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115 lines
3.3 KiB
115 lines
3.3 KiB
/* |
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* ackbtn-stm32f103.c - Acknowledge button support for STM32F103 |
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* |
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* Copyright (C) 2018 g10 Code GmbH |
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* Author: NIIBE Yutaka <[email protected]> |
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* |
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* This file is a part of Chopstx, a thread library for embedded. |
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* |
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* Chopstx is free software: you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* Chopstx is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* As additional permission under GNU GPL version 3 section 7, you may |
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* distribute non-source form of the Program without the copy of the |
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* GNU GPL normally required by section 4, provided you inform the |
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* receipents of GNU GPL by a written offer. |
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* |
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*/ |
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#include <stdint.h> |
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#include <string.h> |
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#include <chopstx.h> |
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#include <mcu/stm32f103.h> |
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#include "board.h" |
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#include "sys.h" |
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/* |
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* All EXTI registers (EXTI_IMR, EXTI_EMR, EXTI_PR , EXTI_RTSR, and |
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* EXTI_FTSR) have same structure, where each bit of X is used for |
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* line X, from 0 up to 19. |
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* |
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* We use 31-bit of PIN_CONFIG to represent if it's for rising edge or |
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* falling edge. |
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*/ |
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static uint32_t pin_config; |
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#define PINCFG_EDGE 0x80000000 |
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#define PINCFG_EDGE_RISING PINCFG_EDGE |
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void |
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ackbtn_init (chopstx_intr_t *intr) |
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{ |
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uint8_t irq_num; |
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uint32_t afio_exticr_index; |
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uint32_t afio_exticr_extiX_pY; |
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switch (SYS_BOARD_ID) |
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{ |
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case BOARD_ID_FST_01: |
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case BOARD_ID_FST_01G: |
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/* PA2 can be connected to a hall sensor or a switch */ |
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afio_exticr_index = 0; |
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afio_exticr_extiX_pY = AFIO_EXTICR1_EXTI2_PA; |
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irq_num = EXTI2_IRQ; |
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pin_config = 0x0004; /* EXTI_PR_PR2 == EXTI_IMR_MR2 == EXTI_RTSR_TR2 */ |
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pin_config |= PINCFG_EDGE_RISING; |
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break; |
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case BOARD_ID_FST_01SZ: |
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default: |
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/* PA3 is connected to a hall sensor DRV5032FA */ |
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afio_exticr_index = 0; |
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afio_exticr_extiX_pY = AFIO_EXTICR1_EXTI3_PA; |
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irq_num = EXTI3_IRQ; |
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pin_config = 0x0008; /* EXTI_PR_PR3 == EXTI_IMR_MR3 == EXTI_RTSR_TR3 */ |
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pin_config |= PINCFG_EDGE_RISING; |
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break; |
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} |
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/* Configure EXTI line */ |
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if (afio_exticr_extiX_pY) |
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AFIO->EXTICR[afio_exticr_index] |= afio_exticr_extiX_pY; |
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/* Interrupt is masked, now */ |
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EXTI->IMR &= ~(pin_config & ~PINCFG_EDGE); |
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chopstx_claim_irq (intr, irq_num); |
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} |
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void |
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ackbtn_enable (void) |
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{ |
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/* Clear pending interrupt */ |
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EXTI->PR |= (pin_config & ~PINCFG_EDGE); |
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/* Enable interrupt, clearing the mask */ |
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EXTI->IMR |= (pin_config & ~PINCFG_EDGE); |
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/* Configure which edge is detected */ |
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if ((pin_config & PINCFG_EDGE)) |
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EXTI->RTSR |= (pin_config & ~PINCFG_EDGE); |
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else |
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EXTI->FTSR |= (pin_config & ~PINCFG_EDGE); |
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} |
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void |
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ackbtn_disable (void) |
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{ |
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/* Disable interrupt having the mask */ |
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EXTI->IMR &= ~(pin_config & ~PINCFG_EDGE); |
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/* Clear pending interrupt */ |
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EXTI->PR |= (pin_config & ~PINCFG_EDGE); |
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/* Disable edge detection */ |
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EXTI->RTSR &= ~(pin_config & ~PINCFG_EDGE); |
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EXTI->FTSR &= ~(pin_config & ~PINCFG_EDGE); |
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}
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