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ak-kr-project/Core/Src/main.c

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/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2025 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define DISPLAY_RS ((uint16_t) (0x1U << 7))
#define DISPLAY_RW ((uint16_t) (0x1U << 10))
#define DISPLAY_ENA ((uint16_t) (0x1U << 11))
#define UPDATE_STATUS GPIOD->ODR = ((GPIOE->ODR & DISPLAY_ENA) << 1) | ((GPIOE->ODR & DISPLAY_RS) << 6)
#define DISPLAY_CHAR_DELAY 1 // character
#define DISPLAY_COMM_DELAY 60 // command
#define DISPLAY_INSTRUCT_BYTE(byte) \
do { \
GPIOE->ODR = ((((uint16_t)(byte)) << 8) & 0xF000); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
GPIOE->BSRR = DISPLAY_ENA; \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
GPIOE->BSRR = (DISPLAY_ENA << 16); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
\
GPIOE->ODR = ((((uint16_t)(byte)) << 12) & 0xF000); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
GPIOE->BSRR = DISPLAY_ENA; \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
GPIOE->BSRR = (DISPLAY_ENA << 16); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_COMM_DELAY); \
} while (0)
#define DISPLAY_DATA_BYTE(byte) \
do { \
GPIOE->ODR = (((((uint16_t)(byte)) << 8) & 0xF000) | DISPLAY_RS); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
GPIOE->BSRR = DISPLAY_ENA; \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
GPIOE->BSRR = (DISPLAY_ENA << 16); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
\
GPIOE->ODR = (((((uint16_t)(byte)) << 12) & 0xF000) | DISPLAY_RS); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
GPIOE->BSRR = DISPLAY_ENA; \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
GPIOE->BSRR = (DISPLAY_ENA << 16); \
UPDATE_STATUS; \
HAL_Delay(DISPLAY_CHAR_DELAY); \
} while (0)
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 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();
/* USER CODE BEGIN 2 */
DISPLAY_INSTRUCT_BYTE(0x01);
GPIOD->ODR = 0xF000;
HAL_Delay(1000);
//HAL_GPIO_WritePin(GPIOD, GPIO_PIN_15, GPIO_PIN_SET);
uint8_t display_status = 0x0;
int attempts_left;
while (1) {
GPIOE->MODER &= 0x00FFFFFFU;
attempts_left = 10;
do {
if (GPIOE->MODER & 0xFF000000U) {
// port didn't switch mode
GPIOD->ODR = 0x4000U;
while (1) {}
} else {
GPIOD->ODR = 0x0U;
}
GPIOE->BSRR = DISPLAY_RW | (DISPLAY_RS << 16);
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(20);
display_status = (GPIOE->IDR & 0xF000) >> 8;
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(20);
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(20);
display_status |= (GPIOE->IDR & 0xF000) >> 12;
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(20);
GPIOD->ODR = ((display_status & 0xF0) << 8);
HAL_Delay(50);
} while (((display_status & 0x80) || ((display_status & 0x7F) != 0)) && attempts_left--);
if (!((display_status & 0x80) || ((display_status & 0x7F) != 0)))
break;
GPIOD->ODR = 0x0U;
GPIOE->ODR = 0x0U;
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(20);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(20);
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(20);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(20);
GPIOE->MODER |= 0x55000000U;
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(20);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(20);
DISPLAY_INSTRUCT_BYTE(0x01);
HAL_Delay(500);
}
GPIOD->ODR = 0x0U;
GPIOE->ODR = 0x0U;
/*
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(1);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(1);
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(1);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(1);
*/
GPIOE->MODER |= 0x55000000U;
// init display
/*
GPIOE->BSRR = DISPLAY_ENA;
HAL_Delay(1);
GPIOE->BSRR = (DISPLAY_ENA << 16);
HAL_Delay(1);
*/
// reset (supposedly)
DISPLAY_INSTRUCT_BYTE(0x01);
// switch to 4-bit 2-line mode
DISPLAY_INSTRUCT_BYTE(0x28);
// write characters
char a[] = "Well, hi there!";
for (int i = 0; i < sizeof(a)-1; i++) {
DISPLAY_DATA_BYTE(a[i]);
}
// next line
DISPLAY_INSTRUCT_BYTE(0xC0);
// write more characters
char b[] = "I'm doing it!";
for (int i = 0; i < sizeof(b)-1; i++) {
DISPLAY_DATA_BYTE(b[i]);
}
GPIOE->ODR = 0x0U;
UPDATE_STATUS;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* 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};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** 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 GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOE_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOE, GPIO_PIN_7|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12
|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15, GPIO_PIN_RESET);
/*Configure GPIO pins : PE7 PE10 PE11 PE12
PE13 PE14 PE15 */
GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12
|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
/*Configure GPIO pins : PD12 PD13 PD14 PD15 */
GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* 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 */
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