i am trying to interfacing tsc2046 with stm32 using SPI communication, when i used NSS hardware at that time MOSI line continuously high & signal getting busy & code stuck.(when i used NSS software its working ok)

[TDK]

There are SPI examples you can follow in the CubeMX repository for your chip.

Including more detail in your post will lead to more helpful replies. If code is stuck, debug it, hit pause, determine why, and fix the issue.

[NBava.1]

//SPI CONFIGURATION

void TSC2046Config(void)//16.3.2022

{

GPIO_InitTypeDef GPIO_InitStructure;

 EXTI_InitTypeDef EXTI_InitStruct; //11.2.2020

 SPI_InitTypeDef SPI_InitStruct;

 NVIC_InitTypeDef NVIC_InitStructure;

 DMA_InitTypeDef DMA_InitStructure;                      //13.1.2020

 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_8;//16.3.2022 PENIRQ

 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_Init(GPIOB, &GPIO_InitStructure);  

 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource8);

 EXTI_InitStruct.EXTI_Line = EXTI_Line8;

 EXTI_InitStruct.EXTI_LineCmd = ENABLE;

 EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;

 EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling;

 EXTI_Init(&EXTI_InitStruct);  

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;// SPI2 SCK ;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

 GPIO_Init(GPIOD, &GPIO_InitStructure);

 GPIO_PinAFConfig(GPIOD, GPIO_PinSource3, GPIO_AF_SPI2);

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//SPI2MOSI;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//GPIO_PuPd_NOPULL;

 GPIO_Init(GPIOI, &GPIO_InitStructure);

 GPIO_PinAFConfig(GPIOI, GPIO_PinSource3, GPIO_AF_SPI2);

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;// SPI2 MISO;

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;//GPIO_PuPd_NOPULL;

 GPIO_Init(GPIOC, &GPIO_InitStructure);

 GPIO_PinAFConfig(GPIOC, GPIO_PinSource2, GPIO_AF_SPI2); 

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;  //SPI2 Slave select

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;

 //GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

 GPIO_Init(GPIOH, &GPIO_InitStructure);

 GPIO_SetBits(GPIOH, GPIO_Pin_5); 

 // enable peripheral clock

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

 SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // set to full duplex mode, seperate MOSI and MISO lines

 SPI_InitStruct.SPI_Mode = SPI_Mode_Master; // transmit in master mode, NSS pin has to be always high

 SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b; // one packet of data is 8 bits wide

 SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low; // clock is low when idle

 SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;//SPI_CPHA_2Edge; // data sampled at first edge

 SPI_InitStruct.SPI_NSS = SPI_NSS_Hard;//SPI_NSS_Soft | SPI_NSSInternalSoft_Set; // set the NSS management to internal and pull internal NSS high

 SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64; 

 SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;// data is transmitted MSB first

// SPI_InitStruct.SPI_CRCPolynomial = 7; //19.12.2019

 SPI_DataSizeConfig(SPI2,SPI_DataSize_8b);//20.12.2019

 SPI_Init(SPI2, &SPI_InitStruct); 

 SPI_Cmd(SPI2, ENABLE); // enable SPI3//19.12.2019

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;     //16.3.2022

 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;

 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

 NVIC_Init(&NVIC_InitStructure);  

}

uint16_t TSC2046_SendCommand(uint8_t cmd)

{

uint8_t spiBuf[3] = {0,0,0};

uint16_t return16=0;

int i=0;

_TS_CS_ENBALE;

spiBuf[0] = cmd;

     while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE));     

      SPI_I2S_SendData(SPI2,spiBuf[0]);

    for(i=0 ;i<2;i++)

{      

     // while(!SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE));

      spiBuf[i+1] = SPI_I2S_ReceiveData(SPI2);     

    }  

    //return16 = (spiBuf[1]<<4) + (spiBuf[2]>>4);   

    return16 = (spiBuf[1]<<4);

_TS_CS_DISABLE;

return return16;

}

uint16_t TSC2046_getRaw_Z(void)

{

return TSC2046_SendCommand(CMD_Z_AXIS | CMD_Default);

}

uint16_t TSC2046_getRaw_X(void)

{

return TSC2046_SendCommand(CMD_X_AXIS | CMD_Default);

}

//ii. get y-axis raw touch 12-bit value

uint16_t TSC2046_getRaw_Y(void)

{

return TSC2046_SendCommand(CMD_Y_AXIS | CMD_Default);

}

void main()

{

if(TouchDetected)

  {

   TouchDetected =0;

   Touchz = TSC2046_getRaw_Z(); //MOSI line is low but after transmitting data its high

   Touchx = TSC2046_getRaw_X(); //code stuck here bcz signal is continuously busy

   Touchy = TSC2046_getRaw_Y();    

  }  

}

[NBava.1]

in above image after transmitting data, DIN pin is low but in my case idle condition is low but after data transmission its show high

[NBava.1]

[NBava.1]

sir i am using HAL library its successfully work but when i trying without HAL library its not work. i was already share you the details , MOSI pin waveform & code flow.