1 files changed, 97 insertions, 0 deletions
diff --git a/ports/esp32/machine_dac.c b/ports/esp32/machine_dac.c
new file mode 100644
index 000000000..bd0804ec4
--- /dev/null
+++ b/ports/esp32/machine_dac.c
@@ -0,0 +1,97 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Nick Moore
+ *
+ * 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 <stdio.h>
+
+#include "esp_log.h"
+
+#include "driver/gpio.h"
+#include "driver/dac.h"
+
+#include "py/runtime.h"
+#include "py/mphal.h"
+#include "modmachine.h"
+
+typedef struct _mdac_obj_t {
+    mp_obj_base_t base;
+    gpio_num_t gpio_id;
+    dac_channel_t dac_id;
+} mdac_obj_t;
+
+STATIC const mdac_obj_t mdac_obj[] = {
+    {{&machine_dac_type}, GPIO_NUM_25, DAC_CHANNEL_1},
+    {{&machine_dac_type}, GPIO_NUM_26, DAC_CHANNEL_2},
+};
+
+STATIC mp_obj_t mdac_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw,
+        const mp_obj_t *args) {
+
+    mp_arg_check_num(n_args, n_kw, 1, 1, true);
+    gpio_num_t pin_id = machine_pin_get_id(args[0]);
+    const mdac_obj_t *self = NULL;
+    for (int i = 0; i < MP_ARRAY_SIZE(mdac_obj); i++) {
+        if (pin_id == mdac_obj[i].gpio_id) { self = &mdac_obj[i]; break; }
+    }
+    if (!self) mp_raise_ValueError("invalid Pin for DAC");
+
+    esp_err_t err = dac_output_enable(self->dac_id);
+    if (err == ESP_OK) {
+        err = dac_output_voltage(self->dac_id, 0);
+    }
+    if (err == ESP_OK) return MP_OBJ_FROM_PTR(self);
+    mp_raise_ValueError("Parameter Error");
+}
+
+STATIC void mdac_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    mdac_obj_t *self = self_in;
+    mp_printf(print, "DAC(Pin(%u))", self->gpio_id);
+}
+
+STATIC mp_obj_t mdac_write(mp_obj_t self_in, mp_obj_t value_in) {
+    mdac_obj_t *self = self_in;
+    int value = mp_obj_get_int(value_in);
+    if (value < 0 || value > 255) mp_raise_ValueError("Value out of range");
+
+    esp_err_t err = dac_output_voltage(self->dac_id, value);
+    if (err == ESP_OK) return mp_const_none;
+    mp_raise_ValueError("Parameter Error");
+}
+MP_DEFINE_CONST_FUN_OBJ_2(mdac_write_obj, mdac_write);
+
+STATIC const mp_rom_map_elem_t mdac_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mdac_write_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(mdac_locals_dict, mdac_locals_dict_table);
+
+const mp_obj_type_t machine_dac_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_DAC,
+    .print = mdac_print,
+    .make_new = mdac_make_new,
+    .locals_dict = (mp_obj_t)&mdac_locals_dict,
+};