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最近經理通知要做項目了，讓我選型一個LCD開始試著做下。這是我用仿真實現的一個smt32的硬件SPI1來驅動的ST7735R，難度挺小的，因為大部分的代碼LCD的廠商已經給我們提供了，我們主要修改成硬件SPI來驅動就好了。 此次仿真上面有2個問題，不知道是代碼的問題還是仿真圖上的問題。第一個問題是仿真運行時有時會出通信數據傳輸問題，導致指令越界報警，這個可能是SPI不穩定導致的；第二個問題是在改用SPI2或者SPI3來驅動沒有任何反應，猜測是代碼時鐘沒開對或者仿真圖上面還要加上具體晶振。 代碼工程和仿真工程都已壓縮打包，可放心下載。。。
先貼上仿真實現圖：
再貼上部分代碼：
/**ST7735驅動**/ #include "ST7735.h" #include "usart.h" u16 BACK_COLOR, POINT_COLOR; //背景色，畫筆色
void WriteCommand_7735(u8 CmdData) //寫指令 { SPI_LCD_CS_LOW; //片選 SPI_LCD_COMMAND_W;//寫指令 SPI_I2S_SendData(LCD_SPIx,CmdData); while (SPI_I2S_GetFlagStatus(LCD_SPIx, SPI_I2S_FLAG_TXE) == RESET){} SPI_LCD_CS_HIGH; }
void WriteDate_7735(u8 Data) //寫8位數據 { SPI_LCD_CS_LOW; //片選 SPI_LCD_DATA_W;//寫數據 SPI_I2S_SendData(LCD_SPIx,Data); while(SPI_I2S_GetFlagStatus(LCD_SPIx, SPI_I2S_FLAG_TXE) == RESET){} SPI_LCD_CS_HIGH; }
void WriteDate16(int data) //寫16位數據 { WriteDate_7735(data>>8); WriteDate_7735(data); }
void LCD_Init(void) { LCD_RES_HIGH; delay_ms(5); LCD_RES_LOW; delay_ms(5); LCD_RES_HIGH; SPI_LCD_CS_HIGH; delay_ms(5); SPI_LCD_CS_LOW; //打開片選使能
WriteCommand_7735(0x11); //Sleep out delay_ms(120); //Delay 120ms //------------------------------------ST7735S Frame Rate-----------------------------------------// WriteCommand_7735(0xB1); WriteDate_7735(0x05);
WriteCommand_7735(0x11);//Sleep exit delay_ms (120); //ST7735R Frame Rate WriteCommand_7735(0xB1); WriteDate_7735(0x01);
WriteDate_7735(0x2C); WriteDate_7735(0x2D); WriteCommand_7735(0xB2); WriteDate_7735(0x01); WriteDate_7735(0x2C); WriteDate_7735(0x2D); WriteCommand_7735(0xB3); WriteDate_7735(0x01); WriteDate_7735(0x2C); WriteDate_7735(0x2D); WriteDate_7735(0x01); WriteDate_7735(0x2C); WriteDate_7735(0x2D);
WriteCommand_7735(0xB4); //Column inversion WriteDate_7735(0x07); //ST7735R Power Sequence WriteCommand_7735(0xC0); WriteDate_7735(0xA2); WriteDate_7735(0x02); WriteDate_7735(0x84); WriteCommand_7735(0xC1); WriteDate_7735(0xC5); WriteCommand_7735(0xC2); WriteDate_7735(0x0A); WriteDate_7735(0x00); WriteCommand_7735(0xC3); WriteDate_7735(0x8A); WriteDate_7735(0x2A); WriteCommand_7735(0xC4); WriteDate_7735(0x8A); WriteDate_7735(0xEE); WriteCommand_7735(0xC5); //VCOM WriteDate_7735(0x0E); WriteCommand_7735(0x36); //MX, MY, RGB mode WriteDate_7735(0xC8);
//ST7735R Gamma Sequence WriteCommand_7735(0xe0); WriteDate_7735(0x0f); WriteDate_7735(0x1a); WriteDate_7735(0x0f); WriteDate_7735(0x18); WriteDate_7735(0x2f); WriteDate_7735(0x28); WriteDate_7735(0x20); WriteDate_7735(0x22); WriteDate_7735(0x1f); WriteDate_7735(0x1b); WriteDate_7735(0x23); WriteDate_7735(0x37); WriteDate_7735(0x00);
WriteDate_7735(0x07); WriteDate_7735(0x02); WriteDate_7735(0x10); WriteCommand_7735(0xe1); WriteDate_7735(0x0f); WriteDate_7735(0x1b); WriteDate_7735(0x0f); WriteDate_7735(0x17); WriteDate_7735(0x33); WriteDate_7735(0x2c); WriteDate_7735(0x29); WriteDate_7735(0x2e); WriteDate_7735(0x30); WriteDate_7735(0x30); WriteDate_7735(0x39); WriteDate_7735(0x3f); WriteDate_7735(0x00); WriteDate_7735(0x07); WriteDate_7735(0x03); WriteDate_7735(0x10);
WriteCommand_7735(0x2a); WriteDate_7735(0x00);WriteDate_7735(0x00); WriteDate_7735(0x00);WriteDate_7735(0x7f); WriteCommand_7735(0x2b); WriteDate_7735(0x00);WriteDate_7735(0x00); WriteDate_7735(0x00);WriteDate_7735(0x7f);
/*下面這2個指令對ST7735R好像不起作用，仿真會報警告，應該是沒有這2條指令*/ //WriteCommand_7735(0xF0); //Enable test command //WriteDate_7735(0x01); //WriteCommand_7735(0xF6); //Disable ram power save mode //WriteDate_7735(0x00); WriteCommand_7735(0x3A); //65k mode WriteDate_7735(0x05); WriteCommand_7735(0x29); //Display on WriteCommand_7735(0x2C); }
代碼就貼這么多吧，具體的下載來看吧，網上基于這款LCD的項目挺少的。特別注意點是設置SPI的CS腳，費了我一天時間在那測試，一直沒找到錯誤點，當時都快哭了，終于還是做出來了，希望以后的同學仿真少走彎路吧。CS腳（片選）一定要設定成復用推挽輸出，并且不要設置到SPI的NSS腳上，即PA4，接上反正是運行不起來。。。
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