Added support for ANALOGOUT

Author: AGlass0fMilk

targets/TARGET_STM/TARGET_STM32G4/analogout_device.c

@@ -0,0 +1,169 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2015, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "mbed_assert.h"
+#include "analogout_api.h"
+
+#if DEVICE_ANALOGOUT
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "PeripheralPins.h"
+
+// These variables are used for the "free" function
+static int pa4_used = 0;
+static int pa5_used = 0;
+
+#if STATIC_PINMAP_READY
+#define ANALOGOUT_INIT_DIRECT analogout_init_direct
+void analogout_init_direct(dac_t *obj, const PinMap *pinmap)
+#else
+#define ANALOGOUT_INIT_DIRECT _analogout_init_direct
+static void _analogout_init_direct(dac_t *obj, const PinMap *pinmap)
+#endif
+{
+    DAC_ChannelConfTypeDef sConfig = {0};
+
+    // Get the peripheral name from the pin and assign it to the object
+    obj->dac = (DACName)pinmap->peripheral;
+    MBED_ASSERT(obj->dac != (DACName)NC);
+
+    // Get the pin function and assign the used channel to the object
+    uint32_t function = (uint32_t)pinmap->function;
+    MBED_ASSERT(function != (uint32_t)NC);
+
+    // Save the channel for the write and read functions
+    switch (STM_PIN_CHANNEL(function)) {
+        case 1:
+            obj->channel = DAC_CHANNEL_1;
+            break;
+#if defined(DAC_CHANNEL_2)
+        case 2:
+            obj->channel = DAC_CHANNEL_2;
+            break;
+#endif
+        default:
+            error("Unknown DAC channel");
+            break;
+    }
+
+    // Configure GPIO
+    pin_function(pinmap->pin, pinmap->function);
+    pin_mode(pinmap->pin, PullNone);
+
+    // Save the pin for future use
+    obj->pin = pinmap->pin;
+
+    // Enable DAC clock
+    if (obj->dac == DAC_1) {
+        __HAL_RCC_DAC1_CLK_ENABLE();
+    }
+#if defined(DAC2)
+    if (obj->dac == DAC_2) {
+        __HAL_RCC_DAC2_CLK_ENABLE();
+    }
+#endif
+
+    // Configure DAC
+    obj->handle.Instance = (DAC_TypeDef *)(obj->dac);
+    obj->handle.State = HAL_DAC_STATE_RESET;
+
+    if (HAL_DAC_Init(&obj->handle) != HAL_OK) {
+        error("HAL_DAC_Init failed");
+    }
+
+    /* Enable both Buffer and Switch in the configuration,
+     * letting HAL layer in charge of selecting either one
+     * or the other depending on the actual DAC instance and
+     * channel being configured.
+     */
+    sConfig.DAC_Trigger      = DAC_TRIGGER_NONE;
+    sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
+#if defined(DAC_OUTPUTSWITCH_ENABLE)
+    sConfig.DAC_OutputSwitch = DAC_OUTPUTSWITCH_ENABLE;
+#endif
+
+    if (pinmap->pin == PA_4) {
+        pa4_used = 1;
+    }
+
+    if (pinmap->pin == PA_5) {
+        pa5_used = 1;
+    }
+
+    if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
+        error("HAL_DAC_ConfigChannel failed");
+    }
+
+    analogout_write_u16(obj, 0);
+}
+
+void analogout_init(dac_t *obj, PinName pin)
+{
+    int peripheral = (int)pinmap_peripheral(pin, PinMap_DAC);
+    int function = (int)pinmap_find_function(pin, PinMap_DAC);
+
+    const PinMap static_pinmap = {pin, peripheral, function};
+
+    ANALOGOUT_INIT_DIRECT(obj, &static_pinmap);
+}
+
+void analogout_free(dac_t *obj)
+{
+    // Reset DAC and disable clock
+    if (obj->pin == PA_4) {
+        pa4_used = 0;
+    }
+    if (obj->pin == PA_5) {
+        pa5_used = 0;
+    }
+
+    if ((pa4_used == 0) && (pa5_used == 0)) {
+        __HAL_RCC_DAC1_FORCE_RESET();
+        __HAL_RCC_DAC1_RELEASE_RESET();
+        __HAL_RCC_DAC1_CLK_DISABLE();
+    }
+
+#if defined(DAC2)
+    if (obj->pin == PA_6) {
+        __HAL_RCC_DAC2_FORCE_RESET();
+        __HAL_RCC_DAC2_RELEASE_RESET();
+        __HAL_RCC_DAC2_CLK_DISABLE();
+    }
+#endif
+
+    // Configure GPIO
+    pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+}
+
+const PinMap *analogout_pinmap()
+{
+    return PinMap_DAC;
+}
+
+#endif // DEVICE_ANALOGOUT

targets/targets.json

@@ -15048,6 +15048,7 @@
             "lpticker_delay_ticks": 0
         },
         "device_has_add": [
+            "ANALOGOUT",
             "FLASH",
             "MPU"
         ],