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Now stm32f4 external interrupt handler checks interrupt status before passing interrupt down.

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Without this check, I was seeing multiple interrupts when only 1 was expected.

I note that all examples on the internet that show how to use the external interrupts
do include the call to EXTI_GetITStatus() so I guess that is is required.
This commit is contained in:
Mark Burton 2018-09-18 11:40:56 +01:00
parent eea2cabd53
commit 6c14c84800
1 changed files with 12 additions and 9 deletions
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21
src/platform/stm32f4/platform_int.c
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@ -74,17 +74,20 @@ static int exint_gpio_to_src( pio_type piodata )
static void all_exti_irqhandler( int line )
{
u16 v, port, pin;
v = exti_line_to_gpio( line );
port = PLATFORM_IO_GET_PORT( v );
pin = PLATFORM_IO_GET_PIN( v );
if( EXTI->RTSR & (1 << line ) && platform_pio_op( port, 1 << pin, PLATFORM_IO_PIN_GET ) )
cmn_int_handler( INT_GPIO_POSEDGE, v );
if( EXTI->FTSR & (1 << line ) && ( platform_pio_op( port, 1 << pin, PLATFORM_IO_PIN_GET ) == 0 ) )
cmn_int_handler( INT_GPIO_NEGEDGE, v );
if( EXTI_GetITStatus( exti_line[ line ] ) == SET )
{
v = exti_line_to_gpio( line );
port = PLATFORM_IO_GET_PORT( v );
pin = PLATFORM_IO_GET_PIN( v );
EXTI_ClearITPendingBit( exti_line[ line ] );
if( EXTI->RTSR & (1 << line ) && platform_pio_op( port, 1 << pin, PLATFORM_IO_PIN_GET ) )
cmn_int_handler( INT_GPIO_POSEDGE, v );
if( EXTI->FTSR & (1 << line ) && ( platform_pio_op( port, 1 << pin, PLATFORM_IO_PIN_GET ) == 0 ) )
cmn_int_handler( INT_GPIO_NEGEDGE, v );
EXTI_ClearITPendingBit( exti_line[ line ] );
}
}
void EXTI0_IRQHandler()