I use the STM32G0 Timer2 to generate phase controlled signals. For negative phases the output needs to be toggled; After reset the state is always correct, but during runtime the OC polarity is not set correctly.
Here is my function. Can someone told me what is missing?
void tim2Phase(int16_t phase1, int16_t phase2, int16_t phase3)
{
TIM_OC_InitTypeDef sConfigOC = {0};
sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (phase1 >= 0)
{
phase1 = phase1*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
}
else
{
phase1 = 360 + phase1*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
}
sConfigOC.Pulse = phase1;
HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2);
if (phase2 >= 0)
{
phase2 = phase2*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
}
else
{
phase2 = 360 + phase2*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
}
sConfigOC.Pulse = phase2;
HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3);
if (phase3 >= 0)
{
phase3 = phase3*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
}
else
{
phase3 = 360 + phase3*2 + 1;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
}
sConfigOC.Pulse = phase3;
HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_4);
HAL_TIM_OC_Start(&htim2,TIM_CHANNEL_2);
HAL_TIM_OC_Start(&htim2,TIM_CHANNEL_3);
HAL_TIM_OC_Start(&htim2,TIM_CHANNEL_4);
}
Thanks,
Andrei B
