print to uart0 [note: always printed on screen through DMA]

[cortex-from-scratch] / main.c

diff --git a/main.c b/main.c
index 57a199e..87b45e7 100644 (file)
--- a/main.c
+++ b/main.c
@@ -1,7 +1,63 @@
-void main(void);
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stm32.h> // <-- your own header file located located in ./include
 
-void main(void ) {
 
-       int i = 1;
-       for (;;);
+void *memcpy(void *dest, void *src, size_t count)
+{   
+    const char *sp = (const char *)src;
+    char *dp = (char *)dest;
+    for(; count != 0; count--) *dp++ = *sp++;
+    return dest;
+}
+
+/* fillout memory with 'val' (i.e. all zeroes)
+ */
+void *memset(void *dest, unsigned char val, size_t count)
+{
+    char *temp = (char *)dest;
+    for( ; count != 0; count--) *temp++ = val;
+    return dest;
+}
+
+/* same as above but shorter */
+unsigned short *memsetw(unsigned short *dest, unsigned short val, size_t count)
+{
+    unsigned short *temp = (unsigned short *)dest;
+    for( ; count != 0; count--) *temp++ = val;
+    return dest;
+}
+
+int strlen(const char *str)
+{
+    int retval;
+    for(retval = 0; *str != '\0'; str++) retval++;
+    return retval;
+}
+
+unsigned char inportb (uint32_t _addr) 
+{
+    unsigned char rv;
+    //__asm__ __volatile__ ("inb %1, %0" : "=a" (rv) : "dN" (_port));
+    return rv;
+
+}
+
+void outportb (uint32_t _addr, unsigned char _data)
+{
+
+  // __asm__ __volatile__ ("str %1, %0"  : "=r" (_data)  : "m" (_addr) );
+
+   // __asm__ __volatile__ ("outb %1, %0" : : "dN" (_port), "a" (_data));
+}
+
+void main()
+{
+       uart_init();
+       uart_puts("LOADING SYSTEM...\n");
+       // loop
+       for(;;) {
+
+       }
 }