francois-berder commented on a change in pull request #329: Wi-Fire: Implement 
hal_timer
URL: 
https://github.com/apache/incubator-mynewt-core/pull/329#discussion_r121780808
 
 

 ##########
 File path: hw/mcu/microchip/pic32mz2048efg100/src/hal_timer.c
 ##########
 @@ -0,0 +1,548 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <os/os.h>
+#include <stdint.h>
+#include <xc.h>
+#include "hal/hal_timer.h"
+#include "mcu/mips_hal.h"
+
+#define PIC32MZ_TIMER_COUNT         (8)
+#define PIC32MZ_PRESCALER_COUNT     (8)
+
+#define TxCON(T)        (base_address[T][0x0 / 0x4])
+#define TxCONCLR(T)     (base_address[T][0x4 / 0x4])
+#define TxCONSET(T)     (base_address[T][0x8 / 0x4])
+#define TMRx(T)         (base_address[T][0x10 / 0x4])
+#define PRx(T)          (base_address[T][0x20 / 0x4])
+
+static volatile uint32_t * base_address[PIC32MZ_TIMER_COUNT] = {
+    (volatile uint32_t *)_TMR2_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR3_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR4_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR5_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR6_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR7_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR8_BASE_ADDRESS,
+    (volatile uint32_t *)_TMR9_BASE_ADDRESS
+};
+
+static uint32_t timer_prescalers[PIC32MZ_PRESCALER_COUNT] =
+{1, 2, 4, 8, 16, 32, 64, 256};
+struct pic32_timer {
+    uint32_t index;
+    uint64_t interrupt_count;
+    uint32_t interrupt_per_tick;
+    uint64_t expiry; /* The unit is number of interrupts */
+    TAILQ_HEAD(hal_timer_qhead, hal_timer) hal_timer_queue;
+};
+static struct pic32_timer timers[PIC32MZ_TIMER_COUNT];
+
+
+static inline uint32_t
+hal_timer_get_prescaler(int timer_num)
+{
+    uint32_t index =
+        (TxCON(timer_num) & _T2CON_TCKPS_MASK) >> _T2CON_TCKPS_POSITION;
+    return timer_prescalers[index];
+}
+
+static inline uint32_t
+hal_timer_get_peripheral_base_clock(void)
+{
+    return MYNEWT_VAL(CLOCK_FREQ) / ((PB3DIV & _PB3DIV_PBDIV_MASK) + 1);
+}
+
+static void
+hal_timer_enable_int(int timer_num)
+{
+    switch (timer_num) {
+        case 0:
+            IPC2CLR = _IPC2_T2IP_MASK | _IPC2_T2IS_MASK;
+            IPC2SET = 3 << _IPC2_T2IP_POSITION;
+            IFS0CLR = _IFS0_T2IF_MASK;
+            IEC0SET = _IEC0_T2IE_MASK;
+            break;
+        case 1:
+            IPC3CLR = _IPC3_T3IP_MASK | _IPC3_T3IS_MASK;
+            IPC3SET = 3 << _IPC3_T3IP_POSITION;
+            IFS0CLR = _IFS0_T3IF_MASK;
+            IEC0SET = _IEC0_T3IE_MASK;
+            break;
+        case 2:
+            IPC4CLR = _IPC4_T4IP_MASK | _IPC4_T4IS_MASK;
+            IPC4SET = 3 << _IPC4_T4IP_POSITION;
+            IFS0CLR = _IFS0_T4IF_MASK;
+            IEC0SET = _IEC0_T4IE_MASK;
+            break;
+        case 3:
+            IPC6CLR = _IPC6_T5IP_MASK | _IPC6_T5IS_MASK;
+            IPC6SET = 3 << _IPC6_T5IP_POSITION;
+            IFS0CLR = _IFS0_T5IF_MASK;
+            IEC0SET = _IEC0_T5IE_MASK;
+            break;
+        case 4:
+            IPC7CLR = _IPC7_T6IP_MASK | _IPC7_T6IS_MASK;
+            IPC7SET = 3 << _IPC7_T6IP_POSITION;
+            IFS0CLR = _IFS0_T6IF_MASK;
