LPC1769 peripherals (GPIO) do not answer

[cone_2]

Hi,

I am using this board: LPCXpresso board for LPC1769 with CMSIS DAP probe | NXP

and MCUXpresso. Currently I try to let the LED blink. I can connect with the board and debugging, but nothing happens, even when ein use the "Board_LED_Set" funktion. MCUXpresso and the Debugger are showing, that values in the GPIO Registers are changed. Anyone a suggestion?

Best Regards

Michael

[cone_2]

Hello xiangjun.rong

I allready tried to activate just pin 22 port 0, but it did not work. Your code is working, but when I remove this part from the while-loop-body:

LPC_GPIO[0].SET  |= 1<<22;
delay();
LPC_GPIO[0].CLR |= 1<<22;
delay();

The LED is not set on, but this code part, bevor the while-loop should do this:

LPC_GPIO[0].MASK = 0x00000000;
LPC_GPIO[0].DIR  |= 1<<22;
LPC_GPIO[0].SET  = 1<<22;

Any ideas why the LED is not set on for once and keeps on?

[xiangjun_rong]

Hi, Ben,

for the following code:

    while(1) {

    LPC_GPIO[0].SET  = 1<<22;

delay();

//LPC_GPIO[0].CLR = 1<<22;

delay();
        i++ ;
    }

If you comment one   LPC_GPIO[0].SET  = 1<<22; or LPC_GPIO[0].CLR = 1<<22;, the LED will keep ONE state for example on or off forever.

BR

XiangJun Rong

[cone_2]

Year of course, but why did this not work out of the while-loop:

LPC_GPIO[0].SET  = 1<<22;

?

[xiangjun_rong]

Hi, Michael,

I think it is okay to put the line LPC_GPIO[0].SET  = 1<<22; out of while loop, after the line is executed, the GPIO pin will be high. You can set a break point, and run the line step by step.

BR

XiangJun Rong

[cone_2]

Yeah, I did this, but it did not work and I do not understand why.

I put this Line:

LPC_GPIO[0].SET  = 1<<22;

out of the while-loop but the LED did not start to glow, nothing happens. Why?

[xiangjun_rong]

Hi,

whether you can glow a LED is dependent on the hardware connection,

how about using the line to glow a LED:

LPC_GPIO[0].CLR  = 1<<22;

BR

Xiangjun Rong

[cone_2]

Thank you very much, that did the job!

[Alice_Yang]

Hello Michael Petersen,

You can first try the demo "periph_blinky" under LPCopen, I have test it on my side ,it can work well.

Then compare the configuration with yours.

LPCOpen Software for LPC17XX | NXP 

Hope it helps,

Have a great day,
TIC

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[xiangjun_rong]

Hi, Michael,

From your following code, it appears that the LED is connected to P0_22(GPIO0_22), if it is the case, pls use the code.

anyway, pls check which pin is connected to LED.

BR

XiangJun Rong

int main(void) {

#if defined (__USE_LPCOPEN)
    // Read clock settings and update SystemCoreClock variable
    SystemCoreClockUpdate();
#if !defined(NO_BOARD_LIB)
    // Set up and initialize all required blocks and
    // functions related to the board hardware
    Board_Init();
    // Set the LED to the state of "On"
    Board_LED_Set(0, true);
#endif
#endif

    // Chip_GPIO_WriteDirBit(LPC_GPIO, 3, 26, true);
    // Chip_GPIO_WritePortBit(LPC_GPIO, 3, 26, true);

    LPC_IOCON->PINSEL[1] &= !(1 << 12);
    LPC_IOCON->PINSEL[1] &= !(1 << 13);
    LPC_IOCON->PINMODE[1] &= !(1 << 12);
    LPC_IOCON->PINMODE[1] &= !(1 << 13);

    LPC_GPIO[0].MASK = 0x00000000;
    LPC_GPIO[0].DIR  |= 1<<22;
    LPC_GPIO[0].SET  = 1<<22;

  //  LPC_GPIO[3].MASK = 0x00000000;
  //  LPC_GPIO[3].DIR  = 0xFFFFFFFF;
   // LPC_GPIO[3].SET  = 0xFFFFFFFF;

    volatile uint32_t check = LPC_GPIO[0].PIN & 0x00400000;

    // Force the counter to be placed into memory
    volatile static int i = 0 ;
    // Enter an infinite loop, just incrementing a counter
    while(1) {

    LPC_GPIO[0].SET  = 1<<22;

delay();

LPC_GPIO[0].CLR = 1<<22;

delay();
        i++ ;
    }
    return 0 ;
}

void delay(void)

{

unsigned int j;

j=0;

for(unsigned int i=0; i<100000;i++)

{

j++;

}

}