S12 / MagniV MicrocontrollersのトピックRe: 9S12ZVL IIC software problem

9S12ZVL IIC software problem

huang_hw — Sat, 26 Dec 2015 19:19:54 GMT

I am trying to control an IIC device from my 9S12ZVL board.

Background:

MPU: MC9S12ZVL32MLF (48 pins)

Dev. System: Code Warrior 10.6 Special (with Processor Expert installed)

I am already able to control other IO lines and PWM from software.

When I tried the simplest of initialization and testing WITHOUT using interrupt,

I get stuck at the very beginning when trying to send out the very first byte.

Would be grateful if someone can give me a pointer as to what I have missed?

Thanks.

My IIC code segment:

(all macros generated by Processor Expert)

IIC0IBCR = IIC0IBCR_IBEN_MASK; //enable IIC

//set IIC to Enable, Master and Tx mode, NO interrupt (this should send out a START)

IIC0IBCR = (IIC0IBCR_IBEN_MASK & IIC0IBCR_MS_SL_MASK & IIC0IBCR_TX_RX_MASK);

IIC0IBDR = 0x52U; //write slave address

while ((IIC0IBSR & IIC0IBSR_IBIF_MASK) == 0) {}

(The software is stuck here forever).

kef2 — Mon, 28 Dec 2015 11:02:51 GMT

IIC0IBCR = (IIC0IBCR_IBEN_MASK & IIC0IBCR_MS_SL_MASK & IIC0IBCR_TX_RX_MASK);

huang_hw — Mon, 28 Dec 2015 15:48:40 GMT

Thanks Edward. You are absolutely right.

What would I do without Freescale(NXP?) Community.

I was in this mode where I can see the finest details but become blind to something obvious.

For others following this thread, it should have been

IIC0IBCR = (IIC0IBCR_IBEN_MASK | IIC0IBCR_MS_SL_MASK | IIC0IBCR_TX_RX_MASK);