Getting userinput in STM32F4Discovery using ChibiOS RTOS

To get user input in STM32F4Discovery..chnage directory to the concerned folder

cd ChibiOS_2.4.1/demos/ARMCM4-STM32F407-DISCOVERY/

edit the main.c file and insert this code

#include "ch.h"
#include "hal.h"

int main(void) {

halInit();
chSysInit();

palSetPadMode(GPIOD,4, PAL_MODE_INPUT);
palSetPadMode(GPIOD,6, PAL_MODE_OUTPUT_PUSHPULL);

while (TRUE) {
int x;
x=palReadPad(GPIOD,4);
if (x){
palSetPad(GPIOD, 6);
}
else{
palClearPad(GPIOD, 6);
}

}
}

Here GPIOD pin4 is set as input and pin6 is set as output….I connected a button to 5v and the out of the button is connected to  pin4 which is set as input whenever i press the button pin4 becomes high and whenever pin4 becomes high pin6 becomes high an led is connected to pin6 to know the user button action…

to generate binary

cd ChibiOS_2.4.1/demos/ARMCM4-STM32F407-DISCOVERY/

make

st-flash write build/ch.bin 0x08000000

Happy Hacking 🙂

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STM32F4Discovery GPIO Programming using ChibiOS RTOS

To use the gpio pins…

cd ChibiOS_2.4.1/demos/ARMCM4-STM32F407-DISCOVERY/

Similar to the earlier method edit the main.c file and insert this code

#include "ch.h"
#include "hal.h"
int main(void) {
halInit();
chSysInit();
palSetPadMode(GPIOD, 4, PAL_MODE_OUTPUT_PUSHPULL); /* PD4 */
while (TRUE) {
palSetPad(GPIOD, 4);
chThdSleepMilliseconds(500);
palClearPad(GPIOD, 4);
chThdSleepMilliseconds(500);
}
}

The palSetPadMode configures PD4 or GPIOD’s fourth pin as output..now connect an led to the PD4 and see output

Now repeat the older steps to generate binary

cd ChibiOS_2.4.1/demos/ARMCM4-STM32F407-DISCOVERY/

make

st-flash write build/ch.bin 0x08000000

Happy Hacking 🙂

Getting started with STM32F4Discovery and ChibiOS

ChibiOS is a portable,open source RTOS…ChibiOS can be downloaded from source forge

http://sourceforge.net/projects/chibios/

Extract the downloaded file..Inside the folder you can see a folder named Demos inside that our board will be listed ARMCM4-STM32F407-DISCOVERY inside that folder there will be a main.c….Edit that main.c file

#include "ch.h"
#include "hal.h"

int main(void) {

halInit();
chSysInit();

palSetPadMode(GPIOD, GPIOD_LED4, PAL_MODE_OUTPUT_PUSHPULL); /* Green. */

while (TRUE) {
palSetPad(GPIOD, GPIOD_LED4);
chThdSleepMilliseconds(500);
palClearPad(GPIOD, GPIOD_LED4);
chThdSleepMilliseconds(500);
}
}

palSetPadMode configure the I/O as input or output….palSetPad and  palClearPad is similar to High and Low…halinit is the intialization of hardware abstraction layer and chsysinit is the intialization of kernel…

Open a terminal and change directory to that folder

cd ChibiOS_2.4.1/demos/ARMCM4-STM32F407-DISCOVERY/

make

st-flash write build/ch.bin 0x08000000

Happy Hacking 🙂