diff options
Diffstat (limited to 'nuttx/configs/stm3220g-eval/src/up_pwm.c')
-rw-r--r-- | nuttx/configs/stm3220g-eval/src/up_pwm.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/nuttx/configs/stm3220g-eval/src/up_pwm.c b/nuttx/configs/stm3220g-eval/src/up_pwm.c new file mode 100644 index 0000000000..c4891f71eb --- /dev/null +++ b/nuttx/configs/stm3220g-eval/src/up_pwm.c @@ -0,0 +1,120 @@ +/************************************************************************************ + * configs/stm3220g-eval/src/up_pwm.c + * arch/arm/src/board/up_pwm.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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 <arch/board/board.h> + +#include "chip.h" +#include "up_arch.h" +#include "stm32_pwm.h" +#include "stm3220g-internal.h" + +/************************************************************************************ + * Definitions + ************************************************************************************/ +/* Configuration *******************************************************************/ +/* PWM + * + * The STM3220G-Eval has no real on-board PWM devices, but the board can be + * configured to output a pulse train using variously unused pins on the board for + * PWM output (see board.h for details of pins). + */ + +#ifdef CONFIG_PWM + +/************************************************************************************ + * Private Functions + ************************************************************************************/ + +/************************************************************************************ + * Public Functions + ************************************************************************************/ + +/************************************************************************************ + * Name: pwm_devinit + * + * Description: + * All STM32 architectures must provide the following interface to work with + * examples/pwm. + * + ************************************************************************************/ + +int pwm_devinit(void) +{ + static bool initialized = false; + struct pwm_lowerhalf_s *pwm; + int ret; + + /* Have we already initialized? */ + + if (!initialized) + { + /* Call stm32_pwminitialize() to get an instance of the PWM interface */ + + pwm = stm32_pwminitialize(STM3220G_EVAL_PWMTIMER); + if (!pwm) + { + dbg("Failed to get the STM32 PWM lower half\n"); + return -ENODEV; + } + + /* 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 /* CONFIG_PWM */ |