AN3165

Integration principles and description

Doc ID 17180 Rev 1

21/31

Therefore, TIM5_TRGO has to be selected as the start trigger source for the injected

conversion of ADC3. TIM5_CC3 is mapped to TIM5_TRGO for internal purposes only.

In the integrated firmware, TIM5_CC3 therefore replaces the function of TIM8_CH4 in the

dual FOC MC part.

4.2.4

IRQ priorities

To set the IRQ priorities when the two parts are merged, it must be taken into account that

the execution time of the FOC routine lasts longer than that of the PFC routine. Therefore,

this last routine has to be able to interrupt the FOC routine.

As such, priority must be given to IRQs used for managing protection conditions or

synchronizations.

Table 5

shows the interrupts and their priorities for the integrated firmware, with 0 being the

highest priority.

4.3

Brief overview of firmware integration

In this application, the "STM32 dual FOC MC demonstration software" is intended as the

host firmware. The modules "pfc.c" and "pfc.h" of the "STM32 digital PFC" must be

integrated into the host firmware. Additionally, all the modifications described in the previous

sections must be added to the new code. To initialize the PFC, the following function has to

be added.

/* PFC Initialization */

PFC_INIT();

In particular, this function call has been added in the "main.c" file of the host firmware, and is

called after each initialization of the dual FOC MC.

Likewise, all modifications to the host firmware have been inserted inside control structures

characterized by the key word "PFC_ENABLE" defined in the module "pfc.h".

/* Global define ----*/

Table 5.

Used interrupts and their priorities for integrated firmware

Peripheral

IRQ use

Pre-emption

priority

Sub priority

EXTI/Line1

Overcurrent protection

0

0

TIM1 BRK

Emergency condition for main motor

0

0

TIM8 BRK

Emergency condition for sub motor

0

0

TIM1 UP

Synchronization for managing main motor

0

0

TIM8 UP

Synchronization for managing sub motor

0

0

DMA1_CH1

PFC routine

1

0

TIM4

Manages bus voltages for MC

2

0

ADC1/2

Optionally manages brake resistor

2

0

ADC3

FOC implementation for both main and sub motor

2

0

SYSTICK

Timer for delays

4

0