/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 ** This notice applies to any and all portions of this file
 * that are not between comment pairs USER CODE BEGIN and
 * USER CODE END. Other portions of this file, whether
 * inserted by the user or by software development tools
 * are owned by their respective copyright owners.
 *
 * COPYRIGHT(c) 2019 STMicroelectronics
 *
 * 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 STMicroelectronics nor the names of its contributors
 *      may be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * 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.
 *
 ******************************************************************************
 */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define BUF_SIZE 256
#define BUF_DATA_SIZE 512

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;
UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */
volatile uint16_t Buf_Data[BUF_DATA_SIZE];

volatile uint8_t Buf_Rx[BUF_SIZE];
volatile uint8_t Buf_Tx[BUF_SIZE];
volatile uint8_t Busy_Rx = 0, Empty_Rx = 0, Busy_Tx = 0, Empty_Tx = 0;
volatile uint8_t temp = 0;
volatile uint8_t endFrameDetected = 0;

volatile uint8_t tryb;
volatile uint8_t pomiar;
volatile uint8_t tick;
volatile uint8_t dataIndex;

volatile float voltage;
volatile float avg;

struct ring_buffer *buffer;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_ADC1_Init(void);

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
	if (huart->Instance == USART2) {
		Empty_Rx++;
		if (Buf_Rx[Empty_Rx - 1] == ';') {
			endFrameDetected = 1;
		}
		if (Empty_Rx >= BUF_SIZE) {
			Empty_Rx = 0;
		}
	}
	HAL_UART_Receive_IT(&huart2, &Buf_Rx[Empty_Rx], 1);
}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {
	if (huart->Instance == USART2) {
		if (Busy_Tx != Empty_Tx) {
			temp = Buf_Tx[Busy_Tx];
			Busy_Tx++;
			if (Busy_Tx >= BUF_SIZE) {
				Busy_Tx = 0;
			}
			HAL_UART_Transmit_IT(&huart2, &temp, 1);
		}
	}
}

void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc1) {
//	dataIndex = 0;
	if (tick == 1) {
		uint8_t data[20];
		if (tryb == 0 && pomiar == 1) {
			for (uint16_t i = 0; i < 255; i++) {
				voltage = Buf_Data[i] * 3.3f / 4095.0f;
				avg += voltage;
			}
			avg /= 256;

			sprintf(data, "ADC = %.3fV", avg);
			tick = 0;
			frame_send(data, 12);
			avg = 0;
		}
	}
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc1) {
//	dataIndex = 255;
	if (tick == 1) {
		uint8_t data[20];
		if (tryb == 0 && pomiar == 1) {
			for (uint16_t i = 0; i < 255; i++) {
				voltage = Buf_Data[i] * 3.3f / 4095.0f;
				avg += voltage;
			}
			avg /= 256;

			sprintf(data, "ADC = %.3fV", avg);
			tick = 0;
			frame_send(data, 12);
			avg = 0;
		}
	}
}

/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
unsigned char crc8(unsigned char poly, unsigned char* data, int size) {
	unsigned char crc = 0x00;
	int bit;

	while (size--) {
		crc ^= *data++;
		for (bit = 0; bit < 8; bit++) {
			if (crc & 0x80) {
				crc = (crc << 1) ^ poly;
			} else {
				crc <<= 1;
			}
		}
	}
	return crc;
}

void frame_decoder() {
	char frame_buffer[255];
	char frame[127];
	char frame_escape[127];
	uint8_t i = 0;
	while (Busy_Rx != Empty_Rx) {
		frame_buffer[i++] = Buf_Rx[Busy_Rx++];
		if (Busy_Rx >= BUF_SIZE) {
			Busy_Rx = 0;
		}
	}

	// poczatek ramki
	uint8_t k = 0;
	uint8_t startDetected = 0;
	for (uint8_t j = 0; j < i; j++) {
		if (frame_buffer[j] == ':') { // szukam znaku startu ramki
			startDetected = 1;
			k = 0;
		} else if (startDetected == 1) {
			frame[k++] = frame_buffer[j];
		}
	}
	if (startDetected != 0) {
		//deescapowanie ramki
		uint8_t m = 0;
		uint8_t escapeFlag = 0;
		for (uint8_t l = 0; l < k; l++) {
			if (frame[l] == 0x3F) {
				escapeFlag = 1;
			} else if (escapeFlag == 0) {
				frame_escape[m++] = frame[l];
			} else {
				escapeFlag = 0;
				frame_escape[m++] = frame[l] ^ 0x20;
			}
		}

