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sandropiovesana
Joined: 06 May 2008
Posts: 9
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| Problem with shutdown on PIC16f684 |
 Posted: Wed Jun 04, 2008 8:42 am |
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Hi All,
I have a problem when i shutdown (in firmware) the bridge because i don't have the shutdown condition indicated in my software but i have all low level on P1A,P1B,P1C,P1D. (i want high level).
I use CCS 4.073, MPLAB 8.10 and ICD2 (only for programming).
How can i have high level on P1A,P1B,P1C,P1D (using ECCP)?
How can i have high level on P1A,P1B,P1C,P1D (using another idea)?
This is my code:
| Code: |
#include <16F684.h>
#DEVICE ADC=10
#BIT ECCPASE = 0x17.7
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES NOCPD //No EE protection
#FUSES NOWDT //No Watch Dog Timer
#FUSES PUT //Power Up Timer
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOFCMEN //NO Fail-safe clock monitor enabled
#USE delay(clock=8000000)
#USE FAST_IO(A)
#USE FAST_IO(C)
#define CCP1_LOW_SPD 70 // 70% Duty-Cycle
#define CCP1_HIGH_SPD 100 // 100% Duty-Cycle
// PORT CONTROL
#define TRISA_SETUP 0b11111110
#define TRISC_SETUP 0b11000011 // Prima con RS232 era 0b11011100
#define BJT 40 // PIN_RA0
#define VREF 41 // PIN_RA1
#define VAMP 42 // PIN_RA2
#define VPP 43 // PIN_RA3
#define JMP2 44 // PIN_RA4
#define JMP1 45 // PIN_RA5
#define VCC_2 56 // PIN_RC0
#define POL 57 // PIN_RC1
#define P1D 58 // PIN_RC2
#define P1C 59 // PIN_RC3
#define P1B 60 // PIN_RC4
#define P1A 61 // PIN_RC5
/* Global definitions used to indicate the state of a pin */
#define LOW 0
#define HIGH 1
//----------------------------------------------------------------------------
//- - MAIN - -
//----------------------------------------------------------------------------
void main(void)
{
setup_oscillator(OSC_8MHZ);
Set_Tris_A(TRISA_SETUP);
Set_Tris_C(TRISC_SETUP);
setup_adc_ports(sAN2|sAN4|VSS_VREF);
setup_adc(ADC_CLOCK_INTERNAL);
SETUP_TIMER_2 (T2_DIV_BY_4, 100, 1);
set_pwm1_duty (CCP1_LOW_SPD);
ENABLE_INTERRUPTS(GLOBAL);
while (TRUE)
{
SETUP_CCP1 (CCP_PWM_L_H | CCP_PWM_FULL_BRIDGE | CCP_SHUTDOWN_AC_H | CCP_SHUTDOWN_BD_H);
delay_ms(1000);
ECCPASE = 1;
delay_ms(1000);
ECCPASE = 0;
}
} |
Datasheet:
11.4.4 ENHANCED PWM
AUTO-SHUTDOWN MODE
The PWM mode supports an Auto-Shutdown mode that
will disable the PWM outputs when an external
shutdown event occurs. Auto-Shutdown mode places
the PWM output pins into a predetermined state. This
mode is used to help prevent the PWM from damaging
the application.
The auto-shutdown sources are selected using the
ECCPASx bits of the ECCPAS register. A shutdown
event may be generated by:
• A logic ‘0’ on the INT pin
• Comparator 1
• Comparator 2
• Setting the ECCPASE bit in firmware |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jun 05, 2008 12:15 pm |
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The setup_ccp1() function is not writing to the ECCPAS register.
That's a bug. To fix it, add this line above main():
| Code: | | #byte ECCPAS = 0x017 |
Then add this line just after the setup_ccp1() line in your program.
This will manually setup the ECCPAS register.
| Code: |
ECCPAS = make8(CCP_SHUTDOWN_BD_H | CCP_SHUTDOWN_AC_H, 2); |
I have reported this to CCS. |
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sandropiovesana
Joined: 06 May 2008
Posts: 9
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| Posted: Fri Jun 06, 2008 12:57 am |
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Thank You very much!!!
Sandro |
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