keyboard/Core/Src/main.c

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
 * All rights reserved.</center></h2>
 *
 * This software component is licensed by ST under BSD 3-Clause license,
 * the "License"; You may not use this file except in compliance with the
 * License. You may obtain a copy of the License at:
 *                        opensource.org/licenses/BSD-3-Clause
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <errno.h>
#include <stdint.h>
#include <sys/stat.h>
#include <stdio.h>
#include "scancode.h"
#include "keyboard.h"
#include "fifo.h"
#include <stdint.h>
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define CLK 4
#define DATA 5
#define RDY 6
#define WAIT 7

#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;

SPI_HandleTypeDef hspi1;

UART_HandleTypeDef huart1;

/* USER CODE BEGIN PV */
volatile struct FIFO buffer;
uint8_t i2c_data;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
// Clock the value to 74164
void write_value(uint8_t value) {
	HAL_SPI_Transmit(&hspi1, &value, 1, HAL_MAX_DELAY);

	// Indicate that a byte is waiting
	RDY_GPIO_Port->BSRR = (uint32_t)RDY_Pin << 16u;
	RDY_GPIO_Port->BSRR = RDY_Pin;
}

void add_to_queue(uint8_t c) {
	FIFO_push(&buffer, c);
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) {
	if (GPIO_Pin == KEYBOARD_CLK_Pin) {
		keyboard_interrupt(add_to_queue);
	}
}

// @todo How to install I2C Receive interrupt
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c) {
	if (hi2c->Instance == I2C1) {
		if (i2c_data == 0xFF) {
			// Reset to bootloader
			// @todo Make sure we set the conditions to actually go to the bootloader
			// Not that important for now as we are not going to use the bootloader for now
			HAL_NVIC_SystemReset();
			while (1);
		}

		FIFO_push(&buffer, i2c_data);

		HAL_I2C_Slave_Receive_IT(&hi2c1, &i2c_data, 1);
	}
}

int _isatty(int fd) {
	if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
		return 1;
	}

	errno = EBADF;
	return 0;
}

int _write(int fd, char* ptr, int len) {
	HAL_StatusTypeDef hstatus;

	if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
		hstatus = HAL_UART_Transmit(&huart1, (uint8_t*)ptr, len, HAL_MAX_DELAY);
		if (hstatus == HAL_OK) {
			return len;
		} else {
			return EIO;
		}
	}
	errno = EBADF;
	return -1;
}

int _close(int fd) {
	if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
		return 0;
	}

	errno = EBADF;
	return -1;
}

int _lseek(int fd, int ptr, int dir) {
	(void) fd;
	(void) ptr;
	(void) dir;

	errno = EBADF;
	return -1;
}

int _read(int fd, char* ptr, int len) {
	HAL_StatusTypeDef hstatus;

	if (fd == STDIN_FILENO) {
		hstatus = HAL_UART_Receive(&huart1, (uint8_t*)ptr, 1, HAL_MAX_DELAY);
		if (hstatus == HAL_OK) {
			return 1;
		} else {
			return EIO;
		}
	}
	errno = EBADF;
	return -1;
}

int _fstat(int fd, struct stat* st) {
	if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
		st->st_mode = S_IFCHR;
		return 0;
	}

	errno = EBADF;
	return 0;
}

/* 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_I2C1_Init();
	MX_USART1_UART_Init();
	MX_SPI1_Init();
	/* USER CODE BEGIN 2 */
	setvbuf(stdout, NULL, _IONBF, 0);

	printf("Starting keyboard\n\r");

	FIFO_clear(&buffer);
	// Reset keyboard
	send_keyboard_cmd(0xFF);

	// Wait for response from keyboard
	while(!FIFO_size(&buffer));
	while(FIFO_size(&buffer)) {
		printf("0x%X\n\r", FIFO_pop(&buffer));
	};

	// Set the keyboard repeat rate (and delay)
	send_keyboard_cmd(0xF3);
	send_keyboard_cmd(0x00 | (0<<5) | (0<<4));

	// Start receiving I2C
	HAL_I2C_Slave_Receive_IT(&hi2c1, &i2c_data, 1);

	/* USER CODE END 2 */

	/* Infinite loop */
	/* USER CODE BEGIN WHILE */
	while (1)
	{
		send_keyboard_cmd_queue();
		/*  */
		if (FIFO_size(&buffer) && HAL_GPIO_ReadPin(WAIT_GPIO_Port, WAIT_Pin) == GPIO_PIN_RESET) {
			write_value(FIFO_pop(&buffer));
		}
		/* USER CODE END WHILE */

