/* 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"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stm32l0xx_hal.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 */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
SPI_HandleTypeDef hspi1;
/* USER CODE BEGIN PV */
volatile uint8_t spiTxComplete = 1;
uint8_t testData[] = {0xAA, 0x55};
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);
static void MX_NVIC_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void ILI9341_Init(void)
{
HAL_GPIO_WritePin(GPIOB, RST_Pin, GPIO_PIN_RESET);
HAL_Delay(50);
HAL_GPIO_WritePin(GPIOB, RST_Pin, GPIO_PIN_SET);
HAL_Delay(120);
ILI9341_SendCommand(0x01); // Software Reset
HAL_Delay(100);
ILI9341_SendCommand(0x28); // Display OFF
ILI9341_SendCommand(0x3A); // Pixel Format Set
ILI9341_SendData(0x55); // 16-bit/pixel
ILI9341_SendCommand(0x29); // Display ON
}
void ILI9341_SendCommand(uint8_t cmd)
{
HAL_GPIO_WritePin(GPIOB, DC_Pin, GPIO_PIN_RESET); // Command mode
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, &cmd, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_SET);
}
void ILI9341_SendData(uint8_t data)
{
HAL_GPIO_WritePin(GPIOB, DC_Pin, GPIO_PIN_SET); // Data mode
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, &data, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_SET);
}
void ILI9341_FillColor(uint16_t color)
{
uint8_t data[2] = {color >> 8, color & 0xFF};
// Set full-screen window
ILI9341_SendCommand(0x2A); // Column Address Set
ILI9341_SendData(0x00);
ILI9341_SendData(0x00);
ILI9341_SendData(0x00);
ILI9341_SendData(0xEF); // 239 (width - 1)
ILI9341_SendCommand(0x2B); // Page Address Set
ILI9341_SendData(0x00);
ILI9341_SendData(0x00);
ILI9341_SendData(0x01);
ILI9341_SendData(0x3F); // 319 (height - 1)
ILI9341_SendCommand(0x2C); // Memory Write
HAL_GPIO_WritePin(GPIOB, DC_Pin, GPIO_PIN_SET); // Data mode
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_RESET);
// Send same color for every pixel
for (int i = 0; i < 240 * 320; i++)
{
HAL_SPI_Transmit(&hspi1, data, 2, HAL_MAX_DELAY);
}
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_SET);
}
/* 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_SPI1_Init();
/* Initialize interrupts */
MX_NVIC_Init();
/* USER CODE BEGIN 2 */
ILI9341_Init();
HAL_Delay(500);
ILI9341_FillColor(0xF800); // Red
HAL_Delay(1000);
ILI9341_FillColor(0x07E0); // Green
HAL_Delay(1000);
ILI9341_FillColor(0x001F); // Blue
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/*
// 1️⃣ Select the SPI slave (Active Low)
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_RESET);
// 2️⃣ Transmit data in blocking (polling) mode
HAL_StatusTypeDef status = HAL_SPI_Transmit(&hspi1, testData, sizeof(testData), HAL_MAX_DELAY);
// 3️⃣ Deselect the SPI slave
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_SET);
// 4️⃣ Indicate transfer result
if (status == HAL_OK)
{
// Transmission successful
HAL_GPIO_TogglePin(GPIOC, Debug_LED_Pin);
}
else
{
// Transmission failed
HAL_GPIO_WritePin(GPIOC, Debug_LED_Pin, GPIO_PIN_SET);
}
// 5️⃣ Delay a bit to make it visible
HAL_Delay(500);
*/
/* 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};
__HAL_FLASH_SET_LATENCY(FLASH_LATENCY_1);
/** 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.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief NVIC Configuration.
* @retval None
*/
static void MX_NVIC_Init(void)
{
/* SPI1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(SPI1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(SPI1_IRQn);
}
/**
* @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_4;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN SPI1_Init 2 */
/* USER CODE END SPI1_Init 2 */
}
/**
* @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_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(Debug_LED_GPIO_Port, Debug_LED_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOB, CS_Pin|RST_Pin, GPIO_PIN_SET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(DC_GPIO_Port, DC_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : Debug_LED_Pin */
GPIO_InitStruct.Pin = Debug_LED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(Debug_LED_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pins : CS_Pin DC_Pin RST_Pin */
GPIO_InitStruct.Pin = CS_Pin|DC_Pin|RST_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi)
{
HAL_GPIO_WritePin(GPIOC, Debug_LED_Pin, GPIO_PIN_RESET);
if (hspi->Instance == SPI1)
{
HAL_GPIO_WritePin(GPIOB, CS_Pin, GPIO_PIN_SET); // Deselect display
spiTxComplete = 1; // Transmission done
// HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);
}
}
void SPI1_IRQHandler(void) // <-- The essential missing piece
{
HAL_SPI_IRQHandler(&hspi1);
}
/* 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 */