     i2c_start();
     i2c_write(CHIP_ADDRESS | READ); //now read checksum
     csum ^= i2c_read();
     i2c_stop();
     return csum; //returns 0 if checksum OK
}


This transfers 'count' bytes into the buffer, starting at 'start_register', and returns 0 if the checksum matches.
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