		/* 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};

	/** Initializes the RCC Oscillators according to the specified parameters
	 * in the RCC_OscInitTypeDef structure.
	 */
	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 buses 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();
	}
}

/**
 * @brief I2C1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_I2C1_Init(void)
{

	/* USER CODE BEGIN I2C1_Init 0 */

	/* USER CODE END I2C1_Init 0 */

	/* USER CODE BEGIN I2C1_Init 1 */

	/* USER CODE END I2C1_Init 1 */
	hi2c1.Instance = I2C1;
	hi2c1.Init.ClockSpeed = 100000;
	hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
	hi2c1.Init.OwnAddress1 = 82;
	hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
	hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
	hi2c1.Init.OwnAddress2 = 0;
	hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
	hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
	if (HAL_I2C_Init(&hi2c1) != HAL_OK)
	{
		Error_Handler();
	}
	/* USER CODE BEGIN I2C1_Init 2 */

	/* USER CODE END I2C1_Init 2 */

}

/**
 * @brief SPI1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_SPI1_Init(void)
{

	/* USER CODE BEGIN SPI1_Init 0 */

	/* USER CODE END SPI1_Init 0 */

	/* USER CODE BEGIN SPI1_Init 1 */

	/* USER CODE END SPI1_Init 1 */
	/* SPI1 parameter configuration*/
	hspi1.Instance = SPI1;
	hspi1.Init.Mode = SPI_MODE_MASTER;
	hspi1.Init.Direction = SPI_DIRECTION_2LINES;
	hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
	hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
	hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
	hspi1.Init.NSS = SPI_NSS_SOFT;
	hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
	hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
	hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
	hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
	hspi1.Init.CRCPolynomial = 10;
	if (HAL_SPI_Init(&hspi1) != HAL_OK)
	{
		Error_Handler();
	}
	/* USER CODE BEGIN SPI1_Init 2 */

	/* USER CODE END SPI1_Init 2 */

}

/**
 * @brief USART1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_USART1_UART_Init(void)
{

	/* USER CODE BEGIN USART1_Init 0 */

	/* USER CODE END USART1_Init 0 */

	/* USER CODE BEGIN USART1_Init 1 */

	/* USER CODE END USART1_Init 1 */
	huart1.Instance = USART1;
	huart1.Init.BaudRate = 115200;
	huart1.Init.WordLength = UART_WORDLENGTH_8B;
	huart1.Init.StopBits = UART_STOPBITS_1;
	huart1.Init.Parity = UART_PARITY_NONE;
	huart1.Init.Mode = UART_MODE_TX_RX;
	huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
	huart1.Init.OverSampling = UART_OVERSAMPLING_16;
	if (HAL_UART_Init(&huart1) != HAL_OK)
	{
		Error_Handler();
	}
	/* USER CODE BEGIN USART1_Init 2 */

	/* USER CODE END USART1_Init 2 */

}

/**
 * @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_GPIOC_CLK_ENABLE();
	__HAL_RCC_GPIOD_CLK_ENABLE();
	__HAL_RCC_GPIOA_CLK_ENABLE();
	__HAL_RCC_GPIOB_CLK_ENABLE();

	/*Configure GPIO pin Output Level */
	HAL_GPIO_WritePin(RDY_GPIO_Port, RDY_Pin, GPIO_PIN_SET);

	/*Configure GPIO pin : WAIT_Pin */
	GPIO_InitStruct.Pin = WAIT_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(WAIT_GPIO_Port, &GPIO_InitStruct);

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

	/*Configure GPIO pin : KEYBOARD_CLK_Pin */
	GPIO_InitStruct.Pin = KEYBOARD_CLK_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(KEYBOARD_CLK_GPIO_Port, &GPIO_InitStruct);

	/*Configure GPIO pin : KEYBOARD_DATA_Pin */
	GPIO_InitStruct.Pin = KEYBOARD_DATA_Pin;
	GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
	GPIO_InitStruct.Pull = GPIO_NOPULL;
	HAL_GPIO_Init(KEYBOARD_DATA_GPIO_Port, &GPIO_InitStruct);

	/* EXTI interrupt init*/
	HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);
	HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);

}

/* 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 */
	__disable_irq();
	while (1)
	{
	}
	/* 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,
ex: 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****/