Content originally posted in LPCWare by tjoAG on Fri Nov 23 00:22:00 MST 2012
Hi all
There must be something wrong with the Timer capture function in the CMSIS for the LPC17xx!!
See this function:
<code>
/*********************************************************************//**
* @brief Get Capture Interrupt Status
* @param[in]TIMx Timer selection, should be:
*- LPC_TIM0: TIMER0 peripheral
*- LPC_TIM1: TIMER1 peripheral
*- LPC_TIM2: TIMER2 peripheral
*- LPC_TIM3: TIMER3 peripheral
* @param[in]IntFlag: interrupt type, should be:
* - TIM_MR0_INT: Interrupt for Match channel 0
* - TIM_MR1_INT: Interrupt for Match channel 1
* - TIM_MR2_INT: Interrupt for Match channel 2
* - TIM_MR3_INT: Interrupt for Match channel 3
* - TIM_CR0_INT: Interrupt for Capture channel 0
* - TIM_CR1_INT: Interrupt for Capture channel 1
* @return FlagStatus
* - SET : interrupt
* - RESET : no interrupt
**********************************************************************/
FlagStatus TIM_GetIntCaptureStatus(LPC_TIM_TypeDef *TIMx, TIM_INT_TYPE IntFlag)
{
uint8_t temp;
temp = (TIMx->IR) & (1<<(4+IntFlag));
if(temp)
return SET;
return RESET;
}
</code>
The defines for the function
<code>
/***********************************************************************
* Timer device enumeration
**********************************************************************/
/** @brief interrupt type */
typedef enum
{
TIM_MR0_INT =0, /*!< interrupt for Match channel 0*/
TIM_MR1_INT =1, /*!< interrupt for Match channel 1*/
TIM_MR2_INT =2, /*!< interrupt for Match channel 2*/
TIM_MR3_INT =3, /*!< interrupt for Match channel 3*/
TIM_CR0_INT =4, /*!< interrupt for Capture channel 0*/
TIM_CR1_INT =5, /*!< interrupt for Capture channel 1*/
}TIM_INT_TYPE;
</code>
So getting the capture status for the TIM_CR0_INT would resolve in masking the IR register with:
0x100 (1 << (4 + 4))
Should have been 0x10 (bit 4)!!!
Thomas
