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nn-usb-fpga/lm32/logic/sakc/firmware/boot0-serial/main.c
2010-05-25 21:49:58 -05:00

58 lines
1021 B
C

/**
* Primitive first stage bootloader
*
*
*/
#include "soc-hw.h"
/* prototypes */
uint32_t read_uint32()
{
uint32_t val = 0, i;
for (i = 0; i < 4; i++) {
val <<= 8;
val += (uint8_t)uart_getchar();
}
return val;
}
int main(int argc, char **argv)
{
int8_t *p;
uint8_t c;
// Initialize UART
uart_init();
c = '*'; // print msg on first iteration
for(;;) {
uint32_t start, size;
switch (c) {
case 'u': // upload
start = read_uint32();
size = read_uint32();
for (p = (int8_t *) start; p < (int8_t *) (start+size); p++)
*p = uart_getchar();
break;
case 'd': // download
start = read_uint32();
size = read_uint32();
for (p = (int8_t *) start; p < (int8_t *) (start+size); p++)
uart_putchar( *p );
break;
case 'g': // goto
start = read_uint32();
jump(start);
break;
default:
uart_putstr("**SAKC/bootloader** > \r\n");
break;
};
c = uart_getchar();
}
}