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- /**
- * \file
- *
- * \brief SAM PWM Driver for SAMB11
- *
- * Copyright (C) 2015-2016 Atmel Corporation. All rights reserved.
- *
- * \asf_license_start
- *
- * \page License
- *
- * 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. The name of Atmel may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * 4. This software may only be redistributed and used in connection with an
- * Atmel microcontroller product.
- *
- * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
- * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
- *
- * \asf_license_stop
- *
- */
- /*
- * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
- */
- #include "pwm.h"
- #include "system_sam_b.h"
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_output_polarity(enum pwm_device_select device_select)
- {
- switch (device_select) {
- case PWM0:
- return LPMCU_MISC_REGS_PWM0_CTRL_OUTPUT_POLARITY;
- case PWM1:
- return LPMCU_MISC_REGS_PWM1_CTRL_OUTPUT_POLARITY;
- case PWM2:
- return LPMCU_MISC_REGS_PWM2_CTRL_OUTPUT_POLARITY;
- case PWM3:
- return LPMCU_MISC_REGS_PWM3_CTRL_OUTPUT_POLARITY;
- default:
- return 0;
- }
- }
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_agcdata_fmt(enum pwm_device_select device_select)
- {
- switch (device_select) {
- case PWM0:
- return LPMCU_MISC_REGS_PWM0_CTRL_AGCDATA_FMT;
- case PWM1:
- return LPMCU_MISC_REGS_PWM1_CTRL_AGCDATA_FMT;
- case PWM2:
- return LPMCU_MISC_REGS_PWM2_CTRL_AGCDATA_FMT;
- case PWM3:
- return LPMCU_MISC_REGS_PWM3_CTRL_AGCDATA_FMT;
- default:
- return 0;
- }
- }
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_sample_method(enum pwm_device_select device_select, bool value)
- {
- switch (device_select) {
- case PWM0:
- return (LPMCU_MISC_REGS_PWM0_CTRL_SAMPLE_METHOD &
- ((value) << LPMCU_MISC_REGS_PWM0_CTRL_SAMPLE_METHOD_Pos));
- case PWM1:
- return (LPMCU_MISC_REGS_PWM1_CTRL_SAMPLE_METHOD &
- ((value) << LPMCU_MISC_REGS_PWM1_CTRL_SAMPLE_METHOD_Pos));
- case PWM2:
- return (LPMCU_MISC_REGS_PWM2_CTRL_SAMPLE_METHOD &
- ((value) << LPMCU_MISC_REGS_PWM2_CTRL_SAMPLE_METHOD_Pos));
- case PWM3:
- return (LPMCU_MISC_REGS_PWM3_CTRL_SAMPLE_METHOD &
- ((value) << LPMCU_MISC_REGS_PWM3_CTRL_SAMPLE_METHOD_Pos));
- default:
- return 0;
- }
- }
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_period(enum pwm_device_select device_select, enum pwm_period value)
- {
- switch (device_select) {
- case PWM0:
- return LPMCU_MISC_REGS_PWM0_CTRL_PWM_PERIOD(value);
- case PWM1:
- return LPMCU_MISC_REGS_PWM1_CTRL_PWM_PERIOD(value);
- case PWM2:
- return LPMCU_MISC_REGS_PWM2_CTRL_PWM_PERIOD(value);
- case PWM3:
- return LPMCU_MISC_REGS_PWM3_CTRL_PWM_PERIOD(value);
- default:
- return 0;
- }
- }
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_agcdata_in(
- enum pwm_device_select device_select, \
- bool agcdata_format, \
- uint8_t duty_cycle)
- {
- int32_t agcdata_in;
- if (agcdata_format) {
- agcdata_in = (uint16_t)((1024 * duty_cycle) / 100);
- } else {
- agcdata_in = (int16_t)((1024 * duty_cycle) / 100 - 512);
- }
- switch (device_select) {
- case PWM0:
- return LPMCU_MISC_REGS_PWM0_CTRL_AGCDATA_IN(agcdata_in);
- case PWM1:
- return LPMCU_MISC_REGS_PWM1_CTRL_AGCDATA_IN(agcdata_in);
- case PWM2:
- return LPMCU_MISC_REGS_PWM2_CTRL_AGCDATA_IN(agcdata_in);
- case PWM3:
