circuitpython/atmel-samd/main.c

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

#include "py/nlr.h"
#include "py/compile.h"
#include "py/runtime.h"
#include "py/repl.h"
#include "py/gc.h"
#include "lib/utils/pyexec.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/system/system.h"

#include "mpconfigboard.h"
#include "sam_ba_usb.h"

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 char *stack_top;
static char heap[2048];

int main(int argc, char **argv) {
    int stack_dummy;
    stack_top = (char*)&stack_dummy;

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

mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
    return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);

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_CORTEX_CPU

// this is a minimal IRQ and reset framework for any Cortex-M CPU

extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;

void Reset_Handler(void) __attribute__((naked));
void Reset_Handler(void) {
    // stack pointer set by bootloader
    // copy .data section from flash to RAM
    for (uint32_t *src = &_sidata, *dest = &_sdata; dest < &_edata;) {
        *dest++ = *src++;
    }
    // zero out .bss section
    for (uint32_t *dest = &_sbss; dest < &_ebss;) {
        *dest++ = 0;
    }
    // jump to board initialisation
    void _start(void);
    _start();
}

void Default_Handler(void) {
    for (;;) {
    }
}

uint32_t isr_vector[] __attribute__((section(".isr_vector"))) = {
    (uint32_t)&_estack,
    (uint32_t)&Reset_Handler,
    (uint32_t)&Default_Handler, // NMI_Handler
    (uint32_t)&Default_Handler, // HardFault_Handler
    (uint32_t)&Default_Handler, // MemManage_Handler
    (uint32_t)&Default_Handler, // BusFault_Handler
    (uint32_t)&Default_Handler, // UsageFault_Handler
    0,
    0,
    0,
    0,
    (uint32_t)&Default_Handler, // SVC_Handler
    (uint32_t)&Default_Handler, // DebugMon_Handler
    0,
    (uint32_t)&Default_Handler, // PendSV_Handler
    (uint32_t)&Default_Handler, // SysTick_Handler
};

void _start(void) {
    // when we get here: stack is initialised, bss is clear, data is copied

    // initialise the cpu and peripherals
    #if MICROPY_MIN_USE_SAMD21_MCU
    void samd21_init(void);
    samd21_init();
    #endif

    // now that we have a basic system up and running we can call main
    main(0, NULL);

    // we must not return
    for (;;) {
    }
}

#endif

#if MICROPY_MIN_USE_SAMD21_MCU

void samd21_init(void) {

  irq_initialize_vectors();
  cpu_irq_enable();

  // Initialize the sleep manager
  sleepmgr_init();

  system_init();

  delay_init();

  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);

  // Start USB stack to authorize VBus monitoring

  udc_start();
  for (int i = 0; i < 10; i++) {
    port_pin_toggle_output_level(MICROPY_HW_LED1);
    delay_ms(500);
  }

}

#endif