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This commit is contained in:
Dan Halbert 2021-03-02 15:16:55 -05:00
parent 53a002a096
commit 9939c59caa
16 changed files with 133 additions and 59 deletions
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36
ports/raspberrypi/common-hal/busio/I2C.c
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@ -24,6 +24,7 @@
* THE SOFTWARE.
*/
#include "py/mperrno.h"
#include "py/mphal.h"
#include "shared-bindings/busio/I2C.h"
#include "py/runtime.h"
@ -94,17 +95,17 @@ void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
}
#endif
// Create a bitbangio.I2C object to do short writes.
// Must be done before setting up the I2C pins, since they will be
// set up as GPIO by the bitbangio.I2C object.
shared_module_bitbangio_i2c_construct(&self->bitbangio_i2c, scl, sda,
frequency, timeout);
gpio_set_function(sda->number, GPIO_FUNC_I2C);
gpio_set_function(scl->number, GPIO_FUNC_I2C);
self->baudrate = i2c_init(self->peripheral, frequency);
// Remember these in case we need to use bitbangio to do short writes.
self->sda = sda;
self->scl = scl;
self->frequency = frequency;
self->timeout = timeout;
self->sda_pin = sda->number;
self->scl_pin = scl->number;
claim_pin(sda);
@ -130,7 +131,7 @@ void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
}
bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
return common_hal_busio_i2c_write(self, addr, NULL, 0, false) == 0;
return common_hal_busio_i2c_write(self, addr, NULL, 0, true) == 0;
}
bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
@ -153,20 +154,19 @@ void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
const uint8_t *data, size_t len, bool transmit_stop_bit) {
if (len <= 2) {
// Give up pin ownership temporarily and use a bitbangio.I2C to do the write.
// Use a bitbangio.I2C to do the write.
reset_pin_number(self->sda_pin);
reset_pin_number(self->scl_pin);
bitbangio_i2c_obj_t bitbangio_i2c;
shared_module_bitbangio_i2c_construct(&bitbangio_i2c, self->sda, self->scl,
self->frequency, self->timeout);
uint8_t status = shared_module_bitbangio_i2c_write(&bitbangio_i2c, addr, data, len, transmit_stop_bit);
shared_module_bitbangio_i2c_deinit(&bitbangio_i2c);
gpio_set_function(self->sda_pin, GPIO_FUNC_SIO);
gpio_set_function(self->scl_pin, GPIO_FUNC_SIO);
gpio_set_dir(self->sda_pin, GPIO_IN);
gpio_put(self->sda_pin, true);
gpio_set_dir(self->scl_pin, GPIO_IN);
gpio_put(self->scl_pin, true);
// Take back the pins and restore them to hardware I2C functionality.
claim_pin(self->sda);
claim_pin(self->scl);
uint8_t status = shared_module_bitbangio_i2c_write(&self->bitbangio_i2c,
addr, data, len, transmit_stop_bit);
mp_hal_delay_us(20);
gpio_set_function(self->sda_pin, GPIO_FUNC_I2C);
gpio_set_function(self->scl_pin, GPIO_FUNC_I2C);

6
ports/raspberrypi/common-hal/busio/I2C.h
View File

@ -28,6 +28,7 @@
#define MICROPY_INCLUDED_RASPBERRYPI_COMMON_HAL_BUSIO_I2C_H
#include "common-hal/microcontroller/Pin.h"
#include "shared-module/bitbangio/I2C.h"
#include "py/obj.h"
@ -36,10 +37,7 @@
typedef struct {
mp_obj_base_t base;
i2c_inst_t * peripheral;
const mcu_pin_obj_t *scl;
const mcu_pin_obj_t *sda;
uint32_t frequency;
uint32_t timeout;
bitbangio_i2c_obj_t bitbangio_i2c;
bool has_lock;
uint baudrate;
uint8_t scl_pin;