- return LPMCU_MISC_REGS_PWM3_CTRL_AGCDATA_IN(agcdata_in);
- default:
- return 0;
- }
- }
- /**
- * \internal Get the register configuration values by PWM device
- */
- static uint32_t _pwm_reg_clock_sel(enum pwm_device_select device_select, enum pwm_clock_select value)
- {
- switch (device_select) {
- case PWM0:
- return LPMCU_MISC_REGS_PWM0_CTRL_CLOCK_SEL(value);
- case PWM1:
- return LPMCU_MISC_REGS_PWM1_CTRL_CLOCK_SEL(value);
- case PWM2:
- return LPMCU_MISC_REGS_PWM2_CTRL_CLOCK_SEL(value);
- case PWM3:
- return LPMCU_MISC_REGS_PWM3_CTRL_CLOCK_SEL(value);
- default:
- return 0;
- }
- }
- /**
- * \brief Initializes a pwm configuration structure to defaults.
- *
- * Initializes a given pwm configuration structure to a set of
- * known default values. This function should be called on all new
- * instances of these configuration structures before being modified by the
- * user application.
- *
- * The default configuration is as follows:
- * \li Not to inverse the polarity
- * \li Sample method 0
- * \li PWM period is 4
- * \li Duty cycle is 50%
- * \li Clock is 26MHz
- * \li Output frequency is 25.4KHz
- * \li Pinmux pad
- *
- * \param[out] config Configuration structure to initialize to default values
- */
- void pwm_get_config_defaults(struct pwm_config *const config)
- {
- config->output_polarity = false;
- config->agcdata_format = false;
- config->sample_method = PWM_SAMPLE_METHOD_0;
- config->period = PWM_PERIOD_4;
- config->duty_cycle = 50;
- config->clock_select = PWM_CLOCK_SELECT_26_0;
- config->pin_number_pad = 0;
- config->pinmux_sel_pad = 0;
- }
- /**
- * \brief Set the duty cycle of the PWM module.
- *
- * This function will set the duty cycle of the PWM module, based on the values
- * of setting.
- *
- * \param[in] device_select PWM device
- * \param[in] duty_cycle This value specifies the duty cycle(%)
- */
- void pwm_set_duty_cycle(enum pwm_device_select device_select, \
- uint8_t duty_cycle)
- {
- bool agcdata_format;
- uint32_t temp;
- switch(device_select) {
- case PWM0:
- agcdata_format = LPMCU_MISC_REGS0->PWM0_CTRL.bit.AGCDATA_FMT;
- temp = LPMCU_MISC_REGS0->PWM0_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM0_CTRL_AGCDATA_IN_Msk;
- temp |= _pwm_reg_agcdata_in(device_select, agcdata_format, duty_cycle);
- LPMCU_MISC_REGS0->PWM0_CTRL.reg = temp;
- break;
- case PWM1:
- agcdata_format = LPMCU_MISC_REGS0->PWM1_CTRL.bit.AGCDATA_FMT;
- temp = LPMCU_MISC_REGS0->PWM1_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM1_CTRL_AGCDATA_IN_Msk;
- temp |= _pwm_reg_agcdata_in(device_select, agcdata_format, duty_cycle);
- LPMCU_MISC_REGS0->PWM1_CTRL.reg = temp;
- break;
- case PWM2:
- agcdata_format = LPMCU_MISC_REGS0->PWM2_CTRL.bit.AGCDATA_FMT;
- temp = LPMCU_MISC_REGS0->PWM2_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM2_CTRL_AGCDATA_IN_Msk;
- temp |= _pwm_reg_agcdata_in(device_select, agcdata_format, duty_cycle);
- LPMCU_MISC_REGS0->PWM2_CTRL.reg = temp;
- break;
- case PWM3:
- agcdata_format = LPMCU_MISC_REGS0->PWM3_CTRL.bit.AGCDATA_FMT;
- temp = LPMCU_MISC_REGS0->PWM3_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM3_CTRL_AGCDATA_IN_Msk;
- temp |= _pwm_reg_agcdata_in(device_select, agcdata_format, duty_cycle);
- LPMCU_MISC_REGS0->PWM3_CTRL.reg = temp;
- break;
- }
- }
- /**
- * \brief Set the period of the PWM module.
