Posted on May 17, 2011 at 09:36In the str library, the 91x_tim.c file has a bug.
if the TIM_InitTypeDef structure is used and the timer is initialized like:
/* TIM1 Configuration in PWM Mode */
TIM_InitStructure.TIM_Mode = TIM_PWM;
TIM_InitStructure.TIM_Clock_Source = TIM_CLK_APB;
TIM_InitStructure.TIM_Prescaler = 0xFF;
TIM_InitStructure.TIM_Pulse_Level_1 = TIM_HIGH;
TIM_InitStructure.TIM_Period_Level = TIM_LOW;
TIM_InitStructure.TIM_Pulse_Length_1 = 0x0001;
TIM_InitStructure.TIM_Full_Period = 0x0001;
TIM_Init (TIM1, &TIM_InitStructure);
This does not work as the TIM_Init() function assigns:
/* Set the Duty Cycle value */
if ( TIM_InitStruct->TIM_Pulse_Length_1 < 5 )
{
TIM_InitStruct->TIM_Pulse_Length_1 = 4;
}
but leaves TIM_Full_Period as it is. hence, for any TIM_Pulse_Length_1 < 5
timer does not work
Work around:
comment the section which does the assignment
