?? bsp.c
字號:
* interrupt at the desired tick rate. You must decide which output compare you will be
* using by setting the configuration variable OS_TICK_OC (see OS_CFG.H and also OS_CPU_A.S)
* to 0..7 depending on which output compare to use.
* OS_TICK_OC set to 0 chooses output compare #0 as the ticker source
* OS_TICK_OC set to 1 chooses output compare #1 as the ticker source
* OS_TICK_OC set to 2 chooses output compare #2 as the ticker source
* OS_TICK_OC set to 3 chooses output compare #3 as the ticker source
* OS_TICK_OC set to 4 chooses output compare #4 as the ticker source
* OS_TICK_OC set to 5 chooses output compare #5 as the ticker source
* OS_TICK_OC set to 6 chooses output compare #6 as the ticker source
* OS_TICK_OC set to 7 chooses output compare #7 as the ticker source
*
* Arguments : None
*********************************************************************************************************
*/
static void OSTickISR_Init (void)
{
INT32U cpu_frq;
INT32U bus_frq;
INT8U ECT_Prescaler;
cpu_frq = BSP_CPU_ClkFreq(); /* Get the current CPU frequency */
bus_frq = cpu_frq / 2; /* Derive the BUS frequency from the CPU frequency */
ECT_Prescaler = TSCR2 & 0x07; /* Get the prescaler value in the control register */
ECT_Prescaler = (1 << ECT_Prescaler); /* Calculate the correct prescaler value from the reg val */
/* Calculate the nbr of ticks for the interrupt period */
OSTickCnts = (INT16U)((bus_frq / (ECT_Prescaler * OS_TICKS_PER_SEC)) - 1);
#if OS_TICK_OC == 0
TIOS |= 0x01; /* Make channel an output compare */
TC0 = TCNT + OSTickCnts; /* Set TC0 to present time + OS_TICK_OC_CNTS */
TIE |= 0x01; /* Enable OC4 interrupt. */
#endif
#if OS_TICK_OC == 1
TIOS |= 0x02; /* Make channel an output compare */
TC1 = TCNT + OSTickCnts; /* Set TC1 to present time + OS_TICK_OC_CNTS */
TIE |= 0x02; /* Enable OC4 interrupt. */
#endif
#if OS_TICK_OC == 2
TIOS |= 0x04; /* Make channel an output compare */
TC2 = TCNT + OSTickCnts; /* Set TC2 to present time + OS_TICK_OC_CNTS */
TIE |= 0x04; /* Enable OC4 interrupt. */
#endif
#if OS_TICK_OC == 3
TIOS |= 0x08; /* Make channel an output compare */
TC3 = TCNT + OSTickCnts; /* Set TC3 to present time + OS_TICK_OC_CNTS */
TIE |= 0x08; /* Enable OC4 interrupt. */
#endif
#if OS_TICK_OC == 4
TIOS |= 0x10; /* Make channel an output compare */
TC4 = TCNT + OSTickCnts; /* Set TC4 to present time + OS_TICK_OC_CNTS */
TIE |= 0x10; /* Enable OC4 interrupt. */
#endif
#if OS_TICK_OC == 5
TIOS |= 0x20; /* Make channel an output compare */
TC5 = TCNT + OSTickCnts; /* Set TC5 to present time + OS_TICK_OC_CNTS */
TIE |= 0x20; /* Enable OC5 interrupt. */
#endif
#if OS_TICK_OC == 6
TIOS |= 0x40; /* Make channel an output compare */
TC6 = TCNT + OSTickCnts; /* Set TC6 to present time + OS_TICK_OC_CNTS */
TIE |= 0x40; /* Enable OC6 interrupt. */
#endif
#if OS_TICK_OC == 7
TIOS |= 0x80; /* Make channel an output compare */
TC7 = TCNT + OSTickCnts; /* Set TC7 to present time + OS_TICK_OC_CNTS */
TIE |= 0x80; /* Enable OC7 interrupt. */
#endif
TSCR1 = 0xC0; /* Enable counter & disable counter in background mode */
}
/*
*********************************************************************************************************
* uC/OS-II TICK ISR HANDLER
*
* Description : This function is called by OSTickISR() (located in the OS_CPU_C.C)
* when a tick interrupt occurs.
