File content as of revision 0:18b766aea0ef:

//i2c_HT16K33_test1_767_1

#include "mbed.h"

#include "main.h"

#include "SSD1308.h"


#define ADDR        (0x70<<1)  //  address

DigitalOut myled(PB_0);

I2C_HandleTypeDef hi2c1;

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};

    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

    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;
    HAL_RCC_OscConfig(&RCC_OscInitStruct);

    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;
    HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);

    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2C1;
    PeriphClkInitStruct.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
    HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
}

static void MX_I2C1_Init(void)
{
    hi2c1.Instance = I2C1;
    hi2c1.Init.Timing = 0x00303D5B;
    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;
    HAL_I2C_Init(&hi2c1);

    HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE);
    HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0);
}

static void MX_GPIO_Init(void)
{
    __HAL_RCC_GPIOB_CLK_ENABLE();
}

void HAL_MspInit(void)
{
    __HAL_RCC_PWR_CLK_ENABLE();
    __HAL_RCC_SYSCFG_CLK_ENABLE();
}

void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    if(hi2c->Instance==I2C1) {
        __HAL_RCC_GPIOB_CLK_ENABLE();
        /**I2C1 GPIO Configuration
        PB8     ------> I2C1_SCL
        PB9     ------> I2C1_SDA
        */
        GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

        __HAL_RCC_I2C1_CLK_ENABLE();
    }
}



int main()
{

    HAL_Init();

    SystemClock_Config();
    MX_GPIO_Init();
    MX_I2C1_Init();

    HAL_MspInit();

    HAL_I2C_MspInit(&hi2c1);


SSD1308 oled = SSD1308( &hi2c1 , SSD1308_SA0);
//SSD1308 oled = SSD1308( &hi2c1 , ADDR);



    //char n1_8[] = "12345678";
    char n1_8[] = "87654321";
    //char n1_8[] =   "88888888";

    int ii=0;
    for(int nn=0; nn<8; nn++) {
        //                y   x
        oled.writeBigChar(0, ii*16,n1_8[nn]);
        ii = ii + 1;
    } //for
    //pc.printf("Printed something\r\n");
//    printf("Printed something\r\n");
    
    //oled.writeString(0, 0, "Hello World !");  




}//main