From 7ece451ef134395559c4f5c71c6d36197bb7c5c1 Mon Sep 17 00:00:00 2001
From: vg <vg@devys.org>
Date: Wed, 14 Feb 2018 17:32:46 +0100
Subject: write logic of power switch, wip

---
 two_hosts_auto_powerswitch/src/logic.c | 121 +++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 two_hosts_auto_powerswitch/src/logic.c

diff --git a/two_hosts_auto_powerswitch/src/logic.c b/two_hosts_auto_powerswitch/src/logic.c
new file mode 100644
index 0000000..04bf3ff
--- /dev/null
+++ b/two_hosts_auto_powerswitch/src/logic.c
@@ -0,0 +1,121 @@
+
+/*
+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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