Posted on February 17, 2014 at 23:39
Hello,
can you help me with touching controller and STM32F4 Discovery kit? I use controller XPT2046 with SPI and I want use SPI2. I know, that SPI 2 is on pins PC2, PC3 and PB Is it true? I init this pins in touch_init function and the function not working still. I'm using with FreeRTOS. Is it problem?
Here is my code for init:
void
touch_init(
void
)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_25MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_10;
GPIO_Init(GPIOB,&GPIO_InitStruct);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_SPI2);
//SCLK
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_25MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_3;
GPIO_Init(GPIOC,&GPIO_InitStruct);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource2, GPIO_AF_SPI2);
//MISO
GPIO_PinAFConfig(GPIOC, GPIO_PinSource3, GPIO_AF_SPI2);
//MOSI
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
SPI_I2S_DeInit(SPI2);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
//SPI_CPOL_Low SPI_CPOL_High
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
//SPI_NSS_Hard //SPI_NSS_Soft
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
//16
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2,&SPI_InitStructure);
SPI_Cmd(SPI2,ENABLE);
//CS
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_14;
// 3
GPIO_Init(GPIOB,&GPIO_InitStruct);
// d
T_DCS();
//T_PEN
GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IN;
GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Pin=GPIO_Pin_6;
GPIO_Init(GPIOD,&GPIO_InitStruct);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource6);
EXTI_InitStructure.EXTI_Line = EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
And then I write and read data by this function:
unsigned
char
SPI_WriteByte(u8 num)
{
unsigned
char
Data = 0;
while
(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE)==RESET);
SPI_I2S_SendData(SPI2,num);
while
(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_RXNE)==RESET);
Data = SPI_I2S_ReceiveData(SPI2);
return
Data;
}
Can you help me please?
#xpt2046 #spi #stm32f4
