Question

Problem 2: Portion of C code for setting up delays using SysTick Assume that SysTick Initialization has been performed correctly. Study the function below (it was used in Labl) and answer the questions that follow void SysTick_delay (void) NVIC ST RELOAD R-0x3E7F: I/ Load value for 1 ms delay NVIC ST CURRENT R = 0x0; // Clear current and start timer while((NVIC-ST-CTRL-R Ox000 10000) 0)(); // Wait until COUNT flag is & set The crystal Oscillator on the general purpose development board is 16 MHz. a) Show calculations that verify that loading RELOAD register (NVIC ST RELOAD R by Ox3E7F allows for the creation of a 1 ms delay. b) What logic operation(s) įs/are achieved by the line: NVIC-ST CTRL-R & 0x00010000) -0 used in the while loop.

Answer 1

ANSWER 3t is ivn thob the freuency of the csystau oscillator iS lGHR which IS lGHS9a This is eqat to 1G million clock cycles pe secomd 16000000 cycles/second 7 ① The preguency is i-e The NVTC-ST-RELoad-R= 0A3E7F the votue on the Right hand side is a hexode imat value os imdicated by the ox Ptefiz tuhen twe convest this heradecimat votue to a decmal value otmost equal to 16000 assumingt as cyctes JVeS equation(D t6eee cycles 000 cyctes |second 恰89 scconds 1000 : 1ms eiven opeTation s BaTWISE ND OPERATOR 2. The Given hexodecmol value ox00010000 cwhem conveated Binady is 0oo0 00oo 000o oo0o 3 The Valuc NVIC. ST_ CTRL.R (s sopPosed to be a opeyalos means that simito BinoTy omber and The

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