Diff: targets/hal/TARGET_STM/TARGET_DISCO_F051R8/pwmout_api.c

Revision:

130:1dec54e4aec3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_DISCO_F051R8/pwmout_api.c	Fri Mar 21 11:45:09 2014 +0000
@@ -0,0 +1,162 @@
+/* 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"
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "error.h"
+
+static const PinMap PinMap_PWM[] = {
+    {PA_7,  TIM_14, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_4)}, // TIM14_CH1
+    {PC_7,  TIM_3,  STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, // TIM3_CH2
+    {PB_6,  TIM_16, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_2)}, // TIM16_CH1N --> FAIL
+    {NC,    NC,    0}
+};
+
+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 pinout mapping failed");
+    }
+    
+    // Enable TIM clock
+    if (obj->pwm == TIM_3)  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
+    if (obj->pwm == TIM_14) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14, ENABLE);
+    if (obj->pwm == TIM_16) RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM16, ENABLE);
+
+    // Configure GPIO
+    pinmap_pinout(pin, PinMap_PWM);
+    //pin_mode(pin, PullUp);
+    
+    obj->pin = pin;
+    obj->period = 0;
+    obj->pulse = 0;
+    
+    pwmout_period_us(obj, 20000); // 20 ms per default
+}
+
+void pwmout_free(pwmout_t* obj) {
+    TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
+    TIM_DeInit(tim);
+}
+
+void pwmout_write(pwmout_t* obj, float value) {
+    TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
+    TIM_OCInitTypeDef TIM_OCInitStructure;
+  
+    if (value < 0.0) {
+        value = 0.0;
+    } else if (value > 1.0) {
+        value = 1.0;
+    }
+    
+    obj->pulse = (uint32_t)((float)obj->period * value);
+    
+    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
+    TIM_OCInitStructure.TIM_Pulse = obj->pulse;
+
+    // Configure channel 1
+    if (obj->pin == PA_7) {
+        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
+        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
+        TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
+        TIM_OC1Init(tim, &TIM_OCInitStructure);
+    }
+
+    // Configure channel 1N
+    if (obj->pin == PB_6) {
+        TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
+        TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
+        TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
+        TIM_OC1Init(tim, &TIM_OCInitStructure);
+    }
+    
+    // Configure channel 2
+    if (obj->pin == PC_7) {
+        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
+        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;      
+        TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
+        TIM_OC2Init(tim, &TIM_OCInitStructure);
+    }    
+}
+
+float pwmout_read(pwmout_t* obj) {
+    float value = 0;
+    if (obj->period > 0) {
+        value = (float)(obj->pulse) / (float)(obj->period);
+    }
+    return ((value > 1.0) ? (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) {
+    TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
+    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
+    float dc = pwmout_read(obj);
+
+    TIM_Cmd(tim, DISABLE);  
+    
+    obj->period = us;
+  
+    TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
+    TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
+    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
+    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
+    TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
+
+    // Set duty cycle again
+    pwmout_write(obj, dc);
+  
+    TIM_ARRPreloadConfig(tim, ENABLE);
+
+    TIM_Cmd(tim, ENABLE);
+}
+
+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);
+}