SPI2 STM32H745

[fru999]

Hi everyone 

I can find help on how to connect SPI2 STM32H745. 

I have read the datasheet and did everything written on it.

Please can someone help me 

[AScha.3]

Hi,

>I have read the datasheet and did everything written on it.

What you did ?

>how to connect SPI2 STM32H745

In Cube - you set : SPI2 ? 

[fru999]

I initialize the SPI throught the CUBE MX 

I have my SPI_init and everything OSAKE.1 talks about but I have the impression my PIN are not the good ones.

[AScha.3]

The usual test for this: disable SPI setting, set PIN as gpio output and write in small loop hi/lo to the pin. Check with scope, what is on the pin then.

[Saket_Om]

Hello @fru999 

Below is an example of how you might set up and use SPI2 with the HAL library on an STM32H745 microcontroller.

 

Step 1: Initialize SPI2
First, you need to create an SPI_HandleTypeDef structure and initialize it with the desired SPI parameters.

#include "stm32h7xx_hal.h"

SPI_HandleTypeDef hspi2;

void SPI2_Init(void) {
 // SPI2 parameter configuration
 hspi2.Instance = SPI2;
 hspi2.Init.Mode = SPI_MODE_MASTER;
 hspi2.Init.Direction = SPI_DIRECTION_2LINES;
 hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
 hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
 hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
 hspi2.Init.NSS = SPI_NSS_SOFT;
 hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16; // Adjust the prescaler value as needed
 hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
 hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
 hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
 hspi2.Init.CRCPolynomial = 10;

 if (HAL_SPI_Init(&hspi2) != HAL_OK) {
 // Initialization Error
 Error_Handler();
 }
}

void Error_Handler(void) {
 // User can add his own implementation to report the HAL error return state
 while(1) {
 }
}

Step 2: Configure GPIO Pins for SPI2
You need to configure the GPIO pins for SPI2. This is typically done in the HAL_SPI_MspInit function, which is called by HAL_SPI_Init.

void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi) {
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 if(hspi->Instance==SPI2) {
 // Enable clocks for SPI2 and GPIO
 __HAL_RCC_SPI2_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();

 // SPI2 GPIO Configuration
 // PB13 ------> SPI2_SCK
 // PB14 ------> SPI2_MISO
 // PB15 ------> SPI2_MOSI
 GPIO_InitStruct.Pin = GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI2;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 }
}

Step 3: Transmit and Receive Data
To transmit and receive data using the HAL library, you can use the HAL_SPI_Transmit, HAL_SPI_Receive, or HAL_SPI_TransmitReceive functions.

uint8_t data_to_send = 0xAA; // Example data to send
uint8_t received_data = 0x00;

// Transmit data
if (HAL_SPI_Transmit(&hspi2, &data_to_send, 1, HAL_MAX_DELAY) != HAL_OK) {
 // Transmission Error
 Error_Handler();
}

// Receive data
if (HAL_SPI_Receive(&hspi2, &received_data, 1, HAL_MAX_DELAY) != HAL_OK) {
 // Reception Error
 Error_Handler();
}

 

For configuring the SPI2 peripheral on your STM32H745, I recommend using STM32CubeMX. This tool simplifies peripheral setup and pin configuration, ensuring an error-free initialization process.