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naughty_mark
Joined: 29 Aug 2012
Posts: 97
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| question about input capture source clock |
 Posted: Tue Sep 25, 2012 12:59 am |
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Hi, there
I get a problem when I using input capture.
I am using dsPIC33EP256MU814 and my ccs version is 4.133.
The head of my program is
| Code: |
#if defined(__PCD__)
#include <33EP256MU814.h>
#fuses HS,PR,NOWDT,ICSP2,NOGSSK,NOPROTECT,NOAPROTECT,NOAPLK,PR_PLL
#device ADC=12
#use delay(clock=120M, xtal=20M) // Actual crystal is 20M
#pin_select U1TX = PIN_D0
#pin_select U1RX = PIN_D1
#pin_select U2TX = PIN_D2
#pin_select U2RX = PIN_D3
#use RS232(UART1, STREAM = GSM, BAUD=9600, XMIT = PIN_D0 , RCV = PIN_D1 , BITS = 8, STOP = 1, PARITY = N, ERRORS)
#use RS232(UART2, STREAM = MODBUS, BAUD=9600, XMIT = PIN_D2 , RCV = PIN_D3 , BITS = 8, STOP = 1, PARITY = N, ERRORS)
#use i2c(MASTER, I2C1,SCL = PIN_D10, SDA = PIN_D9 , FORCE_SW)
#pin_select IC1=PIN_F0
#pin_select C1TX = PIN_D6
#pin_select C1RX = PIN_D5
#endif
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And I init my IC1 in they way following, I don't use ccs built-in function because it doesn't work.
| Code: |
void iniIC1(void)
{
SETUP_TIMER2(TMR_INTERNAL,TMR_DIV_BY_64); //enable Timer 2
/*ini IC interrupt config*/
IC1CON1 = 0x0403;
IC1CON2 = 0x0000;
IFS0 = 0x0000;
IEC0 |= 0x0002;
IPC0 |= 0x0010;
}
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The problem is even if I declare DIV_BY_64 for timer2, the frequency which driver the IC timer is system clock (120M/2 = 60M).
The setup_timer2 built-in function works, because I used the same built-in function for other timers and works well. I can not get where is the cause.
I tried many ways including "cascade ic" to get a 32bit timer, but failed. Anyone can give some suggestion ?
Thanks a lot |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Tue Sep 25, 2012 4:20 am |
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| Code: |
SETUP_TIMER2(TMR_INTERNAL|TMR_DIV_BY_64); //enable Timer 2
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SETUP_TIMERx, does not accept multiple arguments. It expects the constants to be or'ed together.
Quote from the .h file:
"
// Constants used for SETUP_TIMERx() are:
// (or (via |) together constants from each group)"
Best Wishes |
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naughty_mark
Joined: 29 Aug 2012
Posts: 97
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| Posted: Tue Sep 25, 2012 4:18 pm |
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| Ttelmah wrote: | | Code: |
SETUP_TIMER2(TMR_INTERNAL|TMR_DIV_BY_64); //enable Timer 2
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SETUP_TIMERx, does not accept multiple arguments. It expects the constants to be or'ed together.
Quote from the .h file:
"
// Constants used for SETUP_TIMERx() are:
// (or (via |) together constants from each group)"
Best Wishes |
Hi Ttelmah, I would like to say thank you very much, and how stupid I am  I used other timer in a correct way but this.  |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Wed Sep 26, 2012 1:23 am |
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It is made harder, with things like the PWM function, supporting an overloaded version with two variables, _or_ the values or'ed together, while others require only the later. Easy to forget/miss. 
Best Wishes |
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