ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
mbed-os/targets/TARGET_STM/TARGET_STM32F0/gpio_irq_api.c

271 lines
8.5 KiB
C
Raw Blame History

/* mbed Microcontroller Library
*******************************************************************************
* Copyright (c) 2014, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************
*/
#include <stddef.h>
#include "cmsis.h"
#include "gpio_irq_api.h"
#include "pinmap.h"
#include "mbed_error.h"
#define EDGE_NONE (0)
#define EDGE_RISE (1)
#define EDGE_FALL (2)
#define EDGE_BOTH (3)
// Number of EXTI irq vectors (EXTI0_1, EXTI2_3, EXTI4_15)
#define CHANNEL_NUM (3)
// Max pins for one line (max with EXTI4_15)
#define MAX_PIN_LINE (12)
typedef struct gpio_channel {
uint32_t pin_mask; // bitmask representing which pins are configured for receiving interrupts
uint32_t channel_ids[MAX_PIN_LINE]; // mbed "gpio_irq_t gpio_irq" field of instance
uint32_t channel_gpio[MAX_PIN_LINE]; // base address of gpio port group
uint32_t channel_pin[MAX_PIN_LINE]; // pin number in port group
} gpio_channel_t;
static gpio_channel_t channels[CHANNEL_NUM] = {
{.pin_mask = 0},
{.pin_mask = 0},
{.pin_mask = 0}
};
// Used to return the index for channels array.
static uint32_t pin_base_nr[16] = {
// EXTI0_1
0, // pin 0
1, // pin 1
// EXTI2_3
0, // pin 2
1, // pin 3
// EXTI4_15
0, // pin 4
1, // pin 5
2, // pin 6
3, // pin 7
4, // pin 8
5, // pin 9
6, // pin 10
7, // pin 11
8, // pin 12
9, // pin 13
10, // pin 14
11 // pin 15
};
static gpio_irq_handler irq_handler;
static void handle_interrupt_in(uint32_t irq_index, uint32_t max_num_pin_line)
{
gpio_channel_t *gpio_channel = &channels[irq_index];
uint32_t gpio_idx;
for (gpio_idx = 0; gpio_idx < max_num_pin_line; gpio_idx++) {
uint32_t current_mask = (1 << gpio_idx);
if (gpio_channel->pin_mask & current_mask) {
// Retrieve the gpio and pin that generate the irq
GPIO_TypeDef *gpio = (GPIO_TypeDef *)(gpio_channel->channel_gpio[gpio_idx]);
uint32_t pin = (uint32_t)(1 << (gpio_channel->channel_pin[gpio_idx]));
// Clear interrupt flag
if (__HAL_GPIO_EXTI_GET_FLAG(pin) != RESET) {
__HAL_GPIO_EXTI_CLEAR_FLAG(pin);
if (gpio_channel->channel_ids[gpio_idx] == 0) continue;
// Check which edge has generated the irq
if ((gpio->IDR & pin) == 0) {
irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_FALL);
} else {
irq_handler(gpio_channel->channel_ids[gpio_idx], IRQ_RISE);
}
}
}
}
}
// EXTI lines 0 to 1
static void gpio_irq0(void)
{
handle_interrupt_in(0, 2);
}
// EXTI lines 2 to 3
static void gpio_irq1(void)
{
handle_interrupt_in(1, 2);
}
// EXTI lines 4 to 15
static void gpio_irq2(void)
{
handle_interrupt_in(2, 12);
}
extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
extern void pin_function_gpiomode(PinName pin, uint32_t gpiomode);
int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id)
{
IRQn_Type irq_n = (IRQn_Type)0;
uint32_t vector = 0;
uint32_t irq_index;
gpio_channel_t *gpio_channel;
uint32_t gpio_idx;
if (pin == NC) return -1;
uint32_t port_index = STM_PORT(pin);
uint32_t pin_index = STM_PIN(pin);
