Reset timers separate from pwmio

This prevents timer leakage on builds without pwmio.

Fixes adafruit#5057

Author: tannewt

ports/atmel-samd/Makefile

@@ -322,6 +322,14 @@ SRC_C += \
 	reset.c \
 	timer_handler.c \
 
+ifeq ($(CIRCUITPY_PWMIO),1)
+SRC_C += shared_timers.c
+endif
+
+ifeq ($(CIRCUITPY_AUDIOIO),1)
+SRC_C += shared_timers.c
+endif
+
 ifeq ($(CIRCUITPY_SDIOIO),1)
 SRC_C += ports/atmel-samd/sd_mmc/sd_mmc.c
 endif

ports/atmel-samd/common-hal/pwmio/PWMOut.c

@@ -60,24 +60,6 @@ uint8_t tcc_channels[3];   // Set by pwmout_reset() to {0xf0, 0xfc, 0xfc} initia
 uint8_t tcc_channels[5];   // Set by pwmout_reset() to {0xc0, 0xf0, 0xf8, 0xfc, 0xfc} initially.
 #endif
 
-static uint8_t never_reset_tc_or_tcc[TC_INST_NUM + TCC_INST_NUM];
-
-STATIC void timer_refcount(int index, bool is_tc, int increment) {
-    if (is_tc) {
-        never_reset_tc_or_tcc[index] += increment;
-    } else {
-        never_reset_tc_or_tcc[TC_INST_NUM + index] += increment;
-    }
-}
-
-void timer_never_reset(int index, bool is_tc) {
-    timer_refcount(index, is_tc, 1);
-}
-
-void timer_reset_ok(int index, bool is_tc) {
-    timer_refcount(index, is_tc, -1);
-}
-
 
 void common_hal_pwmio_pwmout_never_reset(pwmio_pwmout_obj_t *self) {
     timer_never_reset(self->timer->index, self->timer->is_tc);
@@ -97,32 +79,14 @@ void pwmout_reset(void) {
     }
     Tcc *tccs[TCC_INST_NUM] = TCC_INSTS;
     for (int i = 0; i < TCC_INST_NUM; i++) {
-        if (never_reset_tc_or_tcc[TC_INST_NUM + i] > 0) {
+        if (!timer_ok_to_reset(i, false)) {
             continue;
         }
-        // Disable the module before resetting it.
-        if (tccs[i]->CTRLA.bit.ENABLE == 1) {
-            tccs[i]->CTRLA.bit.ENABLE = 0;
-            while (tccs[i]->SYNCBUSY.bit.ENABLE == 1) {
-            }
-        }
         uint8_t mask = 0xff;
         for (uint8_t j = 0; j < tcc_cc_num[i]; j++) {
             mask <<= 1;
         }
         tcc_channels[i] = mask;
-        tccs[i]->CTRLA.bit.SWRST = 1;
-        while (tccs[i]->CTRLA.bit.SWRST == 1) {
-        }
-    }
-    Tc *tcs[TC_INST_NUM] = TC_INSTS;
-    for (int i = 0; i < TC_INST_NUM; i++) {
-        if (never_reset_tc_or_tcc[i] > 0) {
-            continue;
-        }
-        tcs[i]->COUNT16.CTRLA.bit.SWRST = 1;
-        while (tcs[i]->COUNT16.CTRLA.bit.SWRST == 1) {
-        }
     }
 }
 

ports/atmel-samd/shared_timers.c

@@ -0,0 +1,84 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+
+#include "samd/timers.h"
+
+#include "shared_timers.h"
+
+static uint8_t never_reset_tc_or_tcc[TC_INST_NUM + TCC_INST_NUM];
+
+static void timer_refcount(int index, bool is_tc, int increment) {
+    if (is_tc) {
+        never_reset_tc_or_tcc[index] += increment;
+    } else {
+        never_reset_tc_or_tcc[TC_INST_NUM + index] += increment;
+    }
+}
+
+void timer_never_reset(int index, bool is_tc) {
+    timer_refcount(index, is_tc, 1);
+}
+
+void timer_reset_ok(int index, bool is_tc) {
+    timer_refcount(index, is_tc, -1);
+}
+
+bool timer_ok_to_reset(int index, bool is_tc) {
+    if (is_tc) {
+        return never_reset_tc_or_tcc[index] == 0;
+    }
+    return never_reset_tc_or_tcc[TC_INST_NUM + index] == 0;
+}
+
+void reset_timers(void) {
+    // Reset all timers
+    Tcc *tccs[TCC_INST_NUM] = TCC_INSTS;
+    for (int i = 0; i < TCC_INST_NUM; i++) {
+        if (!timer_ok_to_reset(i, false)) {
+            continue;
+        }
+        // Disable the module before resetting it.
+        if (tccs[i]->CTRLA.bit.ENABLE == 1) {
+            tccs[i]->CTRLA.bit.ENABLE = 0;
+            while (tccs[i]->SYNCBUSY.bit.ENABLE == 1) {
+            }
+        }
+        tccs[i]->CTRLA.bit.SWRST = 1;
+        while (tccs[i]->CTRLA.bit.SWRST == 1) {
+        }
+    }
+    Tc *tcs[TC_INST_NUM] = TC_INSTS;
+    for (int i = 0; i < TC_INST_NUM; i++) {
+        if (!timer_ok_to_reset(i, true)) {
+            continue;
+        }
+        tcs[i]->COUNT16.CTRLA.bit.SWRST = 1;
+        while (tcs[i]->COUNT16.CTRLA.bit.SWRST == 1) {
+        }
+    }
+}

ports/atmel-samd/shared_timers.h

@@ -0,0 +1,36 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
+ *
+ * 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.
+ */
+#ifndef MICROPY_INCLUDED_ATMEL_SAMD_SHARED_TIMERS_H
+#define MICROPY_INCLUDED_ATMEL_SAMD_SHARED_TIMERS_H
+
+#include <stdbool.h>
+
+void timer_never_reset(int index, bool is_tc);
+void timer_reset_ok(int index, bool is_tc);
+bool timer_ok_to_reset(int index, bool is_tc);
+void reset_timers(void);
+
+#endif  // MICROPY_INCLUDED_ATMEL_SAMD_SHARED_TIMERS_H

ports/atmel-samd/supervisor/port.c

@@ -77,6 +77,7 @@
 #include "samd/dma.h"
 #include "shared-bindings/microcontroller/__init__.h"
 #include "shared-bindings/rtc/__init__.h"
+#include "shared_timers.h"
 #include "reset.h"
 
 #include "supervisor/shared/safe_mode.h"
@@ -347,6 +348,9 @@ void reset_port(void) {
     #if CIRCUITPY_PWMIO
     pwmout_reset();
     #endif
+    #if CIRCUITPY_PWMIO || CIRCUITPY_AUDIOIO
+    reset_timers();
+    #endif
 
     #if CIRCUITPY_ANALOGIO
     analogin_reset();

ports/atmel-samd/timer_handler.h

@@ -36,8 +36,4 @@
 void set_timer_handler(bool is_tc, uint8_t index, uint8_t timer_handler);
 void shared_timer_handler(bool is_tc, uint8_t index);
 
-// implementation of these functions is in PWMOut.c
-void timer_never_reset(int index, bool is_tc);
-void timer_reset_ok(int index, bool is_tc);
-
 #endif  // MICROPY_INCLUDED_ATMEL_SAMD_TIMER_HANDLER_H