Configurações
Entrega rápida
Incoterms
Tipos de pagamentos
Produto do Mercado
Slide 1
Slide 2
Slide 3
Slide 4
Slide 5
Slide 6
Slide 7
Slide 8
Slide 9
Slide 10
Slide 11
Slide 12
Slide 13
Slide 14
Slide 15
Slide 16
Slide 17
Slide 18
Slide 19
Slide 20
Slide 21
Slide 22
Slide 23
Slide 24
Slide 25
Slide 26
Slide 27
Slide 28
Slide 29
Slide 30
Slide 31
Slide 32
Slide 33
Slide 34
Slide 35
Slide 36
Product List
For the kernel application, the serial peripheral interface (SPI) will be used. There are a number of core routines set up to control the device, allow users to get and set data to registers on the device. The SPI driver also uses DMA transfers to copy DMA into and out of the device. The user code will then use ioctl commands to tell the SPI device what activity it wants to perform. It will request to go to or from the device with a read or a write. When a read call is performed the device driver will set up a DMA transfer, enabling the data transfer and waiting for an interrupt. The read will terminate once the interrupt is received. The data is then available for copying into user space. The user code continues with the new data.
PTM Published on: 2006-01-20
Brasil