- *
- * This function will set the frequence of the PWM module, based on the values
- * of setting period.
- *
- * \param[in] device_select PWM device
- * \param[in] period Programmable PWM update period
- */
- void pwm_set_period(enum pwm_device_select device_select, \
- enum pwm_period period)
- {
- uint32_t reg_value;
- uint32_t temp;
- if (period > PWM_PERIOD_8) {
- reg_value = PWM_PERIOD_4;
- }
- reg_value = _pwm_reg_period(device_select, period);
- switch(device_select) {
- case PWM0:
- temp = LPMCU_MISC_REGS0->PWM0_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM0_CTRL_PWM_PERIOD_Msk;
- temp |= reg_value;
- LPMCU_MISC_REGS0->PWM0_CTRL.reg = temp;
- break;
- case PWM1:
- temp = LPMCU_MISC_REGS0->PWM1_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM1_CTRL_PWM_PERIOD_Msk;
- temp |= reg_value;
- LPMCU_MISC_REGS0->PWM1_CTRL.reg = temp;
- break;
- case PWM2:
- temp = LPMCU_MISC_REGS0->PWM2_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM2_CTRL_PWM_PERIOD_Msk;
- temp |= reg_value;
- LPMCU_MISC_REGS0->PWM2_CTRL.reg = temp;
- break;
- case PWM3:
- temp = LPMCU_MISC_REGS0->PWM3_CTRL.reg;
- temp &= ~LPMCU_MISC_REGS_PWM3_CTRL_PWM_PERIOD_Msk;
- temp |= reg_value;
- LPMCU_MISC_REGS0->PWM3_CTRL.reg = temp;
- break;
- }
- }
- /**
- * \brief Initializes the PWM module
- *
- * This function will initialize the PWM module, based on the values
- * of the config struct.
- *
- * \param[in] device_select PWM device
- * \param[in] config Pointer to the config struct
- *
- * \return The status of the configuration.
- * \retval STATUS_ERR_UNSUPPORTED_DEV If unsupported device were provided
- * \retval STATUS_OK If the configuration was written
- */
- enum status_code pwm_init(enum pwm_device_select device_select, \
- const struct pwm_config *const config)
- {
- uint32_t reg_value = 0;
- if (device_select > PWM3) {
- return STATUS_ERR_UNSUPPORTED_DEV;
- }
- if (config->output_polarity) {
- reg_value |= _pwm_reg_output_polarity(device_select);
- }
- if (config->agcdata_format) {
- reg_value |= _pwm_reg_agcdata_fmt(device_select);
- }
- reg_value |= _pwm_reg_sample_method(device_select, config->sample_method);
- /* If period > 8 will be set to 4 as default. */
- if (config->period > PWM_PERIOD_8) {
- reg_value |= _pwm_reg_period(device_select, PWM_PERIOD_4);
- } else {
- reg_value |= _pwm_reg_period(device_select, config->period);
- }
- reg_value |= _pwm_reg_agcdata_in(device_select, config->agcdata_format, \
- config->duty_cycle);
- reg_value |= _pwm_reg_clock_sel(device_select, config->clock_select);
- switch(device_select) {
- case PWM0:
- LPMCU_MISC_REGS0->PWM0_CTRL.reg = reg_value;
- break;
- case PWM1:
- LPMCU_MISC_REGS0->PWM1_CTRL.reg = reg_value;
- break;
- case PWM2:
- LPMCU_MISC_REGS0->PWM2_CTRL.reg = reg_value;
- break;
- case PWM3:
- LPMCU_MISC_REGS0->PWM3_CTRL.reg = reg_value;
- break;
- }
- struct gpio_config config_gpio;
- gpio_get_config_defaults(&config_gpio);
- config_gpio.direction = GPIO_PIN_DIR_OUTPUT;
- gpio_pin_set_config(config->pin_number_pad, &config_gpio);
- gpio_pinmux_cofiguration(config->pin_number_pad, \
- (uint16_t)(config->pinmux_sel_pad));
- return STATUS_OK;
- }
- /**
- * \brief Enables the PWM module
- *
- * This function will enable the PWM module.
