The MCP3008 can be employed to sample as many as 100kSps at 3.3V. For increased sampling premiums you'll find different SPI ADC remedies out there. Unfortunately, many are only accessible in surface area-mount deals.
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As the C calling convention locations purpose arguments at the best from the stack, the pt_regs composition includes the First sign-up values and also the interrupt price, which ended up previously saved over the stack during the assembly entry routine. do_IRQ() can extract the interrupt worth.
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The earlier portion addresses capabilities that disable all interrupt delivery for a whole processor. In some cases, it is useful to disable only a selected interrupt line for the entire procedure. This known as masking out
It streamlined loads of code while in the interrupt technique and. The end result is less complicated and simpler to understand.
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To disable interrupts regionally for The existing processor (only the current processor) after which you can later reenable them, do the following:
IRQF_SHARED. This flag specifies that the interrupt line might be shared between multiple interrupt handlers. Each and every handler registered on the given line will have to specify this flag; otherwise, only one handler can exist for each line.
If the required interrupt line is just not shared, this functionality gets rid of the handler and disables the road.
The return worth of an interrupt handler will be the special style irqreturn_t, which has two Particular values:
Any PRU input/output pins can be used for this undertaking – there is nothing exceptional about The actual PRU pins which can be picked out in this instance (i.e., there isn't any Exclusive SPI interaction functionality on these pins). The colors on the strains are saved consistent through this instance.
The third parameter, flags, may be possibly zero or a tad mask of one or more with the flags defined in . A very powerful of these flags are: