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https://github.com/trezor/trezor-firmware.git
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41 lines
1014 B
C
41 lines
1014 B
C
#include STM32_HAL_H
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#include "button.h"
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#define BTN_PIN_LEFT GPIO_PIN_5
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#define BTN_PIN_RIGHT GPIO_PIN_2
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void button_init(void) {
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__HAL_RCC_GPIOC_CLK_ENABLE();
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Mode = GPIO_MODE_INPUT;
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GPIO_InitStructure.Pull = GPIO_PULLUP;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
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GPIO_InitStructure.Pin = BTN_PIN_LEFT | BTN_PIN_RIGHT;
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HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
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}
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uint32_t button_read(void) {
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static char last_left = 0, last_right = 0;
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char left = (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_LEFT));
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char right = (GPIO_PIN_RESET == HAL_GPIO_ReadPin(GPIOC, BTN_PIN_RIGHT));
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if (last_left != left) {
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last_left = left;
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if (left) {
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return BTN_EVT_DOWN | BTN_LEFT;
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} else {
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return BTN_EVT_UP | BTN_LEFT;
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}
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}
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if (last_right != right) {
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last_right = right;
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if (right) {
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return BTN_EVT_DOWN | BTN_RIGHT;
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} else {
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return BTN_EVT_UP | BTN_RIGHT;
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}
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}
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return 0;
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}
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