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120 lines
4.1 KiB
120 lines
4.1 KiB
/************************************************************************************ |
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* configs/stm3220g-eval/src/up_pwm.c |
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* arch/arm/src/board/up_pwm.c |
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* |
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* Copyright (C) 2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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************************************************************************************/ |
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/************************************************************************************ |
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* Included Files |
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************************************************************************************/ |
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#include <nuttx/config.h> |
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#include <errno.h> |
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#include <debug.h> |
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#include <nuttx/pwm.h> |
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#include <arch/board/board.h> |
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#include "chip.h" |
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#include "up_arch.h" |
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#include "stm32_pwm.h" |
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#include "stm3220g-internal.h" |
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/************************************************************************************ |
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* Definitions |
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************************************************************************************/ |
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/* Configuration *******************************************************************/ |
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/* PWM |
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* |
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* The STM3220G-Eval has no real on-board PWM devices, but the board can be |
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* configured to output a pulse train using variously unused pins on the board for |
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* PWM output (see board.h for details of pins). |
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*/ |
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#ifdef CONFIG_PWM |
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/************************************************************************************ |
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* Private Functions |
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************************************************************************************/ |
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/************************************************************************************ |
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* Public Functions |
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************************************************************************************/ |
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/************************************************************************************ |
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* Name: pwm_devinit |
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* |
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* Description: |
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* All STM32 architectures must provide the following interface to work with |
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* examples/pwm. |
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* |
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************************************************************************************/ |
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int pwm_devinit(void) |
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{ |
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static bool initialized = false; |
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struct pwm_lowerhalf_s *pwm; |
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int ret; |
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/* Have we already initialized? */ |
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if (!initialized) |
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{ |
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/* Call stm32_pwminitialize() to get an instance of the PWM interface */ |
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pwm = stm32_pwminitialize(STM3220G_EVAL_PWMTIMER); |
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if (!pwm) |
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{ |
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dbg("Failed to get the STM32 PWM lower half\n"); |
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return -ENODEV; |
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} |
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/* Register the PWM driver at "/dev/pwm0" */ |
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ret = pwm_register("/dev/pwm0", pwm); |
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if (ret < 0) |
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{ |
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adbg("pwm_register failed: %d\n", ret); |
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return ret; |
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} |
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/* Now we are initialized */ |
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initialized = true; |
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} |
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return OK; |
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} |
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#endif /* CONFIG_PWM */
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