circuitpython/shared-module/board/__init__.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "shared-bindings/board/__init__.h"
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#include "shared-bindings/microcontroller/Pin.h"
#include "shared-module/board/__init__.h"
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#include "mpconfigboard.h"
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#include "py/runtime.h"
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#if CIRCUITPY_BUSIO
#include "shared-bindings/busio/I2C.h"
#include "shared-bindings/busio/SPI.h"
#include "shared-bindings/busio/UART.h"
#endif
#if CIRCUITPY_DISPLAYIO
#include "shared-module/displayio/__init__.h"
#endif
#if CIRCUITPY_SHARPDISPLAY
#include "shared-bindings/sharpdisplay/SharpMemoryFramebuffer.h"
#include "shared-module/sharpdisplay/SharpMemoryFramebuffer.h"
#endif
#if CIRCUITPY_BOARD_I2C
// Statically allocate the I2C object so it can live past the end of the heap and into the next VM.
// That way it can be used by built-in I2CDisplay displays and be accessible through board.I2C().
typedef struct {
const mcu_pin_obj_t *scl;
const mcu_pin_obj_t *sda;
} board_i2c_pin_t;
static const board_i2c_pin_t i2c_pin[CIRCUITPY_BOARD_I2C] = CIRCUITPY_BOARD_I2C_PIN;
static busio_i2c_obj_t i2c_obj[CIRCUITPY_BOARD_I2C];
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static bool i2c_obj_created[CIRCUITPY_BOARD_I2C];
bool common_hal_board_is_i2c(mp_obj_t obj) {
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_I2C; instance++) {
if (obj == &i2c_obj[instance]) {
return true;
}
}
return false;
}
mp_obj_t common_hal_board_get_i2c(const mp_int_t instance) {
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return i2c_obj_created[instance] ? &i2c_obj[instance] : NULL;
}
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mp_obj_t common_hal_board_create_i2c(const mp_int_t instance) {
const mp_obj_t singleton = common_hal_board_get_i2c(instance);
if (singleton != NULL && !common_hal_busio_i2c_deinited(singleton)) {
return singleton;
}
busio_i2c_obj_t *self = &i2c_obj[instance];
self->base.type = &busio_i2c_type;
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assert_pin_free(i2c_pin[instance].scl);
assert_pin_free(i2c_pin[instance].sda);
common_hal_busio_i2c_construct(self, i2c_pin[instance].scl, i2c_pin[instance].sda, 100000, 255);
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i2c_obj_created[instance] = true;
return &i2c_obj[instance];
}
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#endif
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#if CIRCUITPY_BOARD_SPI
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// Statically allocate the SPI object so it can live past the end of the heap and into the next VM.
// That way it can be used by built-in FourWire displays and be accessible through board.SPI().
typedef struct {
const mcu_pin_obj_t *clock;
const mcu_pin_obj_t *mosi;
const mcu_pin_obj_t *miso;
} board_spi_pin_t;
static const board_spi_pin_t spi_pin[CIRCUITPY_BOARD_SPI] = CIRCUITPY_BOARD_SPI_PIN;
static busio_spi_obj_t spi_obj[CIRCUITPY_BOARD_SPI];
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static bool spi_obj_created[CIRCUITPY_BOARD_SPI];
bool common_hal_board_is_spi(mp_obj_t obj) {
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_SPI; instance++) {
if (obj == &spi_obj[instance]) {
return true;
}
}
return false;
}
mp_obj_t common_hal_board_get_spi(const mp_int_t instance) {
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return spi_obj_created[instance] ? &spi_obj[instance] : NULL;
}
mp_obj_t common_hal_board_create_spi(const mp_int_t instance) {
const mp_obj_t singleton = common_hal_board_get_spi(instance);
if (singleton != NULL && !common_hal_busio_spi_deinited(singleton)) {
return singleton;
}
busio_spi_obj_t *self = &spi_obj[instance];
self->base.type = &busio_spi_type;
assert_pin_free(spi_pin[instance].clock);
assert_pin_free(spi_pin[instance].mosi);
assert_pin_free(spi_pin[instance].miso);
common_hal_busio_spi_construct(self, spi_pin[instance].clock, spi_pin[instance].mosi, spi_pin[instance].miso, false);
