add timer peripheral

4 files changed, 129 insertions, 9 deletions

diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
index 55d6e91d4..931e4d063 100644
--- a/ports/esp32s2/Makefile
+++ b/ports/esp32s2/Makefile
@@ -188,6 +188,7 @@ SRC_C += \
 	lib/utils/pyexec.c \
 	lib/utils/stdout_helpers.c \
 	lib/utils/sys_stdio_mphal.c \
+	peripherals/timer.c \
 	peripherals/pcnt.c \
 	peripherals/pins.c \
 	peripherals/rmt.c \
diff --git a/ports/esp32s2/peripherals/timer.c b/ports/esp32s2/peripherals/timer.c
new file mode 100644
index 000000000..3aee33dc5
--- /dev/null
+++ b/ports/esp32s2/peripherals/timer.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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 "peripherals/timer.h"
+
+#define TIMER_FREE 1
+#define TIMER_BUSY 0
+
+static uint8_t timer_state[2][2];
+
+void peripherals_timer_reset(void) {
+    timer_index_t timer;
+    for (uint8_t i = 0; i < 2; i++) {
+        for (uint8_t j = 0; j < 2; j++) {
+            if (timer_state[i][j] == TIMER_BUSY) {
+                timer.idx = (timer_idx_t)j;
+                timer.group = (timer_group_t)i;
+                timer_state[i][j] = TIMER_FREE;
+                peripherals_timer_deinit(&timer);
+            }
+        }
+    }
+}
+
+void peripherals_timer_init(const timer_config_t * config, timer_index_t * timer) {
+    // get free timer
+    for (uint8_t i = 0; i < 2; i++) {
+        for (uint8_t j = 0; j < 2; j++) {
+            if (timer_state[i][j] == TIMER_FREE) {
+                timer->idx = (timer_idx_t)j;
+                timer->group = (timer_group_t)i;
+                timer_state[i][j] = TIMER_BUSY;
+                goto init_timer;
+            } else if (i == 1 && j == 1) {
+                timer->idx = TIMER_MAX;
+                timer->group = TIMER_GROUP_MAX;
+                return;
+            }
+        }
+    }
+
+init_timer:
+    // initialize timer module
+    timer_init(timer->group, timer->idx, config);
+    timer_set_counter_value(timer->group, timer->idx, 0);
+}
+
+void peripherals_timer_deinit(timer_index_t * timer) {
+    timer_deinit(timer->group, timer->idx);
+}
diff --git a/ports/esp32s2/peripherals/timer.h b/ports/esp32s2/peripherals/timer.h
new file mode 100644
index 000000000..8c9ebd91c
--- /dev/null
+++ b/ports/esp32s2/peripherals/timer.h
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 microDev
+ *
+ * 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_ESP32S2_PERIPHERALS_TIMER_HANDLER_H
+#define MICROPY_INCLUDED_ESP32S2_PERIPHERALS_TIMER_HANDLER_H
+
+#include "driver/timer.h"
+
+typedef struct {
+    timer_idx_t idx;
+    timer_group_t group;
+} timer_index_t;
+
+extern void peripherals_timer_init(const timer_config_t * config, timer_index_t * timer);
+extern void peripherals_timer_deinit(timer_index_t * timer);
+extern void peripherals_timer_reset(void);
+
+#endif  // MICROPY_INCLUDED_ESP32S2_PERIPHERALS_TIMER_HANDLER_H
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index ef032c4a7..4bf792516 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -50,6 +50,7 @@
 
 #include "peripherals/rmt.h"
 #include "peripherals/pcnt.h"
+#include "peripherals/timer.h"
 #include "components/heap/include/esp_heap_caps.h"
 #include "components/soc/soc/esp32s2/include/soc/cache_memory.h"
 
@@ -103,15 +104,6 @@ void reset_port(void) {
     analogout_reset();
 #endif
 
-#if CIRCUITPY_PULSEIO
-    esp32s2_peripherals_rmt_reset();
-    pulsein_reset();
-#endif
-
-#if CIRCUITPY_PWMIO
-    pwmout_reset();
-#endif
-
 #if CIRCUITPY_BUSIO
     i2c_reset();
     spi_reset();
@@ -122,6 +114,19 @@ void reset_port(void) {
     peripherals_pcnt_reset();
 #endif
 
+#if CIRCUITPY_FREQUENCYIO
+    peripherals_timer_reset();
+#endif
+
+#if CIRCUITPY_PULSEIO
+    esp32s2_peripherals_rmt_reset();
+    pulsein_reset();
+#endif
+
+#if CIRCUITPY_PWMIO
+    pwmout_reset();
+#endif
+
 #if CIRCUITPY_RTC
     rtc_reset();
 #endif