《2023DigiKey汽车应用创意挑战赛》---驱动OLED显示屏

suncat0504

作为显示部件，本来是打算使用I2C接口的OLED，和板载的传感器使用相同的接口。它们基本上都是用PH4作为SCL，PH5作为SDA，使用I2C接口协议。为此查看PH4和PH5是否对外开放了插头座之类的接口。可以看到在CN2中已经开放了，在第7脚和第10脚刚好就是对应PH4和PH5。

CN2和CN3都是2*10的2.0mm输出插座。为了方便连接OLED，买了转接板，将2.0mm转为2.54mm间距，方便用杜邦线连接。

为此简单修改下GPIO_TOGGLE程序，测试PH4和PH5的输出。

在原来的程序基础上，
1、在main.h中加入以下代码：
#define I2C_GPIO_PORT                GPIOH
#define I2C_GPIO_CLK_ENABLE()          __HAL_RCC_GPIOH_CLK_ENABLE()
#define I2C_SCK_GPIO_CLK_DISABLE()       __HAL_RCC_GPIOH_CLK_DISABLE()
#define I2C_SCL_PIN                      GPIO_PIN_4
#define I2C_SDA_PIN                      GPIO_PIN_5
2、在主程序main中加入以下代码：
// 允许使用PH4和PH5作为I2C的SCL和SDA。因为同样使用PH口，所以不再设置Mode，Pull，Speed
GPIO_InitStruct.Pin = I2C_SCL_PIN | I2C_SDA_PIN;
HAL_GPIO_Init(I2C_GPIO_PORT, &GPIO_InitStruct);
运行能看到PH4和PH5的正常输出。至此完成 GPIO口的的设置。下面是加入OLED驱动的相关代码。是以软件模拟方式操作的（虽然PH4和PH5是可以复用为I2C2的SCL和SDA，但是用I2C外设方式操作I2C从设备，实在是很麻烦）。由于OLED的电压是3.3V，而CN2和CN3并没有这个电压的输出，幸好这个我开发板的反面提供了Arduino的输出支持，其中有3.3V可用。
以下是main.c的代码，其它代码就不粘贴了，后面附上整个工程的压缩包。

/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file GPIO/GPIO_IOToggle/Src/main.c
* @author MCD Application Team
* @brief This example describes how to configure and use GPIOs through
* the STM32U5xx HAL API.
******************************************************************************
* @attention
*
* Copyright (c) 2021 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 "gui.h"
#include "bmp.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 ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
static GPIO_InitTypeDef GPIO_InitStruct;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void SystemPower_Config(void);
static void MX_ICACHE_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void TEST_Para(void) {
uint8_t i;
srand(123456789);
GUI_ShowString(0,0, (unsigned char *)"Para1:",8,1);
GUI_ShowString(64,0,(unsigned char *)"8888",8,1);
GUI_ShowString(0,8,(unsigned char *)"Para2:",8,1);
GUI_ShowString(64,8,(unsigned char *)"888",8,1);
GUI_ShowString(0,16,(unsigned char *)"Para3:",8,1);
GUI_ShowString(64,16,(unsigned char *)"888",8,1);
GUI_ShowString(0,24,(unsigned char *)"Para4:",8,1);
GUI_ShowString(64,24,(unsigned char *)"888",8,1);
for(i=0;i<15;i++) {
GUI_ShowNum(64,0,rand()%10+1,1,8,1);
GUI_ShowNum(72,0,rand()%10,1,8,1);
GUI_ShowNum(80,0,rand()%10,1,8,1);
GUI_ShowNum(88,0,rand()%10,1,8,1);
GUI_ShowNum(64,8,rand()%10+1,1,8,1);
GUI_ShowNum(72,8,rand()%10,1,8,1);
GUI_ShowNum(80,8,rand()%10,1,8,1);
GUI_ShowNum(64,16,rand()%10+1,1,8,1);
GUI_ShowNum(72,16,rand()%10,1,8,1);
GUI_ShowNum(80,16,rand()%10,1,8,1);
GUI_ShowNum(64,24,rand()%10+1,1,8,1);
GUI_ShowNum(72,24,rand()%10,1,8,1);
GUI_ShowNum(80,24,rand()%10,1,8,1);
HAL_Delay(500);
}
}
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void) {
/* USER CODE BEGIN 1 */
/* STM32U5xx HAL library initialization:
- Configure the Flash prefetch
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 3
- Low Level Initialization
*/
/* 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_ICACHE_Init();
/* USER CODE BEGIN 2 */
/* -1- Enable GPIO Clock (to be able to program the configuration registers) */
LED7_GPIO_CLK_ENABLE();
LED6_GPIO_CLK_ENABLE();
/* -2- Configure IO in output push-pull mode to drive external LEDs */
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Pin = LED7_PIN;
HAL_GPIO_Init(LED7_GPIO_PORT, &GPIO_InitStruct);
GPIO_InitStruct.Pin = LED6_PIN;
HAL_GPIO_Init(LED6_GPIO_PORT, &GPIO_InitStruct);
GPIO_InitStruct.Pin = I2C_SCL_PIN | I2C_SDA_PIN;
HAL_GPIO_Init(I2C_GPIO_PORT, &GPIO_InitStruct);
OLED_Init(); //初始化OLED
OLED_Clear(0); //清屏（全黑）
TEST_Menu();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1) {
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//HAL_GPIO_TogglePin(LED7_GPIO_PORT, LED7_PIN);
HAL_GPIO_WritePin(LED7_GPIO_PORT, LED7_PIN, GPIO_PIN_SET);
HAL_GPIO_WritePin(LED7_GPIO_PORT, LED6_PIN, GPIO_PIN_RESET);
HAL_Delay(500);
//HAL_GPIO_TogglePin(LED6_GPIO_PORT, LED6_PIN);
HAL_GPIO_WritePin(LED7_GPIO_PORT, LED6_PIN, GPIO_PIN_SET);
HAL_GPIO_WritePin(LED7_GPIO_PORT, LED7_PIN, GPIO_PIN_RESET);
/* Insert delay 100 ms */
HAL_Delay(500);
TEST_Para();
/* 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_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_4;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLMBOOST = RCC_PLLMBOOST_DIV1;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 80;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLLVCIRANGE_0;
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 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 */
}
/* USER CODE BEGIN 4 */
// 初始化GPIO口用于板载传感器的接口，PH4（SCK），PH5（SDA）
void Gpio_Init_I2c_ForSensor(void) {
}
/**
* 读取I2C设备的数据
*/
uint32_t Read_i2c_sensor(uint8_t devAddr, uint8_t cmd, uint8_t dat) {
}
/* 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 */
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) */
/* Infinite loop */
while (1)
{
}
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

复制代码

终于调试通了OLED的显示，接下来是对板载的一些传感器的数据读取。

工程包：

GPIO_IOToggle.zip (14.04 MB, 下载次数: 0)

注：工程使用CubeIDE开发

《2023DigiKey汽车应用创意挑战赛》---驱动OLED显示屏

suncat0504 LV7

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