Add a bunch. Neglected doing commits.HEADmain

Add many different patterns, and organize it.

Add a voltage discovery subsystem to allow the ch573 to detect if it's
on 12v or 5v lights.

1 files changed, 27 insertions, 20 deletions

diff --git a/src/exc.c b/src/exc.c
index 657ddb8..9b7242b 100644
--- a/src/exc.c
+++ b/src/exc.c
@@ -1,43 +1,50 @@
 #include <stdio.h>
 
+#include "ch573/gpio.h"
 #include "isr_vector.h"
 #include "panic.h"
-
-#include "ch573/gpio.h"
+#include "risc-v.h"
 
 #define GPIO_PORT_A ch573_gpio__gpio_port_a
 #define GPIO_PORT CH573_GPIO__GPIO_PORT_T_INTF
 
 void delay();
 
-IRQ(exc)
+struct exc_info {
+  uint32_t mtval;
+  uint32_t mepc;
+  uint32_t mcause;
+};
+
+static inline void get_exc_info(struct exc_info* out)
 {
-  uint32_t mcause, mepc, mtval, *sp;
+  out->mtval = MTVAL;
+  out->mepc = MEPC;
+  out->mcause = MCAUSE;
+}
 
-  asm volatile("csrr %0, mcause" : "=r"(mcause));
-  asm volatile("csrr %0, mepc" : "=r"(mepc));
-  asm volatile("csrr %0, mtval" : "=r"(mtval));
+IRQ(exc)
+{
+  struct exc_info ei;
+  get_exc_info(&ei);
 
   printf("Hardware Exception Caught:\n");
-  printf("  mcause: 0x%08x\n", mcause);
-  printf("    mepc: 0x%08x\n", mepc);
-  printf("   mtval: 0x%08x\n", mtval);
+  printf("  mcause: 0x%08x\n", ei.mcause);
+  printf("    mepc: 0x%08x\n", ei.mepc);
+  printf("   mtval: 0x%08x\n", ei.mtval);
 
-  panic(mcause);
+  panic(ei.mcause);
 }
 
 IRQ(nmi)
 {
-  uint32_t mcause, mepc, mtval, *sp;
-
-  asm volatile("csrr %0, mcause" : "=r"(mcause));
-  asm volatile("csrr %0, mepc" : "=r"(mepc));
-  asm volatile("csrr %0, mtval" : "=r"(mtval));
+  struct exc_info ei;
+  get_exc_info(&ei);
 
   printf("Unhandled NMI Caught:\n");
-  printf("  mcause: 0x%08x\n", mcause);
-  printf("    mepc: 0x%08x\n", mepc);
-  printf("   mtval: 0x%08x\n", mtval);
+  printf("  mcause: 0x%08x\n", ei.mcause);
+  printf("    mepc: 0x%08x\n", ei.mepc);
+  printf("   mtval: 0x%08x\n", ei.mtval);
 
-  panic(mcause);
+  panic(ei.mcause);
 }