基于STM32F103ZET6使用FSMC驱动TFT的学习 (四)

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EEFOCUS小白发布时间：2015-4-1 10:12

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本帖最后由 EEFOCUS小白于 2015-4-1 10:13 编辑

现在明白了我们的bit17对应的是FSMC的bit16，也就是A16了，所以我们的硬件连线应该是PA16了，也就是说HADDR
信号线是需要转换到外部存储器的内部AHB地址线，是字节地址。

给地址、将地址映射到外存储器（由HADDR的A25--A1映射到A24---A0）

注意点就是这个地方了，其他的时序问题和前面用IO模拟是差不多的，唯一的好处就是，我们有很多控制信号就不需要管了。最后贴上代码吧

/*******************************************************************************
* Function Name : LCD_WriteReg
* Description : Writes to the selected LCD register.
* Input : - LCD_Reg: address of the selected register.
* - LCD_RegValue: value to write to the selected register.
* Output : None
* Return : None
*******************************************************************************/
void LCD_WriteReg(unsigned char LCD_Reg,unsigned int LCD_RegValue)
{
/* Write 16-bit Index, then Write Reg */
LCD->LCD_REG = LCD_Reg; //这里表示写寄存器
/* Write 16-bit Reg */
LCD->LCD_RAM = LCD_RegValue; //这里表示写寄存器的值(也就是数据)
}
/*******************************************************************************
* Function Name : LCD_ReadReg
* Description : Reads the selected LCD Register.
* Input : None
* Output : None
* Return : LCD Register Value.
*******************************************************************************/
u16 LCD_ReadReg(unsigned char LCD_Reg)
{
/* Write 16-bit Index (then Read Reg) */
LCD->LCD_REG = LCD_Reg; //这里表示先写寄存器
/* Read 16-bit Reg */
return (LCD->LCD_RAM); //读取值
}
/*******************************************************************************
* Function Name : LCD_WriteRAM_Prepare
* Description : Prepare to write to the LCD RAM.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void LCD_WriteRAM_Prepare(void)
{
LCD->LCD_REG = R34;
}
/*******************************************************************************
* Function Name : LCD_WriteRAM
* Description : Writes to the LCD RAM.
* Input : - RGB_Code: the pixel color in RGB mode (5-6-5).
* Output : None
* Return : None
*******************************************************************************/
void LCD_WriteRAM(u16 RGB_Code)
{
/* Write 16-bit GRAM Reg */
LCD->LCD_RAM = RGB_Code;
}
/*******************************************************************************
* Function Name : LCD_ReadRAM
* Description : Reads the LCD RAM.
* Input : None
* Output : None
* Return : LCD RAM Value.
*******************************************************************************/
unsigned int LCD_ReadRAM(void)
{
unsigned int dummy;
/* Write 16-bit Index (then Read Reg) */
LCD->LCD_REG = R34; /* Select GRAM Reg */
/* Read 16-bit Reg */
dummy = LCD->LCD_RAM;
return dummy;
}
/*******************************************************************************
* Function Name : LCD_SetCursor
* Description : Sets the cursor position.
* Input : - Xpos: specifies the X position.
* - Ypos: specifies the Y position.
* Output : None
* Return : None
*******************************************************************************/
void LCD_SetCursor(unsigned int Xpos, unsigned int Ypos)
{
LCD_WriteReg(0x06,Ypos>>8);
LCD_WriteReg(0x07,Ypos);
LCD_WriteReg(0x02,Xpos>>8);
LCD_WriteReg(0x03,Xpos);
}

/******************************************************************************** Function Name : LCD_WriteReg* Description : Writes to the selected LCD register.* Input : - LCD_Reg: address of the selected register.* - LCD_RegValue: value to write to the selected register.* Output : None* Return : None*******************************************************************************/void LCD_WriteReg(unsigned char LCD_Reg,unsigned int LCD_RegValue){ /* Write 16-bit Index, then Write Reg */ LCD->LCD_REG = LCD_Reg; //这里表示写寄存器 /* Write 16-bit Reg */ LCD->LCD_RAM = LCD_RegValue; //这里表示写寄存器的值(也就是数据)}/******************************************************************************** Function Name : LCD_ReadReg* Description : Reads the selected LCD Register.* Input : None* Output : None* Return : LCD Register Value.*******************************************************************************/u16 LCD_ReadReg(unsigned char LCD_Reg){ /* Write 16-bit Index (then Read Reg) */ LCD->LCD_REG = LCD_Reg; //这里表示先写寄存器 /* Read 16-bit Reg */ return (LCD->LCD_RAM); //读取值}/******************************************************************************** Function Name : LCD_WriteRAM_Prepare* Description : Prepare to write to the LCD RAM.* Input : None* Output : None* Return : None*******************************************************************************/void LCD_WriteRAM_Prepare(void){ LCD->LCD_REG = R34;}/******************************************************************************** Function Name : LCD_WriteRAM* Description : Writes to the LCD RAM.* Input : - RGB_Code: the pixel color in RGB mode (5-6-5).* Output : None* Return : None*******************************************************************************/void LCD_WriteRAM(u16 RGB_Code) { /* Write 16-bit GRAM Reg */ LCD->LCD_RAM = RGB_Code;}/******************************************************************************** Function Name : LCD_ReadRAM* Description : Reads the LCD RAM.* Input : None* Output : None* Return : LCD RAM Value.*******************************************************************************/unsigned int LCD_ReadRAM(void){ unsigned int dummy; /* Write 16-bit Index (then Read Reg) */ LCD->LCD_REG = R34; /* Select GRAM Reg */ /* Read 16-bit Reg */ dummy = LCD->LCD_RAM; return dummy;}/******************************************************************************** Function Name : LCD_SetCursor* Description : Sets the cursor position.* Input : - Xpos: specifies the X position.* - Ypos: specifies the Y position. * Output : None* Return : None*******************************************************************************/void LCD_SetCursor(unsigned int Xpos, unsigned int Ypos){ LCD_WriteReg(0x06,Ypos>>8); LCD_WriteReg(0x07,Ypos); LCD_WriteReg(0x02,Xpos>>8); LCD_WriteReg(0x03,Xpos); }

对比下之前的用IO驱动的方式，确实是少了一些控制信号！