Diff: targets/TARGET_WIZNET/TARGET_W7500x/pwmout_api.c

Revision:

149:156823d33999

Parent:

144:ef7eb2e8f9f7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_WIZNET/TARGET_W7500x/pwmout_api.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,145 @@
+/* mbed Microcontroller Library 
+ *******************************************************************************
+ * Copyright (c) 2015 WIZnet Co.,Ltd. All rights reserved.
+ * 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 ARM Limited 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"
+#include "W7500x_pwm.h"
+
+static PWM_TimerModeInitTypeDef TimerModeStructure;
+
+void pwmout_init(pwmout_t* obj, PinName pin)
+{
+    // Get the peripheral name from the pin and assign it to the object
+    obj->PWM_CHx = (PWM_CHn_TypeDef *)pinmap_peripheral(pin, PinMap_PWM);
+
+    if (obj->PWM_CHx == (PWM_CHn_TypeDef *)NC) {
+        error("PWM error: pinout mapping failed.");
+    }
+
+    // Configure GPIO
+    pinmap_pinout(pin, PinMap_PWM);
+    
+    GetSystemClock();
+
+    obj->pin = pin;
+    
+    pwmout_period_us(obj, 20000); // 20 ms per default
+}
+
+void pwmout_free(pwmout_t* obj)
+{
+    // Configure GPIO
+    pin_function(obj->pin, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_NOPULL, Px_AFSR_AF0));
+}
+
+void pwmout_write(pwmout_t* obj, float value)
+{
+    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);
+    
+    PWM_CHn_Stop(obj->PWM_CHx);
+
+    TimerModeStructure.PWM_CHn_PR = obj->PrescalerValue - 1;
+    TimerModeStructure.PWM_CHn_MR = obj->pulse;
+    TimerModeStructure.PWM_CHn_LR = obj->period; 
+    TimerModeStructure.PWM_CHn_UDMR = PWM_CHn_UDMR_UpCount;
+    TimerModeStructure.PWM_CHn_PDMR = PWM_CHn_PDMR_Periodic;
+    
+    PWM_TimerModeInit(obj->PWM_CHx, &TimerModeStructure);
+    
+    PWM_CHn_Start(obj->PWM_CHx);
+}
+
+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)
+{
+    PWM_CHn_Stop(obj->PWM_CHx);
+    // Update the SystemCoreClock variable
+    SystemCoreClockUpdate();
+
+    obj->period = (us * 2) - 1;
+    obj->pulse = us / 2;
+    
+    obj->PrescalerValue = (SystemCoreClock / 1000000) / 2;
+    TimerModeStructure.PWM_CHn_PR = obj->PrescalerValue - 1;
+    TimerModeStructure.PWM_CHn_MR = obj->pulse;
+    TimerModeStructure.PWM_CHn_LR = obj->period; 
+    TimerModeStructure.PWM_CHn_UDMR = PWM_CHn_UDMR_UpCount;
+    TimerModeStructure.PWM_CHn_PDMR = PWM_CHn_PDMR_Periodic;
+    
+    PWM_TimerModeInit(obj->PWM_CHx, &TimerModeStructure);
+    PWM_CtrlPWMOutputEnable(obj->PWM_CHx);
+}
+
+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)(2 * us) / (float)obj->period;
+    pwmout_write(obj, value);
+}
+
+#endif