30
ports/raspberrypi/common-hal/digitalio/DigitalInOut.c
View File

@ -43,6 +43,7 @@ digitalinout_result_t common_hal_digitalio_digitalinout_construct(
self->output = false;
self->open_drain = false;
// Set to input. No output value.
gpio_init(pin->number);
return DIGITALINOUT_OK;
}
@ -75,11 +76,17 @@ digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(
digitalio_digitalinout_obj_t* self, bool value,
digitalio_drive_mode_t drive_mode) {
const uint8_t pin = self->pin->number;
gpio_set_dir(pin, GPIO_OUT);
// TODO: Turn on "strong" pin driving (more current available).
gpio_disable_pulls(pin);
// Turn on "strong" pin driving (more current available).
hw_write_masked(&padsbank0_hw->io[pin],
PADS_BANK0_GPIO0_DRIVE_VALUE_12MA << PADS_BANK0_GPIO0_DRIVE_LSB,
PADS_BANK0_GPIO0_DRIVE_BITS);
self->output = true;
common_hal_digitalio_digitalinout_set_drive_mode(self, drive_mode);
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
// Pin direction is ultimately set in set_value. We don't need to do it here.
common_hal_digitalio_digitalinout_set_value(self, value);
return DIGITALINOUT_OK;
}
@ -92,10 +99,18 @@ digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
void common_hal_digitalio_digitalinout_set_value(
digitalio_digitalinout_obj_t* self, bool value) {
const uint8_t pin = self->pin->number;
if (self->open_drain) {
gpio_set_dir(pin, value ? GPIO_IN : GPIO_OUT);
} else {
if (self->open_drain && value) {
// If true and open-drain, set the direction -before- setting
// the pin value, to to avoid a high glitch on the pin before
// switching from output to input for open-drain.
gpio_set_dir(pin, GPIO_IN);
gpio_put(pin, value);
} else {
// Otherwise set the direction -after- setting the pin value,
// to avoid a glitch which might occur if the old value was
// different and the pin was previously set to input.
gpio_put(pin, value);
gpio_set_dir(pin, GPIO_OUT);
}
}
@ -110,9 +125,6 @@ digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(
const uint8_t pin = self->pin->number;
bool value = common_hal_digitalio_digitalinout_get_value(self);
self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
if (self->open_drain) {
gpio_put(pin, false);
}
// True is implemented differently between modes so reset the value to make
// sure it's correct for the new mode.
if (value) {

2
shared-bindings/bitbangio/I2C.h
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@ -30,7 +30,7 @@
#include "py/obj.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-module/bitbangio/types.h"
#include "shared-module/bitbangio/I2C.h"
// Type object used in Python. Should be shared between ports.
extern const mp_obj_type_t bitbangio_i2c_type;

2
shared-bindings/bitbangio/OneWire.h
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@ -28,7 +28,7 @@
#define MICROPY_INCLUDED_SHARED_BINDINGS_BITBANGIO_ONEWIRE_H
#include "common-hal/microcontroller/Pin.h"
#include "shared-module/bitbangio/types.h"
#include "shared-module/bitbangio/OneWire.h"
extern const mp_obj_type_t bitbangio_onewire_type;

2
shared-bindings/bitbangio/SPI.h
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@ -30,7 +30,7 @@
#include "py/obj.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-module/bitbangio/types.h"
#include "shared-module/bitbangio/SPI.h"
// Type object used in Python. Should be shared between ports.
extern const mp_obj_type_t bitbangio_spi_type;

1
shared-bindings/bitbangio/__init__.c
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@ -36,7 +36,6 @@
#include "shared-bindings/bitbangio/I2C.h"
#include "shared-bindings/bitbangio/OneWire.h"
#include "shared-bindings/bitbangio/SPI.h"
#include "shared-module/bitbangio/types.h"
#include "py/runtime.h"

1
shared-module/bitbangio/I2C.c
View File

@ -32,7 +32,6 @@
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-module/bitbangio/types.h"
#include "supervisor/shared/translate.h"
STATIC void delay(bitbangio_i2c_obj_t *self) {

