circuitpython/atmel-samd/main.c

#include <stdint.h>
#include <stdio.h>
#include <string.h>

#include "py/nlr.h"
#include "py/compile.h"
#include "py/mphal.h"
#include "py/runtime.h"
#include "py/repl.h"
#include "py/gc.h"

#include "lib/fatfs/ff.h"
#include "lib/utils/pyexec.h"
#include "extmod/fsusermount.h"

#include "asf/common/services/sleepmgr/sleepmgr.h"
#include "asf/common/services/usb/udc/udc.h"
#include "asf/common2/services/delay/delay.h"
#include "asf/sam0/drivers/port/port.h"
#include "asf/sam0/drivers/sercom/usart/usart.h"
#include "asf/sam0/drivers/system/system.h"

#include "mpconfigboard.h"
#include "modmachine_pin.h"
#include "storage.h"
#include "uart.h"

fs_user_mount_t fs_user_mount_flash;

void do_str(const char *src, mp_parse_input_kind_t input_kind) {
    mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
    if (lex == NULL) {
        printf("MemoryError: lexer could not allocate memory\n");
        return;
    }

    nlr_buf_t nlr;
    if (nlr_push(&nlr) == 0) {
        qstr source_name = lex->source_name;
        mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
        mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
        mp_call_function_0(module_fun);
        nlr_pop();
    } else {
        // uncaught exception
        mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
    }
}

static const char fresh_boot_py[] =
"# boot.py -- run on boot-up\r\n"
"# can run arbitrary Python, but best to keep it minimal\r\n"
"\r\n"
;

static const char fresh_main_py[] =
"# main.py -- put your code here!\r\n"
;

static const char fresh_readme_txt[] =
"This is a MicroPython board\r\n"
"\r\n"
"You can get started right away by writing your Python code in 'main.py'.\r\n"
"\r\n"
"For a serial prompt:\r\n"
" - Windows: you need to go to 'Device manager', right click on the unknown device,\r\n"
"   then update the driver software, using the 'pybcdc.inf' file found on this drive.\r\n"
"   Then use a terminal program like Hyperterminal or putty.\r\n"
" - Mac OS X: use the command: screen /dev/tty.usbmodem*\r\n"
" - Linux: use the command: screen /dev/ttyACM0\r\n"
"\r\n"
"Please visit http://micropython.org/help/ for further help.\r\n"
;

// we don't make this function static because it needs a lot of stack and we
// want it to be executed without using stack within main() function
void init_flash_fs() {
    // init the vfs object
    fs_user_mount_t *vfs = &fs_user_mount_flash;
    vfs->str = "/flash";
    vfs->len = 6;
    vfs->flags = 0;
    flash_init_vfs(vfs);

    // put the flash device in slot 0 (it will be unused at this point)
    MP_STATE_PORT(fs_user_mount)[0] = vfs;

    // try to mount the flash
    FRESULT res = f_mount(&vfs->fatfs, vfs->str, 1);

    if (res == FR_NO_FILESYSTEM) {
        // no filesystem, or asked to reset it, so create a fresh one

        res = f_mkfs("/flash", 0, 0);
        if (res == FR_OK) {
            // success creating fresh LFS
        } else {
            printf("PYB: can't create flash filesystem\n");
            MP_STATE_PORT(fs_user_mount)[0] = NULL;
            return;
        }

        // set label
        f_setlabel("/flash/internalflash");

        // create empty main.py
        FIL fp;
        f_open(&fp, "/flash/main.py", FA_WRITE | FA_CREATE_ALWAYS);
        UINT n;
        f_write(&fp, fresh_main_py, sizeof(fresh_main_py) - 1 /* don't count null terminator */, &n);
        f_close(&fp);

        // TODO(tannewt): Create an .inf driver file for Windows.

