arm: async echo app

2022-05-16 20:56:25 -07:00
parent 30d9a2d7c8
commit 932b8d4582
25 changed files with 3043 additions and 29 deletions
--- a/arm/timer.h
+++ b/arm/timer.h
@@ -0,0 +1,63 @@
+#pragma once
+
+struct TimerControl {
+    union {
+        struct {
+            uint32_t MDT0  : 1;
+            uint32_t UDT0  : 1;
+            uint32_t GENT0 : 1;
+            uint32_t CAPT0 : 1;
+            uint32_t ARHT0 : 1;
+            uint32_t LOAD0 : 1;
+            uint32_t ENIT0 : 1;
+            uint32_t ENT0  : 1;
+            uint32_t T0INT : 1;
+            uint32_t PWMA0 : 1;
+            uint32_t ENALL : 1;
+            uint32_t CASC  : 1;
+
+            uint32_t reserved : 20;
+        };
+        uint32_t raw;
+    };
+};
+
+struct Timer {
+    volatile TimerControl TCSR0;
+    volatile uint32_t TLR0;
+    volatile uint32_t TCR0;
+
+    uint32_t _reserved;
+
+    volatile TimerControl TCSR1;
+    volatile uint32_t TLR1;
+    volatile uint32_t TCR1;
+
+    void EnableT1() {
+        TCSR1.ARHT0 = 1;
+        TCSR1.ENT0 = 1;
+    }
+
+    uint32_t GetT1Ticks() {
+        return TCR1;
+    }
+
+    void SetupAsWdt(uint32_t timeout_ticks) {
+        TLR0 = timeout_ticks;
+        TCSR0.LOAD0 = 1; // reset counter
+        TCSR0.UDT0 = 1;  // count backwards from the load value
+        TCSR0.ENIT0 = 1; // enable interrupt
+
+        TCSR0.LOAD0 = 0; // allow counter to run
+        TCSR0.ENT0 = 1;  // enable timer
+    }
+
+    void Pet() {
+        TCSR0.ENT0 = 0;
+        TCSR0.LOAD0 = 1;
+        TCSR0.LOAD0 = 0;
+        TCSR0.ENT0 = 1;
+    }
+};
+
+#define timer0 ((Timer*) 0x40002000)