topic Re: Access indivisual bits in k60 MCU in Kinetis Microcontrollers

Access indivisual bits in k60 MCU

arunkumar1989 — Wed, 17 Jun 2015 03:52:23 GMT

Hello Everyone,

This question is very basic.

I would like to know the syntax for accessing individual bits .

For example Consider this register

I2C0_C1

I would like to access the MST bit in this register.I'm not sure how to code it in code warrior.

For example in microchip's MPLAB IDE it is done like this:

I2C0_C1bits.MST = 1; //start command

Is there any equivalent syntax in freescale cw?

I know i can OR a value to the I2C0_C1 register like this

I2C0_C1 |= I2C_C1_MST_MASK;

,but that is another alternative.

Thanks in advance,

Re: Access indivisual bits in k60 MCU

Alice_Yang — Wed, 17 Jun 2015 06:21:39 GMT

Hello Ak,

On CW, it only can us the method you mentioned "I2C0_C1 |= I2C_C1_MST_MASK;" ,

we can see that , in the header file "MK60D10.h" , it have not define the bits of the I2C_C1 register.

And why you need use the method of "I2C0_C1bits.MST = 1;"? If it must be us the method ,you can copy the difine to the header file .

Have a great day,
Alice

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Re: Access indivisual bits in k60 MCU

arunkumar1989 — Wed, 17 Jun 2015 06:51:41 GMT

Hello Alice,

Thanks for the reply.Yes i figured as much.

Its not a big issue but if there was any implementation of accessing the individual bits ,it would be very help,for example i could directly return the status with a single call like this:

int myfuction()

{

//data

return I2C0_C1bits.MST;

}

Re: Access indivisual bits in k60 MCU

Alice_Yang — Wed, 17 Jun 2015 07:04:48 GMT

Oh Arun,

I think you can only define the bits on header file by yourself .

Alice