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Question about bit-banding for Tiva M4 core

Robert

Hi,

I read example projects of Tiva-C 1294. There are many similar uses '    GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_2, GPIO_PIN_2);'

The prototype is :

extern void GPIOPinWrite(uint32_t ui32Port, uint8_t ui8Pins, uint8_t ui8Val);

The last parameter is a value, not a pin. I have asked the question on TI forum. I know that it is bit-banding, but that answer lacks detail on why it is bit-banding, it is set to '1' or clear to '0'?

Could you tell me more the line on GPIO_PIN_2?

Thanks,

void EK_TM4C1294XL_initWiFi(void)

{

    /* Configure EN & CS pins to disable CC3100 */

    GPIOPinTypeGPIOOutput(GPIO_PORTH_BASE, GPIO_PIN_2);

    GPIOPinTypeGPIOOutput(GPIO_PORTC_BASE, GPIO_PIN_6);

    GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_2, GPIO_PIN_2);

    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_6, 0);

Parents
  • +1

    Hello,

    I think the statements are not related with the bit-banding.

    I think they are just GPIO settings.

    I guess that GPIO_PIN_2 would be 0x4 (i.e. bit2 is 1).

    So,

     GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_2, GPIO_PIN_2);

    means set GPIOH[2] to '1'.

    Also,

    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_6, 0);

    means set GPIOC[6] to '0'.

    Best regards,

    Yasuhiko Koumoto.

Reply
  • +1

    Hello,

    I think the statements are not related with the bit-banding.

    I think they are just GPIO settings.

    I guess that GPIO_PIN_2 would be 0x4 (i.e. bit2 is 1).

    So,

     GPIOPinWrite(GPIO_PORTH_BASE, GPIO_PIN_2, GPIO_PIN_2);

    means set GPIOH[2] to '1'.

    Also,

    GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_6, 0);

    means set GPIOC[6] to '0'.

    Best regards,

    Yasuhiko Koumoto.

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