PIT.h File Reference

Periodic Interrupt Timer driver for MPC5604P. More...

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Defines
#define	TRUE   (1u)
#define	CLEAR   (0u)
#define	BITS_IN_NIBBLE   (4u)
#define	BITS_IN_BYTE   (8u)
#define	BYTES_IN_16   (2u)
#define	BYTES_IN_32   (4u)
#define	BIT_DEFINITION
#define	BIT0   (1u << 0u)
#define	BIT1   (1u << 1u)
#define	BIT2   (1u << 2u)
#define	BIT3   (1u << 3u)
#define	BIT4   (1u << 4u)
#define	BIT5   (1u << 5u)
#define	BIT6   (1u << 6u)
#define	BIT7   (1u << 7u)
#define	BIT8   (1u << 8u)
#define	BIT9   (1u << 9u)
#define	BIT10   (1u << 10)
#define	BIT11   (1u << 11)
#define	BIT12   (1u << 12)
#define	BIT13   (1u << 13)
#define	BIT14   (1u << 14)
#define	BIT15   (1u << 15)
#define	BIT16   (1u << 16)
#define	BIT17   (1u << 17)
#define	BIT18   (1u << 18)
#define	BIT19   (1u << 19)
#define	BIT20   (1u << 20)
#define	BIT21   (1u << 21)
#define	BIT22   (1u << 22)
#define	BIT23   (1u << 23)
#define	BIT24   (1u << 24)
#define	BIT25   (1u << 25)
#define	BIT26   (1u << 26)
#define	BIT27   (1u << 27)
#define	BIT28   (1u << 28)
#define	BIT29   (1u << 29)
#define	BIT30   (1u << 30)
#define	BIT31   (1u << 31)
#define	N_PIT_CHANNELS   (4u)
#define	PIT_INVALID_CH   ((uint8_t)BIT0)
#define	PIT_ERROR_TIMED_OUT   ((uint8_t)BIT1)
#define	N_ELEMENTS(X)   (sizeof(X)/sizeof(*(X)))
#define	PIT_CLEAR_FLAG(XX)   PIT.CH[XX].TFLG.R = TRUE
Functions
uint8_t	u8fnPITConfig (const uint8_t u8Channel, const uint32_t u32InitialCount, const uint8_t u8UseISR)
	Configures a particular PIT channel for immediate operation.
void	vfnPITStart (const uint8_t u8Channel, const uint8_t u8Enable)
	Starts or stops the timer for a particular PIT channel.
uint8_t	u8fnPITWaitByPoll (const uint8_t u8Channel, const uint8_t u8Restart)
	Waits for a PIT channel to expire in RUN mode.

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Detailed Description

Periodic Interrupt Timer driver for MPC5604P.

Copyright (c) 2011 Freescale Semiconductor Freescale Confidential Proprietary

Author:

Freescale Semiconductor

SASD Automotive

R11515

Version:

Date:

Warning:

(If needed)

History:

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Define Documentation

#define PIT_ERROR_TIMED_OUT   ((uint8_t)BIT1)

PIT never computed the expected time error mask

#define PIT_INVALID_CH   ((uint8_t)BIT0)

Channel is not valid error mask

---

Function Documentation

uint8_t u8fnPITConfig	(	const uint8_t	u8Channel,
		const uint32_t	u32InitialCount,
		const uint8_t	u8UseISR
	)

Configures a particular PIT channel for immediate operation.

Parameters:

u8Channel,:	PIT channel number (0 - 3 for Pictus)
u32InitialCount,:	Number of cycles to count before flagging
u8UseISR,:	Switch to allow for interrupts or not

Returns:

CLEAR if all went ok; PIT_INVALID_CH if the passed channel doesn't exist in HW

uint8_t u8fnPITWaitByPoll	(	const uint8_t	u8Channel,
		const uint8_t	u8Restart
	)

Waits for a PIT channel to expire in RUN mode.

Parameters:

u8Channel,:	PIT channel number (0 - 3 for Pictus)
u8Restart,:	If non-zero, the PIT timer will be restart immediately

Returns:

Zero when PIT counted down correctly, PIT_ERROR_TIMED_OUT otherwise.

void vfnPITStart	(	const uint8_t	u8Channel,
		const uint8_t	u8Enable
	)

Starts or stops the timer for a particular PIT channel.

Parameters:

u8Channel,:	PIT channel number (0 - 3 for Pictus)
u8Enable,:	If non-zero, the timer will start, if zero it will stop

Returns:

Void.