-#include "display.h"
+#include "display_basic.h"
#include "vend.h"
-#define DELAY_MAGIC 20 /* FIXME: number of loops for ~ 1 millisecond (< 256) */
void delay(u16 ms) {
+ /* delay routine written in assembly so we know what we're really getting.
+ * each inner loop should take ~1 ms to execute.
+ * 15 cycles * (1/4.9152Mhz) * 327 = 0.997 ms + a little bit on the fringes.
+ *
+ * XXX - how do we know gcc isn't optimising this? it seems to optimise after
+ * parsing C -> asm, but before asm -> machine code.
+ */
+ //asm volatile ("pshx\npsha\npshb\n"); /* save registers */
+ asm volatile ("ldx %0\n" :: "m" (ms) : "x");
+ asm volatile (
+ "delay_loop:\n"
+ //" 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 */
+ " subd #0x0001\n" /* 4 */
+ " bra delay_inner_loop\n" /* 3 */
+ "delay_inner_loop_end:\n"
+ " dex\n" /* 3 */
+ " beq delay_out\n" /* 3 */
+ " bra delay_loop\n" /* 3 */
+ "delay_out:\n" ::: "x", "d");
+ /*" pulb\n"
+ " pula\n"
+ " pulx\n");*/
+}
+
+u8 my_strlen(char* s) {
+ char *p = s;
+ while (*p) p++;
+ return p-s;
+}
+
+void my_strncpy(char* dst, char* src, u8 max_size) {
u8 i;
- for (;ms;ms--) {
- for (i=0;i<DELAY_MAGIC; i++)
- asm("nop\nnop\nnop\nnop\nnop\n");
- }
+ for (i = 0; src[i] && i < max_size; i++) dst[i] = src[i];
+ if (src[i] == 0 && i < max_size) dst[i] = 0; /* null terminator */
}
-void print_amount(u16 amt) {
- /* take amt and show it on screen with a $ sign */
- char str[10] = {' ', '$', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '};
- u8 pos;
- for (pos = 7; amt; pos--, amt/=10) {
- str[pos] = amt%10 + '0';
+bool my_strncmp(char* a, char* b, u8 len) {
+ u8 i;
+ for (i = 0; i < len; i++) {
+ if (*a != *b) return 0;
+ a++;
+ b++;
}
- set_msg(str, WRAP_NONE);
+ return 1;
+}
+
+void my_memcpy(char* dst, char* src, u8 size) {
+ u8 i = 0;
+ for (i = 0; i < size; i++) dst[i] = src[i];
+}
+
+void my_memset(char* dst, u8 val, u16 count) {
+ char* c;
+ for (c = dst; c < dst+count; c++) *c = val;
}