diff options
Diffstat (limited to 'esp8266/modonewire.c')
| -rw-r--r-- | esp8266/modonewire.c | 70 |
1 files changed, 62 insertions, 8 deletions
diff --git a/esp8266/modonewire.c b/esp8266/modonewire.c index a8b40baaa5..9831ae552a 100644 --- a/esp8266/modonewire.c +++ b/esp8266/modonewire.c @@ -3,7 +3,7 @@ * * The MIT License (MIT) * - * Copyright (c) 2015 Damien P. George + * Copyright (c) 2015-2017 Damien P. George * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal @@ -29,8 +29,62 @@ #include "py/obj.h" #include "py/mphal.h" -#include "modmachine.h" -#include "esponewire.h" + +/******************************************************************************/ +// Low-level 1-Wire routines + +#define TIMING_RESET1 (0) +#define TIMING_RESET2 (1) +#define TIMING_RESET3 (2) +#define TIMING_READ1 (3) +#define TIMING_READ2 (4) +#define TIMING_READ3 (5) +#define TIMING_WRITE1 (6) +#define TIMING_WRITE2 (7) +#define TIMING_WRITE3 (8) + +STATIC uint16_t esp_onewire_timings[9] = {480, 40, 420, 5, 5, 40, 10, 50, 10}; + +STATIC int onewire_bus_reset(mp_hal_pin_obj_t pin) { + mp_hal_pin_write(pin, 0); + mp_hal_delay_us(esp_onewire_timings[TIMING_RESET1]); + uint32_t i = mp_hal_quiet_timing_enter(); + mp_hal_pin_write(pin, 1); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_RESET2]); + int status = !mp_hal_pin_read(pin); + mp_hal_quiet_timing_exit(i); + mp_hal_delay_us(esp_onewire_timings[TIMING_RESET3]); + return status; +} + +STATIC int onewire_bus_readbit(mp_hal_pin_obj_t pin) { + mp_hal_pin_write(pin, 1); + uint32_t i = mp_hal_quiet_timing_enter(); + mp_hal_pin_write(pin, 0); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_READ1]); + mp_hal_pin_write(pin, 1); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_READ2]); + int value = mp_hal_pin_read(pin); + mp_hal_quiet_timing_exit(i); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_READ3]); + return value; +} + +STATIC void onewire_bus_writebit(mp_hal_pin_obj_t pin, int value) { + uint32_t i = mp_hal_quiet_timing_enter(); + mp_hal_pin_write(pin, 0); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_WRITE1]); + if (value) { + mp_hal_pin_write(pin, 1); + } + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_WRITE2]); + mp_hal_pin_write(pin, 1); + mp_hal_delay_us_fast(esp_onewire_timings[TIMING_WRITE3]); + mp_hal_quiet_timing_exit(i); +} + +/******************************************************************************/ +// MicroPython bindings STATIC mp_obj_t onewire_timings(mp_obj_t timings_in) { mp_obj_t *items; @@ -43,12 +97,12 @@ STATIC mp_obj_t onewire_timings(mp_obj_t timings_in) { STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_timings_obj, onewire_timings); STATIC mp_obj_t onewire_reset(mp_obj_t pin_in) { - return mp_obj_new_bool(esp_onewire_reset(mp_hal_get_pin_obj(pin_in))); + return mp_obj_new_bool(onewire_bus_reset(mp_hal_get_pin_obj(pin_in))); } STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_reset_obj, onewire_reset); STATIC mp_obj_t onewire_readbit(mp_obj_t pin_in) { - return MP_OBJ_NEW_SMALL_INT(esp_onewire_readbit(mp_hal_get_pin_obj(pin_in))); + return MP_OBJ_NEW_SMALL_INT(onewire_bus_readbit(mp_hal_get_pin_obj(pin_in))); } STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_readbit_obj, onewire_readbit); @@ -56,14 +110,14 @@ STATIC mp_obj_t onewire_readbyte(mp_obj_t pin_in) { mp_hal_pin_obj_t pin = mp_hal_get_pin_obj(pin_in); uint8_t value = 0; for (int i = 0; i < 8; ++i) { - value |= esp_onewire_readbit(pin) << i; + value |= onewire_bus_readbit(pin) << i; } return MP_OBJ_NEW_SMALL_INT(value); } STATIC MP_DEFINE_CONST_FUN_OBJ_1(onewire_readbyte_obj, onewire_readbyte); STATIC mp_obj_t onewire_writebit(mp_obj_t pin_in, mp_obj_t value_in) { - esp_onewire_writebit(mp_hal_get_pin_obj(pin_in), mp_obj_get_int(value_in)); + onewire_bus_writebit(mp_hal_get_pin_obj(pin_in), mp_obj_get_int(value_in)); return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_2(onewire_writebit_obj, onewire_writebit); @@ -72,7 +126,7 @@ STATIC mp_obj_t onewire_writebyte(mp_obj_t pin_in, mp_obj_t value_in) { mp_hal_pin_obj_t pin = mp_hal_get_pin_obj(pin_in); int value = mp_obj_get_int(value_in); for (int i = 0; i < 8; ++i) { - esp_onewire_writebit(pin, value & 1); + onewire_bus_writebit(pin, value & 1); value >>= 1; } return mp_const_none; |