Altera Nios II C2H Compiler Bedienungsanleitung PDF herunterladen (Seite 99)

Altera Corporation 9.1 4–5

November 2009 Nios II C2H Compiler User Guide

Understanding the C2H View

Example 4–1. Vector Power Calculation

#pragma altera_accelerate connect_variable power_calculation/voltage to onchipRAM1

#pragma altera_accelerate connect_variable power_calculation/current to onchipRAM1

#pragma altera_accelerate connect_variable power_calculation/power to onchipRAM2

void power_calculation ( short * __restrict__ voltage,

short * __restrict__ current,

short * __restrict__ power,

short downscale,

int length)

{

int i;

for(i = 0; i < length; i++)

{

*power++ = (*voltage++ * *current++) >> downscale;

}

Example 4–1 requires Avalon-MM read and write master ports to

perform memory accesses. It also requires a multiplier and a barrel shifter

to perform the right shift operation. The pragma statements inform the

C2H Compiler that the input data is stored in a memory called

onchipRAM1 and the output data is to be stored in onchipRAM2. When

the C2H Compiler compiles this function, the Nios II IDE generates a

build report as shown in Figure 4–1.

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 137 138

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Altera Nios II C2H Compiler Bedienungsanleitung Seite 99