Standard library

[chriscommunist]

Posted on December 01, 2009 at 13:07

Standard library

[chriscommunist]

Posted on May 17, 2011 at 15:06

Code:

BitStatus bitstatus = GPIO_ReadInputPin(GPIOD, GPIO_PIN_0);

This will return RESET or SET, which are HIGH and LOW values.

Code:

GPIO_DeInit(GPIOD);

GPIO_Init(GPIOD, GPIO_PIN_0, GPIO_MODE_OUT_PP_LOW_FAST);

GPIO_Write(GPIOD, (u8) !bitstatus);

How do I write it back to the _SAME_ pin? I'm not sure what this is doing, but if I attach another LED to GPIOD pin 1, will that second LED have the same action as PIN 0?

What is the correct way to write a variable to a _single_ pin?

Thanks.

(I'm with the discovery, btw)

[mozra27]

Posted on May 17, 2011 at 15:06

if I understand you need to toggle the GPIOD pin 1 so you can use directly

GPIO_WriteReverse(GPIOD, GPIO_PIN_0);

instead of:

BitStatus bitstatus = GPIO_ReadInputPin(GPIOD, GPIO_PIN_0);

GPIO_Write(GPIOD, (u8) !bitstatus);

when bitstatus is reset ==> !bitstatus = 0xFF so you write in all GPIOD pins

You can use this function that give you the possibility to write only in the needed pins:

void GPIO_WriteBit(GPIO_TypeDef* GPIOx, GPIO_Pin_TypeDef GPIO_Pin, BitAction GPIO_BitVal)

{

/* Check the parameters */

assert_param(IS_GPIO_PIN_OK(GPIO_Pin));

assert_param(IS_STATE_VALUE_OK(GPIO_BitVal));

if (GPIO_BitVal != RESET)

{

SetBit(GPIOx->ODR, GPIO_Pin);

}

else

{

ClrBit(GPIOx->ODR, GPIO_Pin);

}

}

GPIO_WriteBit(GPIOD, GPIO_PIN_0, (u8)!bitstatus);

Regards

mozra

[chriscommunist]

Posted on May 17, 2011 at 15:06

[chriscommunist]

Posted on May 17, 2011 at 15:06

Quote:

On 01-12-2009 at 15:58, Anonymous wrote:

if I understand you need to toggle the GPIOD pin 1 so you can use directly

GPIO_WriteReverse(GPIOD, GPIO_PIN_0);

instead of:

BitStatus bitstatus = GPIO_ReadInputPin(GPIOD, GPIO_PIN_0);

GPIO_Write(GPIOD, (u8) !bitstatus);

when bitstatus is reset ==> !bitstatus = 0xFF so you write in all GPIOD pins

You can use this function that give you the possibility to write only in the needed pins:

void GPIO_WriteBit(GPIO_TypeDef* GPIOx, GPIO_Pin_TypeDef GPIO_Pin, BitAction GPIO_BitVal)

{

/* Check the parameters */

assert_param(IS_GPIO_PIN_OK(GPIO_Pin));

assert_param(IS_STATE_VALUE_OK(GPIO_BitVal));

if (GPIO_BitVal != RESET)

{

SetBit(GPIOx->ODR, GPIO_Pin);

}

else

{

ClrBit(GPIOx->ODR, GPIO_Pin);

}

}

GPIO_WriteBit(GPIOD, GPIO_PIN_0, (u8)!bitstatus);

Regards

mozra

I have tried this code but I'm getting an error, ''Invalid parameter declaration''.

Quote:

On 01-12-2009 at 17:32, Anonymous wrote:

Hello,

in case you don't use the libraries, the syntax is even more simple:

Code:

<BR>volatile char PD_ODR @0x500f; /* Data Output Latch reg */

<BR>volatile _Bool PD1 @PD_ODR:1;

<BR>void testDP1(void)

<BR> {

<BR> PD1 = 1; // set bit

<BR> PD1 = 0; // reset bit

<BR> if (PD1) // test for 1

<BR> PD1 = 0;

<BR> if (!PD1) // test for 0

<BR> PD1 = 1;

<BR> PD1 ^= 1; // complement

<BR> }

<BR>

and the code generated probably more straighforward (but I haven't checked; maybe if someone posts the code generated for the library calls we can compare).

Regards,

Luca

[ This message was edited by: _luca on 01-12-2009 17:33 ]

Thanks.

[luca239955_st]

Posted on May 17, 2011 at 15:06

Hello,

in case you don't use the libraries, the syntax is even more simple:

Code:

<BR>volatile char PD_ODR @0x500f; /* Data Output Latch reg */ <BR>volatile _Bool PD1 @PD_ODR:1; <BR>void testDP1(void) <BR> { <BR> PD1 = 1; // set bit <BR> PD1 = 0; // reset bit <BR> if (PD1) // test for 1 <BR> PD1 = 0; <BR> if (!PD1) // test for 0 <BR> PD1 = 1; <BR> PD1 ^= 1; // complement <BR> } <BR>

and the code generated probably more straighforward (but I haven't checked; maybe if someone posts the code generated for the library calls we can compare).

Regards,

Luca

[ This message was edited by: _luca on 01-12-2009 17:33 ]