        // create readme file
        f_open(&fp, "/flash/README.txt", FA_WRITE | FA_CREATE_ALWAYS);
        f_write(&fp, fresh_readme_txt, sizeof(fresh_readme_txt) - 1 /* don't count null terminator */, &n);
        f_close(&fp);
    } else if (res == FR_OK) {
        // mount successful
    } else {
        printf("PYB: can't mount flash\n");
        MP_STATE_PORT(fs_user_mount)[0] = NULL;
        return;
    }

    // The current directory is used as the boot up directory.
    // It is set to the internal flash filesystem by default.
    f_chdrive("/flash");

    // Make sure we have a /flash/boot.py.  Create it if needed.
    FILINFO fno;
#if _USE_LFN
    fno.lfname = NULL;
    fno.lfsize = 0;
#endif
    res = f_stat("/flash/boot.py", &fno);
    if (res == FR_OK) {
        if (fno.fattrib & AM_DIR) {
            // exists as a directory
            // TODO handle this case
            // see http://elm-chan.org/fsw/ff/img/app2.c for a "rm -rf" implementation
        } else {
            // exists as a file, good!
        }
    } else {
        // doesn't exist, create fresh file

        FIL fp;
        f_open(&fp, "/flash/boot.py", FA_WRITE | FA_CREATE_ALWAYS);
        UINT n;
        f_write(&fp, fresh_boot_py, sizeof(fresh_boot_py) - 1 /* don't count null terminator */, &n);
        // TODO check we could write n bytes
        f_close(&fp);
    }
}

static char *stack_top;
static char heap[8192];

int main(int argc, char **argv) {
    // initialise the cpu and peripherals
    #if MICROPY_MIN_USE_SAMD21_MCU
    void samd21_init(void);
    samd21_init();
    #endif

    int stack_dummy;
    stack_top = (char*)&stack_dummy;

    #if MICROPY_ENABLE_GC
    gc_init(heap, heap + sizeof(heap));
    #endif
    mp_init();

    MP_STATE_PORT(mp_kbd_exception) = mp_obj_new_exception(&mp_type_KeyboardInterrupt);

    pin_init0();

    // Initialise the local flash filesystem.
    // Create it if needed, mount in on /flash, and set it as current dir.
    init_flash_fs();

    #if MICROPY_REPL_EVENT_DRIVEN
    pyexec_event_repl_init();
    for (;;) {
        int c = mp_hal_stdin_rx_chr();
        if (pyexec_event_repl_process_char(c)) {
            break;
        }
    }
    #else
    pyexec_friendly_repl();
    #endif
    //do_str("print('hello world!', list(x+1 for x in range(10)), end='eol\\n')", MP_PARSE_SINGLE_INPUT);
    //do_str("for i in range(10):\r\n  print(i)", MP_PARSE_FILE_INPUT);
    mp_deinit();
    return 0;
}

void gc_collect(void) {
    // WARNING: This gc_collect implementation doesn't try to get root
    // pointers from CPU registers, and thus may function incorrectly.
    void *dummy;
    gc_collect_start();
    gc_collect_root(&dummy, ((mp_uint_t)stack_top - (mp_uint_t)&dummy) / sizeof(mp_uint_t));
    gc_collect_end();
    gc_dump_info();
}

mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
    return NULL;
}

mp_import_stat_t mp_import_stat(const char *path) {
    return MP_IMPORT_STAT_NO_EXIST;
}

void mp_keyboard_interrupt(void) {
    MP_STATE_VM(mp_pending_exception) = MP_STATE_PORT(mp_kbd_exception);
}

void nlr_jump_fail(void *val) {
}

void NORETURN __fatal_error(const char *msg) {
    while (1);
}

#ifndef NDEBUG
void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
    printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
    __fatal_error("Assertion failed");
}
#endif

#if MICROPY_MIN_USE_SAMD21_MCU

struct usart_module usart_instance;

void samd21_init(void) {

  irq_initialize_vectors();
  cpu_irq_enable();

  // Initialize the sleep manager
  sleepmgr_init();

  system_init();

  delay_init();

  // Uncomment to init PIN_PA17 for debugging.
  // struct port_config pin_conf;
  // port_get_config_defaults(&pin_conf);
  //
  // pin_conf.direction  = PORT_PIN_DIR_OUTPUT;
  // port_pin_set_config(MICROPY_HW_LED1, &pin_conf);
  // port_pin_set_output_level(MICROPY_HW_LED1, false);

  #ifdef USB_REPL
    udc_start();
  #endif

  // TODO(tannewt): Switch to proper pyb based UARTs.
  #ifdef UART_REPL
    configure_usart();
  #endif
}

#endif