		// sprawdzam czy ramka nie jest za mała i za duża
		if (m > 2 && m < 126) {
			uint8_t checksum = frame_escape[m - 2];
			char dane[127];
			uint8_t n = 0;
			for (uint8_t o = 0; o < m - 2; o++) {
				dane[n++] = frame_escape[o];
			}

			execute_command(dane);
		}
	}
}

void frame_send(uint8_t *senddata, uint8_t length) {
	uint8_t frame[128];
	uint8_t i;
	for (i = 0; i < length; i++) {
		frame[i] = senddata[i];
	}
	frame[length] = crc8(0x77, frame, length); //crc

	uint8_t frame_escape[128];
	uint8_t m = 1;
	frame_escape[0] = ':';
	for (uint8_t l = 0; l < length + 1; l++) {
		if (frame[l] == 0x3A || frame[l] == 0x3B || frame[l] == 0x3F) {
			frame_escape[m++] = 0x3F;
			frame_escape[m++] = frame[l] ^ 0x20;
		} else {
			frame_escape[m++] = frame[l];
		}
	}

	frame_escape[m + 1] = ';';
	uint8_t idx = Empty_Tx;
	for (int i = 0; i < m + 1; i++) {
		Buf_Tx[idx] = frame_escape[i];
		idx++;
		if (idx > 255) {
			idx = 0;
		}
	}
	__disable_irq();

	if (Busy_Tx == Empty_Tx
			&& __HAL_UART_GET_FLAG(&huart2, UART_FLAG_TXE) == SET) {
		Empty_Tx = idx;
		temp = Buf_Tx[Busy_Tx];
		Busy_Tx++;
		if (Busy_Tx > 255) {
			Busy_Tx = 0;
		}
		HAL_UART_Transmit_IT(&huart2, &temp, 1);
	} else {
		Empty_Tx = idx;
	}
	__enable_irq();
}

void execute_command(char *data_in) {
	if (strncmp("pomiardc", data_in, 8) == 0) {
		tryb = 0;
		pomiar = 1;
		frame_send("OK", 2);
	} else if (strncmp("pomiarpeak", data_in, 10) == 0) {
		tryb = 1;
		pomiar = 1;
		frame_send("OK", 2);
	} else if (strncmp("pomiarrms", data_in, 9) == 0) {
		tryb = 2;
		pomiar = 1;
		frame_send("OK", 2);
	} else if (strncmp("stop", data_in, 4) == 0) {
		pomiar = 0;
		frame_send("stopped", 8);
	} else {
		frame_send("unknown command", 15);
	}
}

void send(char *format, ...) {
	uint8_t buffer[256];
	uint8_t idx = Empty_Tx;
	va_list argList;
	va_start(argList, format);
	vsprintf(buffer, format, argList);
	va_end(argList);

	for (int i = 0; i < strlen(buffer); i++) {
		Buf_Tx[idx] = buffer[i];
		idx++;
		if (idx > 255) {
			idx = 0;
		}
	}
	__disable_irq();

	if (Busy_Tx == Empty_Tx
			&& __HAL_UART_GET_FLAG(&huart2, UART_FLAG_TXE) == SET) {
		Empty_Tx = idx;
		temp = Buf_Tx[Busy_Tx];
		Busy_Tx++;
		if (Busy_Tx > 255) {
			Busy_Tx = 0;
		}
		HAL_UART_Transmit_IT(&huart2, &temp, 1);
	} else {
		Empty_Tx = idx;
	}
	__enable_irq();
}

void send_hello() {
	send("I am working!\n\r");
}

/* USER CODE END 0 */

/**
 * @brief  The application entry point.
 * @retval int
 */
int main(void) {
	/* USER CODE BEGIN 1 */
	/* USER CODE END 1 */

	/* MCU Configuration--------------------------------------------------------*/

	/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
	HAL_Init();

	/* USER CODE BEGIN Init */

	/* USER CODE END Init */

	/* Configure the system clock */
	SystemClock_Config();

	/* USER CODE BEGIN SysInit */

	/* USER CODE END SysInit */

	/* Initialize all configured peripherals */
	MX_GPIO_Init();
	MX_DMA_Init();
	MX_USART2_UART_Init();
	MX_ADC1_Init();

	/* USER CODE BEGIN 2 */
	HAL_ADC_Start_DMA(&hadc1, (uint16_t*) Buf_Data, 512);
	send_hello();
	HAL_UART_Receive_IT(&huart2, &Buf_Rx[Empty_Rx], 1);
	/* USER CODE END 2 */

