【STM32U5A5ZJ development board】 SPI bus interface and SSD1306 OLED test
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The SPI bus test of the STM32U5A5ZJ development board uses the OLED SSD1306 chip with SPI interface for testing. The SSD1306 chip only uses the output function of SPI, so it cannot reflect the comprehensive characteristics of the SPI bus. Originally, I wanted to use DMA to operate the SPI interface this time, but after several attempts, STM32CUBE could not generate the DMA initialization code, so I could only use the normal mode to test the SPI bus.
SSD1306 is a SPI/I2C dual-interface chip, and the interface mode can be configured through pins, but the finished OLED screen has a fixed interface setting.
The main interfaces of SPI settings are D0, D1, DC, VCC, GND, CS, RES.
D0 ---------------- SPI CLK
D1 ---------------- SPI MOSI
DC ---------------- Data/Command Selection
VCC --------------- 3.3V power supply
GND---------------- Power ground
CS ----------------- Chip enable
RES --------------- Reset signal
Among them, CS is the selection signal and the others are required signals.
1. First set the necessary system clock
Set the system clock to 160MHZ. The SPI bus uses the standard system bus clock, so no additional settings are required.
2. SPI settings and SSD1306 control pin settings
The physical connection is: SPI1 interface, D0 CLK PA5, D1 MOSI PA7, DC PF12, RES PD15
In the SPI settings, you need to change the data length to 8 bits, and leave the others as default. Generate the code after the settings are completed.
3. SSD Driver
The main program logic is:
ssd1306_SetCursor(0, 0);
ssd1306_WriteString(timerStr, Font_11x18, White);
ssd1306_UpdateScreen();
The above three functions set the cursor, output graphics, and update settings.
/* USER CODE BEGIN Header */
/**
******************************************************************************
* [url=home.php?mod=space&uid=1307177]@File[/url] : main.c
* [url=home.php?mod=space&uid=159083]@brief[/url] : Main program body
******************************************************************************
* [url=home.php?mod=space&uid=1020061]@attention[/url] *
* Copyright (c) 2024 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 */
#include "ssd1306.h"
#include "ssd1306_fonts.h"
/* 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 ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
UART_HandleTypeDef hlpuart1;
UART_HandleTypeDef huart1;
DMA_HandleTypeDef handle_LPDMA1_Channel0;
TIM_HandleTypeDef htim2;
TIM_HandleTypeDef htim8;
DMA_NodeTypeDef Node_GPDMA1_Channel0;
DMA_QListTypeDef List_GPDMA1_Channel0;
DMA_HandleTypeDef handle_GPDMA1_Channel0;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void SystemPower_Config(void);
static void MX_GPIO_Init(void);
static void MX_GPDMA1_Init(void);
static void MX_LPDMA1_Init(void);
static void MX_ICACHE_Init(void);
static void MX_LPUART1_UART_Init(void);
static void MX_TIM8_Init(void);
static void MX_TIM2_Init(void);
static void MX_USART1_UART_Init(void);
static void MX_I2C1_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 */
char timerStr[] = {"STM32U5 "};
/* 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();
/* Configure the System Power */
SystemPower_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_GPDMA1_Init();
MX_LPDMA1_Init();
MX_ICACHE_Init();
MX_LPUART1_UART_Init();
MX_TIM8_Init();
MX_TIM2_Init();
MX_USART1_UART_Init();
MX_I2C1_Init();
/* USER CODE BEGIN 2 */
ssd1306_Init();
ssd1306_Fill(Black);
ssd1306_UpdateScreen();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
ssd1306_SetCursor(0, 0);
ssd1306_WriteString(timerStr, Font_11x18, White);
ssd1306_UpdateScreen();
HAL_GPIO_TogglePin(LED1_GPIO_Port,LED1_Pin);
HAL_Delay(500);
/* 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
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMBOOST = RCC_PLLMBOOST_DIV1;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 10;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 1;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLLVCIRANGE_1;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
