How to set up SPI? STM32h743ZI

I'm still beginner to programming STM32. I haven't been able to configure SPI for two weeks and don't understand what I am doing wrong. I dug up all the forums looking for an answer, but nothing helped to solve my problem. I checked the MOSI and SCK pin with an oscilloscope and there are no signals on these pins. I tried different ways to configure SPI but still nothing helped. Tried configuring for SPI1, SPI2, SPI3, SPI4, SPI5 etc, same problem. Everything works in HAL, but I want to understand what I am doing wrong using CMSIS. Please give me at least a little hint what I'm setting up wrong. I'm using STM32H743ZI debug board. I really hope for your help, thank you.

#include "main.h"
 
 
#define cs_set() GPIOC->BSRR |= GPIO_BSRR_BR11;
#define cs_reset() GPIOC->BSRR |= GPIO_BSRR_BS11;
 
void SPIinit (void);
void Settings7219 (void);
void SPITransmit (uint8_t adress, uint8_t data);
 
int main (void) {
	SPIinit();
	Settings7219();
	GPIOB->BSRR |= GPIO_BSRR_BS0;
	while(1){
 
	}
}
 
void SPITransmit (uint8_t adress, uint8_t data)
 {
	SPI3->CR1 |= SPI_CR1_CSTART;
	uint8_t tx_buffer[1] = {0};
	while (!(SPI3->SR & SPI_SR_TXP));
	cs_set(); // SS enable
	tx_buffer[0] = adress;
	SPI3->TXDR = tx_buffer[0];
	tx_buffer[0] = data;
	SPI3->TXDR = tx_buffer[0];
	cs_reset(); // SS disable
	SPI3->CR1 &= ~SPI_CR1_CSTART;
 }
 
void Settings7219 (void)
{
	SPITransmit(0x09, 0x00);       //  no decoding
	SPITransmit(0x0a, 0x01);       //  brightness
	SPITransmit(0x0b, 0x07);       //  scan limit = 8 LEDs
	SPITransmit(0x0c, 0x01);       //  power down =0,normal mode = 1
	SPITransmit(0x0f, 0x01);       //  no display test
}
 
 
 
 /*__________________________SPI_Conf____________________*/
void SPIinit (void){
	/*_______________________RCC_________________________*/
 
	RCC->AHB4ENR  |= RCC_AHB4ENR_GPIOCEN;
	RCC->AHB4ENR  |= RCC_AHB4ENR_GPIOBEN;
	RCC->APB1LENR |= RCC_APB1LENR_SPI3EN;
 
	/*_______________________SET_MODE_____________________*/
	GPIOC->MODER &= ~GPIO_MODER_MODE12;
	GPIOC->MODER &= ~GPIO_MODER_MODE11;
	GPIOC->MODER &= ~GPIO_MODER_MODE10;
	GPIOC->MODER |= GPIO_MODER_MODE12_1 | GPIO_MODER_MODE11_0 |  GPIO_MODER_MODE10_1;
	
	GPIOB->MODER &= ~GPIO_MODER_MODE0;
	GPIOB->MODER |= GPIO_MODER_MODE0_0;
	/*_____________________SET_AF_________________________*/
	GPIOC->AFR[1] |= GPIO_AFRH_AFSEL10_1 | GPIO_AFRH_AFSEL10_2;  // MOSI
	GPIOC->AFR[1] |= GPIO_AFRH_AFSEL12_1 | GPIO_AFRH_AFSEL12_2;  // SCK
 
	/*_____________________SET_SPI________________________*/
	SPI3->CFG1 |= SPI_CFG1_MBR_1;
	//SPI3->CFG1 |= SPI_CFG1_CRCEN;
	//SPI3->CFG1 |= SPI_CFG1_FTHLV_0;
	SPI3->CFG2 |= SPI_CFG2_MASTER;
	SPI3->CFG2 |= SPI_CFG2_COMM_0;
	SPI3->CFG2 |= SPI_CFG2_CPOL;
	//SPI3->CFG2 |= SPI_CFG2_SSOE;
	//SPI3->CFG2 |= SPI_CFG2_SSM;
	//SPI3->CFG2 |= SPI_CFG2_SSOM;
	//SPI3->CR2 |= SPI_CR2_TSIZE;
	//SPI3->CR2 |= SPI_CR2_TSER;
	//SPI3->IER |= SPI_IER_TXPIE;
	//SPI3->CR1 |= SPI_CR1_SSI;
	//SPI3->IER |= SPI_IER_TXTFIE;
	SPI3->CR1 |= SPI_CR1_SPE;
	NVIC_EnableIRQ(SPI3_IRQn);
}