| /**************************************************************************** |
| * boards/arm/sama5/giant-board/src/sam_pwm.c |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <sys/types.h> |
| #include <errno.h> |
| #include <debug.h> |
| |
| #include <nuttx/board.h> |
| #include <nuttx/timers/pwm.h> |
| |
| #include <arch/board/board.h> |
| |
| #include "sam_pwm.h" |
| #include "giant-board.h" |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| /* Configuration ************************************************************/ |
| |
| /* PWM. |
| * There are no dedicated PWM output pins available to the user for PWM |
| * testing. |
| * Care must be taken because all PWM output pins conflict with some other |
| * usage of the pin by other devices: |
| * |
| * -----+---+---+----+-------------------- |
| * PWM PIN PER PIO CONFLICTS |
| * -----+---+---+----+-------------------- |
| * PWM0 FI B PC28 SPI1, ISI |
| * H B PB0 GMAC |
| * B PA20 LCDC, ISI |
| * L B PB1 GMAC |
| * B PA21 LCDC, ISI |
| * -----+---+---+----+-------------------- |
| * PWM1 FI B PC31 HDMI |
| * H B PB4 GMAC |
| * B PA22 LCDC, ISI |
| * L B PB5 GMAC |
| * B PE31 ISI, HDMI |
| * B PA23 LCDC, ISI |
| * -----+---+---+----+-------------------- |
| * PWM2 FI B PC29 UART0, ISI, HDMI |
| * H C PD5 HSMCI0 |
| * B PB8 GMAC |
| * L C PD6 HSMCI0 |
| * B PB9 GMAC |
| * -----+---+---+----+-------------------- |
| * PWM3 FI C PD16 SPI0, Audio |
| * H C PD7 HSMCI0 |
| * B PB12 GMAC |
| * L C PD8 HSMCI0 |
| * B PB13 GMAC |
| * -----+---+---+----+-------------------- |
| */ |
| |
| #ifndef CONFIG_GIANT_BOARD_CHANNEL |
| # if defined(CONFIG_SAMA5_PWM_CHAN0) |
| # warning Assuming PWM channel 0 |
| # define CONFIG_GIANT_BOARD_CHANNEL 0 |
| # elif defined(CONFIG_SAMA5_PWM_CHAN1) |
| # warning Assuming PWM channel 1 |
| # define CONFIG_GIANT_BOARD_CHANNEL 1 |
| # elif defined(CONFIG_SAMA5_PWM_CHAN2) |
| # warning Assuming PWM channel 2 |
| # define CONFIG_GIANT_BOARD_CHANNEL 2 |
| # elif defined(CONFIG_SAMA5_PWM_CHAN3) |
| # warning Assuming PWM channel 3 |
| # define CONFIG_GIANT_BOARD_CHANNEL 3 |
| # endif |
| #endif |
| |
| #if defined(CONFIG_PWM) && defined(CONFIG_SAMA5_PWM) |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: sam_pwm_setup |
| * |
| * Description: |
| * Initialize PWM and register the PWM device. |
| * |
| ****************************************************************************/ |
| |
| int sam_pwm_setup(void) |
| { |
| static bool initialized = false; |
| struct pwm_lowerhalf_s *pwm; |
| int ret; |
| |
| /* Have we already initialized? */ |
| |
| if (!initialized) |
| { |
| /* Call sam_pwminitialize() to get an instance of the PWM interface */ |
| |
| pwm = sam_pwminitialize(CONFIG_SAMA5D3XPLAINED_CHANNEL); |
| if (!pwm) |
| { |
| _err("ERROR: Failed to get the SAMA5 PWM lower half\n"); |
| return -ENODEV; |
| } |
| |
| /* Register the PWM driver at "/dev/pwm0" */ |
| |
| ret = pwm_register("/dev/pwm0", pwm); |
| if (ret < 0) |
| { |
| aerr("ERROR: pwm_register failed: %d\n", ret); |
| return ret; |
| } |
| |
| /* Now we are initialized */ |
| |
| initialized = true; |
| } |
| |
| return OK; |
| } |
| |
| #endif /* CONFIG_PWM */ |