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spi_obj_created[instance] = true;
return &spi_obj[instance];
}
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#endif
#if CIRCUITPY_BOARD_UART
MP_REGISTER_ROOT_POINTER(mp_obj_t board_uart_bus);
typedef struct {
const mcu_pin_obj_t *tx;
const mcu_pin_obj_t *rx;
} board_uart_pin_t;
static const board_uart_pin_t uart_pin[CIRCUITPY_BOARD_UART] = CIRCUITPY_BOARD_UART_PIN;
static busio_uart_obj_t uart_obj[CIRCUITPY_BOARD_UART];
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static bool uart_obj_created[CIRCUITPY_BOARD_UART];
bool common_hal_board_is_uart(mp_obj_t obj) {
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_UART; instance++) {
if (obj == &uart_obj[instance]) {
return true;
}
}
return false;
}
mp_obj_t common_hal_board_get_uart(const mp_int_t instance) {
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return uart_obj_created[instance] ? &uart_obj[instance] : NULL;
}
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mp_obj_t common_hal_board_create_uart(const mp_int_t instance) {
const mp_obj_t singleton = common_hal_board_get_uart(instance);
if (singleton != NULL && !common_hal_busio_uart_deinited(singleton)) {
return singleton;
}
busio_uart_obj_t *self = &uart_obj[instance];
self->base.type = &busio_uart_type;
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MP_STATE_VM(board_uart_bus) = &uart_obj;
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assert_pin_free(uart_pin[instance].tx);
assert_pin_free(uart_pin[instance].rx);
common_hal_busio_uart_construct(self, uart_pin[instance].tx, uart_pin[instance].rx,
NULL, NULL, NULL, false, 9600, 8, BUSIO_UART_PARITY_NONE, 1, 1.0f, 64, NULL, false);
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uart_obj_created[instance] = true;
return &uart_obj[instance];
}
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#endif
void reset_board_buses(void) {
#if CIRCUITPY_BOARD_I2C
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_I2C; instance++) {
bool display_using_i2c = false;
#if CIRCUITPY_I2CDISPLAYBUS
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
if (display_buses[i].bus_base.type == &i2cdisplaybus_i2cdisplaybus_type && display_buses[i].i2cdisplay_bus.bus == &i2c_obj[instance]) {
display_using_i2c = true;
break;
}
}
#endif
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if (i2c_obj_created[instance]) {
// make sure I2C lock is not held over a soft reset
common_hal_busio_i2c_unlock(&i2c_obj[instance]);
if (!display_using_i2c) {
common_hal_busio_i2c_deinit(&i2c_obj[instance]);
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i2c_obj_created[instance] = false;
}
}
}
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#endif
#if CIRCUITPY_BOARD_SPI
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_SPI; instance++) {
bool display_using_spi = false;
#if CIRCUITPY_FOURWIRE || CIRCUITPY_SHARPDISPLAY
for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
mp_const_obj_t bus_type = display_buses[i].bus_base.type;
#if CIRCUITPY_FOURWIRE
if (bus_type == &fourwire_fourwire_type && display_buses[i].fourwire_bus.bus == &spi_obj[instance]) {
display_using_spi = true;
break;
}
#endif
#if CIRCUITPY_SHARPDISPLAY
if (bus_type == &sharpdisplay_framebuffer_type && display_buses[i].sharpdisplay.bus == &spi_obj[instance]) {
display_using_spi = true;
break;
}
#endif
}
#endif
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if (spi_obj_created[instance]) {
// make sure SPI lock is not held over a soft reset
common_hal_busio_spi_unlock(&spi_obj[instance]);
if (!display_using_spi) {
common_hal_busio_spi_deinit(&spi_obj[instance]);
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spi_obj_created[instance] = false;
}
}
}
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#endif
#if CIRCUITPY_BOARD_UART
for (uint8_t instance = 0; instance < CIRCUITPY_BOARD_UART; instance++) {
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if (uart_obj_created[instance]) {
common_hal_busio_uart_deinit(&uart_obj[instance]);
uart_obj_created[instance] = false;
}
}
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#endif
}