// Select irq number and interrupt routine
if ((pin_index == 0) || (pin_index == 1)) {
irq_n = EXTI0_1_IRQn;
vector = (uint32_t)&gpio_irq0;
irq_index = 0;
} else if ((pin_index == 2) || (pin_index == 3)) {
irq_n = EXTI2_3_IRQn;
vector = (uint32_t)&gpio_irq1;
irq_index = 1;
} else if ((pin_index > 3) && (pin_index < 16)) {
irq_n = EXTI4_15_IRQn;
vector = (uint32_t)&gpio_irq2;
irq_index = 2;
} else {
error("InterruptIn error: pin not supported.\n");
return -1;
}
// Enable GPIO clock
uint32_t gpio_add = Set_GPIO_Clock(port_index);
// Configure GPIO
pin_function(pin, STM_PIN_DATA(STM_MODE_IT_FALLING, GPIO_NOPULL, 0));
// Enable EXTI interrupt
NVIC_SetVector(irq_n, vector);
NVIC_EnableIRQ(irq_n);
// Save informations for future use
obj->irq_n = irq_n;
obj->irq_index = irq_index;
obj->event = EDGE_NONE;
obj->pin = pin;
gpio_channel = &channels[irq_index];
gpio_idx = pin_base_nr[pin_index];
gpio_channel->pin_mask |= (1 << gpio_idx);
gpio_channel->channel_ids[gpio_idx] = id;
gpio_channel->channel_gpio[gpio_idx] = gpio_add;
gpio_channel->channel_pin[gpio_idx] = pin_index;
irq_handler = handler;
return 0;
}
void gpio_irq_free(gpio_irq_t *obj)
{
gpio_channel_t *gpio_channel = &channels[obj->irq_index];
uint32_t pin_index = STM_PIN(obj->pin);
uint32_t gpio_addr = GPIOA_BASE + (GPIOB_BASE-GPIOA_BASE) * STM_PORT(obj->pin);
uint32_t gpio_idx = pin_base_nr[pin_index];
HAL_GPIO_DeInit((GPIO_TypeDef *)gpio_addr, (1<<pin_index));
gpio_channel->pin_mask &= ~(1 << gpio_idx);
gpio_channel->channel_ids[gpio_idx] = 0;
gpio_channel->channel_gpio[gpio_idx] = 0;
gpio_channel->channel_pin[gpio_idx] = 0;
// Disable EXTI line, but don't change pull-up config
pin_function_gpiomode(obj->pin, STM_MODE_INPUT);
obj->event = EDGE_NONE;
}
void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable)
{
uint32_t mode = STM_MODE_IT_EVT_RESET;
uint32_t pull = GPIO_NOPULL;
if (enable) {
if (event == IRQ_RISE) {
if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mode = STM_MODE_IT_RISING_FALLING;
obj->event = EDGE_BOTH;
} else { // NONE or RISE
mode = STM_MODE_IT_RISING;
obj->event = EDGE_RISE;
}
}
if (event == IRQ_FALL) {
if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mode = STM_MODE_IT_RISING_FALLING;
obj->event = EDGE_BOTH;
} else { // NONE or FALL
mode = STM_MODE_IT_FALLING;
obj->event = EDGE_FALL;
}
}
} else { // Disable
if (event == IRQ_RISE) {
if ((obj->event == EDGE_FALL) || (obj->event == EDGE_BOTH)) {
mode = STM_MODE_IT_FALLING;
obj->event = EDGE_FALL;
} else { // NONE or RISE
mode = STM_MODE_IT_EVT_RESET;
obj->event = EDGE_NONE;
}
}
if (event == IRQ_FALL) {
if ((obj->event == EDGE_RISE) || (obj->event == EDGE_BOTH)) {
mode = STM_MODE_IT_RISING;
obj->event = EDGE_RISE;
} else { // NONE or FALL
mode = STM_MODE_IT_EVT_RESET;
obj->event = EDGE_NONE;
}
}
}
pin_function_gpiomode(obj->pin, mode);
}
void gpio_irq_enable(gpio_irq_t *obj)
{
NVIC_EnableIRQ(obj->irq_n);
}
void gpio_irq_disable(gpio_irq_t *obj)
{
NVIC_DisableIRQ(obj->irq_n);
obj->event = EDGE_NONE;
}
Reference in New Issue View Git Blame Copy Permalink