/**
  **************************************************************************
  * @file     main.c
  * @version  v2.0.0
  * @date     2021-11-26
  * @brief    main program
  **************************************************************************
  *                       Copyright notice & Disclaimer
  *
  * The software Board Support Package (BSP) that is made available to 
  * download from Artery official website is the copyrighted work of Artery. 
  * Artery authorizes customers to use, copy, and distribute the BSP 
  * software and its related documentation for the purpose of design and 
  * development in conjunction with Artery microcontrollers. Use of the 
  * software is governed by this copyright notice and the following disclaimer.
  *
  * THIS SOFTWARE IS PROVIDED ON "AS IS" BASIS WITHOUT WARRANTIES,
  * GUARANTEES OR REPRESENTATIONS OF ANY KIND. ARTERY EXPRESSLY DISCLAIMS,
  * TO THE FULLEST EXTENT PERMITTED BY LAW, ALL EXPRESS, IMPLIED OR
  * STATUTORY OR OTHER WARRANTIES, GUARANTEES OR REPRESENTATIONS,
  * INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  *
  **************************************************************************
  */

#include "at32f415_board.h"
#include "at32f415_clock.h"

/** @addtogroup AT32F415_periph_examples
  * @{
  */
  
/** @addtogroup 415_TMR_external_clock TMR_external_clock
  * @{
  */

gpio_init_type gpio_init_struct = {0};
crm_clocks_freq_type crm_clocks_freq_struct = {0};
tmr_output_config_type tmr_output_struct;
tmr_input_config_type tmr_input_config_struct;

/**
  * @brief  main function.
  * @param  none
  * @retval none
  */
int main(void)
{
  system_clock_config();

  at32_board_init();
  
  /* get system clock */
  crm_clocks_freq_get(&crm_clocks_freq_struct);
  
  /* turn led2/led3/led4 on */
  at32_led_on(LED2);
  at32_led_on(LED3);
  at32_led_on(LED4);
  
  /* enable tmr2/tmr3/gpioa/gpiob clock */
  crm_periph_clock_enable(CRM_TMR2_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_TMR3_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
  
  /* timer2 and timer3 output pin Configuration */
  gpio_init_struct.gpio_pins = GPIO_PINS_0;
  gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
  gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init(GPIOA, &gpio_init_struct);
  gpio_init(GPIOB, &gpio_init_struct);
  
  gpio_init_struct.gpio_pins = GPIO_PINS_7;
  gpio_init_struct.gpio_mode = GPIO_MODE_INPUT;
  gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init(GPIOA, &gpio_init_struct);

  /* use tmr2 generate clock to drive tmr3
  tmr2 pwm frequency = 144000000(systemclock)/144(period+1)/1000(div+1) = 1 khz
  tmr3 pwm frequency = 1000(tmr2 pwm frequency)/10(period+1)/1(div+1) = 100 hz */

  /* tmr2 and tmr3 counter mode configuration */
  tmr_base_init(TMR2, 143, 999);
  tmr_cnt_dir_set(TMR2, TMR_COUNT_UP);
  
  tmr_base_init(TMR3, 9, 0);
  tmr_cnt_dir_set(TMR3, TMR_COUNT_UP);
  
  /* tmr2 and tmr3 output mode configuration */
  tmr_output_default_para_init(&tmr_output_struct);
  tmr_output_struct.oc_mode = TMR_OUTPUT_CONTROL_PWM_MODE_A;
  tmr_output_struct.oc_output_state = TRUE;
  tmr_output_struct.oc_polarity = TMR_OUTPUT_ACTIVE_HIGH;
  tmr_output_struct.oc_idle_state = TRUE;
  tmr_output_struct.occ_output_state = FALSE;
  tmr_output_struct.occ_polarity = TMR_OUTPUT_ACTIVE_HIGH;
  tmr_output_struct.occ_idle_state = FALSE;
  /* tmr2 channel 1 */
  tmr_output_channel_config(TMR2, TMR_SELECT_CHANNEL_1, &tmr_output_struct);
  tmr_channel_value_set(TMR2, TMR_SELECT_CHANNEL_1, 72);
  /* tmr3 channel 3 */
  tmr_output_channel_config(TMR3, TMR_SELECT_CHANNEL_3, &tmr_output_struct);
  tmr_channel_value_set(TMR3, TMR_SELECT_CHANNEL_3, 5);
  
  /* configure tmr3 channel2 to get clock signal */
  tmr_input_config_struct.input_channel_select = TMR_SELECT_CHANNEL_2;
  tmr_input_config_struct.input_mapped_select = TMR_CC_CHANNEL_MAPPED_DIRECT;
  tmr_input_config_struct.input_polarity_select = TMR_INPUT_RISING_EDGE;
  tmr_input_channel_init(TMR3, &tmr_input_config_struct, TMR_CHANNEL_INPUT_DIV_1);
  
  /* select the tmr3 input trigger: C2IF2 */
  tmr_trigger_input_select(TMR3, TMR_SUB_INPUT_SEL_C2DF2);
  
  /* select the slave mode: external mode a */
  tmr_sub_mode_select(TMR3, TMR_SUB_EXTERNAL_CLOCK_MODE_A);

  /* enable tmr2 */
  tmr_counter_enable(TMR2, TRUE);
  
  /* enable tmr3 */
  tmr_counter_enable(TMR3, TRUE);
  
  while(1)
  {
  }
}

/**
  * @}
  */ 

/**
  * @}
  */ 
