esp32: Add support for onewire protocol via OneWire module.

dpgeorge · dpgeorge · commit 6afe413d8575 · 2017-03-03T15:20:02.000+11:00
Reuses a lot of code from esp8266.
diff --git a/esp32/Makefile b/esp32/Makefile
@@ -116,6 +116,7 @@ SRC_C = \
 	mphalport.c \
 	fatfs_port.c \
 	help.c \
+	esponewire.c \
 	modutime.c \
 	moduos.c \
 	machine_pin.c \
@@ -133,6 +134,10 @@ STM_SRC_C = $(addprefix stmhal/,\
 	input.c \
 	)
 
+ESP8266_SRC_C = $(addprefix esp8266/,\
+	modonewire.c \
+	)
+
 EXTMOD_SRC_C = $(addprefix extmod/,\
 	)
 
@@ -176,12 +181,13 @@ OBJ_MP =
 OBJ_MP += $(PY_O)
 OBJ_MP += $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
 OBJ_MP += $(addprefix $(BUILD)/, $(STM_SRC_C:.c=.o))
+OBJ_MP += $(addprefix $(BUILD)/, $(ESP8266_SRC_C:.c=.o))
 OBJ_MP += $(addprefix $(BUILD)/, $(EXTMOD_SRC_C:.c=.o))
 OBJ_MP += $(addprefix $(BUILD)/, $(LIB_SRC_C:.c=.o))
 OBJ_MP += $(addprefix $(BUILD)/, $(DRIVERS_SRC_C:.c=.o))
 
 # List of sources for qstr extraction
-SRC_QSTR += $(SRC_C) $(STM_SRC_C) $(EXTMOD_SRC_C) $(DRIVERS_SRC_C)
+SRC_QSTR += $(SRC_C) $(STM_SRC_C) $(ESP8266_SRC_C) $(EXTMOD_SRC_C) $(DRIVERS_SRC_C)
 # Append any auto-generated sources that are needed by sources listed in SRC_QSTR
 SRC_QSTR_AUTO_DEPS +=
 
diff --git a/esp32/esponewire.c b/esp32/esponewire.c
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015-2017 Damien P. George
+ *
+ * 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 "py/mphal.h"
+#include "esp8266/esponewire.h"
+
+#define TIMING_RESET1 (0)
+#define TIMING_RESET2 (1)
+#define TIMING_RESET3 (2)
+#define TIMING_READ1 (3)
+#define TIMING_READ2 (4)
+#define TIMING_READ3 (5)
+#define TIMING_WRITE1 (6)
+#define TIMING_WRITE2 (7)
+#define TIMING_WRITE3 (8)
+
+uint16_t esp_onewire_timings[9] = {480, 40, 420, 5, 5, 40, 10, 50, 10};
+
+#define DELAY_US mp_hal_delay_us_fast
+
+int esp_onewire_reset(mp_hal_pin_obj_t pin) {
+    mp_hal_pin_write(pin, 0);
+    DELAY_US(esp_onewire_timings[TIMING_RESET1]);
+    uint32_t i = disable_irq();
+    mp_hal_pin_write(pin, 1);
+    DELAY_US(esp_onewire_timings[TIMING_RESET2]);
+    int status = !mp_hal_pin_read(pin);
+    enable_irq(i);
+    DELAY_US(esp_onewire_timings[TIMING_RESET3]);
+    return status;
+}
+
+int esp_onewire_readbit(mp_hal_pin_obj_t pin) {
+    mp_hal_pin_write(pin, 1);
+    uint32_t i = disable_irq();
+    mp_hal_pin_write(pin, 0);
+    DELAY_US(esp_onewire_timings[TIMING_READ1]);
+    mp_hal_pin_write(pin, 1);
+    DELAY_US(esp_onewire_timings[TIMING_READ2]);
+    int value = mp_hal_pin_read(pin);
+    enable_irq(i);
+    DELAY_US(esp_onewire_timings[TIMING_READ3]);
+    return value;
+}
+
+void esp_onewire_writebit(mp_hal_pin_obj_t pin, int value) {
+    uint32_t i = disable_irq();
+    mp_hal_pin_write(pin, 0);
+    DELAY_US(esp_onewire_timings[TIMING_WRITE1]);
+    if (value) {
+        mp_hal_pin_write(pin, 1);
+    }
+    DELAY_US(esp_onewire_timings[TIMING_WRITE2]);
+    mp_hal_pin_write(pin, 1);
+    DELAY_US(esp_onewire_timings[TIMING_WRITE3]);
+    enable_irq(i);
+}
diff --git a/esp32/modules/onewire.py b/esp32/modules/onewire.py
@@ -0,0 +1 @@
+../../esp8266/modules/onewire.py
diff --git a/esp32/mpconfigport.h b/esp32/mpconfigport.h
@@ -150,6 +150,7 @@
 
 // extra built in modules to add to the list of known ones
 extern const struct _mp_obj_module_t esp_module;
+extern const struct _mp_obj_module_t onewire_module;
 extern const struct _mp_obj_module_t utime_module;
 extern const struct _mp_obj_module_t uos_module;
 extern const struct _mp_obj_module_t mp_module_usocket;
@@ -158,6 +159,7 @@ extern const struct _mp_obj_module_t mp_module_network;
 
 #define MICROPY_PORT_BUILTIN_MODULES \
     { MP_OBJ_NEW_QSTR(MP_QSTR_esp), (mp_obj_t)&esp_module }, \
+    { MP_OBJ_NEW_QSTR(MP_QSTR__onewire), (mp_obj_t)&onewire_module }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR_utime), (mp_obj_t)&utime_module }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR_uos), (mp_obj_t)&uos_module }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR_usocket), (mp_obj_t)&mp_module_usocket }, \
diff --git a/esp32/mphalport.h b/esp32/mphalport.h
@@ -60,6 +60,7 @@ uint32_t mp_hal_get_cpu_freq(void);
 #define mp_hal_pin_obj_t gpio_num_t
 mp_hal_pin_obj_t machine_pin_get_id(mp_obj_t pin_in);
 #define mp_hal_get_pin_obj(o) machine_pin_get_id(o)
+#define mp_obj_get_pin(o) machine_pin_get_id(o) // legacy name; only to support esp8266/modonewire
 #define mp_hal_pin_name(p) (p)
 static inline void mp_hal_pin_input(mp_hal_pin_obj_t pin) {
     gpio_set_direction(pin, GPIO_MODE_INPUT);
