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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-02-06 22:30:57 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2013-02-06 22:30:57 +0000 |
commit | ceef9e3bece69f86e585b3bf00e5009551350e2b (patch) | |
tree | 37ceee5fa56d32692bc5c804444ab9b78a5d1e61 /nuttx/configs/stm32f3discovery/src/up_pwm.c | |
parent | f7b7532a4114b831f5ef66ed992d28e65fb3973f (diff) | |
download | px4-nuttx-ceef9e3bece69f86e585b3bf00e5009551350e2b.tar.gz px4-nuttx-ceef9e3bece69f86e585b3bf00e5009551350e2b.tar.bz2 px4-nuttx-ceef9e3bece69f86e585b3bf00e5009551350e2b.zip |
Beginnings of support for the STM32F3Discovery board
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5616 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/configs/stm32f3discovery/src/up_pwm.c')
-rw-r--r-- | nuttx/configs/stm32f3discovery/src/up_pwm.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/nuttx/configs/stm32f3discovery/src/up_pwm.c b/nuttx/configs/stm32f3discovery/src/up_pwm.c new file mode 100644 index 000000000..3c7fe0772 --- /dev/null +++ b/nuttx/configs/stm32f3discovery/src/up_pwm.c @@ -0,0 +1,142 @@ +/************************************************************************************ + * configs/stm32f3discovery/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 "stm32f3discovery-internal.h" + +/************************************************************************************ + * Definitions + ************************************************************************************/ +/* Configuration *******************************************************************/ +/* PWM + * + * The stm32f3discovery has no real on-board PWM devices, but the board can be configured to output + * 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_CH2OUT pin 33 (EnB) + * + * FSMC must be disabled in this case! + */ + +#define HAVE_PWM 1 + +#ifndef CONFIG_PWM +# undef HAVE_PWM +#endif + +#ifndef CONFIG_STM32_TIM4 +# undef HAVE_PWM +#endif + +#ifndef CONFIG_STM32_TIM4_PWM +# undef HAVE_PWM +#endif + +#if CONFIG_STM32_TIM4_CHANNEL != STM32F3DISCOVERY_PWMCHANNEL +# undef HAVE_PWM +#endif + +#ifdef HAVE_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(STM32F3DISCOVERY_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 /* HAVE_PWM */ |