plf_misc.c File Reference

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Detailed Description

HAL miscellaneous functions.

Author:

Uwe Kindler, yoshinori sato

Date:

2003-12-06

This file contains miscellaneous functions provided by the

Definition in file plf_misc.c.

Go to the source code of this file.

Functions
externC void	__default_interrupt_vsr (void)
	Default interrupt vector service routine.
void	hal_platform_init (void)
	Additional platform initialisation.
void	hal_clock_initialize (cyg_uint32 period)
	Timer (TPU channel 5) initialisation.
void	hal_clock_read (cyg_uint32 *pvalue)
	Reads current value of timer counter.
void	cyg_plf_memory_segment (int seg, unsigned char **start, unsigned char **end)
	Provide information about additional memory segment.
Variables
externC volatile CYG_ADDRESS	hal_vsr_table [CYGNUM_HAL_VSR_COUNT]
	Contains vector service routines for all interrupt vectors (vectors.S).

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Function Documentation

externC void __default_interrupt_vsr (  void   )

Default interrupt vector service routine.

void cyg_plf_memory_segment (  int  seg, unsigned char **  start, unsigned char **  end )

Provide information about additional memory segment. We provide information about the internal H8S/2674 ram. Parameters: start  Start address of memory segment end  End address of memory segment seg  Number of segment provided by redboot Note: The first memory segment 0 is calculated by RedBoot Definition at line 205 of file plf_misc.c. { cyg_uint32 mem_start; // // we have one additional memory segment - the H8S/2674 internal ram // if (seg == 1) { // // the internal ram contains VSR table, virtual vector table and // shadow vector table. these areas are reserved and not available // so we end at start of CYGHWR_HAL_VSR_TABLE an not at ffc000 // mem_start = 0xff4000; *start = (unsigned char *)(mem_start); *end = (unsigned char *)(CYGHWR_HAL_VSR_TABLE); } else { diag_printf("** Invalid memory segment #%d - ignored\n", seg); *start = NO_MEMORY; *end = NO_MEMORY; } }

void hal_clock_initialize (  cyg_uint32  period  )

Timer (TPU channel 5) initialisation. Initializes the timer device to interrupt at the given period. The period is essentially the value used to initialize the timer counter and must be calculated from the timer frequency and the desired interrupt rate. Parameters: period  The timer device should generate an interrupt every period cycles. Note: We initialize counter here but we do not enable interrupts. This will be done by kernel later. NUMERATOR = 1.000.000.000 DENOMINATOR = 100 period = CPU Clock / Prescaler * NUMERATOR / DENOMINATOR / 1.000.000.000 Definition at line 139 of file plf_misc.c. { cyg_uint8 tmp; // // start 16 bit timer module in MSTPCRH register // HAL_READ_UINT8(CYGARC_MSTPCRH, tmp); tmp &= ~CYGARC_MSTPCRH_TPU; HAL_WRITE_UINT8(CYGARC_MSTPCRH, tmp); // // initialize 16 bit timer - first we select timer counter clock and // counter clearing source TGR // Clock prescaler is 16 (clock/16) and TCNT is clear at compare match A // HAL_WRITE_UINT8(CYGARC_TCR5, CYGARC_TCR_CLR_CMA | CYGARC_TCR_TPSC_16); // // Select output compare register - Designate the TGRA as an output compare // register by means of TIOR. // HAL_WRITE_UINT8(CYGARC_TIOR5, 0x00); // output compare - output disabled HAL_WRITE_UINT16(CYGARC_TGRA5, period); // set compare match value to period HAL_WRITE_UINT16(CYGARC_TCNT5, 0x00); // reset up counter // // Now start the counter 5 - intterrupts will be enabled from HAL later // HAL_WRITE_UINT8(CYGARC_TSTR, CYGARC_TSTR_CST5); }

void hal_clock_read (  cyg_uint32 *  pvalue  )

Reads current value of timer counter. Reads the current value of the timer counter and puts the value in the location pointed to by pvalue. The value stored will always be the number of timer cycles since the last interrupt, and hence ranges between zero and the initial period value. If this is a count-down cyclic timer, some arithmetic may be necessary to generate this value. Parameters: pvalue  Points to place where value should be stored Definition at line 183 of file plf_misc.c. { cyg_uint16 val; HAL_READ_UINT16(CYGARC_TCNT5, val); *pvalue = val; }

void hal_platform_init (  void   )

Additional platform initialisation. These will perform any additional initialization needed by platform. This typically includes further initialization of the interrupt controller, PCI bus bridges, basic IO devices and enabling the caches. Note: : At the moment there are nothing to do here for the EDOSK platform except for calling hal_if_init() because we youse virtual vector support. Definition at line 112 of file plf_misc.c. { // // intialize virtual vector calling interface // hal_if_init(); }

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Variable Documentation

externC volatile CYG_ADDRESS hal_vsr_table[CYGNUM_HAL_VSR_COUNT]

Contains vector service routines for all interrupt vectors (vectors.S). Definition at line 93 of file plf_misc.c.

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