Merge pull request #3514 from hierophect/esp32-analogout

ESP32-S2: AnalogOut

Author: tannewt

ports/esp32s2/common-hal/analogio/AnalogOut.c

@@ -35,25 +35,39 @@
 #include "shared-bindings/microcontroller/Pin.h"
 #include "supervisor/shared/translate.h"
 
+#include "components/driver/include/driver/dac_common.h"
+
 #include "common-hal/microcontroller/Pin.h"
 
 void common_hal_analogio_analogout_construct(analogio_analogout_obj_t* self,
         const mcu_pin_obj_t *pin) {
-    mp_raise_NotImplementedError(translate("No DAC on chip"));
+    if (pin == &pin_GPIO17) {
+        self->channel = DAC_CHANNEL_1;
+    } else if (pin == &pin_GPIO18) {
+        self->channel = DAC_CHANNEL_2;
+    } else {
+        mp_raise_ValueError(translate("Invalid DAC pin supplied"));
+    }
+    dac_output_enable(self->channel);
 }
 
 bool common_hal_analogio_analogout_deinited(analogio_analogout_obj_t *self) {
-    return true;
+    return (self->channel == DAC_CHANNEL_MAX);
 }
 
 void common_hal_analogio_analogout_deinit(analogio_analogout_obj_t *self) {
-
+    dac_output_disable(self->channel);
+    self->channel = DAC_CHANNEL_MAX;
 }
 
 void common_hal_analogio_analogout_set_value(analogio_analogout_obj_t *self,
         uint16_t value) {
+    uint8_t dac_value = (value * 255) / 65535;
+    dac_output_enable(self->channel);
+    dac_output_voltage(self->channel, dac_value);
 }
 
 void analogout_reset(void) {
-
+    dac_output_disable(DAC_CHANNEL_1);
+    dac_output_disable(DAC_CHANNEL_2);
 }

ports/esp32s2/common-hal/analogio/AnalogOut.h

@@ -36,7 +36,6 @@ typedef struct {
     mp_obj_base_t base;
     const mcu_pin_obj_t * pin;
     uint8_t channel;
-    uint8_t dac_index:1;
 } analogio_analogout_obj_t;
 
 void analogout_reset(void);

ports/esp32s2/supervisor/port.c

@@ -35,6 +35,7 @@
 #include "freertos/task.h"
 
 #include "common-hal/microcontroller/Pin.h"
+#include "common-hal/analogio/AnalogOut.h"
 #include "common-hal/busio/I2C.h"
 #include "common-hal/busio/SPI.h"
 #include "common-hal/busio/UART.h"
@@ -95,6 +96,10 @@ void reset_port(void) {
     // A larger delay so the idle task can run and do any IDF cleanup needed.
     vTaskDelay(4);
 
+#if CIRCUITPY_ANALOGIO
+    analogout_reset();
+#endif
+
 #if CIRCUITPY_PULSEIO
     esp32s2_peripherals_rmt_reset();
     pulsein_reset();