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_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief Power Configuration
* @retval None
*/
static void SystemPower_Config(void)
{
/*
* Disable the internal Pull-Up in Dead Battery pins of UCPD peripheral
*/
HAL_PWREx_DisableUCPDDeadBattery();
/*
* Switch to SMPS regulator instead of LDO
*/
if (HAL_PWREx_ConfigSupply(PWR_SMPS_SUPPLY) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN PWR */
/* USER CODE END PWR */
}
/**
* @brief GPDMA1 Initialization Function
* @param None
* @retval None
*/
static void MX_GPDMA1_Init(void)
{
/* USER CODE BEGIN GPDMA1_Init 0 */
/* USER CODE END GPDMA1_Init 0 */
/* Peripheral clock enable */
__HAL_RCC_GPDMA1_CLK_ENABLE();
/* GPDMA1 interrupt Init */
HAL_NVIC_SetPriority(GPDMA1_Channel0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(GPDMA1_Channel0_IRQn);
/* USER CODE BEGIN GPDMA1_Init 1 */
/* USER CODE END GPDMA1_Init 1 */
/* USER CODE BEGIN GPDMA1_Init 2 */
/* USER CODE END GPDMA1_Init 2 */
}
/**
* @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.Timing = 0x30909DEC;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
/** Configure Analogue filter
*/
if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
{
Error_Handler();
}
/** Configure Digital filter
*/
if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN I2C1_Init 2 */
/* USER CODE END I2C1_Init 2 */
}
/**
* @brief ICACHE Initialization Function
* @param None
* @retval None
*/
static void MX_ICACHE_Init(void)
{
/* USER CODE BEGIN ICACHE_Init 0 */
/* USER CODE END ICACHE_Init 0 */
/* USER CODE BEGIN ICACHE_Init 1 */
/* USER CODE END ICACHE_Init 1 */
/** Enable instruction cache in 1-way (direct mapped cache)
*/
if (HAL_ICACHE_ConfigAssociativityMode(ICACHE_1WAY) != HAL_OK)
{
Error_Handler();
}
if (HAL_ICACHE_Enable() != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ICACHE_Init 2 */
/* USER CODE END ICACHE_Init 2 */
}
/**
* @brief LPDMA1 Initialization Function
* @param None
* @retval None
*/
static void MX_LPDMA1_Init(void)
{
/* USER CODE BEGIN LPDMA1_Init 0 */
/* USER CODE END LPDMA1_Init 0 */
/* Peripheral clock enable */
__HAL_RCC_LPDMA1_CLK_ENABLE();
/* LPDMA1 interrupt Init */
HAL_NVIC_SetPriority(LPDMA1_Channel0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(LPDMA1_Channel0_IRQn);
/* USER CODE BEGIN LPDMA1_Init 1 */
/* USER CODE END LPDMA1_Init 1 */
/* USER CODE BEGIN LPDMA1_Init 2 */
/* USER CODE END LPDMA1_Init 2 */
}
/**
* @brief LPUART1 Initialization Function
* @param None
* @retval None
*/
static void MX_LPUART1_UART_Init(void)
{
/* USER CODE BEGIN LPUART1_Init 0 */
/* USER CODE END LPUART1_Init 0 */
/* USER CODE BEGIN LPUART1_Init 1 */
/* USER CODE END LPUART1_Init 1 */
hlpuart1.Instance = LPUART1;
hlpuart1.Init.BaudRate = 115200;
hlpuart1.Init.WordLength = UART_WORDLENGTH_8B;
hlpuart1.Init.StopBits = UART_STOPBITS_1;
hlpuart1.Init.Parity = UART_PARITY_NONE;
hlpuart1.Init.Mode = UART_MODE_TX_RX;
hlpuart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
hlpuart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
hlpuart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
hlpuart1.FifoMode = UART_FIFOMODE_DISABLE;
if (HAL_UART_Init(&hlpuart1) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&hlpuart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&hlpuart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&hlpuart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN LPUART1_Init 2 */
/* USER CODE END LPUART1_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;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* @brief TIM2 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM2_Init(void)
{
/* USER CODE BEGIN TIM2_Init 0 */
/* USER CODE END TIM2_Init 0 */
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
/* USER CODE BEGIN TIM2_Init 1 */
/* USER CODE END TIM2_Init 1 */
htim2.Instance = TIM2;
