Heart Beat Blinker

Macros
#define	HB_DIV   (9u)
#define	HB_DUTYCYCLE   (32u)
#define	HB_SKIP   (3u)
#define	FAST_BLINK   (9u)
#define	SLOW_BLINK   (FAST_BLINK + 2u)

Functions
void	blinker (void)

Variables
bool	sys_ok = true
bool	configuring = false
uint8_t	hbdCount = 0
uint8_t	hbsCount = 0

Detailed Description

This section contains the heart beat blinker.

The main driver of the heart beat LED display is a counter and some combinational logic performed on select bits on the counter. The counter selected is the previously implemented t1Count which increments every 1ms or so. A slow bit of the counter a bit two times faster are selected. These two bits are then "and"ed together to form the main heartbeat.

This program implements two complications on the original heart beat functionality. One is a heart beat skip implemented as the counter hbsCount. This counter is triggered on ::hbs_re or "heart beat skip, rising edge" which is triggered on some combinational logic on the same t1Count as the main heartbeat. Specifically, it is triggered when the slow counter bit is high and the subsequent lesser-significant bits are zero. In bit-vector terms, this would look something like 0bzzzz zz10 0000 0000 where 'z' is a "don't care" bit. The heart beat skip counter is set to 0 the cycle after it reaches its compare match value HB_SKIP. The original heart beat ::hb_intrenal can reach additional code when the hbsCount is zero.

The other complication upon the original heart beat is a duty cycle limiter. Instead of implementing a compare value, this duty cycle counter is clocked on the execution of this block of code. It contains a state machine with two states: ack and nack. Upon the heart beat reaching this block of code, it is treated as a strobe. In the nack state, a high value on the strobe causes the state machine to transition into the ack state, set the counter to one, and light the LED. In the ack state, the counter up-counts on each execution until it reaches its top value. On the cycle after reaching the top value, the LED is unlit. When the heart beat signal (strobe) is no longer given, the state machine returns to its initial value, nack.

Macro Definition Documentation

FAST_BLINK

#define FAST_BLINK   (9u)

Definition at line 105 of file IoT Supervisor_main.c.

HB_DIV

#define HB_DIV   (9u)

Definition at line 100 of file IoT Supervisor_main.c.

HB_DUTYCYCLE

#define HB_DUTYCYCLE   (32u)

Definition at line 103 of file IoT Supervisor_main.c.

HB_SKIP

#define HB_SKIP   (3u)

Definition at line 104 of file IoT Supervisor_main.c.

SLOW_BLINK

#define SLOW_BLINK   (FAST_BLINK + 2u)

Definition at line 106 of file IoT Supervisor_main.c.

Function Documentation

blinker()

void blinker

(

void

)

Definition at line 113 of file IoT Supervisor_main.c.

Variable Documentation

configuring

bool configuring = false

Definition at line 109 of file IoT Supervisor_main.c.

hbdCount

uint8_t hbdCount = 0

Definition at line 110 of file IoT Supervisor_main.c.

hbsCount

uint8_t hbsCount = 0

Definition at line 111 of file IoT Supervisor_main.c.

sys_ok

bool sys_ok = true

Definition at line 108 of file IoT Supervisor_main.c.