LAB 6 JTAG and Multi-ICE 第四組 R 蘇倉弘 R 莊銘罡 R 陳建志

OUTLINE Introduction to the Multi-ICE components EmbeddedICE Watchpoints and Breakpoints Connecting Multi-ICE to AXD Lotto Program

Introduction to the Multi-ICE components

EmbeddedICE A debug monitor, such as Angel, is an application that runs on the board in conjunction with the user application, and requires some resource to beavailable for it on the board. This means that Angel requires ROM to store the debug monitor code, RAM to store its data, and control over the exception vectors to allow it to gain control of the ARM while the user application is running.

EmbeddedICE The EmbeddedICE debug architecture, on the other hand, requires no such resource. the debuggee needs no special hardware to support debugging (the EmbeddedICE macrocell and the JTAG TAP controller are all that is required) no memory in the debuggee system need be set aside for debugging, and no special software need be incorporated to allow debugging.

Note : Although the EmbeddedICE debug architecture requires no memory on the target to operate, the target will still require some memory for executing its own application code. EmbeddedICE

Watchpoints and Breakpoints Watchpoints All ARM debugger watchpoints are data-changed watchpoints, that is, they are not activated if the data point is read or written to with the same data value as the one currently in memory. Hardware versus software watchpoints Hardware watchpoints are implemented using an EmbeddedICE macrocellpoint to spot data writes to addresses that fall inside a mask. This type of watchpoint is efficient because execution stops only when the relevant data is written. Software watchpoints make no use of the EmbeddedICE macrocell. Instead, after each instruction is executed, the data locations concerned are examined to see whether their values have changed. This type of watchpoint drastically reduces execution performance.

Watchpoints are taken when the data being watchpointed has changed. When this happens, the program counter is updated to point to the instruction following the one that caused the watchpoint to be taken. The value of the watchpointed data is therefore the new value, not the old value. Watchpoints and Breakpoints Breakpoints are taken when the instruction being breakpointed reaches the execution stage of the pipeline, but before it is executed. So, when the breakpoint is taken, the program counter is not updated, and retains the address of the breakpointed instruction. Note : Inside the core of an ARM, the program counter typically points to two instructions beyond the currently executing instruction However, the ARM debuggers simplify this by reporting a modified value for the program counter, so that when it is displayed within the debugger, its contents are the address of the instruction being

Watchpoints and Breakpoints

1.Starting the Multi-ICE server (1)Ensure that: The Multi-ICE interface unit is plugged into the workstation The Multi-ICE interface unit is plugged into the target JTAG connector The target is powered up The green power light on the interface unit is glowing brightly (2)Select Start -> Program -> ARM Multi-ICE v2.2 -> Multi-ICE Server. (3)File -> Auto-configure 2.Perform a variety of debugging tasks Experiment Steps Connecting Multi-ICE to AXD

Before using Multi-ICE, we must connect Multi- ICE to AXD first. Connecting Multi-ICE to AXD AXD->OPTIONS->CONFIGURE TARGET

1.Select Options->Configure Target (from the AXD Options menu) 2.If Multi-ICE is not listed in the Target Environment, we must add it in the Target Environment 3. Configure the Multi-ICE.dll How to setup Multi-ICE configuration Connecting Multi-ICE to AXD

ARMulator Multi-ICE Connecting Multi-ICE to AXD

Error Message Solution Ignore this message and configure target again Connecting Multi-ICE to AXD

Number of the set: N. The numbers must be included in these N sets of number Numbers chosen by user Numbers chosen by computer Lotto Program

Input parameters Number sets chosen by ourselves Number sets chosen by computer Result Lotto Program

Multi-ICE(DUI0048E_MICE2_1_UG.PDF) Embedded ICE (ARM DAI 0031C) Embedded Trace Macrocell (ARM DDI 015BD) Reference