htim2.Init.Prescaler = 159;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 2000000;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 1000000;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM2_Init 2 */
/* USER CODE END TIM2_Init 2 */
HAL_TIM_MspPostInit(&htim2);
}
/**
* @brief TIM8 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM8_Init(void)
{
/* USER CODE BEGIN TIM8_Init 0 */
/* USER CODE END TIM8_Init 0 */
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};
/* USER CODE BEGIN TIM8_Init 1 */
/* USER CODE END TIM8_Init 1 */
htim8.Instance = TIM8;
htim8.Init.Prescaler = 159;
htim8.Init.CounterMode = TIM_COUNTERMODE_UP;
htim8.Init.Period = 1000;
htim8.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim8.Init.RepetitionCounter = 0;
htim8.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_PWM_Init(&htim8) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim8, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 500;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if (HAL_TIM_PWM_ConfigChannel(&htim8, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
sBreakDeadTimeConfig.DeadTime = 0;
sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
sBreakDeadTimeConfig.BreakFilter = 0;
sBreakDeadTimeConfig.BreakAFMode = TIM_BREAK_AFMODE_INPUT;
sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;
sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;
sBreakDeadTimeConfig.Break2Filter = 0;
sBreakDeadTimeConfig.Break2AFMode = TIM_BREAK_AFMODE_INPUT;
sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
if (HAL_TIMEx_ConfigBreakDeadTime(&htim8, &sBreakDeadTimeConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM8_Init 2 */
/* USER CODE END TIM8_Init 2 */
HAL_TIM_MspPostInit(&htim8);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
/* 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_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/* 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 */
The main program is relatively simple, mainly the driver.
#include "ssd1306.h"
#if defined(SSD1306_USE_I2C)
void ssd1306_Reset(void) {
/* for I2C - do nothing */
}
// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {
HAL_I2C_Mem_Write(&SSD1306_I2C_PORT, SSD1306_I2C_ADDR, 0x00, 1, &byte, 1, HAL_MAX_DELAY);
}
// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {
HAL_I2C_Mem_Write(&SSD1306_I2C_PORT, SSD1306_I2C_ADDR, 0x40, 1, buffer, buff_size, HAL_MAX_DELAY);
}
#elif defined(SSD1306_USE_SPI)
void ssd1306_Reset(void) {
// CS = High (not selected)
HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET);
// Reset the OLED
HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_RESET);
HAL_Delay(10);
HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_SET);
HAL_Delay(10);
}
// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {
HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // command
HAL_SPI_Transmit(&SSD1306_SPI_PORT, (uint8_t *) &byte, 1, HAL_MAX_DELAY);
HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}
// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {
HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // data
HAL_SPI_Transmit(&SSD1306_SPI_PORT, buffer, buff_size, HAL_MAX_DELAY);
HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}
#else
#error "You should define SSD1306_USE_SPI or SSD1306_USE_I2C macro"
#endif
// Screenbuffer
static uint8_t SSD1306_Buffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8];
// Screen object
static SSD1306_t SSD1306;
// Initialize the oled screen
void ssd1306_Init(void) {
// Reset OLED
ssd1306_Reset();
// Wait for the screen to boot
HAL_Delay(100);
// Init OLED
ssd1306_WriteCommand(0xAE); //display off
ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
ssd1306_WriteCommand(0x10); // 00,Horizontal Addressing Mode; 01,Vertical Addressing Mode;
// 10,Page Addressing Mode (RESET); 11,Invalid
ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
#ifdef SSD1306_MIRROR_VERT
ssd1306_WriteCommand(0xC0); // Mirror vertically
#else
ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endif
ssd1306_WriteCommand(0x00); //---set low column address
