Download SH7268/SH7269 Group Video Display Controller 4 Driver User`s

SH7268/SH7269 Group
3.3
VDC4 Driver User’s Manual
Example of User-defined Function within VDC4_CheckClock
When using VDC4_CheckClock, the user-defined wait function is required. Two sample implementation are shown
below.
3.3.1
Compare Match Timer
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/******************************************************************//**
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* Function Name : Wait_Msec
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* @brief
Compare Match Timer (1ch) to Wait a msec
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* @n
Clock select
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* @n
Peripheral 0 clock 33.33MHz / 512
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* @param
[in]_UDWORD wait
: Wait time in msec
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* @retval
void
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*********************************************************************/
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void Wait_Msec( _UDWORD wait )
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{
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_UDWORD Compare ;
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_UWORD Reg ;
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_UDWORD PushReg ;
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volatile _UBYTE DummyRead ;
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PushReg = ( _UDWORD )CPG.STBCR7.BYTE & 0x0004ul ;
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/* Standby control register 7 (STBCR7)
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b3
-----0-- ; MSTP72 : 0 : Compare match timer enable */
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CPG.STBCR7.BYTE &= ( _UBYTE )( ~0x0004u ) ;
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/* Dummy read */
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DummyRead = CPG.STBCR7.BYTE ;
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/* Compare Match Timer Control/Status Register
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b7
---- ---- 0--- ---- CMF: Compare Match Flag; clearing
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b6
---- ---- -0-- ---- CMIE: Compare Match Interrupt Enable;
disabled
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b1:b0
---- ---- ---- --11 CKS: Clock Select, P0/512
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*/
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CMT.CMCSR1.WORD = ( _UWORD )0x0003u ;
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/* 1000usec / 15.36usec = 65.1 */
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Compare = wait * 66ul ;
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if( Compare >= 0x00010000ul )
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{
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Compare = 0x0000FFFFul ;
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}
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/* Compare Match Constant Register */
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CMT.CMCOR1.WORD = ( _UWORD )Compare ;
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/* Compare Match Counter */
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CMT.CMCNT1.WORD = 0 ;
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/* Compare Match Timer Start Register
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b1
---- ---- ---- --1- STR1: Count Start 1; started
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*/
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CMT.CMSTR.WORD |= ( _UWORD )0x0002u ;
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do
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{
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Reg = ( _UWORD )( CMT.CMCSR1.WORD & 0x0080u ) ;
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}
R01AN0778EJ0100 Rev.1.00
Apr 18, 2013
Page 85 of 105