stm32使用fsmc总线驱动彩屏（基于神舟三号）

使用fsmc总线驱动彩屏的特点是速度快，与使用IO口模拟的时序的做法相比，FSMC稳定性好，缺点是配置复杂，较难理解。现将配置步骤总结如下：

1.配置引脚

配置函数如下：

void LCD_CtrlLinesConfig(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE |

RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG |

RCC_APB2Periph_AFIO, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 |

GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_14 |

GPIO_Pin_15;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOD, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |

GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 |

GPIO_Pin_15;

GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;

GPIO_Init(GPIOF, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;

GPIO_Init(GPIOG, &GPIO_InitStructure);

}

2.配置fsmc总线

void LCD_FSMAC_Config(void)

{

FSMC_NORSRAMInitTypeDef fsmc_config;

FSMC_NORSRAMTimingInitTypeDefp;

p.FSMC_AccessMode=FSMC_AccessMode_A;

p.FSMC_AddressHoldTime=0;

p.FSMC_AddressSetupTime=2;

p.FSMC_BusTurnAroundDuration=0;

p.FSMC_CLKDivision=0;

p.FSMC_DataLatency=0;

p.FSMC_DataSetupTime=2;

fsmc_config.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;

fsmc_config.FSMC_Bank=FSMC_Bank1_NORSRAM4;

fsmc_config.FSMC_BurstAccessMode=FSMC_BurstAccessMode_Disable;

fsmc_config.FSMC_DataAddressMux=FSMC_DataAddressMux_Disable;

fsmc_config.FSMC_ExtendedMode=FSMC_ExtendedMode_Disable;

fsmc_config.FSMC_MemoryDataWidth=FSMC_MemoryDataWidth_16b;

fsmc_config.FSMC_MemoryType=FSMC_MemoryType_PSRAM;

fsmc_config.FSMC_ReadWriteTimingStruct=&p;

fsmc_config.FSMC_WaitSignal=FSMC_WaitSignal_Disable;

fsmc_config.FSMC_WaitSignalActive=FSMC_WaitSignalActive_BeforeWaitState;

fsmc_config.FSMC_WaitSignalPolarity=FSMC_WaitSignalPolarity_Low;

fsmc_config.FSMC_WrapMode=FSMC_WrapMode_Disable;

fsmc_config.FSMC_WriteBurst=FSMC_WriteBurst_Disable;

fsmc_config.FSMC_WriteOperation=FSMC_WriteOperation_Enable;

fsmc_config.FSMC_WriteTimingStruct=&p;

FSMC_NORSRAMInit(&fsmc_config);

FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM4, ENABLE);

}

#define LCD_REG_ADDR (*((unsigned short int *)0x6c000000))

#define LCD_RAM_ADDR (*((unsigned short int *)0x6c000002))

#define Lcd_Reg (LCD_REG_ADDR)

#define Lcd_Ram (LCD_RAM_ADDR)

void LCD_WriteReg(u16 lcd_reg,u16 lcd_regval)

{

Lcd_Reg=lcd_reg;

Lcd_Ram=lcd_regval;

}

u16 LCD_ReadReg(u8 addr)

{

u16 data;

data=Lcd_Ram;

return data;

}

void LCD_WriteRAM(u16 color)

{

Lcd_Ram=color;

}

void LCD_WriteRAM_Prepare(void)

{

Lcd_Reg= R34;

}

void LCD_SetCursor(u16 Xpos, u16 Ypos)

{

LCD_WriteReg(0x06,Ypos>>8);

LCD_WriteReg(0x07,Ypos);

LCD_WriteReg(0x02,Xpos>>8);

LCD_WriteReg(0x03,Xpos);

}