niekiran / masteringmcu Goto Github PK

The tutorial shows it correctly, but the committed code has issues. I was confused by this mismatch while comparing the code. This is as shown in the tutorial:

/*********************************************************
 * @fn		- GPIO_IRQHandling
 * @brief		- Interrupt handling
 *
 * @param[in]	-
 * @param[in]	-
 *
 * @return		- 
 *
 * @notes		-
 * /
void GPIO_IRQHandling(uint8_t PinNumber)
{
 //clear the EXTIPR register
	if(EXTI ->PR |= (1 << PinNumber))
	{
		//clear
		EXTI ->PR &= ~(1 << PinNumber);
	}
}

Shouldn't this actually be:
F_part = ((( F_part * 8)+ 50) / 100)& ((uint8_t)0x0F);

Because BRR register DIV_Fraction[3:0] always has 4 bits.

I am at lesson 3 and it said to clone?

I do not know hoe to find your respond to this so pleas explain tis also?

This is my email [email protected] explain how to find your response to this.

Thank you,
ƒg

In my microcontroller the pins are started by default as an analog mode (to save energy), so it would be interesting to ensure that the pin is configured as an input before starting the interrupt configuration process.

Just by adding this line:

//Configure GPIO as input
pGPIOHandle->pGPIOx->MODER &= ~( 0x3 << (2 * pGPIOHandle->GPIO_PinConfig.GPIO_PinNumber));

For example, below evaluates to 0x18
#define SPI_REG_CR1_BR_PCLK_DIV_16 ( ( uint32_t) 3 << 3 )

and in hal, we have error check condition which checks 0x18> 7 sets default CR1 with 0.
if(pre_scalar_value > 7 )
SPIx->CR1 |= (0x00 << 3); //if pre_scalar_value > 7,then use default . that is 0

In order to fix, it is just enough to have below change
#define SPI_REG_CR1_BR_PCLK_DIV_16 3

I don't understand how the SPI handle is passed to the SPI interrupt. Relevant lines in code
file: stm32f407xx_spi_driver.c

void SPI_IRQHandling(SPI_Handle_t *pHandle)
{

	uint8_t temp1 , temp2;
	//first lets check for TXE
	temp1 = pHandle->pSPIx->SR & ( 1 << SPI_SR_TXE);
	temp2 = pHandle->pSPIx->CR2 & ( 1 << SPI_CR2_TXEIE);

	if( temp1 && temp2)
	{
		//handle TXE
		spi_txe_interrupt_handle(pHandle);
	}

	// check for RXNE
	temp1 = pHandle->pSPIx->SR & ( 1 << SPI_SR_RXNE);
	temp2 = pHandle->pSPIx->CR2 & ( 1 << SPI_CR2_RXNEIE);

	if( temp1 && temp2)
	{
		//handle RXNE
		spi_rxne_interrupt_handle(pHandle);
	}

	// check for ovr flag
	temp1 = pHandle->pSPIx->SR & ( 1 << SPI_SR_OVR);
	temp2 = pHandle->pSPIx->CR2 & ( 1 << SPI_CR2_ERRIE);

	if( temp1 && temp2)
	{
		//handle ovr error
		spi_ovr_err_interrupt_handle(pHandle);
	}


}

I'm architecting a similar application and need to pass SPI information from various applications. I'm using a different controller (dsPIC33). I do not understand how the different SPI handles declared in my application is passed to the interrupt context.

This caught my attention -> line 130 SYSCFG->EXTICR[temp1] = portcode << ( temp2 * 4);
in my opinion it should be SYSCFG->EXTICR[temp1] |= portcode << ( temp2 * 4);

I am trying to interface GSM with STM32L151, Can you please suggest me how to send AT commands to GSM Module.
Thank you.

in line 566 else if(IRQNumber >= 6 && IRQNumber < 96 ) should be else if(IRQNumber >= 64 && IRQNumber < 96 )