AN2295SW bootload Uart error

[eunseokjung]

Hi, all

I'm using MK10 series. I'm practicing bootloader with UART.

The problem is when i run the UART_IsChar() function, it always goes to cpu interrupt.

The UART_IsChar() function is so simple.

#define UART_IsChar() (UART_S1_REG(BOOT_UART_BASE) & UART_S1_RDRF_MASK)

#define BOOT_UART_BASE UART0_BASE_PTR

#define UART0_BASE_PTR                           ((UART_MemMapPtr)0x4006A000u)

#define UART_S1_REG(base)                        ((base)->S1)

#define UART_S1_RDRF_MASK                        0x20u

It is all about UART_IsChar() function.

When i run it, it always goes to CPU interrupt.

Do you have any idea?

Thank you.

[pavel_krenek]

Hi Eunseok,

what does it mean cup interrupt ?

Could you be more specific about the situation with UART ? This routine UART_IsChar() is only for checking if the receive buffer is full.

Regards,

Pavel

[eunseokjung]

I noticed that interrup is caused by this.

(tIsrFunc)&Cpu_Interrupt,          /* 0x03  0x0000000C   -1   ivINT_Hard_Fault               unused by PE */

How to solve this problem?

[pavel_krenek · Accepted solution]

Hi,

base address is OK. We do not use interrupt driven driver for the UART communication, it is not possible that the interrupt is generated cause the UART.

It looks like a written to some non enabled peripheral or register, pls. check SIM registers as Jorge mentioned in the previous reply.

Pavel

[Jorge_Gonzalez]

Hello Eunseok Jung:

Have you enabled the UART0 clock gate?

Any access to UART0 registers with clock gate disabled will generate a hardfault. Try adding this code at the beggining:

SIM_SCGC4 |= SIM_SCGC4_UART0_MASK;

Regards!

Jorge Gonzalez

[eunseokjung]

I found that MK10 UART0 base pointer is 0x4006A000.

That value is correct.

But it makes error.

Why it makes error?

[eunseokjung]

Hi, pavel.

I know what is the problem.

#define UART0_BASE_PTR                           ((UART_MemMapPtr)0x4006A000u)

When i run this command, the cpu goes to interrupt.

PE_ISR(Cpu_Interrupt)

{

   PE_DEBUGHALT();

}

I think, i use wrong UART BASE PTR.

My MCU is MK10DX256VLL7.

How to find correct address value?

Thx.

[eunseokjung]

Thanks pavel.

The cup is a typing error.

Thx.