Boot loader for LM4F series on UART1

Hi,

UART0 is enabled by default after reset, while UART1 is not. Try to enable it first; also take care how you define the pins.

Petrei

Hi I am using UART1 with PB0 and PB1 as RX and TX pins

following are the init and usage functions, please help me in verifying these.

Crystal init

    //     // Since the crystal frequency was specified, enable the main oscillator     // and clock the processor from it.     //     HWREG(SYSCTL_RCC) &= ~(SYSCTL_RCC_MOSCDIS);     Delay(524288);     HWREG(SYSCTL_RCC) = ((HWREG(SYSCTL_RCC) & ~(SYSCTL_RCC_OSCSRC_M)) |                          SYSCTL_RCC_OSCSRC_MAIN);

    //     // Set the flash programming time based on the specified crystal frequency.     //     HWREG(FLASH_USECRL) = ((CRYSTAL_FREQ + 999999) / 1000000) - 1;

UART1 init

    HWREG(SYSCTL_RCGC2) |= SYSCTL_RCGC2_GPIOB;        HWREG(SYSCTL_RCGC1) |= SYSCTL_RCGC1_UART1;

    //     // Set GPIO B0 and B1 as UART pins.     //     HWREG(GPIO_PORTB_BASE + GPIO_O_AFSEL) |= UART_PINS;     ROM_GPIOPinTypeUART(GPIO_PORTB_BASE, UART_PINS);// GPIO_PIN_0 | GPIO_PIN_1);

    //     // Set the pin type.     //     HWREG(GPIO_PORTB_BASE + GPIO_O_DEN) |= UART_PINS;

    //     // Set the baud rate.     //

    HWREG(UART1_BASE + UART_O_IBRD) = ulProcRatio >> 6;     HWREG(UART1_BASE + UART_O_FBRD) = ulProcRatio & UART_FBRD_DIVFRAC_M;

    //     // Set data length, parity, and number of stop bits to 8-N-1.     //     HWREG(UART1_BASE + UART_O_LCRH) = UART_LCRH_WLEN_8 | UART_LCRH_FEN;

    //     // Enable RX, TX, and the UART.     //     HWREG(UART1_BASE + UART_O_CTL) = (UART_CTL_UARTEN | UART_CTL_TXE |                                       UART_CTL_RXE);

in Updater function

                HWREG(SYSCTL_RCGC1) &= ~SYSCTL_RCGC1_UART1;                 HWREG(SYSCTL_SRCR1) = SYSCTL_SRCR1_UART1;

in UARTReceive function

        while((HWREG(UART1_BASE + UART_O_FR) & UART_FR_RXFE))  { }

        *pucData++ = HWREG(UART1_BASE + UART_O_DR);

in UARTSend Function

        while((HWREG(UART1_BASE + UART_O_FR) & UART_FR_TXFF)) #endif         {         }

        HWREG(UART1_BASE + UART_O_DR) = *pucData++;

in Flush function

    while(!(HWREG(UART1_BASE + UART_O_FR) & UART_FR_TXFE))     {     }

    //     // Wait for the FIFO to not be busy so that the shifter completes.     //

    while((HWREG(UART1_BASE + UART_O_FR) & UART_FR_BUSY))

    {     }

Regards

Paddy

Perhaps some/any answering response to detailed, prior post was, "too much to expect."  Absence of such feedback - and always vague, "did not work" (initial post's "crafting") are not especially compelling to even dedicated, remote "helpers."

Situation is then compounded by your exclusive use of direct Register transactions.  (which fly in the face of far simpler, exhaustively known & test/verified StellarisWare functions - suggested earlier)

Always painful to see "over-complication" - with zero support/justification - followed by the all too predictable, "did not work!" 

Sorry,

I have been trying this from past 15 days, I tried all the ways, and most pain full thing is I am unable to put breakpoints any where in code, dont know reason exactly why,

Editor is taking breakpoints but non of them are working real.  its not stopping at any place.

I am totally confused of code's behaviour, UART0 working fine, I have done conditional compilinng for both UART0 and 1 selectable,

UART0 works fine, but to analyze that, again Breakpoints not working.

I am testing this on Stellaris Launch Pad.

Please help if possible,

Let me know if any more information required / code required.

regards

Paddy

My friend - no one wants your sorrow - we wish only for your/others success. 

By straying far from StellarisWare (which makes most minimal use of ASM or Direct Register) you flee from Safe Harbor - often into rough, uncharted seas - never good!

Your initial post strongly suggested that a simple, missed initialization was sole culprit.  But now - plot has really thickened - likely extends to your IDE and much of your set-up and installation. 

Vendor experts are available to assist in these areas - you will benefit from a good read of, "Sticky post - detailing "How to ask a question?"  I'd switch to fresh post - focus on getting your IDE to work properly...

UART1 is merely "tip of  iceberg" - and this reporter barely able to captain aged sloop - confined to warmer, more hospital So. Cal. seas...

Hi

I am unable to get breakpoints work for this application only,

Rest other applications like usb/uart/any such able to use break points,

may be they disabled breakpoints for this, or I am doing wrong.

I am able to run application of UART1 echo program/command line program using stellaris libraries, so hope hardware of mine is fine

ny how let me try again... :-)

Thanks for your suggestions,

Regards

Paddy

Tried some more, and compared both UART0 and UART1 configurations,

Please help in finding my mistake... 

I am getting doubt that, is it possible any other UART than UART0?

Any TI apps comment?

Thanks a lot,

Problem got resolved, there was some multiple problems of clock setting and UART init,

Now I am able to use boot loader through UART1, and I can configure now to any other UART,

Thanks a lot for support,

Regards

Paddy

Hi Paddy,

    I have read carefully of your email. And I'm afraid I have met the same issue w/ you and can not work it out. I also use LM4F232 EVM board.

    Coud you pls share detailed info where you changed in the code to get UART1 boot loader run? Or can you share your source code with me? I have worked it for several days but no progress.......

    Hope you can see this message......

Regards,

Holly