AN4035 datasheet(36/42 Pages) STMICROELECTRONICS

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Creating the Flash programming tool

AN4035

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Doc ID 022669 Rev 2

Creating the Flash programming tool

This section covers the Flash drivers provided by STMicroelectronic®, the tool

requirements, and also suggests a functional division of the tool.

6.1

Flash programming drivers

STMicroelectronics provides a set of Flash drivers called Standard Software Driver for

C90FL Flash (SSD). These drivers are easy to use and well documented. The drivers come

in a c-array format, s-record format, and library format. For external tools, the s-record

format is the easiest to use. Instructions on how to use the s-record format set of drivers is

discussed in the next section. There are also examples of using the three driver formats

provided with the installation of the SSD.

6.2

Tool requirements

The Flash programming tool must perform several required tasks to program the Flash on

the SPC56x devices.

6.2.1

Debug and driver initialization

The first requirement is to enter debug mode followed by the appropriate initialization.

These steps must be performed every time a reset occurs or a new SPC56x device is

connected to the Flash programming tool. The steps to do this are listed below.

Ensure that the JTAGC currently has control of the TAP by going through the PAUSE-

DR state. See Section 2.4.2: Test mode for details.

Enable the OnCE TAP controller by the method outlined in Section 3.1: Enabling the

OnCE TAP controller.

Enter debug mode during reset and enable recognition of software breakpoints as

mentioned in Section 3.5: Entering debug mode during reset.

Enable external debug mode and clear the debug status bits as mention in Section 3.6:

Enabling external debug mode and other initialization.

Setup the MMU as described in Section 5.2: Setting up the memory management unit.

If it is necessary depending on the device used.

Initialize the internal SRAM as mentioned in Section 5.1: Internal SRAM initialization.

The next step is to load the s-record format Flash driver set. The required drivers to load are

FlashInit, SetLock, FlashProgram, and FlashErase. The other drivers are not required but

could be loaded if features other than erasing and programming are desired. The s-record

drivers all specify the start address to be 0x0 however the drivers are position independent.

The tool should load each driver into internal SRAM at a desired location. The tool is

responsible for knowing where these drivers are located in memory. Space should also be

reserved in the internal SRAM for variables needed for the driver set. For example, the

SSD_CONFIG structure is used for all drivers.

Space must be allocated for this structure. Space should also be allocated in internal SRAM

for the stack and a buffer for the data to be programmed to Flash. The drivers and variables

can be written by the method described Section 3.12: OnCE memory access or the

methods described in Section 4: Nexus Read/Write access block.

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