+            IEC0SET = _IEC0_T6IE_MASK;
+            break;
+        case 5:
+            IPC8CLR = _IPC8_T7IP_MASK | _IPC8_T7IS_MASK;
+            IPC8SET = 3 << _IPC8_T7IP_POSITION;
+            IFS1CLR = _IFS1_T7IF_MASK;
+            IEC1SET = _IEC1_T7IE_MASK;
+            break;
+        case 6:
+            IPC9CLR = _IPC9_T8IP_MASK | _IPC9_T8IS_MASK;
+            IPC9SET = 3 << _IPC9_T8IP_POSITION;
+            IFS1CLR = _IFS1_T8IF_MASK;
+            IEC1SET = _IEC1_T8IE_MASK;
+            break;
+        case 7:
+            IPC10CLR = _IPC10_T9IP_MASK | _IPC10_T9IS_MASK;
+            IPC10SET = 3 << _IPC10_T9IP_POSITION;
+            IFS1CLR = _IFS1_T9IF_MASK;
+            IEC1SET = _IEC1_T9IE_MASK;
+            break;
+    }
+}
+
+static void
+hal_timer_disable_int(int timer_num)
+{
+    switch (timer_num) {
+        case 0:
+            IEC0CLR = _IEC0_T2IE_MASK;
+            IFS0CLR = _IFS0_T2IF_MASK;
+            break;
+        case 1:
+            IEC0CLR = _IEC0_T3IE_MASK;
+            IFS0CLR = _IFS0_T3IF_MASK;
+            break;
+        case 2:
+            IEC0CLR = _IEC0_T4IE_MASK;
+            IFS0CLR = _IFS0_T4IF_MASK;
+            break;
+        case 3:
+            IEC0CLR = _IEC0_T5IE_MASK;
+            IFS0CLR = _IFS0_T5IF_MASK;
+            break;
+        case 4:
+            IEC0CLR = _IEC0_T6IE_MASK;
+            IFS0CLR = _IFS0_T6IF_MASK;
+            break;
+        case 5:
+            IEC1CLR = _IEC1_T7IE_MASK;
+            IFS1CLR = _IFS1_T7IF_MASK;
+            break;
+        case 6:
+            IEC1CLR = _IEC1_T8IE_MASK;
+            IFS1CLR = _IFS1_T8IF_MASK;
+            break;
+        case 7:
+            IEC1CLR = _IEC1_T9IE_MASK;
+            IFS1CLR = _IFS1_T9IF_MASK;
+            break;
+    }
+
+}
+
+static void
+compute_next_expiry(struct pic32_timer *bsp_timer)
+{
+    struct hal_timer *first = TAILQ_FIRST(&bsp_timer->hal_timer_queue);
+    if (first != NULL) {
+        bsp_timer->expiry = first->expiry;
+        bsp_timer->expiry *= bsp_timer->interrupt_per_tick;
+    }
+}
+
+static void
+handle_timer_list(int timer_num)
+{
+    int i;
+    int timers_to_remove = 0;
+    uint32_t current_tick = hal_timer_read(timer_num);
+    struct hal_timer *entry;
+
+    TAILQ_FOREACH(entry, &timers[timer_num].hal_timer_queue, link) {
+        if (entry->expiry <= current_tick) {
+            entry->cb_func(entry->cb_arg);
+            ++timers_to_remove;
+        } else {
+            break;
+        }
+    }
+
+    for (i = 0; i < timers_to_remove; ++i) {
+        TAILQ_REMOVE(&timers[timer_num].hal_timer_queue,
+                     TAILQ_FIRST(&timers[timer_num].hal_timer_queue), link);
+    }
+    if (timers_to_remove != 0) {
+        compute_next_expiry(&timers[timer_num]);
+    }
+}
+
+void
+__attribute__((interrupt(IPL3AUTO), vector(_TIMER_2_VECTOR)))
+timer2_isr(void)
+{
+    ++timers[0].interrupt_count;
+
+    if (!(TAILQ_EMPTY(&timers[0].hal_timer_queue)) &&
+        timers[0].expiry <= timers[0].interrupt_count) {
 
 Review comment:
   Thanks! I will do the appropriate changes.
 
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