PWM driver works

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4205 7fd9a85b-ad96-42d3-883c-3090e2eb8679

2 files changed, 32 insertions, 14 deletions

diff --git a/nuttx/configs/stm3240g-eval/src/stm3240g-internal.h b/nuttx/configs/stm3240g-eval/src/stm3240g-internal.h
index 4158311912..0ccdaf40a3 100644
--- a/nuttx/configs/stm3240g-eval/src/stm3240g-internal.h
+++ b/nuttx/configs/stm3240g-eval/src/stm3240g-internal.h
@@ -90,9 +90,13 @@
  * a pulse train using TIM4 CH2.  This pin is used by FSMC is connect to CN5 just for this
  * purpose:
  *
- * PD13 FSMC_A18 / MC_TIM4_CH2 pin 33 (EnB)
+ *   PD13 FSMC_A18 / MC_TIM4_CH2 pin 33 (EnB)
  *
- * FSMC must be disabled in this case!
+ * FSMC must be disabled in this case!  PD13 is available at:
+ *
+ *   Daughterboard Extension Connector, CN3, pin 32 - available
+ *   TFT LCD Connector, CN19, pin 17 -- not available without removing the LCD.
+ *   Motor Control Connector CN15, pin 33 -- no available unless to connect SB14.
  */
 
 #define STM3240G_EVAL_PWMTIMER   4
diff --git a/nuttx/configs/stm3240g-eval/src/up_pwm.c b/nuttx/configs/stm3240g-eval/src/up_pwm.c
index 503e260733..d0701b2b29 100644
--- a/nuttx/configs/stm3240g-eval/src/up_pwm.c
+++ b/nuttx/configs/stm3240g-eval/src/up_pwm.c
@@ -40,6 +40,7 @@
 
 #include <nuttx/config.h>
 
+#include <errno.h>
 #include <debug.h>
 
 #include <nuttx/pwm.h>
@@ -102,27 +103,40 @@
  *
  ************************************************************************************/
 
-void pwm_devinit(void)
+int pwm_devinit(void)
 {
+  static bool initialized = false;
   struct pwm_lowerhalf_s *pwm;
   int ret;
 
-  /* Call stm32_pwminitialize() to get an instance of the PWM interface */
+  /* Have we already initialized? */
 
-  pwm = stm32_pwminitialize(STM3240G_EVAL_PWMTIMER);
-  if (!pwm)
+  if (!initialized)
     {
-      dbg("Failed to get the STM32 PWM lower half\n");
-      return;
-    }
+      /* Call stm32_pwminitialize() to get an instance of the PWM interface */
 
-  /* Register the PWM driver at "/dev/pwm0" */
+      pwm = stm32_pwminitialize(STM3240G_EVAL_PWMTIMER);
+      if (!pwm)
+        {
+          dbg("Failed to get the STM32 PWM lower half\n");
+          return -ENODEV;
+        }
 
-  ret = pwm_register("/dev/pwm0", pwm);
-  if (ret < 0)
-    {
-      adbg("pwm_register failed: %d\n", ret);
+      /* Register the PWM driver at "/dev/pwm0" */
+
+      ret = pwm_register("/dev/pwm0", pwm);
+      if (ret < 0)
+        {
+          adbg("pwm_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
     }
+
+  return OK;
 }
 
 #endif /* HAVE_PWM */