Lots of changes! Takes us to rom S

[uccvend-snackrom.git] / ROM2 / helpers.c

diff --git a/ROM2/helpers.c b/ROM2/helpers.c
index 5f0da09..ad52123 100644 (file)
--- a/ROM2/helpers.c
+++ b/ROM2/helpers.c
@@ -10,12 +10,13 @@ void delay(u16 ms) {
         * parsing C -> asm, but before asm -> machine code.
         */
        //asm volatile ("pshx\npsha\npshb\n"); /* save registers */
-       asm volatile ("ldx %0\n" :: "m" (ms));
+       asm volatile ("ldx %0\n" :: "m" (ms) : "x");
        asm volatile (
                "delay_loop:\n"
                "       dex\n"                        /* 3 */
                "       beq delay_out\n"              /* 3 */
-               "       ldd #327\n"                   /* 3 */
+               //"     ldd #327\n"                   /* 3 */
+               "       ldd #150\n"                   /* 3 */
                "delay_inner_loop:\n" /* 15 cycles each */
                "       cpd #0x0000\n"                /* 5 */
                "       beq delay_inner_loop_end\n"   /* 3 */
@@ -23,7 +24,7 @@ void delay(u16 ms) {
                "       bra delay_inner_loop\n"       /* 3 */
                "delay_inner_loop_end:\n"
                "       bra delay_loop\n"             /* 3 */
-               "delay_out:\n");
+               "delay_out:\n" ::: "x", "d");
                /*"     pulb\n"
                "       pula\n"
                "       pulx\n");*/
@@ -35,6 +36,16 @@ void my_strncpy(char* dst, char* src, u8 max_size) {
        if (src[i] == 0 && i < max_size) dst[i] = 0; /* null terminator */
 }
 
+bool my_strncmp(char* a, char* b, u8 len) {
+       u8 i;
+       for (i = 0; i < len; i++) {
+               if (*a != *b) return 0;
+               a++;
+               b++;
+       }
+       return 1;
+}
+
 void my_memcpy(char* dst, char* src, u8 size) {
        u8 i = 0;
        for (i = 0; i < size; i++) dst[i] = src[i];