uint32_t config_usart3(void)
{

//=============================================================================
// USART3 Related configuration
//=============================================================================
// enable clock
RCC->APB1ENR |= RCC_APB1ENR_USART3EN;


// 1) Setting UE, amd M bits
USART3-> CR1 |= 0x2000; // UE = 1

// 2) Programming number of stop bits if needed


// 3) Enable DMA if needed


// 4) set the Baud Rate
// BAUD = fck / ( 8 * (2 - OVER8) * USARTDIV )
// fck = 42MHz,
// OVER8 = 0
// Choose BAUD = 115200
// then: USARTDIV = fck / ( 8 * (2 -OVER8) * BAUD = 22.75
// BRR = (22 << 4) | ( 0.75 * 16) = 364,
// or: BRR = fck / BAUD = 42MHz / 115200 = 364
USART3->BRR = 364;


// enable transmitter
USART3->CR1 |= USART_CR1_TE;

// enable receiver
USART3->CR1 |= USART_CR1_RE;

return 0;
}

uint8_t mem_read_gyro(USART_TypeDef *USART_ID )
{

int i=0; // loop var


//send read buffer to USART
for(i=0;i<=17281024;i++)
{
// check if TXE bit is set
while((!(USART_ID->SR & USART_SR_TXE)) );


USART_ID->DR = 0x5d;//mem_gyro_buf[i]; // sending a byte
// check if TC bit is set
while((!(USART_ID->SR & USART_SR_TC)) );

}



return 0;
}