	/* Infinite loop */
	/* USER CODE BEGIN WHILE */
	while (1) {

		/* USER CODE END WHILE */
		if (endFrameDetected) {
			endFrameDetected = 0;
			frame_decoder();
		}
		/* USER CODE BEGIN 3 */
	}
	/* USER CODE END 3 */
}

/**
 * @brief System Clock Configuration
 * @retval None
 */
void SystemClock_Config(void) {
	RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
	RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
	RCC_PeriphCLKInitTypeDef PeriphClkInit = { 0 };

	/**Initializes the CPU, AHB and APB busses clocks
	 */
	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
	RCC_OscInitStruct.HSIState = RCC_HSI_ON;
	RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
	if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
		Error_Handler();
	}
	/**Initializes the CPU, AHB and APB busses clocks
	 */
	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
			| RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) {
		Error_Handler();
	}
	PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
	PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV2;
	if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
		Error_Handler();
	}
}

/**
 * @brief ADC1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_ADC1_Init(void) {

	/* USER CODE BEGIN ADC1_Init 0 */

	/* USER CODE END ADC1_Init 0 */

	ADC_ChannelConfTypeDef sConfig = { 0 };

	/* USER CODE BEGIN ADC1_Init 1 */

	/* USER CODE END ADC1_Init 1 */
	/**Common config
	 */
	hadc1.Instance = ADC1;
	hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
	hadc1.Init.ContinuousConvMode = ENABLE;
	hadc1.Init.DiscontinuousConvMode = DISABLE;
	hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
	hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
	hadc1.Init.NbrOfConversion = 1;
	if (HAL_ADC_Init(&hadc1) != HAL_OK) {
		Error_Handler();
	}
	/**Configure Regular Channel
	 */
	sConfig.Channel = ADC_CHANNEL_0;
	sConfig.Rank = ADC_REGULAR_RANK_1;
	sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
	if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {
		Error_Handler();
	}
	/* USER CODE BEGIN ADC1_Init 2 */

	/* USER CODE END ADC1_Init 2 */

}

/**
 * @brief USART2 Initialization Function
 * @param None
 * @retval None
 */
static void MX_USART2_UART_Init(void) {

	/* USER CODE BEGIN USART2_Init 0 */

	/* USER CODE END USART2_Init 0 */

	/* USER CODE BEGIN USART2_Init 1 */

	/* USER CODE END USART2_Init 1 */
	huart2.Instance = USART2;
	huart2.Init.BaudRate = 9600;
	huart2.Init.WordLength = UART_WORDLENGTH_8B;
	huart2.Init.StopBits = UART_STOPBITS_1;
	huart2.Init.Parity = UART_PARITY_NONE;
	huart2.Init.Mode = UART_MODE_TX_RX;
	huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
	huart2.Init.OverSampling = UART_OVERSAMPLING_16;
	if (HAL_UART_Init(&huart2) != HAL_OK) {
		Error_Handler();
	}
	/* USER CODE BEGIN USART2_Init 2 */

	/* USER CODE END USART2_Init 2 */

}

/**
 * Enable DMA controller clock
 */
static void MX_DMA_Init(void) {
	/* DMA controller clock enable */
	__HAL_RCC_DMA1_CLK_ENABLE()
	;

	/* DMA interrupt init */
	/* DMA1_Channel1_IRQn interrupt configuration */
	HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);

}

/**
 * @brief GPIO Initialization Function
 * @param None
 * @retval None
 */
static void MX_GPIO_Init(void) {
	GPIO_InitTypeDef GPIO_InitStruct = { 0 };

	/* GPIO Ports Clock Enable */
	__HAL_RCC_GPIOA_CLK_ENABLE()
	;

	/*Configure GPIO pin Output Level */
	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);

	/*Configure GPIO pin : PA5 */
	GPIO_InitStruct.Pin = GPIO_PIN_5;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
 * @brief  This function is executed in case of error occurrence.
 * @retval None
 */
void Error_Handler(void) {
	/* USER CODE BEGIN Error_Handler_Debug */
	/* User can add his own implementation to report the HAL error return state */

	/* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
 * @brief  Reports the name of the source file and the source line number
 *         where the assert_param error has occurred.
 * @param  file: pointer to the source file name
 * @param  line: assert_param error line source number
 * @retval None
 */
void assert_failed(uint8_t *file, uint32_t line)
{
	/* USER CODE BEGIN 6 */
	/* User can add his own implementation to report the file name and line number,
	 tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
	/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/