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Lab 10: Programming the Flash

TMS320F2837xD Microcontroller Workshop - System Design 10 - 17

Adc.c

F2837xD_GlobalVariableDefs.c

Cla_10.c

F2837xD_Headers_nonBIOS_cpu1.cmd

ClaTasks.asm

Flash.c

ClaTasks_C.cla

Gpio.c

CodeStartBranch.asm

Lab_10.cmd

Dac.c

Main_10.c

DefaultIsr_9_10.c

PieCtrl.c

DelayUs.asm

PieVect.c

Dma.c

SineTable.c

ECap.c

SysCtrl.c

EPwm.c

Watchdog.c

F2837xD_Adc.c

Xbar.c

Note: The Flash.c file will be added during the lab exercise.

Link Initialized Sections to Flash

Initialized sections, such as code and constants, must contain valid values at device power-up.

Stand-alone operation of an embedded system means that no debug probe (emulator) is

available to initialize the device RAM. Therefore, all initialized sections must be linked to the on-

chip flash memory.

Each initialized section actually has two addresses associated with it. First, it has a LOAD

address which is the address to which it gets loaded at load time (or at flash programming time).

Second, it has a RUN address which is the address from which the section is accessed at

runtime. The linker assigns both addresses to the section. Most initialized sections can have the

same LOAD and RUN address in the flash. However, some initialized sections need to be loaded

to flash, but then run from RAM. This is required, for example, if the contents of the section

needs to be modified at runtime by the code.

2. Open and inspect the linker command file Lab_10.cmd. Notice that the first flash sector

has been divided into two blocks named BEGIN_FLASH and FLASH_A. The FLASH_A

flash sector origin and length has been modified to avoid conflicts with the other flash

sector spaces. The remaining flash sectors have been combined into a single block

named FLASH_BCDEFGHIJKLMN. See the reference slide at the end of this lab

exercise for further details showing the address origins and lengths of the various flash

sectors used.

3. Edit Lab_10.cmd to link the following compiler sections to on-chip flash memory block

FLASH_BCDEFGHIJKLMN:

Compiler Sections:

.text .cinit .const .econst .pinit .switch

Copying Interrupt Vectors from Flash to RAM

The interrupt vectors must be located in on-chip flash memory and at power-up needs to be

copied to the PIE RAM as part of the device initialization procedure. The code that performs this

copy is located in InitPieCtrl(). The C-compiler runtime support library contains a memory copy

function called memcpy() which will be used to perform the copy.

4. Open and inspect InitPieCtrl() in PieCtrl.c. Notice the memcpy() function used to

initialize (copy) the PIE vectors. At the end of the file a structure is used to enable the

PIE.

Brand	Texas Instruments
Model	TMS320F2837 D Series
Category	Microcontrollers
Language	English

Texas Instruments TMS320F2837 D Series Workshop Guide And Lab Manual

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