--- /dev/null
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2014, 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 "pwmout_api.h"
+
+#if DEVICE_PWMOUT
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "PeripheralPins.h"
+
+static TIM_HandleTypeDef TimHandle;
+
+void pwmout_init(pwmout_t* obj, PinName pin)
+{
+ // Get the peripheral name from the pin and assign it to the object
+ obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
+
+ if (obj->pwm == (PWMName)NC) {
+ error("PWM error: pinout mapping failed.");
+ }
+
+ // Enable TIM clock
+ if (obj->pwm == PWM_1) __TIM1_CLK_ENABLE();
+ if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
+ if (obj->pwm == PWM_15) __TIM15_CLK_ENABLE();
+ if (obj->pwm == PWM_16) __TIM16_CLK_ENABLE();
+ if (obj->pwm == PWM_17) __TIM17_CLK_ENABLE();
+
+ // Configure GPIO
+ pinmap_pinout(pin, PinMap_PWM);
+
+ obj->pin = pin;
+ obj->period = 0;
+ obj->pulse = 0;
+
+ pwmout_period_us(obj, 20000); // 20 ms per default
+}
+
+void pwmout_free(pwmout_t* obj)
+{
+ // Configure GPIO
+ pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
+}
+
+void pwmout_write(pwmout_t* obj, float value)
+{
+ TIM_OC_InitTypeDef sConfig;
+ int channel = 0;
+ int complementary_channel = 0;
+
+ TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
+
+ if (value < (float)0.0) {
+ value = 0.0;
+ } else if (value > (float)1.0) {
+ value = 1.0;
+ }
+
+ obj->pulse = (uint32_t)((float)obj->period * value);
+
+ // Configure channels
+ sConfig.OCMode = TIM_OCMODE_PWM1;
+ sConfig.Pulse = obj->pulse;
+ sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
+ sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
+ sConfig.OCFastMode = TIM_OCFAST_DISABLE;
+ sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
+ sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
+
+ switch (obj->pin) {
+
+ // Channels 1
+ case PA_2:
+ case PA_6:
+ case PA_7:
+ case PA_8:
+ case PA_12:
+ case PB_4:
+ case PB_5:
+ case PB_8:
+ case PB_9:
+ case PB_14:
+ case PC_0:
+ channel = TIM_CHANNEL_1;
+ break;
+
+ // Channels 1N
+ case PA_1:
+ case PA_13:
+ case PB_6:
+ case PB_7:
+ case PB_13:
+ case PC_13:
+ channel = TIM_CHANNEL_1;
+ complementary_channel = 1;
+ break;
+
+ // Channels 2
+ case PA_3:
+ case PA_9:
+ case PB_15:
+ case PC_1:
+ channel = TIM_CHANNEL_2;
+ break;
+
+ // Channels 2N
+ case PB_0:
+ channel = TIM_CHANNEL_2;
+ complementary_channel = 1;
+ break;
+
+ // Channels 3
+ case PA_10:
+ case PC_2:
+ channel = TIM_CHANNEL_3;
+ break;
+
+ // Channels 3N
+ case PB_1:
+ case PF_0:
+ channel = TIM_CHANNEL_3;
+ complementary_channel = 1;
+ break;
+
+ // Channels 4
+ case PA_11:
+ case PC_3:
+ channel = TIM_CHANNEL_4;
+ break;
+
+ default:
+ return;
+ }
+
+ HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
+
+ if (complementary_channel) {
+ HAL_TIMEx_PWMN_Start(&TimHandle, channel);
+ } else {
+ HAL_TIM_PWM_Start(&TimHandle, channel);
+ }
+}
+
+float pwmout_read(pwmout_t* obj)
+{
+ float value = 0;
+ if (obj->period > 0) {
+ value = (float)(obj->pulse) / (float)(obj->period);
+ }
+ return ((value > (float)1.0) ? (float)(1.0) : (value));
+}
+
+void pwmout_period(pwmout_t* obj, float seconds)
+{
+ pwmout_period_us(obj, seconds * 1000000.0f);
+}
+
+void pwmout_period_ms(pwmout_t* obj, int ms)
+{
+ pwmout_period_us(obj, ms * 1000);
+}
+
+void pwmout_period_us(pwmout_t* obj, int us)
+{
+ TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
+
+ float dc = pwmout_read(obj);
+
+ __HAL_TIM_DISABLE(&TimHandle);
+
+ // Update the SystemCoreClock variable
+ SystemCoreClockUpdate();
+
+ TimHandle.Init.Period = us - 1;
+ TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
+ TimHandle.Init.ClockDivision = 0;
+ TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
+ HAL_TIM_PWM_Init(&TimHandle);
+
+ // Set duty cycle again
+ pwmout_write(obj, dc);
+
+ // Save for future use
+ obj->period = us;
+
+ __HAL_TIM_ENABLE(&TimHandle);
+}
+
+void pwmout_pulsewidth(pwmout_t* obj, float seconds)
+{
+ pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
+}
+
+void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
+{
+ pwmout_pulsewidth_us(obj, ms * 1000);
+}
+
+void pwmout_pulsewidth_us(pwmout_t* obj, int us)
+{
+ float value = (float)us / (float)obj->period;
+ pwmout_write(obj, value);
+}
+
+#endif
projects / qmk_firmware.git / blobdiff