263 lines
7.3 KiB
C
263 lines
7.3 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "py/compile.h"
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#include "py/runtime.h"
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#include "py/repl.h"
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#include "py/gc.h"
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#include "py/mperrno.h"
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#include "lib/utils/pyexec.h"
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#if MICROPY_ENABLE_COMPILER
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void do_str(const char *src, mp_parse_input_kind_t input_kind) {
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
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qstr source_name = lex->source_name;
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mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
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mp_obj_t module_fun = mp_compile(&parse_tree, source_name, true);
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mp_call_function_0(module_fun);
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nlr_pop();
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} else {
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// uncaught exception
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mp_obj_print_exception(&mp_plat_print, (mp_obj_t)nlr.ret_val);
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}
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}
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#endif
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static char *stack_top;
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#if MICROPY_ENABLE_GC
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static char heap[2048];
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#endif
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int main(int argc, char **argv) {
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int stack_dummy;
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stack_top = (char *)&stack_dummy;
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#if MICROPY_ENABLE_GC
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gc_init(heap, heap + sizeof(heap));
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#endif
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mp_init();
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#if MICROPY_ENABLE_COMPILER
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#if MICROPY_REPL_EVENT_DRIVEN
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pyexec_event_repl_init();
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for (;;) {
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int c = mp_hal_stdin_rx_chr();
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if (pyexec_event_repl_process_char(c)) {
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break;
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}
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}
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#else
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pyexec_friendly_repl();
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#endif
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//do_str("print('hello world!', list(x+1 for x in range(10)), end='eol\\n')", MP_PARSE_SINGLE_INPUT);
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//do_str("for i in range(10):\r\n print(i)", MP_PARSE_FILE_INPUT);
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#else
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pyexec_frozen_module("frozentest.py");
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#endif
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mp_deinit();
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return 0;
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}
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void gc_collect(void) {
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// WARNING: This gc_collect implementation doesn't try to get root
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// pointers from CPU registers, and thus may function incorrectly.
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void *dummy;
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gc_collect_start();
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gc_collect_root(&dummy, ((mp_uint_t)stack_top - (mp_uint_t)&dummy) / sizeof(mp_uint_t));
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gc_collect_end();
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gc_dump_info();
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}
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mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
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mp_raise_OSError(MP_ENOENT);
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}
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mp_import_stat_t mp_import_stat(const char *path) {
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return MP_IMPORT_STAT_NO_EXIST;
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}
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mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
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void nlr_jump_fail(void *val) {
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while (1) {
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;
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}
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}
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void NORETURN __fatal_error(const char *msg) {
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while (1) {
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;
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}
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}
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#ifndef NDEBUG
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void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
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printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
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__fatal_error("Assertion failed");
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}
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#endif
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#if MICROPY_MIN_USE_CORTEX_CPU
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// this is a minimal IRQ and reset framework for any Cortex-M CPU
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extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;
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void Reset_Handler(void) __attribute__((naked));
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void Reset_Handler(void) {
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// set stack pointer
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__asm volatile ("ldr sp, =_estack");
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// copy .data section from flash to RAM
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for (uint32_t *src = &_sidata, *dest = &_sdata; dest < &_edata;) {
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*dest++ = *src++;
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}
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// zero out .bss section
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for (uint32_t *dest = &_sbss; dest < &_ebss;) {
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*dest++ = 0;
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}
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// jump to board initialisation
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void _start(void);
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_start();
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}
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void Default_Handler(void) {
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for (;;) {
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}
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}
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const uint32_t isr_vector[] __attribute__((section(".isr_vector"))) = {
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(uint32_t)&_estack,
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(uint32_t)&Reset_Handler,
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(uint32_t)&Default_Handler, // NMI_Handler
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(uint32_t)&Default_Handler, // HardFault_Handler
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(uint32_t)&Default_Handler, // MemManage_Handler
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(uint32_t)&Default_Handler, // BusFault_Handler
