Rohit Nimkar csrohit

🏠

Working from home

Embedded Systems Developer under the sun & graphics programmer under the moon

csrohit / 1output-compare

Last active May 13, 2025 10:35

This gist if for article on Timer3 Output Compare

csrohit / 1timer-delay

Last active May 12, 2025 07:05

This gist is for timer delay

csrohit / address.c

Last active January 15, 2024 16:20

scan-adc

	/* Set peripheral address as ADC data register */
	DMA1_Channel1->CPAR = (uint32_t)&ADC1->DR;

	/* Set memory address as adc_value buffer */
	DMA1_Channel1->CMAR = (uint32_t)adc_value;

	/* Set number of transfers */
	DMA1_Channel1->CNDTR = 2U;

csrohit / shadow-matrix.c

Created January 1, 2024 19:24

Projective Shadows in OpenGL

	void setShadowMatrix(GLfloat destMat, float lightPos, double *plane)
	{
	GLfloat dot;

	// dot product of plane and light position
	dot = plane[0] * lightPos[0] + plane[1] * lightPos[1] + plane[2] * lightPos[2];

	// first column
	destMat[0] = dot - plane[0] * lightPos[0];
	destMat[4] = 0.0f - lightPos[0] * plane[1];

csrohit / init_adc.c

Last active February 19, 2023 06:53

supporting gist for adc medium article

	void init_adc(void){
	/* Set ADC prescalar*/
	RCC->CFGR \|= RCC_CFGR_ADCPRE_DIV6;

	/* Enable clock for ADC & PortA */
	RCC->APB2ENR \|= RCC_APB2ENR_ADC1EN \| RCC_APB2ENR_IOPAEN;

	/* COnfigure PA0 in analog input mode */
	GPIOA->CRL &= ~(GPIO_CRL_CNF0 \| GPIO_CRL_MODE0);

csrohit / ahb2-div.c

Last active January 9, 2023 17:23

Supporting gist for clock configuration article

	RCC->CFGR \|= RCC_CFGR_PPRE1_2;
	RCC->CFGR \|= RCC_CFGR_PLLXTPRE_HSE;

csrohit / circular-interrupt.c

Last active October 30, 2023 10:22

Supporting gist for circular DMA operation

	// enable circular mode
	DMA1_Channel4->CCR \|= DMA_CCR_CIRC;

	// enable interrpt after full transfer
	DMA1_Channel4->CCR \|= DMA_CCR_TCIE;

csrohit / constructor.cpp

Last active December 21, 2022 09:11

Supporting code for memory mapped objects

	USART()
	{
	if (this == reinterpret_cast<USART *>(USART1))
	{
	// enable clock for GPIOA and USART1
	RCC->APB2ENR \|= RCC_APB2ENR_USART1EN \| RCC_APB2ENR_IOPAEN;

	// reset pin configurations for PA9 and PA10
	GPIOA->CRH &= ~(GPIO_CRH_MODE10 \| GPIO_CRH_MODE9 \| GPIO_CRH_CNF10 \| GPIO_CRH_CNF9);

csrohit / Linker scripts

Last active December 2, 2022 13:24

Supporting code for article on linker script

csrohit / code_size_optimization

Last active December 1, 2022 09:03

Gist for supporting article on optimising code size

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