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Add pin de-multiplexing to STM32 EXTI handling

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3753 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2011-07-08 12:46:56 +00:00
parent 2b55ba6628
commit ca05c9f1b4
1 changed files with 134 additions and 73 deletions

View File

@ -91,10 +91,7 @@ static const char g_portchar[8] =
};
#endif
static xcpt_t stm32_exti_callbacks[7] =
{
NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
static xcpt_t stm32_exti_callbacks[16];
/****************************************************************************
* Private Functions
@ -255,16 +252,20 @@ int stm32_gpio_configlock(uint32_t cfgset, bool altlock)
return OK;
}
/****************************************************************************
* Interrupt Service Routines - Dispatchers
****************************************************************************/
int stm32_exti0_isr(int irq, void *context)
static int stm32_exti0_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0001, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[0])
{
ret = stm32_exti_callbacks[0](irq, context);
@ -272,11 +273,16 @@ int stm32_exti0_isr(int irq, void *context)
return ret;
}
int stm32_exti1_isr(int irq, void *context)
static int stm32_exti1_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0002, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[1])
{
ret = stm32_exti_callbacks[1](irq, context);
@ -284,11 +290,16 @@ int stm32_exti1_isr(int irq, void *context)
return ret;
}
int stm32_exti2_isr(int irq, void *context)
static int stm32_exti2_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0004, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[2])
{
ret = stm32_exti_callbacks[2](irq, context);
@ -296,11 +307,16 @@ int stm32_exti2_isr(int irq, void *context)
return ret;
}
int stm32_exti3_isr(int irq, void *context)
static int stm32_exti3_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0008, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[3])
{
ret = stm32_exti_callbacks[3](irq, context);
@ -308,11 +324,16 @@ int stm32_exti3_isr(int irq, void *context)
return ret;
}
int stm32_exti4_isr(int irq, void *context)
static int stm32_exti4_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0010, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[4])
{
ret = stm32_exti_callbacks[4](irq, context);
@ -320,28 +341,52 @@ int stm32_exti4_isr(int irq, void *context)
return ret;
}
int stm32_exti95_isr(int irq, void *context)
static int stm32_exti_multiisr(int irq, void *context, int first, int last)
{
uint32_t pr;
int pin;
int ret = OK;
putreg32(0x03E0, STM32_EXTI_PR); /* ACK all pins, since we support just one */
if (stm32_exti_callbacks[5])
/* Examine the state of each pin in the group */
pr = getreg32(STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
for (pin = first; pin <= last; pin++)
{
ret = stm32_exti_callbacks[5](irq, context);
/* Is an interrupt pending on this pin? */
uint32_t mask = (1 << pin);
if ((pr & mask) != 0)
{
/* Clear the pending interrupt */
putreg32(mask, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[pin])
{
int tmp = stm32_exti_callbacks[pin](irq, context);
if (tmp != OK)
{
ret = tmp;
}
}
}
}
return ret;
}
int stm32_exti1510_isr(int irq, void *context)
static int stm32_exti95_isr(int irq, void *context)
{
int ret = OK;
return stm32_exti_multiisr(irq, context, 5, 9);
}
putreg32(0xFC00, STM32_EXTI_PR); /* ACK all pins, since we support just one */
if (stm32_exti_callbacks[6])
{
ret = stm32_exti_callbacks[6](irq, context);
}
return ret;
static int stm32_exti1510_isr(int irq, void *context)
{
return stm32_exti_multiisr(irq, context, 10, 15);
}
/****************************************************************************
@ -582,70 +627,86 @@ bool stm32_gpioread(uint32_t pinset)
xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
bool event, xcpt_t func)
{
uint32_t exti_isr = pinset & GPIO_PIN_MASK;
uint32_t exti_bit = STM32_EXTI_BIT( exti_isr );
int intno;
int (*exti_hnd)(int irq, void *context);
xcpt_t oldhandler = NULL;
uint32_t pin = pinset & GPIO_PIN_MASK;
uint32_t exti = STM32_EXTI_BIT(pin);
int irq;
xcpt_t handler;
xcpt_t oldhandler = NULL;
/* Set callback, single callback at the moment, but we could extend
* that easily
*/
/* Select the interrupt handler for this EXTI pin */
if (exti_isr < 5) {
intno = exti_isr + STM32_IRQ_EXTI0;
switch(exti_isr) {
case 0: exti_hnd = stm32_exti0_isr; break;
case 1: exti_hnd = stm32_exti1_isr; break;
case 2: exti_hnd = stm32_exti2_isr; break;
case 3: exti_hnd = stm32_exti3_isr; break;
default:exti_hnd = stm32_exti4_isr; break;
if (pin < 5)
{
irq = pin + STM32_IRQ_EXTI0;
switch (pin)
{
case 0:
handler = stm32_exti0_isr;
break;
case 1:
handler = stm32_exti1_isr;
break;
case 2:
handler = stm32_exti2_isr;
break;
case 3:
handler = stm32_exti3_isr;
break;
default:
handler = stm32_exti4_isr;
break;
}
}
else if (exti_isr < 10) {
exti_isr = 5;
exti_hnd = stm32_exti95_isr;
intno = STM32_IRQ_EXTI95;
else if (pin < 10)
{
irq = STM32_IRQ_EXTI95;
handler = stm32_exti95_isr;
}
else {
exti_isr = 6;
exti_hnd = stm32_exti1510_isr;
intno = STM32_IRQ_EXTI1510;
else
{
irq = STM32_IRQ_EXTI1510;
handler = stm32_exti1510_isr;
}
/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
oldhandler = stm32_exti_callbacks[exti_isr];
stm32_exti_callbacks[exti_isr] = func;
oldhandler = stm32_exti_callbacks[pin];
stm32_exti_callbacks[pin] = func;
/* Install external interrupt handlers */
/* Install external interrupt handlers */
if (func) {
irq_attach(intno, exti_hnd);
up_enable_irq(intno);
if (func)
{
irq_attach(irq, handler);
up_enable_irq(irq);
}
else
{
up_disable_irq(irq);
}
else up_disable_irq(intno);
/* Configure GPIO, enable EXTI line enabled if event or interrupt is enabled */
if (event || func)
pinset |= GPIO_EXTI;
stm32_configgpio( pinset );
/* Configure rising/falling edges */
modifyreg32(STM32_EXTI_RTSR, risingedge ? 0 : exti_bit, risingedge ? exti_bit : 0);
modifyreg32(STM32_EXTI_FTSR, fallingedge ? 0 : exti_bit, fallingedge ? exti_bit : 0);
/* Enable Events and Interrupts */
modifyreg32(STM32_EXTI_EMR, event ? 0 : exti_bit, event ? exti_bit : 0);
modifyreg32(STM32_EXTI_IMR, func ? 0 : exti_bit, func ? exti_bit : 0);
/* Return the old IRQ handler */
/* Configure GPIO, enable EXTI line enabled if event or interrupt is enabled */
if (event || func)
{
pinset |= GPIO_EXTI;
}
stm32_configgpio(pinset);
return oldhandler;
/* Configure rising/falling edges */
modifyreg32(STM32_EXTI_RTSR, risingedge ? 0 : exti, risingedge ? exti : 0);
modifyreg32(STM32_EXTI_FTSR, fallingedge ? 0 : exti, fallingedge ? exti : 0);
/* Enable Events and Interrupts */
modifyreg32(STM32_EXTI_EMR, event ? 0 : exti, event ? exti : 0);
modifyreg32(STM32_EXTI_IMR, func ? 0 : exti, func ? exti : 0);
/* Return the old IRQ handler */
return oldhandler;
}
/****************************************************************************