Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02

najinaufel — Tue, 22 Apr 2014 17:07:17 GMT

Hi,

I hope I am posting in the right forum.

I have seen this issue on many threads. I learned how to pinpoint the offending address and found that it is the UART0 address.

I am using CW10.5 with FRDM-KE02Z board. I can access the GPIO with no issues but as soon as the first instruction on the PE-generated Init_UART0() routine is executed, I get the Hard Fault.

The UART0 registers seem to be initialized properly (I think):

/** UART - Peripheral register structure */

typedef struct UART_MemMap {

uint8_t BDH; /**< UART Baud Rate Register: High, offset: 0x0 */

uint8_t BDL; /**< UART Baud Rate Register: Low, offset: 0x1 */

uint8_t C1; /**< UART Control Register 1, offset: 0x2 */

uint8_t C2; /**< UART Control Register 2, offset: 0x3 */

uint8_t S1; /**< UART Status Register 1, offset: 0x4 */

uint8_t S2; /**< UART Status Register 2, offset: 0x5 */

uint8_t C3; /**< UART Control Register 3, offset: 0x6 */

uint8_t D; /**< UART Data Register, offset: 0x7 */

} volatile *UART_MemMapPtr;

...

/* UART - Register accessors */

#define UART_BDH_REG(base) ((base)->BDH)

...

/* UART - Peripheral instance base addresses */

/** Peripheral UART0 base pointer */

#define UART0_BASE_PTR ((UART_MemMapPtr)0x4006A000u)

...

#define UART0_BDH UART_BDH_REG(UART0_BASE_PTR)

...

The instruction that fails is:

UART0_C2 &= (uint8_t)~(uint8_t)((UART_C2_TE_MASK | UART_C2_RE_MASK));

showing that the faulty address is 0x4006A000 which is the address of the UART0_BDH register.

Is this a bug in CW 10.5?

Thank you

Re: Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02

mjbcswitzerland — Tue, 22 Apr 2014 21:06:07 GMT

Check whether the clock has been enabled to the UART before accesses are made to it:

UART0 bit in register SIM_SCGC

Regards

Mark

Re: Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02

najinaufel — Tue, 22 Apr 2014 21:35:14 GMT

Hi Mark,

That was it!

Thank you

Naji Naufel

Sr. FAE

Avnet

naji.naufel@avnet.com

3797 Rider Trail South

St. Louis, MO 63045

Office:

314-770-6347

Cell:

314-276-3983

topic Re: Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02 in CodeWarrior Development Tools

Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02

Re: Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02

Re: Getting a Hard Fault Interrupt when accessing the UART0 registers using Processor Expert on KE02