1 //==========================================================================
3 // devs/watchdog/h8300/h83000/watchdog_h8300.cxx
5 // Watchdog implementation for Hitachi H8/300H CPUs
7 //==========================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
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38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
43 // Author(s): yoshinori sato
44 // Contributors: yoshinori sato
46 // Purpose: Watchdog class implementation
47 // Description: Contains an implementation of the Watchdog class for use
48 // with the Hitachi H8/300H watchdog timer.
50 //####DESCRIPTIONEND####
52 //==========================================================================
54 #include <pkgconf/system.h> // system configuration file
55 #include <pkgconf/watchdog.h> // configuration for this package
57 #include <cyg/infra/cyg_trac.h> // tracing macros
59 #include <cyg/hal/hal_arch.h>
60 #include <cyg/hal/hal_io.h> // IO register access
61 #include <cyg/hal/mod_regs_wdt.h> // watchdog register definitions
63 #include <cyg/io/watchdog.hxx> // watchdog API
65 // -------------------------------------------------------------------------
69 Cyg_Watchdog::init_hw(void)
71 CYG_REPORT_FUNCTION();
73 // No hardware init needed.
75 resolution = CYGARC_WDT_PERIOD;
80 // -------------------------------------------------------------------------
81 // Start the watchdog running.
86 CYG_REPORT_FUNCTION();
89 HAL_WRITE_UINT16(CYGARC_TCSR,CYGARC_TCSR_MAGIC);
91 HAL_WRITE_UINT16(CYGARC_TCSR,CYGARC_TCNT_MAGIC);
93 HAL_WRITE_UINT16(CYGARC_TCSR,CYGARC_TCSR_MAGIC|
94 CYGARC_WDT_WT|CYGARC_WDT_TME|CYGARC_WDT_CKS);
98 // -------------------------------------------------------------------------
99 // Reset watchdog timer. This needs to be called regularly to prevent
100 // the watchdog firing.
103 Cyg_Watchdog::reset()
105 CYG_REPORT_FUNCTION();
107 HAL_WRITE_UINT16(CYGARC_TCSR,CYGARC_TCNT_MAGIC);
112 // -------------------------------------------------------------------------
113 // EOF watchdog_h8300.cxx