*
* Arguments : none
*********************************************************************************************************
*/
void OSTickISR_Handler (void)
{
#if OS_TICK_OC == 0
TFLG1 |= 0x01; /* Clear interrupt */
TC0 += OSTickCnts; /* Set TC0 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 1
TFLG1 |= 0x02; /* Clear interrupt */
TC1 += OSTickCnts; /* Set TC1 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 2
TFLG1 |= 0x04; /* Clear interrupt */
TC2 += OSTickCnts; /* Set TC2 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 3
TFLG1 |= 0x08; /* Clear interrupt */
TC3 += OSTickCnts; /* Set TC3 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 4
TFLG1 |= 0x10; /* Clear interrupt */
TC4 += OSTickCnts; /* Set TC4 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 5
TFLG1 |= 0x20; /* Clear interrupt */
TC5 += OSTickCnts; /* Set TC5 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 6
TFLG1 |= 0x40; /* Clear interrupt */
TC6 += OSTickCnts; /* Set TC6 to present time + OS_TICK_OC_CNTS */
#endif
#if OS_TICK_OC == 7
TFLG1 |= 0x80; /* Clear interrupt */
TC7 += OSTickCnts; /* Set TC7 to present time + OS_TICK_OC_CNTS */
#endif
OSTimeTick(); /* Inform the OS about the Time Tick */
}
/*
*********************************************************************************************************
* Set the ECT Prescaler
*
* Description : This function configures the ECT prescaler during SYSTEM initialization.
*
* Callers : BSP_Init()
*
* Notes : This function should be called during system init, ideally fro BSP_Init().
* Changing the Prescaler during run-time could impact several modules. Be
* sure to use extreme caution when calling this function.
*********************************************************************************************************
*/
static void BSP_SetECT_Prescaler (INT8U prescaler)
{
TSCR2 &= ~TSCR2_PR_MASK; /* Clear all prescaler bits */
switch (prescaler) {
case 1:
TSCR2 &= ~TSCR2_PR_MASK; /* Set a prescaler of 1 */
break;
case 2:
TSCR2 |= 0x01; /* Set a prescaler of 2 */
break;
case 4:
TSCR2 |= 0x02; /* Set a prescaler of 4 */
break;
case 8:
TSCR2 |= 0x03; /* Set a prescaler of 8 */
break;
case 16:
TSCR2 |= 0x04; /* Set a prescaler of 16 */
break;
case 32:
TSCR2 |= 0x05; /* Set a prescaler of 32 */
break;
case 64:
TSCR2 |= 0x06; /* Set a prescaler of 64 */
break;
case 128:
TSCR2 |= 0x07; /* Set a prescaler of 128 */
break;
default:
TSCR2 |= 0x02; /* Set a prescaler of 4 if the passed value is invalid */
break;
}
}
/*
*********************************************************************************************************
* uC/LCD Display Hardware Initialization
*
* Description : DispInitPort() is responsible for initializing the hardware used to interface with the
* LCD module. DispInitPort() is called by DispInit().
*
* Arguments : None
*
* Callers : DispInit() from lcd.c
*
* Notes : 1) RW is permanently pulled LOW in hardware. Under normal circumstances, it too would
* have to be configured as an output pin.
*********************************************************************************************************
*/
#if (uC_LCD_MODULE > 0)
void DispInitPort (void)
{
DDRK |= LCD_BIT_RS | LCD_BIT_E | LCD_BIT_DATA0 | /* Setup RS, E and Data bit 0 lines as outputs */
LCD_BIT_DATA1 | LCD_BIT_DATA2 | LCD_BIT_DATA3; /* Setup the Data Lines 1, 2, 3 as outputs */
}
#endif
/*
*********************************************************************************************************
* uC/LCD Display Register Select
*
* Description : DispSel() determines whether data written to the HD44780 goes to the control or data
* register.
*
* Arguments : sel determines whether data written using DispDataWr() goes to the command register
* (when sel == DISP_SEL_CMD_REG) or the data register (when sel == DISP_SEL_DATA_REG).
*
* Callers : Various from lcd.c
*********************************************************************************************************
*/
#if (uC_LCD_MODULE > 0)
void DispSel (INT8U sel)
{
if (sel == DISP_SEL_CMD_REG) {
PORTK &= ~LCD_BIT_RS; /* Set the RS control line LOW */
} else {
PORTK |= LCD_BIT_RS; /* Set the RS control line HIGH */
}
}
#endif
/*
*********************************************************************************************************
* uC/LCD Display Data Write
*
* Description : DispDataWr() is used to write a single byte to the LCD module. Depending on the state
* of the RS line, the byte will be either sent to the data (RS is 1) or control register
* (RS is 0) of the LCD controller.
*
* Arguments : data is the byte value to write to the LCD controller module. The destination 慽nside?? 快捷鍵說明
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