UM1691 datasheet(35/41 Pages) STMICROELECTRONICS

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UM1691

General description

The FW L6470 library has been tested on the L6470H DISCOVERY board R1. The main

program contains a commented demonstration sequence which uses all the FW L6470

library supported features. This sequence is interactive and to proceed to the end some

user action is necessary.

For the “GoUntil” feature demonstration, when the LED SPARE is blinking for the first time,

the user shall close the SW MOTOR jumper J8. This triggers a switch turn on event at the

L6470 SW pin.

For the “ReleaseSW” feature demonstration, when the LED SPARE is blinking again, the

user shall open the SW MOTOR jumper J8. This triggers a L6470 SW pin release.

At the end of the demonstration sequence, the GPIO connected to LEFT and RIGHT

buttons are configured to trigger interrupts on the microcontroller:

On a LEFT button press, the microcontroller starts the motor at quarter of max. speed if it is

stopped or doubles the motor speed if it is already running.

On a LEFT button press, the microcontroller disables the power bridges after a smooth stop

if the motor is running at minimum speed or halves the motor speed if the motor is running

above minimum speed.

Even if the “Daisy Chain” mode is supported in the L6470 FW library, the L6470 Discovery

board HW does not allow it. Please contact ST support if you want more information on

“Daisy Chain” mode testing or implementation.

The FW L6470 library consists of the following files:



user_motion/dspin/inc/stm32f10x_conf.h Library configuration file



user_motion/dspin/src/stm32f10x_it.cInterrupt handlers



user_motion/dspin/inc/stm32f10x_it.hHeader for stm32f10x_it.c



user_motion/dspin/inc/clock.h

System clock setup related header



user_motion/dspin/src/clock.c

System clock source file



user_motion/dspin/inc/dspin.h

L6470 definitions header



user_motion/dspin/src/dspin.c

L6470 routines source file



user_motion/dspin/inc/dspin_config.hdSPIN configuration parameters (this file can be

generated by the GUI)



user_motion/dspin/inc/main.h

Main header file



user_motion/dspin/src/main.c

Main program



user_motion/dspin/inc/pre_include.hFirst header file included by the preprocessor



user_motion/dspin/readme.txt

Information on the files

4.6.3

Demonstration sequence description

The demonstration sequence description is for one L6470 device without daisy chaining.

The application commands used are noted after the pipe character. The application

commands traffic can be seen on the SPI interface, pins 18, 19, 20 and 23 which are

respectively SDO, CK, SDI and CS.

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