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stm32/extint: Add extint_set() function for internal C access to EXTI.

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Damien George 2019-06-01 16:08:11 +10:00
parent 345e9864aa
commit 10e173aaea
1 changed files with 50 additions and 0 deletions
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50
ports/stm32/extint.c
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@ -297,6 +297,53 @@ void extint_register_pin(const pin_obj_t *pin, uint32_t mode, bool hard_irq, mp_
} }
} }
void extint_set(const pin_obj_t *pin, uint32_t mode) {
uint32_t line = pin->pin;
mp_obj_t *cb = &MP_STATE_PORT(pyb_extint_callback)[line];
extint_disable(line);
*cb = MP_OBJ_SENTINEL;
pyb_extint_mode[line] = (mode & 0x00010000) ? // GPIO_MODE_IT == 0x00010000
EXTI_Mode_Interrupt : EXTI_Mode_Event;
{
// Configure and enable the callback
pyb_extint_hard_irq[line] = 1;
pyb_extint_callback_arg[line] = MP_OBJ_FROM_PTR(pin);
// Route the GPIO to EXTI
__HAL_RCC_SYSCFG_CLK_ENABLE();
SYSCFG->EXTICR[line >> 2] =
(SYSCFG->EXTICR[line >> 2] & ~(0x0f << (4 * (line & 0x03))))
| ((uint32_t)(GPIO_GET_INDEX(pin->gpio)) << (4 * (line & 0x03)));
// Enable or disable the rising detector
if ((mode & GPIO_MODE_IT_RISING) == GPIO_MODE_IT_RISING) {
EXTI_RTSR |= 1 << line;
} else {
EXTI_RTSR &= ~(1 << line);
}
// Enable or disable the falling detector
if ((mode & GPIO_MODE_IT_FALLING) == GPIO_MODE_IT_FALLING) {
EXTI_FTSR |= 1 << line;
} else {
EXTI_FTSR &= ~(1 << line);
}
// Configure the NVIC
NVIC_SetPriority(IRQn_NONNEG(nvic_irq_channel[line]), IRQ_PRI_EXTINT);
HAL_NVIC_EnableIRQ(nvic_irq_channel[line]);
// Enable the interrupt
extint_enable(line);
}
}
void extint_enable(uint line) { void extint_enable(uint line) {
if (line >= EXTI_NUM_VECTORS) { if (line >= EXTI_NUM_VECTORS) {
return; return;
@ -552,6 +599,9 @@ const mp_obj_type_t extint_type = {
void extint_init0(void) { void extint_init0(void) {
for (int i = 0; i < PYB_EXTI_NUM_VECTORS; i++) { for (int i = 0; i < PYB_EXTI_NUM_VECTORS; i++) {
if (MP_STATE_PORT(pyb_extint_callback)[i] == MP_OBJ_SENTINEL) {
continue;
}
MP_STATE_PORT(pyb_extint_callback)[i] = mp_const_none; MP_STATE_PORT(pyb_extint_callback)[i] = mp_const_none;
pyb_extint_mode[i] = EXTI_Mode_Interrupt; pyb_extint_mode[i] = EXTI_Mode_Interrupt;
} }