ssd1306_WriteCommand(0x10); //---set high column address
ssd1306_WriteCommand(0x40); //--set start line address - CHECK
ssd1306_WriteCommand(0x81); //--set contrast control register - CHECK
ssd1306_WriteCommand(0xFF);
#ifdef SSD1306_MIRROR_HORIZ
ssd1306_WriteCommand(0xA0); // Mirror horizontally
#else
ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif
#ifdef SSD1306_INVERSE_COLOR
ssd1306_WriteCommand(0xA7); //--set inverse color
#else
ssd1306_WriteCommand(0xA6); //--set normal color
#endif
ssd1306_WriteCommand(0xA8); //--set multiplex ratio(1 to 64) - CHECK
ssd1306_WriteCommand(0x3F); //
ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
ssd1306_WriteCommand(0xD3); //-set display offset - CHECK
ssd1306_WriteCommand(0x00); //-not offset
ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
ssd1306_WriteCommand(0xF0); //--set divide ratio
ssd1306_WriteCommand(0xD9); //--set pre-charge period
ssd1306_WriteCommand(0x22); //
ssd1306_WriteCommand(0xDA); //--set com pins hardware configuration - CHECK
ssd1306_WriteCommand(0x12);
ssd1306_WriteCommand(0xDB); //--set vcomh
ssd1306_WriteCommand(0x20); //0x20,0.77xVcc
ssd1306_WriteCommand(0x8D); //--set DC-DC enable
ssd1306_WriteCommand(0x14); //
ssd1306_WriteCommand(0xAF); //--turn on SSD1306 panel
// Clear screen
ssd1306_Fill(Black);
// Flush buffer to screen
ssd1306_UpdateScreen();
// Set default values for screen object
SSD1306.CurrentX = 0;
SSD1306.CurrentY = 0;
SSD1306.Initialized = 1;
}
// Fill the whole screen with the given color
void ssd1306_Fill(SSD1306_COLOR color) {
/* Set memory */
uint32_t i;
for(i = 0; i < sizeof(SSD1306_Buffer); i++) {
SSD1306_Buffer[i] = (color == Black) ? 0x00 : 0xFF;
}
}
// Write the screenbuffer with changed to the screen
void ssd1306_UpdateScreen(void) {
uint8_t i;
for(i = 0; i < 8; i++) {
ssd1306_WriteCommand(0xB0 + i);
ssd1306_WriteCommand(0x00);
ssd1306_WriteCommand(0x10);
ssd1306_WriteData(&SSD1306_Buffer[SSD1306_WIDTH*i],SSD1306_WIDTH);
}
}
// Draw one pixel in the screenbuffer
// X => X Coordinate
// Y => Y Coordinate
// color => Pixel color
void ssd1306_DrawPixel(uint8_t x, uint8_t y, SSD1306_COLOR color) {
if(x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT) {
// Don't write outside the buffer
return;
}
// Check if pixel should be inverted
if(SSD1306.Inverted) {
color = (SSD1306_COLOR)!color;
}
// Draw in the right color
if(color == White) {
SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] |= 1 << (y % 8);
} else {
SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));
}
}
// Draw 1 char to the screen buffer
// ch => char om weg te schrijven
// Font => Font waarmee we gaan schrijven
// color => Black or White
char ssd1306_WriteChar(char ch, FontDef Font, SSD1306_COLOR color) {
uint32_t i, b, j;
// Check remaining space on current line
if (SSD1306_WIDTH <= (SSD1306.CurrentX + Font.FontWidth) ||
SSD1306_HEIGHT <= (SSD1306.CurrentY + Font.FontHeight))
{
// Not enough space on current line
return 0;
}
// Use the font to write
for(i = 0; i < Font.FontHeight; i++) {
b = Font.data[(ch - 32) * Font.FontHeight + i];
for(j = 0; j < Font.FontWidth; j++) {
if((b << j) & 0x8000) {
ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR) color);
} else {
ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR)!color);
}
}
}
// The current space is now taken
SSD1306.CurrentX += Font.FontWidth;
// Return written char for validation
return ch;
}
// Write full string to screenbuffer
char ssd1306_WriteString(char* str, FontDef Font, SSD1306_COLOR color) {
// Write until null-byte
while (*str) {
if (ssd1306_WriteChar(*str, Font, color) != *str) {
// Char could not be written
return *str;
}
// Next char
str++;
}
// Everything ok
return *str;
}
// Position the cursor
void ssd1306_SetCursor(uint8_t x, uint8_t y) {
SSD1306.CurrentX = x;
SSD1306.CurrentY = y;
}
The driver is downloaded from github.
Testing process:
Running the program can display the content STM32U5, content
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变色卡
千斤顶
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