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(uint32_t)&Default_Handler, // UsageFault_Handler
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0,
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0,
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0,
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0,
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(uint32_t)&Default_Handler, // SVC_Handler
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(uint32_t)&Default_Handler, // DebugMon_Handler
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0,
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(uint32_t)&Default_Handler, // PendSV_Handler
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(uint32_t)&Default_Handler, // SysTick_Handler
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};
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void _start(void) {
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// when we get here: stack is initialised, bss is clear, data is copied
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// SCB->CCR: enable 8-byte stack alignment for IRQ handlers, in accord with EABI
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*((volatile uint32_t *)0xe000ed14) |= 1 << 9;
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// initialise the cpu and peripherals
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#if MICROPY_MIN_USE_STM32_MCU
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void stm32_init(void);
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stm32_init();
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#endif
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// now that we have a basic system up and running we can call main
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main(0, NULL);
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// we must not return
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for (;;) {
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}
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}
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#endif
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#if MICROPY_MIN_USE_STM32_MCU
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// this is minimal set-up code for an STM32 MCU
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typedef struct {
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volatile uint32_t CR;
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volatile uint32_t PLLCFGR;
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volatile uint32_t CFGR;
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volatile uint32_t CIR;
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uint32_t _1[8];
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volatile uint32_t AHB1ENR;
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volatile uint32_t AHB2ENR;
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volatile uint32_t AHB3ENR;
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uint32_t _2;
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volatile uint32_t APB1ENR;
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volatile uint32_t APB2ENR;
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} periph_rcc_t;
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typedef struct {
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volatile uint32_t MODER;
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volatile uint32_t OTYPER;
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volatile uint32_t OSPEEDR;
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volatile uint32_t PUPDR;
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volatile uint32_t IDR;
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volatile uint32_t ODR;
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volatile uint16_t BSRRL;
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volatile uint16_t BSRRH;
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volatile uint32_t LCKR;
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volatile uint32_t AFR[2];
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} periph_gpio_t;
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typedef struct {
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volatile uint32_t SR;
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volatile uint32_t DR;
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volatile uint32_t BRR;
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volatile uint32_t CR1;
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} periph_uart_t;
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#define USART1 ((periph_uart_t *) 0x40011000)
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#define GPIOA ((periph_gpio_t *) 0x40020000)
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#define GPIOB ((periph_gpio_t *) 0x40020400)
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#define RCC ((periph_rcc_t *) 0x40023800)
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// simple GPIO interface
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#define GPIO_MODE_IN (0)
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#define GPIO_MODE_OUT (1)
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#define GPIO_MODE_ALT (2)
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#define GPIO_PULL_NONE (0)
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#define GPIO_PULL_UP (0)
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#define GPIO_PULL_DOWN (1)
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void gpio_init(periph_gpio_t *gpio, int pin, int mode, int pull, int alt) {
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gpio->MODER = (gpio->MODER & ~(3 << (2 * pin))) | (mode << (2 * pin));
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// OTYPER is left as default push-pull
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// OSPEEDR is left as default low speed
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gpio->PUPDR = (gpio->PUPDR & ~(3 << (2 * pin))) | (pull << (2 * pin));
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gpio->AFR[pin >> 3] = (gpio->AFR[pin >> 3] & ~(15 << (4 * (pin & 7)))) | (alt << (4 * (pin & 7)));
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}
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#define gpio_get(gpio, pin) ((gpio->IDR >> (pin)) & 1)
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#define gpio_set(gpio, pin, value) do { gpio->ODR = (gpio->ODR & ~(1 << (pin))) | (value << pin); } while (0)
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#define gpio_low(gpio, pin) do { gpio->BSRRH = (1 << (pin)); } while (0)
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#define gpio_high(gpio, pin) do { gpio->BSRRL = (1 << (pin)); } while (0)
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void stm32_init(void) {
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// basic MCU config
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RCC->CR |= (uint32_t)0x00000001; // set HSION
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RCC->CFGR = 0x00000000; // reset all
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RCC->CR &= (uint32_t)0xfef6ffff; // reset HSEON, CSSON, PLLON
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RCC->PLLCFGR = 0x24003010; // reset PLLCFGR
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RCC->CR &= (uint32_t)0xfffbffff; // reset HSEBYP
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RCC->CIR = 0x00000000; // disable IRQs
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// leave the clock as-is (internal 16MHz)
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// enable GPIO clocks
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RCC->AHB1ENR |= 0x00000003; // GPIOAEN, GPIOBEN
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// turn on an LED! (on pyboard it's the red one)
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gpio_init(GPIOA, 13, GPIO_MODE_OUT, GPIO_PULL_NONE, 0);
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gpio_high(GPIOA, 13);
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// enable UART1 at 9600 baud (TX=B6, RX=B7)
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gpio_init(GPIOB, 6, GPIO_MODE_ALT, GPIO_PULL_NONE, 7);
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gpio_init(GPIOB, 7, GPIO_MODE_ALT, GPIO_PULL_NONE, 7);
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RCC->APB2ENR |= 0x00000010; // USART1EN
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USART1->BRR = (104 << 4) | 3; // 16MHz/(16*104.1875) = 9598 baud
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USART1->CR1 = 0x0000200c; // USART enable, tx enable, rx enable
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}
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#endif
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