STM8L的LCD调试时不亮

1万 · 2021-1-5 09:31

STM8L052驱动LCD字段屏，烧录成功程序后上电复位LCD屏能显示，但是在DEBUG时LCD屏不亮。用万用表测量，DEBUG模式SEG和COM口之间没有压差，上电复位正常显示时压差在1V左右。

DEBUG模式没有打断点，直接全速运行。
求各位大佬指教！！！！！

附程序如下：
void main(void)
{

      GPIO_Init(GPIOD,GPIO_Pin_5,GPIO_Mode_Out_PP_Low_Fast);
      GPIO_SetBits(GPIOD,GPIO_Pin_5);

  /* Configures the LCD GLASS relative GPIO port IOs and LCD peripheral */
      LCD_GLASS_Init();

  /* Enable RTC clock */
      CLK_PeripheralClockConfig(CLK_Peripheral_RTC, ENABLE);
#if 1
  /* Configures the RTC */
      RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits);
      RTC_ITConfig(RTC_IT_WUT, ENABLE);

  /* Enable general Interrupt*/
      enableInterrupts();
#endif
      LCD->RAM[LCD_RAMRegister_0] =  0x00;
      LCD->RAM[LCD_RAMRegister_0] =  0xff;
      LCD->RAM[LCD_RAMRegister_1] =  0x00;
      LCD->RAM[LCD_RAMRegister_1] =  0xff;
      LCD->RAM[LCD_RAMRegister_2] =  0x00;
      LCD->RAM[LCD_RAMRegister_2] =  0xff;
      LCD->RAM[LCD_RAMRegister_3] =  0x00;
      LCD->RAM[LCD_RAMRegister_3] =  0xff;
      LCD->RAM[LCD_RAMRegister_4] =  0x00;
      LCD->RAM[LCD_RAMRegister_4] =  0xff;
      LCD->RAM[LCD_RAMRegister_5] =  0x00;
      LCD->RAM[LCD_RAMRegister_5] =  0xff;

  while (1)
  {
      LCD->RAM[LCD_RAMRegister_0] =  0x00;
      LCD->RAM[LCD_RAMRegister_0] =  0xff;
  }
}

/**
  * @brief  Configures the LCD GLASS relative GPIO port IOs and LCD peripheral.
  * @param  None
  * @retval None
  */
void LCD_GLASS_Init(void)
{

  /*
The LCD is configured as follow:
   - clock source = LSE (32.768 KHz)
   - Voltage source = Internal
   - Prescaler = 2
   - Divider = 18 (16 + 2)
   - Mode = 1/4 Duty, 1/3 Bias
   - LCD frequency = (clock source * Duty) / (Prescaler * Divider)
                  = 228 Hz ==> Frame frequency = 57 Hz */

//       CLK_PeripheralClockConfig(CLK_Peripheral_RTC, ENABLE);
      /* Enable LCD clock */
      CLK_PeripheralClockConfig(CLK_Peripheral_LCD, ENABLE);
      CLK_RTCClockConfig(CLK_RTCCLKSource_LSE, CLK_RTCCLKDiv_1);

      LCD_DeInit();
      /* Initialize the LCD */
      LCD_Init(LCD_Prescaler_2, LCD_Divider_18, LCD_Duty_1_4,
                     LCD_Bias_1_2, LCD_VoltageSource_External);//LCD_VoltageSource_InternalLCD_VoltageSource_External

      /* Mask register*/
      LCD_PortMaskConfig(LCD_PortMaskRegister_0, 0xFF);
      LCD_PortMaskConfig(LCD_PortMaskRegister_1, 0x00);
      LCD_PortMaskConfig(LCD_PortMaskRegister_2, 0x00);
      LCD_PortMaskConfig(LCD_PortMaskRegister_3, 0x00);

      LCD_ContrastConfig(LCD_Contrast_Level_7);
      LCD_DeadTimeConfig(LCD_DeadTime_0);
      LCD_PulseOnDurationConfig(LCD_PulseOnDuration_1);
//       Delay_Ms(80);
      LCD_Cmd(ENABLE); /*!< Enable LCD peripheral */
}

只看该作者 · 2021-1-7 10:10

我目前用stm8L152K4T6也在调试LCD,用示波器看端口电压应该在1.8v~2.45v这样，端口电压有点低了吧，

只看该作者 · 2021-1-7 10:57

本帖最后由做题小帮手于 2021-1-7 15:36 编辑

1）大家好，我用的是STM8L152K4T6单片机，液晶屏厂家给的资料是1/4 DUTT,1/3 BIAS，不论怎样修改分频系数，显示总是很暗，闪烁。将1/4改成1/8就显示正常了。
2）现在遇到的问题是，我向LCD_WriteRAM(LCD_RAMRegister_1,0x01); LCD_WriteRAM(LCD_RAMRegister_3,0x10)里面置高无法点亮，很疑惑。
3)//COM0--PA4，COM1--PA5，COM2--PA6，COM3--PD1，SEG8--PD2，SEG9--PD3，
用示波器看COM0--PA4，SEG8--PD2，SEG9--PD3，均为方波，但是COM1--PA5，COM2--PA6，COM3--PD1，显示波形不正常。下面是波形图，还请多多指教。