uart small ping pong receive, update of register functions

[cortex-from-scratch] / systick.c

diff --git a/systick.c b/systick.c
index 777d04d..48065ef 100644 (file)
--- a/systick.c
+++ b/systick.c
@@ -4,13 +4,34 @@
 #include <stm32.h>
 #include <mmap.h>
 
+struct interrupt_frame {
 
-void * systick_handler() {
+        uint32_t r0; // N-32
+        uint32_t r1;
+        uint32_t r2;
+        uint32_t r3;
+        uint32_t r12;
+        uint32_t lr;
+        uint32_t pc;
+        uint32_t psr; // N-4
+};
+
+
+/* void * systick_handler() {
 
 //     *RANDOM_ADDR = (volatile uint32_t) 0x10101010 ;
 //     uart_puts("TEST");
+} */
+
+__attribute__ ((interrupt))
+void * systick_handler(struct interrupt_frame * frame) {
+
+       uart_puts("TICKING\n");
+//     addrtohex((uint32_t) 0x12345678);
+       //      for(;;);
 }
 
+
 void systick_init() {
 
        /* Enable the counter and enable the interrupt