98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/**
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**************************************************************************
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* @file at_surf_f437_board_pwm_dac.c
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* @brief the driver library of the dac
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**************************************************************************
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* Copyright notice & Disclaimer
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*
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* The software Board Support Package (BSP) that is made available to
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* download from Artery official website is the copyrighted work of Artery.
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* Artery authorizes customers to use, copy, and distribute the BSP
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* software and its related documentation for the purpose of design and
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* development in conjunction with Artery microcontrollers. Use of the
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* software is governed by this copyright notice and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
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* GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
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* TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
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* STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
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* INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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*
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**************************************************************************
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*/
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#include "at_surf_f437_board_pwm_dac.h"
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/**
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* @brief pwm dac init.
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* @param none.
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* @retval none.
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*/
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void pwm_dac_init(void)
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{
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gpio_init_type gpio_init_struct;
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tmr_output_config_type tmr_oc_init_structure;
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crm_clocks_freq_type crm_clock_freq;
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/* enable tmr3/gpioa clock */
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crm_periph_clock_enable(PWM_DAC_TMR_CLK, TRUE);
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crm_periph_clock_enable(PWM_DAC_GPIO_CLK, TRUE);
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/* timer input pin Configuration */
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gpio_init_struct.gpio_pins = PWM_DAC_GPIO_PIN;
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gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
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gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
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gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
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gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
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gpio_init(PWM_DAC_GPIO_PORT, &gpio_init_struct);
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gpio_pin_mux_config(PWM_DAC_GPIO_PORT, PWM_DAC_GPIO_PINS_SOURCE, PWM_DAC_GPIO_MUX);
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/* get the system frequency value */
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crm_clocks_freq_get(&crm_clock_freq);
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/* tmr counter mode configuration (10kHz) */
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tmr_base_init(PWM_DAC_TMRx, 1000, crm_clock_freq.apb1_freq / 10000000 * 2);
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tmr_cnt_dir_set(PWM_DAC_TMRx, TMR_COUNT_UP);
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/* configure tmr channel */
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tmr_output_default_para_init(&tmr_oc_init_structure);
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tmr_oc_init_structure.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
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tmr_oc_init_structure.oc_idle_state = FALSE;
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tmr_oc_init_structure.oc_polarity = TMR_OUTPUT_ACTIVE_HIGH;
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tmr_oc_init_structure.oc_output_state = TRUE;
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tmr_output_channel_config(PWM_DAC_TMRx, PWM_DAC_TMR_CHANNEL, &tmr_oc_init_structure);
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/* channel value set */
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tmr_channel_value_set(PWM_DAC_TMRx, PWM_DAC_TMR_CHANNEL, 0);
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/*output channel buffer enable */
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tmr_output_channel_buffer_enable(PWM_DAC_TMRx, PWM_DAC_TMR_CHANNEL, TRUE);
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/* period buffer enable */
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tmr_period_buffer_enable(PWM_DAC_TMRx, TRUE);
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/* enable pwm output */
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tmr_output_enable(PWM_DAC_TMRx, TRUE);
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/* enable tmr */
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tmr_counter_enable(PWM_DAC_TMRx, TRUE);
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}
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/**
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* @brief pwm dac output voltage set.
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* @param voltage: output voltage
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* the range is 0~3300 representing 0~3.300V.
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* @retval none.
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*/
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void pwm_dac_output_voltage_set(uint16_t voltage)
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{
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uint16_t temp;
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temp = (voltage / 3300.0) * 1000;
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tmr_channel_value_set(PWM_DAC_TMRx, PWM_DAC_TMR_CHANNEL, temp);
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}
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