Posted on May 18, 2012 at 19:45 Hi,
FSMC can manage either 8 bit or 16 bit data.
If you starting from STM324xg_eval_lcd.c, I suggest you some starter point to try with your ILI9325/8 bit TFT
1) Remove R50 to avoid FSMC_NWE conflict with USB overcurrent chip output
2) insert this line at begin to write register in your base address and data 64Kbyte later (A16 go high only when you write data and stay low when you write reg)
__IO uint8_t * LCD_LCD_REG=0x68000000;
__IO uint8_t * LCD_LCD_RAM=0x68010000; //A16 <->RS pin: adding 64Kbytes
3) split low level write function into 8 bit (MSByte first)
void LCD_WriteReg(uint8_t LCD_Reg, uint16_t LCD_RegValue)
{
/* Write 16-bit Index, then Write Reg */
*LCD_LCD_REG = 0;
*LCD_LCD_REG = LCD_Reg;
/* Write 16-bit Reg */
*LCD_LCD_RAM = (uint8_t)(LCD_RegValue>>8);
*LCD_LCD_RAM = (uint8_t)(LCD_RegValue & 0xff);
}
void LCD_WriteRAM_Prepare(void)
{
*LCD_LCD_REG = 0;
*LCD_LCD_REG = LCD_REG_34;
}
void LCD_WriteRAM(uint16_t RGB_Code)
{
/* Write 16-bit GRAM Reg */
*LCD_LCD_RAM = (uint8_t) (RGB_Code>>8);
*LCD_LCD_RAM = (uint8_t) (RGB_Code & 0xff);
}
4) Kill any read attempt: example for STM324xG_LCD_Init
void STM324xG_LCD_Init(void)
{
__IO uint32_t lcdid = 0;
/* Configure the LCD Control pins --------------------------------------------*/
LCD_CtrlLinesConfig();
/* Configure the FSMC Parallel interface -------------------------------------*/
LCD_FSMCConfig();
_delay_(5); /* delay 50 ms */
/* Read the LCD ID */
lcdid = LCD_ReadReg(0x00);
####### this line is to kill !!!! #####Force the init 9325 sequence with:
lcdid=0x9325; //lcdid = LCD_ReadReg(0x00); #### we have a ILI9325 chip (?) ####
Enjoy !!
Alessandro.
