Add ack-botton driver.

contrib/ackbtn-stm32f103.c

@@ -0,0 +1,87 @@
+/*
+ * ackbtn-stm32f103.c - Acknowledge button support for STM32F103
+ *
+ * Copyright (C) 2018  g10 Code GmbH
+ * Author: NIIBE Yutaka <gniibe@fsij.org>
+ *
+ * This file is a part of Chopstx, a thread library for embedded.
+ *
+ * Chopstx is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chopstx is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As additional permission under GNU GPL version 3 section 7, you may
+ * distribute non-source form of the Program without the copy of the
+ * GNU GPL normally required by section 4, provided you inform the
+ * receipents of GNU GPL by a written offer.
+ *
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <chopstx.h>
+
+#include "board.h"
+#include "mcu/stm32f103.h"
+
+static uint32_t pin_config;
+
+void
+ackbtn_init (chopstx_intr_t *intr)
+{
+  uint8_t irq_num;
+  uint32_t afio_exticr_index;
+  uint32_t afio_exticr_extiX_pY;
+  int rising_edge;
+
+  switch (SYS_BOARD_ID)
+    {
+    case BOARD_ID_FST_01SZ:
+    default:
+      /* PA3 is connected to a hall sensor DRV5032FA */
+      afio_exticr_index = 0;
+      afio_exticr_extiX_pY = AFIO_EXTICR1_EXTI3_PA;
+      irq_num = EXTI3_IRQ;
+      pin_config = 0x0008; /* EXTI_PR_PR3 == EXTI_IMR_MR3 == EXTI_RTSR_TR3 */
+      rising_edge = 1;
+      break;
+    }
+
+  chopstx_claim_irq (intr, irq_num);
+
+  /* Configure EXTI line */
+  if (afio_exticr_extiX_pY)
+    AFIO->EXTICR[afio_exticr_index] |= afio_exticr_extiX_pY;
+
+  /* Interrupt is masked, now */
+  EXTI->IMR &= ~pin_config;
+
+  /* Configure which edge is detected */
+  if (rising_edge)
+    EXTI->RTSR |= pin_config;
+  else
+    EXTI->FTSR |= pin_config;
+}
+
+void
+ackbtn_enable (void)
+{
+  EXTI->PR |= pin_config;	/* Clear pending interrupt */
+  EXTI->IMR |= pin_config;	/* Enable interrupt clearing the mask */
+}
+
+void
+ackbtn_disable (void)
+{
+  EXTI->IMR &= ~pin_config;	/* Disable interrupt having the mask */
+  EXTI->PR |= pin_config;	/* Clear pending interrupt */
+}