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#include <stdint.h>
// a pointer to this is a null pointer, but the compiler does not
// know that because "sram" is a linker symbol from sections.lds.
extern uint32_t sram;
#define reg_spictrl (*(volatile uint32_t*)0x02000000)
#define reg_uart_clkdiv (*(volatile uint32_t*)0x02000004)
#define reg_uart_data (*(volatile uint32_t*)0x02000008)
#define reg_leds (*(volatile uint32_t*)0x03000000)
void print(const char *p)
{
while (*p) {
if (*p == '\n')
reg_uart_data = '\r';
reg_uart_data = *(p++);
}
}
char getchar_prompt(char *prompt)
{
int32_t c = -1;
uint32_t cycles_begin, cycles_now, cycles;
__asm__ volatile ("rdcycle %0" : "=r"(cycles_begin));
if (prompt)
print(prompt);
reg_leds = ~0;
while (c == -1) {
__asm__ volatile ("rdcycle %0" : "=r"(cycles_now));
cycles = cycles_now - cycles_begin;
if (cycles > 12000000) {
if (prompt)
print(prompt);
cycles_begin = cycles_now;
reg_leds = ~reg_leds;
}
c = reg_uart_data;
}
reg_leds = 0;
return c;
}
char getchar()
{
return getchar_prompt(0);
}
// --------------------------------------------------------
extern uint32_t cmd_read_spi_flash_id_worker_begin;
extern uint32_t cmd_read_spi_flash_id_worker_end;
void cmd_read_spi_flash_id()
{
uint32_t *src_ptr = &cmd_read_spi_flash_id_worker_begin;
uint32_t *dst_ptr = &sram;
while (src_ptr != &cmd_read_spi_flash_id_worker_end)
*(dst_ptr++) = *(src_ptr++);
((void(*)())&sram)();
}
// --------------------------------------------------------
void main()
{
reg_uart_clkdiv = 104;
while (getchar_prompt("Press ENTER to continue..\n") != '\r') { /* wait */ }
print("\n");
print(" ____ _ ____ ____\n");
print(" | _ \\(_) ___ ___/ ___| ___ / ___|\n");
print(" | |_) | |/ __/ _ \\___ \\ / _ \\| |\n");
print(" | __/| | (_| (_) |__) | (_) | |___\n");
print(" |_| |_|\\___\\___/____/ \\___/ \\____|\n");
while (1)
{
print("\n");
print("\n");
print("Select an action:\n");
print("\n");
print(" [1] Read SPI Flash ID\n");
print("\n");
for (int rep = 10; rep > 0; rep--)
{
print("Command> ");
char cmd = getchar();
if (cmd > 32 && cmd < 127)
reg_uart_data = cmd;
print("\n");
switch (cmd)
{
case '1':
cmd_read_spi_flash_id();
rep = 0;
break;
}
}
}
}
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