/*
 * Copyright (C) 2020-2025 Roger Clark, VK3KYY / G4KYF
 *
 *
 * 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 of the copyright holder nor the names of its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. Use of this source code or binary releases for commercial purposes is strictly forbidden. This includes, without limitation,
 *    incorporation in a commercial product or incorporation into a product or project which allows commercial use.
 *
 * 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
 * HOLDER 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.
 *
 */
#include "stm32f4xx_hal.h"
#include "main.h"
#include "interfaces/gpio.h"
#include <stdint.h>

// use 100 + 1 elements so that we can achieve 100% by putting the reset pattern beyond the end of the DMA loop range
#define dimingTableSize  101U
uint32_t dimingPattern[dimingTableSize];

static uint8_t currentDisplayPercentage = 0;

#if 0
void gpioInitButtons(void)
{
}

void gpioInitCommon(void)
{
}
#endif

void gpioInitDisplay(void)
{
	HAL_TIM_Base_Start(&htim1);
	HAL_TIM_OC_Start(&htim1, TIM_CHANNEL_1);
	__HAL_TIM_ENABLE_DMA(&htim1, TIM_DMA_CC1);
}

void gpioSetDisplayBacklightIntensityPercentage(uint8_t intensityPercentage)
{
	if (intensityPercentage > 100U)
	{
		intensityPercentage = 100U;
	}

	if (intensityPercentage == currentDisplayPercentage)
	{
		return;
	}

	// Switching from dimmed to 100% or 0% value. Stop the DMA
	if ((intensityPercentage == 100U) || (intensityPercentage == 0U))
	{
		HAL_DMA_Abort(&hdma_tim1_ch1); // kill the DMA

		HAL_GPIO_WritePin(LCD_BKLIGHT_GPIO_Port, LCD_BKLIGHT_Pin, ((intensityPercentage == 100U) ? GPIO_PIN_SET : GPIO_PIN_RESET));
	}
	else
	{
		// Changing from 100% or 0% to dimmed value. So run the DMA
		if ((currentDisplayPercentage == 100U) || (currentDisplayPercentage == 0U))
		{
			HAL_DMA_Start(&hdma_tim1_ch1, (uint32_t)dimingPattern, (uint32_t)&(LCD_BKLIGHT_GPIO_Port->BSRR), 100U);// 100 steps
		}
		//HAL_GPIO_WritePin(LCD_BKLIGHT_GPIO_Port, LCD_BKLIGHT_Pin, GPIO_PIN_RESET);
	}

	dimingPattern[currentDisplayPercentage] = 0U;// remove the previous pin reset pattern

	dimingPattern[0U] = LCD_BKLIGHT_Pin;// turn on the backlight at the start of the array
	dimingPattern[intensityPercentage] = (uint32_t)LCD_BKLIGHT_Pin << 16U;// Turn off the pin at the appropriate position in the array
	currentDisplayPercentage = intensityPercentage;
}

uint8_t gpioGetDisplayBacklightIntensityPercentage(void)
{
	return currentDisplayPercentage;
}

#if 0
void gpioInitFlash(void)
{
}
#endif

void gpioInitKeyboard(void)
{
}

void gpioInitLEDs(void)
{
}

void gpioInitRotarySwitch(void)
{
// config is via the STM32Cube config tool
}

#if 0
void gpioInitC6000Interface(void)
{
}
#endif