Read state of pin STM32

[zizou_zaydoun1988]

Posted on May 11, 2012 at 15:28

HELLO,

I use

The

STM32L152RBT6

.

I want to know

how I can

read

the logic state

of a pine tree

if it is

up or down

and display it on

LCD. 

#!rocketscience

[esiqueira]

Posted on May 11, 2012 at 15:53

/* Reads the pin(3) of the GPIOA and store it in ReadValue variable */

u8 ReadValue;

ReadValue = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3);

[esiqueira]

Posted on May 11, 2012 at 15:54

if (

GPIO_ReadInputDataBit(GPIOA

,

GPIO_Pin_3)==0)

{

    [...code...]

}

LCD SPI?

[Tesla DeLorean]

Posted on May 11, 2012 at 16:21

LCD SPI?

Probably not, the STM32L152 can drive the simple glass on it's own.

Not sure how the pine tree works, spruce or douglas?

[zizou_zaydoun1988]

Posted on May 11, 2012 at 16:26

thank you very much

,

but

is it possible

to give me

the instruction to

display the status

of

pine

on the display

LCD

STM32

board

after

reading it

and

thank you in advance

[esiqueira]

Posted on May 11, 2012 at 16:32

Sorry,

Is this board???

• STM32L152RBT6 microcontroller featuring 128 KB Flash, 16 KB RAM, 4 KB EEPROM, in an LQFP64 package

• On-board ST-Link/V2 with selection mode switch to use the kit as a standalone ST-Link/V2 (with SWD connector for programming and debugging)

• Board power supply: through USB bus or from an external 3.3 or 5 V supply voltage

• External application power supply: 3 V and 5 V

• IDD current measurement

• LCD

  • DIP28 package

  • 24 segments, 4 commons

• Four LEDs:

  • LD1 (red/green) for USB communication

  • LD2 (red) for 3.3 V power on

  • Two user LEDs, LD3 (green) and LD4 (blue)

• Two pushbuttons (user and reset)

• One linear touch sensor or four touchkeys

• Extension header for LQFP64 I/Os for quick connection to prototyping board and easy probing

http://www.st.com/internet/evalboard/product/250990.jsp

From: ayari.zied

Posted: Friday, May 11, 2012 4:26 PM

Subject: Read state of pin STM32

thank you very much

,

but

is it possible

to give me

the instruction to

display the status

of

pine

on the display

LCD

STM32

board

after

reading it

and

thank you in advance

[zizou_zaydoun1988]

Posted on May 11, 2012 at 16:46

yes it is

the same card

as mine

, so

is

that

you can help me

?

[esiqueira]

Posted on May 11, 2012 at 18:29

I think you need reference the library: stm32l_discovery_lcd

Then use this function to display message at LCD

/* Display Welcome message */

LCD_GLASS_ScrollSentence('' **PIN 3 ACTIVE**'',1,SCROLL_SPEED);

This funcion can be found at: stm32l_discovery_lcd.c

/**

* @brief This function writes a char in the LCD RAM.

* @param ptr: Pointer to string to display on the LCD Glass.

* @retval None

* @par Required preconditions: Char is ASCCI value ''Ored'' with decimal point or Column flag

*/

void LCD_GLASS_DisplayStrDeci(uint16_t* ptr)

{

uint8_t i = 0x01;

uint8_t char_tmp;

// LCD_GLASS_Clear();

/* Send the string character by character on lCD */

while ((*ptr != 0) & (i < 8))

{

char_tmp = (*ptr) & 0x00ff;

switch ((*ptr) & 0xf000)

{

case DOT:

/* Display one character on LCD with decimal point */

LCD_GLASS_WriteChar(&char_tmp, POINT_ON, COLUMN_OFF, i);

break;

case DOUBLE_DOT:

/* Display one character on LCD with decimal point */

LCD_GLASS_WriteChar(&char_tmp, POINT_OFF, COLUMN_ON, i);

break;

default:

LCD_GLASS_WriteChar(&char_tmp, POINT_OFF, COLUMN_OFF, i);

break;

}

/* Point on the next character */

ptr++;

/* Increment the character counter */

i++;

}

}

________________

Attachments :

stm32l_discovery_lcd.c : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HtDW&d=%2Fa%2F0X0000000aKO%2FFhSOtSxvdFAq6DUKhYrE6hnMtwnlFnyWftoSsjUTpB8&asPdf=false

stm32l_discovery_lcd.h : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HtVt&d=%2Fa%2F0X0000000aR6%2FUs8_tSilfLoz7gyKUumW5SKx._7_RWoGFoSo66gJn3Q&asPdf=false

[zizou_zaydoun1988]

Posted on May 14, 2012 at 10:53

Again, thank you

,

but I want

the instruction that

allows me to send

the logic state of 

pin

PA3 for

example

to

LCD

[Tesla DeLorean]

Posted on May 14, 2012 at 19:48

Again, thank you

,

but I want

the instruction that

allows me to send

the logic state of

pin

PA3 for

example

to

LCD

if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3)==0)
LCD_GLASS_DisplayString(''PA3 LOW'');
else
LCD_GLASS_DisplayString(''PA3 HIGH'');

Perhaps you need to review some of the example code for the STM32L Discovery board and get more familiar with programming

[zizou_zaydoun1988]

Posted on May 15, 2012 at 10:50

I tried

to

connect the

PA3

pin

to pin

VDD and

sometimes

PIN 

3V

 

but

LCD

still

 

displays

''LOW''

, I

do not know why

:

(