Freescale Semiconductor M68HC08 manual System Constants and Variables

Definitions of Constants and Variables

...represents the integral gain of the PI PFC stage regulator in run mode.

44.	#define	PI_SCALE	0
	...represents the scaling factor of the PI PFC stage regulator (2^scale).
45.	#define PI_MIN_VAL		0
	...represents the minimum value of the PI PFC stage regulator output.
46.	#define PI_MAX_VAL		255
	...represents the maximum value of the PI PFC stage regulator output.
47.	#define PI_KP_RUNI		2
	...represents the proportional gain of the PI ballast stage regulator in run mode.
48.	#define PI_KI_RUNI		1
	...represents the integral gain of the PI ballast stage regulator in run mode.
49.	#define	PI_SCALEI	0
	...represents the scaling factor of the PI ballast stage regulator (2^scale).

5.6.2 System Constants and Variables

This section describes the external global variables and constants used in the program.

1.extern tSW_FLAGS SW_FLAGS;

This variable represents auxiliary program control flags and is defined as: typedef union uSW_FLAGS

{tU08byte;

struct
{
tU08 pi_en		1;// - bit enables or disables PI PFC stage regulator calculation
tU08 trim_comp_en			:1;// - bit enables or disables trimmable value of internal
oscillator calculation
tU08 f_1_ms:			1;// - bit represents if 1 ms time interval has gone
tU08 pi_eni		:1;// - bit enables or disables PI ballast stage regulator calculation
tU08:	4;// - the others five bits are not used
}bit;
}tSW_FLAGS;

2.extern tU08 pwm_sin_tab_pointer;

This variable acts as a pointer to a value in table bSinTab[].

3.	extern tU08	m_avg_Dim[8];
	This buffer saves the last eight AD conversion values of the required dimming value, for moving
	average calculations.
4.	extern tU08	p_m_avg_Dim;
	This variable acts as a pointer to a value in the m_avg_Dim[8] array.
5.	extern tU16	m_avg_sum_Dim;
	This variable represents the sum of all values in the m_avg_Dim[8] array.
6.	extern tU08	act_Uc;
	This variable represents the actual value of the DC-bus voltage.
7.	extern tU08	time1ms;
	This variable counts PWM interrupts. The variable is incremented at every PWM interrupt. It is used
		Dimmable Light Ballast with Power Factor Correction, Rev. 1
Freescale Semiconductor		55