May 2020
Intermediate to advanced
496 pages
13h 54m
English
Content preview from Hands-On RTOS with Microcontrollers
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A buffer-based driver with DMA
Here's an implementation of a driver with identical functionality to the one in the A buffer-based driver section. The difference is the DMA version of the driver doesn't interrupt the application every time a byte is received. The only interrupt generated is when the entire transfer is complete. To realize this driver, we only need to add the following ISR:
void DMA1_Stream5_IRQHandler(void){ portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; SEGGER_SYSVIEW_RecordEnterISR(); if(rxInProgress && (DMA1->HISR & DMA_HISR_TCIF5)) { rxInProgress = false; DMA1->HIFCR |= DMA_HIFCR_CTCIF5; xSemaphoreGiveFromISR(rxDone, &xHigherPriorityTaskWoken); } SEGGER_SYSVIEW_RecordExitISR(); portYIELD_FROM_ISR(xHigherPriorityTaskWoken); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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