Hello, I'm relatively new to the stm32cubeIDE and currently using it to program a self balancing robot using an stm32F103C8T6 chip.
My current issue is that when i run the SSD1306 OLED display through SPI I am able to display graphics and text as required but as soon as i add the I2C protocol on to the chip the SSD1306 chooses not to display anything. I haven't coded the I2C to read from the MPU6050 sensor as of yet as I am trying to get around this problem as it seems more a I2C bus problem than a specific device problem.
I'm using the SSD1306 library provided by afikson on github (afiskon/stm32-ssd1306: STM32 library for working with OLEDs based on SSD1306, SH1106, SH1107 and SSD1309, supports I2C and SPI)
Not yet got a library or code for the MPU6050.
I should also mention that the SSD1306 CS pin is connected to ground on the module itself (not to the bluepill as seen in the wiring diagram, put it in there for reference) as it is the only device on the SPI bus. On top of that my upload method to the Bluepill is using a USB to TTL connector (pins A9 and A10 are connected to the connector as well as the 3.3V pin and the GND pin the CS pin is using in the diagram). The code i wish to upload is then built and converted to a .hex file from the stm32CubeIDE in order to be uploaded through the stm32CubeProgrammer.
I will attach my main code below as well as the ssd1306_config header file as that is the only code that was edited so the SSD1306 display can work:
main.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* 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_tests.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;
SPI_HandleTypeDef hspi1;
/* USER CODE BEGIN PV */
/* 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_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 */
/* 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();
MX_I2C1_Init();
/* USER CODE BEGIN 2 */
ssd1306_Init();
ssd1306_TestDrawBitmap();
/* 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};
/** 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 = 0;
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 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(GPIOC, LED_Pin|OLED_CS_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(OLED_DC_GPIO_Port, OLED_DC_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(OLED_Res_GPIO_Port, OLED_Res_Pin, GPIO_PIN_RESET);
/*Configure GPIO pins : LED_Pin OLED_CS_Pin */
GPIO_InitStruct.Pin = LED_Pin|OLED_CS_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/*Configure GPIO pin : OLED_DC_Pin */
GPIO_InitStruct.Pin = OLED_DC_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(OLED_DC_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : OLED_Res_Pin */
GPIO_InitStruct.Pin = OLED_Res_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(OLED_Res_GPIO_Port, &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 */
ssd1306_conf.h
/**
* Private configuration file for the SSD1306 library.
* This example is configured for STM32F0, I2C and including all fonts.
*/
#ifndef __SSD1306_CONF_H__
#define __SSD1306_CONF_H__
#include "main.h"
// Choose a microcontroller family
//#define STM32F0
#define STM32F1
//#define STM32F4
//#define STM32L0
//#define STM32L1
//#define STM32L4
//#define STM32F3
//#define STM32H7
//#define STM32F7
//#define STM32G0
// Choose a bus
//#define SSD1306_USE_I2C
#define SSD1306_USE_SPI
// I2C Configuration
//#define SSD1306_I2C_PORT hi2c1
//#define SSD1306_I2C_ADDR (0x3C << 1)
// SPI Configuration
#define SSD1306_SPI_PORT hspi1
#define SSD1306_CS_Port OLED_CS_GPIO_Port
#define SSD1306_CS_Pin OLED_CS_Pin
#define SSD1306_DC_Port OLED_DC_GPIO_Port
#define SSD1306_DC_Pin OLED_DC_Pin
#define SSD1306_Reset_Port OLED_Res_GPIO_Port
#define SSD1306_Reset_Pin OLED_Res_Pin
// Mirror the screen if needed
// #define SSD1306_MIRROR_VERT
// #define SSD1306_MIRROR_HORIZ
// Set inverse color if needed
// # define SSD1306_INVERSE_COLOR
// Include only needed fonts
#define SSD1306_INCLUDE_FONT_6x8
#define SSD1306_INCLUDE_FONT_7x10
#define SSD1306_INCLUDE_FONT_11x18
#define SSD1306_INCLUDE_FONT_16x26
#define SSD1306_INCLUDE_FONT_16x24
#define SSD1306_INCLUDE_FONT_16x15
// The width of the screen can be set using this
// define. The default value is 128.
#define SSD1306_WIDTH 128
// If your screen horizontal axis does not start
// in column 0 you can use this define to
// adjust the horizontal offset
// #define SSD1306_X_OFFSET
// The height can be changed as well if necessary.
// It can be 32, 64 or 128. The default value is 64.
#define SSD1306_HEIGHT 64
#endif /* __SSD1306_CONF_H__ */
I hope I have provided enough information to get a guide as to what may be wrong.
Thank you,
Rowan
1 ACCEPTED SOLUTION
Accepted Solutions
