Add MSTP port to nucleof429zi using DFR0259 RS485 shield (#136)

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
2020-10-30 11:53:57 -05:00
parent 511adb646c
commit 06dde5050c
110 changed files with 67860 additions and 0 deletions
@@ -0,0 +1,125 @@
+/**************************************************************************
+ *
+ * Copyright (C) 2011 Steve Karg <skarg@users.sourceforge.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Module Description:
+ * Generate a periodic timer tick for use by generic timers in the code.
+ *
+ *************************************************************************/
+#include <stdbool.h>
+#include <stdint.h>
+#include "bacnet/basic/sys/mstimer.h"
+#include "bacnet/basic/sys/debug.h"
+#include "stm32f4xx.h"
+#include "led.h"
+
+/* counter for the various timers */
+static volatile unsigned long Millisecond_Counter;
+static volatile struct mstimer_callback_data_t *Callback_Head;
+
+/**
+ * Toggle the state of the debug LED
+ */
+static void timer_debug_toggle(void)
+{
+    led_toggle(LED_LD1);
+}
+
+/**
+ * Handles the interrupt from the timer
+ */
+void SysTick_Handler(void)
+{
+    struct mstimer_callback_data_t *cb;
+
+    /* increment the tick count */
+    Millisecond_Counter++;
+    cb = (struct mstimer_callback_data_t *)Callback_Head;
+    while (cb) {
+        if (mstimer_expired(&cb->timer)) {
+            cb->callback();
+            if (mstimer_interval(&cb->timer) > 0) {
+                mstimer_reset(&cb->timer);
+            }
+        }
+        cb = cb->next;
+    }
+    timer_debug_toggle();
+}
+
+/**
+ * Returns the continuous milliseconds count, which rolls over
+ *
+ * @return the current milliseconds count
+ */
+unsigned long mstimer_now(void)
+{
+    return Millisecond_Counter;
+}
+
+/**
+ * Configures and enables a repeating callback function
+ *
+ * @param cb - pointer to a #mstimer_callback_data_t
+ * @param callback - pointer to a #timer_callback_function function
+ * @param milliseconds - how often to call the function
+ *
+ * @return true if successfully added and enabled
+ */
+void mstimer_callback(struct mstimer_callback_data_t *new_cb,
+    mstimer_callback_function callback,
+    unsigned long milliseconds)
+{
+    struct mstimer_callback_data_t *cb;
+
+    if (new_cb) {
+        new_cb->callback = callback;
+        mstimer_set(&new_cb->timer, milliseconds);
+    }
+    if (Callback_Head) {
+        cb = (struct mstimer_callback_data_t *)Callback_Head;
+        while (cb) {
+            if (!cb->next) {
+                cb->next = new_cb;
+                break;
+            } else {
+                cb = cb->next;
+            }
+        }
+    } else {
+        Callback_Head = new_cb;
+    }
+}
+
+/**
+ * Timer setup for 1 millisecond timer
+ */
+void mstimer_init(void)
+{
+    /* Setup SysTick Timer for 1ms interrupts  */
+    if (SysTick_Config(SystemCoreClock / 1000)) {
+        /* Capture error */
+        while (1)
+            ;
+    }
+    NVIC_EnableIRQ(SysTick_IRQn);
+}