68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
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/* (c) Daniele Lacamera 2019
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* GPL
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include "system.h"
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#include "button.h"
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#include "unicore-mx/stm32/gpio.h"
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#include "unicore-mx/stm32/exti.h"
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#include "unicore-mx/stm32/rcc.h"
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#include <unicore-mx/cm3/nvic.h>
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volatile int button_press_pending = 0;
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#define KEYA_PIN 13 // pc13
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#define KEYB_PIN 2 // pb2
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void button_setup(void)
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{
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int i;
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uint32_t exti_irq;
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rcc_periph_clock_enable(RCC_GPIOB);
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rcc_periph_clock_enable(RCC_GPIOC);
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rcc_periph_clock_enable(RCC_AFIO);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, KEYB_PIN);
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, KEYA_PIN);
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gpio_clear(GPIOB, KEYB_PIN);
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gpio_clear(GPIOC, KEYA_PIN);
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nvic_enable_irq(NVIC_EXTI15_10_IRQ);
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nvic_enable_irq(NVIC_EXTI2_IRQ);
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nvic_set_priority(NVIC_EXTI15_10_IRQ, 1);
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nvic_set_priority(NVIC_EXTI2_IRQ, 1);
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gpio_set_mode(GPIOC, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, KEYA_PIN);
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gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, KEYB_PIN);
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exti_select_source(KEYA_PIN, GPIOC);
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exti_select_source(KEYB_PIN, GPIOB);
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}
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void button_start_read(void)
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{
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exti_set_trigger(KEYA_PIN, EXTI_TRIGGER_FALLING);
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exti_set_trigger(KEYB_PIN, EXTI_TRIGGER_RISING);
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exti_enable_request(KEYA_PIN);
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}
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void isr_exti15_10(void)
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{
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exti_reset_request(KEYA_PIN);
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button_press_pending++;
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}
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void isr_exti2(void)
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{
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exti_reset_request(KEYB_PIN);
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button_press_pending++;
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}
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