STM32L152 LCD driver

moran · ‎2015-04-16

Posted on April 16, 2015 at 10:00

Hello,

I'm working on a custom board STM32l152 that include LCD (1/4 duty & 1/3 bias)

I just want to enable all signal ( 64 = 16 * 4Com ) in order to check the screen.

somehow only 1 (of 4) raw is working.

this is my code :

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/*!< Enable GPIOA, GPIOB, GPIOC AHB Clocks */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC, ENABLE);

//Segments 0 - 4

GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_LCD);

//Segments 5 - 6

GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource5, GPIO_AF_LCD);

//Segments 7 - 8

GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_LCD);

//Segments 9 - 12

GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_LCD);

//Segments 13 - 15

GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_LCD);

//COM 0-3

GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource10,GPIO_AF_LCD);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_LCD);

a_opLcdControl->m_iLcdGPIO.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_6 |

GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10;

a_opLcdControl->m_iLcdGPIO.GPIO_Speed = GPIO_Speed_40MHz;

a_opLcdControl->m_iLcdGPIO.GPIO_Mode = GPIO_Mode_AF;

a_opLcdControl->m_iLcdGPIO.GPIO_OType = GPIO_OType_PP;

a_opLcdControl->m_iLcdGPIO.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOA, &a_opLcdControl->m_iLcdGPIO);

a_opLcdControl->m_iLcdGPIO.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_9 |

GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_Init(GPIOB, &a_opLcdControl->m_iLcdGPIO);

a_opLcdControl->m_iLcdGPIO.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 |

GPIO_Pin_8 | GPIO_Pin_9;

GPIO_Init(GPIOC, &a_opLcdControl->m_iLcdGPIO);

// LCD_GPIOConfig(); /*!< Configure the LCD Glass GPIO pins */

/*!< Configure the LCD interface -------------------------------------------*/

RCC_APB1PeriphClockCmd(RCC_APB1Periph_LCD, ENABLE); /*!< Enable LCD APB1 Clock */

a_opLcdControl->m_iLcdInit.LCD_Prescaler = LCD_Prescaler_8;//LCD_Prescaler_8;

a_opLcdControl->m_iLcdInit.LCD_Divider = LCD_Divider_16;

a_opLcdControl->m_iLcdInit.LCD_Duty = LCD_Duty_1_4;

a_opLcdControl->m_iLcdInit.LCD_Bias = LCD_Bias_1_3;

a_opLcdControl->m_iLcdInit.LCD_VoltageSource = LCD_VoltageSource_Internal;//LCD_VoltageSource_External;//LCD_VoltageSource_Internal;

LCD_Init(&a_opLcdControl->m_iLcdInit);

/*!< Configure the Pulse On Duration */

LCD_PulseOnDurationConfig(LCD_PulseOnDuration_2);

/*!< Configure the LCD Contrast (3.51V) */

LCD_ContrastConfig(LCD_Contrast_Level_7);

/*!< Wait Until the LCD FCR register is synchronized */

LCD_WaitForSynchro();

/*!< Enable LCD peripheral */

LCD_Cmd(ENABLE);

/*!< Wait Until the LCD is enabled */

while(LCD_GetFlagStatus(LCD_FLAG_ENS) == RESET)

{

}

/*!< Wait Until the LCD Booster is ready */

while(LCD_GetFlagStatus(LCD_FLAG_RDY) == RESET)

{

}

LCD_Write(LCD_RAMRegister_0, 0xffffffff);

LCD_UpdateDisplayRequest();

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Please advise, what wrong ?

Thanks,

Moran.

stm322399 · ‎2015-04-16

Posted on April 16, 2015 at 10:35

Did you try to write other LCD RAM registers, I see only a single of them accessed from your code ?

--

Laurent

moran · ‎2015-04-16

Posted on April 16, 2015 at 16:10

Thanks Laurent,

You right.

In order to operate all 4 COMs i have to write :

LCD_Write(LCD_RAMRegister_0, 0xffffffff);

LCD_Write(LCD_RAMRegister_2, 0xffffffff);

LCD_Write(LCD_RAMRegister_4, 0xffffffff);

LCD_Write(LCD_RAMRegister_6, 0xffffffff);

Thanks.