Posted on March 12, 2011 at 03:25i managed to switch the LEDs around and add more LEDs to the demo code provided for hte ST32vldiscovery, but i would like some help understanding how the user button and the NISV interrupts work. What i want to do is add another button such that if i press it the program counts down - so the User button increases the LED flash rate and hte new button will decrease that rate.
the new button is added to port A bit 2
the changes i have made so far compile with the following warnings:
..\..\..\Utilities\STM32vldiscovery.h(122): warning: &sharp47-D: incompatible redefinition of macro ''USER_BUTTON_PIN'' (declared at line 113)
..\..\..\Utilities\STM32vldiscovery.h(126): warning: &sharp47-D: incompatible redefinition of macro ''USER_BUTTON_EXTI_PIN_SOURCE'' (declared at line 117)
..\..\..\Utilities\STM32vldiscovery.h(127): warning: &sharp47-D: incompatible redefinition of macro ''USER_BUTTON_EXTI_LINE'' (declared at line 118)
..\..\..\Utilities\STM32vldiscovery.h(128): warning: &sharp47-D: incompatible redefinition of macro ''USER_BUTTON_EXTI_IRQn'' (declared at line 119)
the changes i have made to the stm32vldiscovery.h file are as follows.
typedef enum
{
BUTTON_USER = 0,
BUTTON_USER1 = 1, /*this is the new button name */
} Button_TypeDef;
/** @addtogroup STM32vldiscovery_LOW_LEVEL_BUTTON
* @{
*/
&sharpdefine BUTTONn 2 /* changed from 1 */
/* * @brief USER push-button
*/
&sharpdefine USER_BUTTON_PIN GPIO_Pin_0
&sharpdefine USER_BUTTON_GPIO_PORT GPIOA
&sharpdefine USER_BUTTON_GPIO_CLK RCC_APB2Periph_GPIOA
&sharpdefine USER_BUTTON_EXTI_PORT_SOURCE GPIO_PortSourceGPIOA
&sharpdefine USER_BUTTON_EXTI_PIN_SOURCE GPIO_PinSource0
&sharpdefine USER_BUTTON_EXTI_LINE EXTI_Line0
&sharpdefine USER_BUTTON_EXTI_IRQn EXTI0_IRQn
/* added by jase 5th March */
&sharpdefine USER_BUTTON_PIN GPIO_Pin_2
&sharpdefine USER_BUTTON_GPIO_PORT GPIOA
&sharpdefine USER_BUTTON_GPIO_CLK RCC_APB2Periph_GPIOA
&sharpdefine USER_BUTTON_EXTI_PORT_SOURCE GPIO_PortSourceGPIOA
&sharpdefine USER_BUTTON_EXTI_PIN_SOURCE GPIO_PinSource2
&sharpdefine USER_BUTTON_EXTI_LINE EXTI_Line2
&sharpdefine USER_BUTTON_EXTI_IRQn EXTI2_IRQn
from reading thru the code in the stm32vldiscovery.c file i dont think i need to add code to the pin configuration part because it takes in the definitions from the h file.
any help would be much appreciated
#external-interrupts-button
