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/*
Skip table:
serial skip update -> update skip table
computer state table update -> reset skip lines of updated computers
Computer state table:
Host state change detection -> lookup skip table -> update computer state table
computer button toggle -> update computer state table
serial logical computer state toggle -> update computer state table
Outlet table:
outlet toggle button -> update table
computer state table update -> update table
serial toggle command -> update table
Outlet table update can start timer (doing eventually a relay switch on or off
action), switch on relay directly, switch off relay directly.
*/
/* sources of wakeup are:
* - every button press
* - computer state input change
* - uart rx
*/
#define OUTLET_BUTTONS_MASK 0x1F
#define COMPUTER_BUTTONS_MASK 0x60
#define OUTLET_BUTTONS_SHIFT 0
#define COMPUTER_BUTTONS_SHIFT 5
static struct tables_t {
volatile uint8_t buttons:7; // accessed by interrupt functions
uint8_t buttons_old:7;
volatile uint8_t computers:2; // accessed by interrupt functions
uint8_t computers_old:2;
uint8_t computer_state:2;
uint8_t computer_state_old:2;
} tables;
static struct uart_t {
volatile uint8_t rxfifo[8];
volatile uint8_t txfifo[8];
volatile uint8_t rxindex:4;
volatile uint8_t txindex:4;
} uart;
static void interrupt_pin_change(void)
{
update_button_table();
update_computer_input_table();
}
static void interrupt_uart_rx(void)
{
echo_back();
update_rx_fifo();
}
static void process_uart_rx(void)
{
switch (get_next_char()) {
case 'C':
break;
case 'T':
break;
case 'c':
break;
case 't':
break;
case 's':
break;
case 255:
break;
}
}
static void update_outlet_table(uint8_t changed)
{
}
static void update_computer_table(uint8_t changed)
{
}
static void main_loop(void)
{
uint8_t changed;
for (;;) {
// read tables.buttons only one time (8bits access, 8bits cpu, atomic)
changed = tables.buttons ^ tables.buttons_old;
tables.buttons_old ^= changed;
if (changed & COMPUTER_BUTTONS_MASK) {
update_computer_table(changed >> COMPUTER_BUTTONS_SHIFT);
}
changed = tables.computer_state ^ tables.computer_state_old;
tables.computer_state_old ^= changed;
if (changed & OUTLET_BUTTONS_MASK) {
update_outlet_table(changed >> OUTLET_BUTTONS_SHIFT);
}
changed = tables.computer_state ^ tables.computer_state_old;
tables.computer_state_old ^= changed;
// read computers state change
changed = tables.computers ^ tables.computers_old;
if (changed) {
}
process_uart_rx();
standby();
}
}
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