#include "main.h"
#include "gw_grayscale_sensor.h"

#define GW_GRAY_ADDR GW_GRAY_ADDR_DEF
#define GW_GRAY_SERIAL_GPIO_GROUP GPIOB
#define GW_GRAY_SERIAL_GPIO_CLK GPIO_PIN_8 //PB8 串行CLK
#define GW_GRAY_SERIAL_GPIO_DAT GPIO_PIN_9 //PB9 串行DAT
#define GW_GRAY_SERIAL_DELAY_VALUE 27

void SystemClock_Config(void);
static void MX_GPIO_Init(void);

/* 8MHz 5us大概是27, 64MHz 5us大概是270 */
static void delay(uint32_t delay_count)
{
	for (int i = 0; i < delay_count; ++i) {
		__NOP();
	}
}

static uint8_t gw_gray_serial_read()
{
	uint8_t ret = 0;

	for (int i = 0; i < 8; ++i) {
		/* 输出时钟下降沿 */
		HAL_GPIO_WritePin(GW_GRAY_SERIAL_GPIO_GROUP, GW_GRAY_SERIAL_GPIO_CLK, 0);
		delay(GW_GRAY_SERIAL_DELAY_VALUE); // 外部有上拉源(大约10k电阻) 可不加此行

		ret |= HAL_GPIO_ReadPin(GW_GRAY_SERIAL_GPIO_GROUP, GW_GRAY_SERIAL_GPIO_DAT) << i;

		/* 输出时钟上升沿,让传感器更新数据*/
		HAL_GPIO_WritePin(GW_GRAY_SERIAL_GPIO_GROUP, GW_GRAY_SERIAL_GPIO_CLK, 1);

		/* 主控频率高的需要给一点点延迟,延迟需要在5us左右 */
		delay(GW_GRAY_SERIAL_DELAY_VALUE);
	}

	return ret;
}

int main(void)
{
	HAL_Init();
	SystemClock_Config();
	MX_GPIO_Init();

	// 此处"volatile"仅用于观察数据（volatile会阻止编译器对目标的优化），移植的时候请去掉"volatile"修饰词
	volatile uint8_t sensor_data;
	volatile uint8_t sensor[8];

	while (1) {
		sensor_data = gw_gray_serial_read();
		// sensor_data 有8个探头的数据 最低位是第一个探头数据

		// 把八个探头的数据分散到八个变量里
		SEP_ALL_BIT8(sensor_data,
			sensor[0], sensor[1], sensor[2], sensor[3], sensor[4], sensor[5], sensor[6], sensor[7]);
		HAL_Delay(1);
	}
}


void SystemClock_Config(void)
{
	RCC_OscInitTypeDef RCC_OscInitStruct = {0};
	RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

	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();
	}

	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_DIV2;
	RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

	if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
	{
		Error_Handler();
	}
}

static void MX_GPIO_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStruct = {0};
	__HAL_RCC_GPIOB_CLK_ENABLE();

	HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);

	GPIO_InitStruct.Pin = GPIO_PIN_8;
	GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
	HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

	GPIO_InitStruct.Pin = GPIO_PIN_9;
	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
	GPIO_InitStruct.Pull = GPIO_PULLUP;
	HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}

void Error_Handler(void)
{
	__disable_irq();
	while (1)
	{
	}
}

#ifdef  USE_FULL_ASSERT

void assert_failed(uint8_t *file, uint32_t line)
{

}
#endif /* USE_FULL_ASSERT */