RM0367 Rev 7 985/1043
RM0367 Code examples
1020
A.6 DMA
A.6.1 DMA Channel Configuration sequence code example
/* (1) Enable the peripheral clock on DMA */
/* (2) Remap DMA channel1 on ADC (reset value) */
/* (3) Enable DMA transfer on ADC */
/* (4) Configure the peripheral data register address */
/* (5) Configure the memory address */
/* (6) Configure the number of DMA tranfer to be performs on channel 1 */
/* (7) Configure increment, size and interrupts */
/* (8) Enable DMA Channel 1 */
RCC->AHBENR |= RCC_AHBENR_DMA1EN; /* (1) */
//DMA1_CSELR->CSELR &= (uint32_t)(~DMA_CSELR_C1S); /* (2) */
ADC1->CFGR1 |= ADC_CFGR1_DMAEN; /* (3) */
DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR)); /* (4) */
DMA1_Channel1->CMAR = (uint32_t)(ADC_array); /* (5) */
DMA1_Channel1->CNDTR = 3; /* (6) */
DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0 \
| DMA_CCR_TEIE | DMA_CCR_TCIE ; /* (7) */
DMA1_Channel1->CCR |= DMA_CCR_EN; /* (8) */
/* Configure NVIC for DMA */
/* (1) Enable Interrupt on DMA Channel 1 */
/* (2) Set priority for DMA Channel 1 */
NVIC_EnableIRQ(DMA1_Channel1_IRQn); /* (1) */
NVIC_SetPriority(DMA1_Channel1_IRQn,0); /* (2) */
A.7 Interrupts and event
A.7.1 NVIC initialization example
/* Configure NVIC for ADC */
/* (1) Enable Interrupt on ADC */
/* (2) Set priority for ADC */
NVIC_EnableIRQ(ADC1_COMP_IRQn); /* (1) */
NVIC_SetPriority(ADC1_COMP_IRQn,0); /* (2) */
A.7.2 Extended interrupt selection code example
/* (1) Enable the peripheral clock of GPIOA */
/* (2) Select input mode (00) on GPIOA pin 0 */
/* (3) Select Port A for pin 0 extended interrupt by writing 0000
in EXTI0 (reset value) */
/* (4) Configure the corresponding mask bit in the EXTI_IMR register */
To Next Page
Loading...
Need help?
General
