stm32 FSMC 读取TFT驱动IC的ID

ftpwww · 发表于 2014-8-6 11:22:02

/*
LCD_BL对应PC7
LCD_CS接了一个译码器，由FSMC_A22,FSMC_A21,FSMC_NE4三个引脚控制，分别对应PE6,PE5，PG12
LCD_RS对应PF0，即FSMC_A0
LCD_WR对应PD5，即FSMC_NWE
LCD_RD对应PD4,即FSMC_NOE
LCD_D[15:0]对应FSMCD15-FSMC_D0
*/

#define LCD_BASE ((uint32_t)(0x6C000000 | 0x00000000)) //用的是FSMC_A0
#define LCD ((LCD_TypeDef *) LCD_BASE)

void LCD_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
FSMC_NORSRAMTimingInitTypeDef readWriteTiming;
FSMC_NORSRAMTimingInitTypeDef writeTiming;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOF|RCC_APB2Periph_GPIOG,ENABLE);

//PORTC
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

//PORTG
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOG, &GPIO_InitStructure);

//PORTA
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//PORTD
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_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);

//PORTE
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|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_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);

//PORTF
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOF, &GPIO_InitStructure);

readWriteTiming.FSMC_AddressSetupTime = 0x01;
readWriteTiming.FSMC_AddressHoldTime = 0x00;
readWriteTiming.FSMC_DataSetupTime = 0x0f;
readWriteTiming.FSMC_BusTurnAroundDuration = 0x00;
readWriteTiming.FSMC_CLKDivision = 0x00;
readWriteTiming.FSMC_DataLatency = 0x00;
readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A;


writeTiming.FSMC_AddressSetupTime = 0x00;
writeTiming.FSMC_AddressHoldTime = 0x00;
writeTiming.FSMC_DataSetupTime = 0x03;
writeTiming.FSMC_BusTurnAroundDuration = 0x00;
writeTiming.FSMC_CLKDivision = 0x00;
writeTiming.FSMC_DataLatency = 0x00;
writeTiming.FSMC_AccessMode = FSMC_AccessMode_A;

FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM4;
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode =FSMC_BurstAccessMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Enable;
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming;
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &writeTiming;

GPIO_ResetBits(GPIOG, GPIO_Pin_12);//译码器的操作，使得LCD_CS为低电平
GPIO_ResetBits(GPIOE, GPIO_Pin_5);//译码器的操作，使得LCD_CS为低电平
GPIO_ResetBits(GPIOE, GPIO_Pin_6);//译码器的操作，使得LCD_CS为低电平

FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM4, ENABLE);

GPIO_SetBits(GPIOC, GPIO_Pin_7);//点亮液晶背光

delay_ms(50);
LCD_WriteReg(0x0000,0x0001);
delay_ms(50);
lcddev.id = LCD_ReadReg(0x0000);
lcddev.id = LCD_ReadReg(0x0000);
printf(" LCD ID:%x\r\n",lcddev.id);

那个FSMC的初始话是完全按照原子的程序，打印出来的ID始终都是0，哪位大神能够帮忙解答啊？谢谢了

rgzdb · 发表于 2014-8-6 13:23:59

你的屏主控的型号，不同的屏读ID的寄存器不一样，看手册。你用的什么开发板，如果不是原子的Fsmc地址不一定相同，看原理图。编译时不要开优化，正常后在试。

w0rmis20 · 发表于 2014-8-6 15:11:56

你的屏幕如果是在原子那买的就没有问题。。如果自己买的，很可能只支持8位扩充到16位模式的那那种屏幕是读不到数据的。。。。

ftpwww · 发表于 2014-8-6 15:43:38

谢谢各位的解答。这个屏幕是很早以前买的开发板上面带的，也不知道是不是原来买开发板配的那块，现在问卖家，他说是SSD1289，也不知道是不是好的，目前读不到它的ID，我看了一些资料，应该可以通过读0x00000000寄存器读ID，用的不是原子的开发板，仔细看了原理图的，引脚那些都做了修改，RS用的是FSMC_A0。FSMC初始化那部分，没有改过，也看不懂。