XPT2046 is actually an AD converter, so it is suitable for initialization settings, and the specific initialization is actually the initialization of the microcontroller IO and the initialization of the SPI.
This time STM32 is operated using SPI1. The SPI settings have already been mentioned in the previous lessons. I will not repeat them here. The specific code for initialization is as follows:
/************************************************* *********************
*FuncTIonName:TOUCH_Init
*DescripTIon: Initialize the touch screen
*Input:None
*Output:None
*Return:None
************************************************** ********************/
voidTOUCH_Init(void)
{
GPIO_InitTypeDefGPIO_InitStructure;
/*SPI IO port and SPI peripheral open clock */RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOD, ENABLE);
/*TOUCH-CS IO port setting */GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/*TOUCH-PEN IO port setting */GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
GPIO_Init(GPIOD, & GPIO_InitStructure); SPI1_Config();
/* To use FLASH to store calibration parameters, so be careful to initialize */ before
/*Check if there is correction parameter*/
FLASH_ReadData(&TouchAdj.posState, TOUCH_ADJ_ADDR, sizeof(TouchAdj));
If(TouchAdj.posState!=TOUCH_ADJ_OK)
{
TOUCH_Adjust();//correction
}
}
In this function, the initialization function of SPI1 is called, and the calibration procedure of the touch screen is shown below.
Initialization procedures, correction principles we will talk about later.
/************************************************* *********************
*FuncTIonName: SPI1_Config
*DescripTIon: Initialize SPI2
*Input:None
*Output:None
*Return:None
************************************************** *******************/
voidSPI1_Config(void)
{
GPIO_InitTypeDefGPIO_InitStructure; SPI_InitTypeDefSPI_InitStructure;
/*SPI IO port and SPI peripheral open clock */RCC_APB2PeriphClockCmd (RCC_APB2Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd (RCC_APB2Periph_SPI1, ENABLE);
/*SPI IO port setting*/
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_SetBits(GPIOA, GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7); // PA5.6.7 pull-up
/************************************************* *******************/
/*******************Set SPI parameters ************************** *********/
/************************************************* ******************** / SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // select full duplex mode SPI
SPI_InitStructure.SPI_Mode=SPI_Mode_Master;//Host mode SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b; //8-bit SPISPI_InitStructure.SPI_CPOL=SPI_CPOL_High; // Clock floating high SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge; // Collect data SPI_InitStructure on the second clock. SPI_NSS=SPI_NSS_Soft;//Nss uses software control
/*Select the baud rate prescaler to 256*/
SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_256; SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;//Transfer from the highest bit
SPI_InitStructure.SPI_CRCPolynomial=7;
SPI_Cmd (SPI1, ENABLE); SPI_Init (SPI1, & SPI_InitStructure);
}
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