diff options
Diffstat (limited to 'nuttx/configs/stm3240g-eval/src/up_pwm.c')
| -rw-r--r-- | nuttx/configs/stm3240g-eval/src/up_pwm.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/nuttx/configs/stm3240g-eval/src/up_pwm.c b/nuttx/configs/stm3240g-eval/src/up_pwm.c index 503e26073..d0701b2b2 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 */ |