43
shared-module/bitbangio/I2C.h Normal file
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@ -0,0 +1,43 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft
*
* 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.
*/
#ifndef MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_I2C_H
#define MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_I2C_H
#include "common-hal/digitalio/DigitalInOut.h"
#include "py/obj.h"
typedef struct {
mp_obj_base_t base;
digitalio_digitalinout_obj_t scl;
digitalio_digitalinout_obj_t sda;
uint32_t us_delay;
uint32_t us_timeout;
volatile bool locked;
} bitbangio_i2c_obj_t;
#endif // MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_I2C_H

1
shared-module/bitbangio/OneWire.c
View File

@ -28,7 +28,6 @@
#include "shared-bindings/bitbangio/OneWire.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-module/bitbangio/types.h"
// Durations are taken from here: https://www.maximintegrated.com/en/app-notes/index.mvp/id/126

39
shared-module/bitbangio/OneWire.h Normal file
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@ -0,0 +1,39 @@
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft
*
* 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.
*/
#ifndef MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_ONEWIRE_H
#define MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_ONEWIRE_H
#include "common-hal/digitalio/DigitalInOut.h"
#include "py/obj.h"
typedef struct {
mp_obj_base_t base;
digitalio_digitalinout_obj_t pin;
} bitbangio_onewire_obj_t;
#endif // MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_ONEWIRE_H

4
shared-module/bitbangio/SPI.c
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@ -29,9 +29,9 @@
#include "py/runtime.h"
#include "common-hal/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/bitbangio/SPI.h"
#include "shared-bindings/digitalio/DigitalInOut.h"
#include "shared-module/bitbangio/types.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "supervisor/shared/translate.h"
#define MAX_BAUDRATE (common_hal_mcu_get_clock_frequency() / 48)

20
shared-module/bitbangio/types.h → shared-module/bitbangio/SPI.h
View File

@ -24,27 +24,13 @@
* THE SOFTWARE.
*/
#ifndef MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_TYPES_H
#define MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_TYPES_H
#ifndef MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_SPI_H
#define MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_SPI_H
#include "common-hal/digitalio/DigitalInOut.h"
#include "py/obj.h"
typedef struct {
mp_obj_base_t base;
digitalio_digitalinout_obj_t scl;
digitalio_digitalinout_obj_t sda;
uint32_t us_delay;
uint32_t us_timeout;
volatile bool locked;
} bitbangio_i2c_obj_t;
typedef struct {
mp_obj_base_t base;
digitalio_digitalinout_obj_t pin;
} bitbangio_onewire_obj_t;
typedef struct {
mp_obj_base_t base;
digitalio_digitalinout_obj_t clock;
@ -58,4 +44,4 @@ typedef struct {
volatile bool locked:1;
} bitbangio_spi_obj_t;
#endif // MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_TYPES_H
#endif // MICROPY_INCLUDED_SHARED_MODULE_BITBANGIO_SPI_H

2
shared-module/busio/I2C.h
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@ -27,7 +27,7 @@
#ifndef MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSIO_I2C_H
#define MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSIO_I2C_H
#include "shared-module/bitbangio/types.h"
#include "shared-module/bitbangio/I2C.h"
#include "py/obj.h"

2
shared-module/busio/OneWire.h
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@ -27,7 +27,7 @@
#ifndef MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSIO_ONEWIRE_H
#define MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSIO_ONEWIRE_H
#include "shared-module/bitbangio/types.h"
#include "shared-module/bitbangio/OneWire.h"
#include "py/obj.h"

1
supervisor/shared/rgb_led_status.c
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@ -47,7 +47,6 @@ static uint8_t status_apa102_color[APA102_BUFFER_LENGTH] = {0, 0, 0, 0, 0xff, 0,
#if CIRCUITPY_BITBANG_APA102
#include "shared-bindings/bitbangio/SPI.h"
#include "shared-module/bitbangio/types.h"
static bitbangio_spi_obj_t status_apa102 = {
.base = {
.type = &bitbangio_spi_type,