- *
- * \param[in] device_select PWM device
- */
- void pwm_enable(enum pwm_device_select device_select)
- {
- switch (device_select) {
- case PWM0:
- system_clock_peripheral_enable(PERIPHERAL_PWM0);
- LPMCU_MISC_REGS0->PWM0_CTRL.reg |= LPMCU_MISC_REGS_PWM0_CTRL_PWM_EN;
- break;
- case PWM1:
- system_clock_peripheral_enable(PERIPHERAL_PWM1);
- LPMCU_MISC_REGS0->PWM1_CTRL.reg |= LPMCU_MISC_REGS_PWM1_CTRL_PWM_EN;
- break;
- case PWM2:
- system_clock_peripheral_enable(PERIPHERAL_PWM2);
- LPMCU_MISC_REGS0->PWM2_CTRL.reg |= LPMCU_MISC_REGS_PWM2_CTRL_PWM_EN;
- break;
- case PWM3:
- system_clock_peripheral_enable(PERIPHERAL_PWM3);
- LPMCU_MISC_REGS0->PWM3_CTRL.reg |= LPMCU_MISC_REGS_PWM3_CTRL_PWM_EN;
- break;
- }
- }
- /**
- * \brief Disable the PWM module
- *
- * This function will disable the PWM module.
- *
- * \param[in] device_select PWM device
- */
- void pwm_disable(enum pwm_device_select device_select)
- {
- switch (device_select) {
- case PWM0:
- system_clock_peripheral_disable(PERIPHERAL_PWM0);
- LPMCU_MISC_REGS0->PWM0_CTRL.reg &= ~LPMCU_MISC_REGS_PWM0_CTRL_PWM_EN;
- break;
- case PWM1:
- system_clock_peripheral_disable(PERIPHERAL_PWM1);
- LPMCU_MISC_REGS0->PWM1_CTRL.reg &= ~LPMCU_MISC_REGS_PWM1_CTRL_PWM_EN;
- break;
- case PWM2:
- system_clock_peripheral_disable(PERIPHERAL_PWM2);
- LPMCU_MISC_REGS0->PWM2_CTRL.reg &= ~LPMCU_MISC_REGS_PWM2_CTRL_PWM_EN;
- break;
- case PWM3:
- system_clock_peripheral_disable(PERIPHERAL_PWM3);
- LPMCU_MISC_REGS0->PWM3_CTRL.reg &= ~LPMCU_MISC_REGS_PWM3_CTRL_PWM_EN;
- break;
- }
- }
- /**
- * \brief Reset the PWM module
- *
- * This function will reset the PWM module.
- *
- * \param[in] device_select PWM device
- */
- void pwm_reset(enum pwm_device_select device_select)
- {
- switch (device_select) {
- case PWM0:
- system_peripheral_reset(PERIPHERAL_PWM0);
- break;
- case PWM1:
- system_peripheral_reset(PERIPHERAL_PWM1);
- break;
- case PWM2:
- system_peripheral_reset(PERIPHERAL_PWM2);
- break;
- case PWM3:
- system_peripheral_reset(PERIPHERAL_PWM3);
- break;
- }
- }
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