70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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#include <stm_misc.h>
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#include <stm32f4xx_gpio.h>
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#include <stm32f4xx_exti.h>
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#include <stm32f4xx_syscfg.h>
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#include <stm32f4xx_rcc.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "obj.h"
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#include "usrsw.h"
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#define PYB_USRSW_PORT (GPIOA)
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#define PYB_USRSW_PIN (GPIO_Pin_13)
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void sw_init(void) {
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// make it an input with pull-up
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = PYB_USRSW_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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GPIO_Init(PYB_USRSW_PORT, &GPIO_InitStructure);
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// the rest does the EXTI interrupt
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/* Enable SYSCFG clock */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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/* Connect EXTI Line13 to PA13 pin */
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SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource13);
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/* Configure EXTI Line13, rising edge */
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EXTI_InitTypeDef EXTI_InitStructure;
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EXTI_InitStructure.EXTI_Line = EXTI_Line13;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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/* Enable and set EXTI15_10 Interrupt to the lowest priority */
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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int sw_get(void) {
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if (PYB_USRSW_PORT->IDR & PYB_USRSW_PIN) {
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// pulled high, so switch is not pressed
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return 0;
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} else {
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// pulled low, so switch is pressed
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return 1;
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}
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}
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/******************************************************************************/
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/* Micro Python bindings */
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mp_obj_t pyb_sw(void) {
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if (sw_get()) {
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return mp_const_true;
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} else {
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return mp_const_false;
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}
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}
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