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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-07-08 12:46:56 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-07-08 12:46:56 +0000 |
commit | 5711ff4501884ac98471edbbcf0585e7baa1c7f3 (patch) | |
tree | 93df58b98d67cba292c1a09682987794a4baaa6d /nuttx/arch/arm/src | |
parent | 7e820ce03b73b1fd1620c810afb2c9a3c8e3fda9 (diff) | |
download | px4-nuttx-5711ff4501884ac98471edbbcf0585e7baa1c7f3.tar.gz px4-nuttx-5711ff4501884ac98471edbbcf0585e7baa1c7f3.tar.bz2 px4-nuttx-5711ff4501884ac98471edbbcf0585e7baa1c7f3.zip |
Add pin de-multiplexing to STM32 EXTI handling
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3753 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src')
-rwxr-xr-x | nuttx/arch/arm/src/stm32/stm32_gpio.c | 205 |
1 files changed, 133 insertions, 72 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_gpio.c b/nuttx/arch/arm/src/stm32/stm32_gpio.c index 4169abf69..159f5d4f6 100755 --- a/nuttx/arch/arm/src/stm32/stm32_gpio.c +++ b/nuttx/arch/arm/src/stm32/stm32_gpio.c @@ -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(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 */ + else + { + up_disable_irq(irq); + } + + /* Configure GPIO, enable EXTI line enabled if event or interrupt is enabled */ - modifyreg32(STM32_EXTI_EMR, event ? 0 : exti_bit, event ? exti_bit : 0); - modifyreg32(STM32_EXTI_IMR, func ? 0 : exti_bit, func ? exti_bit : 0); + if (event || func) + { + pinset |= GPIO_EXTI; + } + + stm32_configgpio(pinset); + + /* 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 the old IRQ handler */ - return oldhandler; + return oldhandler; } /**************************************************************************** |