STM32F4-Discovery: Add support for PWM-driver RGB LED

configs/stm32f4discovery/include/board.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * configs/stm32f4discovery/include/board.h
  *
- *   Copyright (C) 2012, 2014-2015 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2012, 2014-2016 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -231,9 +231,7 @@
 /* The STM32F4 Discovery supports one button: */
 
 #define BUTTON_USER        0
-
 #define NUM_BUTTONS        1
-
 #define BUTTON_USER_BIT    (1 << BUTTON_USER)
 
 /* Alternate function pin selections ************************************************/
@@ -280,6 +278,15 @@
 
 #define GPIO_TIM4_CH2OUT GPIO_TIM4_CH2OUT_2
 
+/* RGB LED
+ *
+ * R = TIM1 CH1 on PE9 | G = TIM2 CH2 on PA1 | B = TIM3 CH3 on PB0
+ */
+
+#define GPIO_TIM1_CH1OUT GPIO_TIM1_CH1OUT_2
+#define GPIO_TIM2_CH2OUT GPIO_TIM2_CH2OUT_1
+#define GPIO_TIM3_CH3OUT GPIO_TIM3_CH3OUT_1
+
 /* SPI - There is a MEMS device on SPI1 using these pins: */
 
 #define GPIO_SPI1_MISO GPIO_SPI1_MISO_1

configs/stm32f4discovery/src/Makefile

@@ -76,6 +76,10 @@ ifeq ($(CONFIG_STM32_ETHMAC),y)
 CSRCS += stm32_ethernet.c
 endif
 
+ifeq ($(CONFIG_RGBLED),y)
+CSRCS += stm32_rgbled.c
+endif
+
 ifeq ($(CONFIG_PWM),y)
 CSRCS += stm32_pwm.c
 endif

configs/stm32f4discovery/src/stm32_bringup.c

@@ -99,9 +99,17 @@ int stm32_bringup(void)
   int ret = OK;
 
 #ifdef CONFIG_ZEROCROSS
+  /* Configure the zero-crossing driver */
+
   stm32_zerocross_initialize();
 #endif
 
+#ifdef CONFIG_RGBLED
+  /* Configure the RGB LED driver */
+
+  stm32_rgbled_setup();
+#endif
+
 #if defined(CONFIG_PCA9635PW)
   /* Initialize the PCA9635 chip */
 

configs/stm32f4discovery/src/stm32_rgbled.c

@@ -0,0 +1,183 @@
+/************************************************************************************
+ * configs/stm32f4discovery/src/stm32_rgbled.c
+ *
+ *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.com> 
+ *
+ * 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 NuttX 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 OWNER 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.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/pwm.h>
+#include <nuttx/leds/rgbled.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "up_arch.h"
+#include "stm32_pwm.h"
+#include "stm32f4discovery.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* Configuration ********************************************************************/
+
+#define HAVE_RGBLED 1
+
+#ifndef CONFIG_PWM
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM1
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM2
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM3
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM1_PWM
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM2_PWM
+#  undef HAVE_RGBLED
+#endif
+
+#ifndef CONFIG_STM32_TIM3_PWM
+#  undef HAVE_RGBLED
+#endif
+
+#ifdef HAVE_RGBLED
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: board_pwm_setup
+ *
+ * Description:
+ *   All STM32 architectures must provide the following interface to work with
+ *   examples/pwm.
+ *
+ ************************************************************************************/
+
+int stm32_rgbled_setup(void)
+{
+  static bool initialized = false;
+  struct pwm_lowerhalf_s    *ledr;
+  struct pwm_lowerhalf_s    *ledg;
+  struct pwm_lowerhalf_s    *ledb;
+  struct pwm_info_s info;
+  int ret;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+
+      ledr = stm32_pwminitialize(1);
+      if (!ledr)
+        {
+          dbg("Failed to get the STM32 PWM lower half to LEDR\n");
+          return -ENODEV;
+        }
+
+      /* Define frequency and duty cycle */
+
+      info.frequency = 100;
+      info.duty = 0;
+
+      /* Initialize LED R */
+
+      ledr->ops->setup(ledr);
+      ledr->ops->start(ledr, &info);
+
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+
+      ledg = stm32_pwminitialize(2);
+      if (!ledg)
+        {
+          dbg("Failed to get the STM32 PWM lower half to LEDG\n");
+          return -ENODEV;
+        }
+
+      /* Initialize LED G */
+
+      ledg->ops->setup(ledg);
+      ledg->ops->start(ledg, &info);
+
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+
+      ledb = stm32_pwminitialize(3);
+      if (!ledb)
+        {
+          dbg("Failed to get the STM32 PWM lower half to LEDB\n");
+          return -ENODEV;
+        }
+
+      /* Initialize LED B */
+
+      ledb->ops->setup(ledb);
+      ledb->ops->start(ledb, &info);
+
+      /* Register the PWM driver at "/dev/pwm0" */
+
+      ret = rgbled_register("/dev/rgbled0", ledr, ledg, ledb);
+      if (ret < 0)
+        {
+          dbg("rgbled_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+  return OK;
+}
+
+#else
+#  error "HAVE_RGBLED is undefined"
+#endif /* HAVE_RGBLED */