229 lines
7.4 KiB
C
229 lines
7.4 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2020 Scott Shawcroft for Adafruit Industries LLC
|
|
*
|
|
* 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/busio/I2C.h"
|
|
#include "py/mperrno.h"
|
|
#include "py/runtime.h"
|
|
|
|
#include "components/driver/include/driver/i2c.h"
|
|
|
|
#include "shared-bindings/microcontroller/__init__.h"
|
|
#include "shared-bindings/microcontroller/Pin.h"
|
|
#include "supervisor/shared/translate.h"
|
|
|
|
typedef enum {
|
|
STATUS_FREE = 0,
|
|
STATUS_IN_USE,
|
|
STATUS_NEVER_RESET
|
|
} i2c_status_t;
|
|
|
|
static i2c_status_t i2c_status[I2C_NUM_MAX];
|
|
|
|
void never_reset_i2c(i2c_port_t num) {
|
|
i2c_status[num] = STATUS_NEVER_RESET;
|
|
}
|
|
|
|
void i2c_reset(void) {
|
|
for (i2c_port_t num = 0; num < I2C_NUM_MAX; num++) {
|
|
if (i2c_status[num] == STATUS_IN_USE) {
|
|
i2c_driver_delete(num);
|
|
i2c_status[num] = STATUS_FREE;
|
|
}
|
|
}
|
|
}
|
|
|
|
void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
|
|
const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency, uint32_t timeout) {
|
|
// Pins 45 and 46 are "strapping" pins that impact start up behavior. They usually need to
|
|
// be pulled-down so pulling them up for I2C is a bad idea. To make this hard, we don't
|
|
// support I2C on these pins.
|
|
//
|
|
// 46 is also input-only so it'll never work.
|
|
if (scl->number == 45 || scl->number == 46 || sda->number == 45 || sda->number == 46) {
|
|
mp_raise_ValueError(translate("Invalid pins"));
|
|
}
|
|
|
|
#if CIRCUITPY_REQUIRE_I2C_PULLUPS
|
|
// Test that the pins are in a high state. (Hopefully indicating they are pulled up.)
|
|
gpio_set_direction(sda->number, GPIO_MODE_DEF_INPUT);
|
|
gpio_set_direction(scl->number, GPIO_MODE_DEF_INPUT);
|
|
|
|
gpio_pulldown_en(sda->number);
|
|
gpio_pulldown_en(scl->number);
|
|
|
|
common_hal_mcu_delay_us(10);
|
|
|
|
gpio_pulldown_dis(sda->number);
|
|
gpio_pulldown_dis(scl->number);
|
|
|
|
// We must pull up within 3us to achieve 400khz.
|
|
common_hal_mcu_delay_us(3);
|
|
|
|
if (gpio_get_level(sda->number) == 0 || gpio_get_level(scl->number) == 0) {
|
|
reset_pin_number(sda->number);
|
|
reset_pin_number(scl->number);
|
|
mp_raise_RuntimeError(translate("SDA or SCL needs a pull up"));
|
|
}
|
|
#endif
|
|
|
|
|
|
if (xSemaphoreCreateBinaryStatic(&self->semaphore) != &self->semaphore) {
|
|
mp_raise_RuntimeError(translate("Unable to create lock"));
|
|
}
|
|
xSemaphoreGive(&self->semaphore);
|
|
self->sda_pin = sda;
|
|
self->scl_pin = scl;
|
|
self->i2c_num = I2C_NUM_MAX;
|
|
for (i2c_port_t num = 0; num < I2C_NUM_MAX; num++) {
|
|
if (i2c_status[num] == STATUS_FREE) {
|
|
self->i2c_num = num;
|
|
}
|
|
}
|
|
if (self->i2c_num == I2C_NUM_MAX) {
|
|
mp_raise_ValueError(translate("All I2C peripherals are in use"));
|
|
}
|
|
i2c_status[self->i2c_num] = STATUS_IN_USE;
|
|
i2c_config_t i2c_conf = {
|
|
.mode = I2C_MODE_MASTER,
|
|
.sda_io_num = self->sda_pin->number,
|
|
.scl_io_num = self->scl_pin->number,
|
|
.sda_pullup_en = GPIO_PULLUP_DISABLE, /*!< Internal GPIO pull mode for I2C sda signal*/
|
|
.scl_pullup_en = GPIO_PULLUP_DISABLE, /*!< Internal GPIO pull mode for I2C scl signal*/
|
|
|
|
.master = {
|
|
.clk_speed = frequency,
|
|
}
|
|
};
|
|
esp_err_t result = i2c_param_config(self->i2c_num, &i2c_conf);
|
|
if (result != ESP_OK) {
|
|
mp_raise_ValueError(translate("Invalid pins"));
|
|
}
|
|
result = i2c_driver_install(self->i2c_num,
|
|
I2C_MODE_MASTER,
|
|
0,
|
|
0,
|
|
0);
|
|
if (result != ESP_OK) {
|
|
mp_raise_OSError(MP_EIO);
|
|
}
|
|
|
|
claim_pin(sda);
|
|
claim_pin(scl);
|
|
}
|
|
|
|
bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
|
|
return self->sda_pin == NULL;
|
|
}
|
|
|
|
void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
|
|
if (common_hal_busio_i2c_deinited(self)) {
|
|
return;
|
|
}
|
|
|
|
i2c_driver_delete(self->i2c_num);
|
|
i2c_status[self->i2c_num] = STATUS_FREE;
|
|
|
|
common_hal_reset_pin(self->sda_pin);
|
|
common_hal_reset_pin(self->scl_pin);
|
|
self->sda_pin = NULL;
|
|
self->scl_pin = NULL;
|
|
}
|
|
|
|
bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_start(cmd);
|
|
i2c_master_write_byte(cmd, addr << 1, true);
|
|
i2c_master_stop(cmd);
|
|
esp_err_t result = i2c_master_cmd_begin(self->i2c_num, cmd, 10);
|
|
i2c_cmd_link_delete(cmd);
|
|
return result == ESP_OK;
|
|
}
|
|
|
|
bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
|
|
if (self->has_lock) {
|
|
return false;
|
|
}
|
|
self->has_lock = xSemaphoreTake(&self->semaphore, 0) == pdTRUE;
|
|
return self->has_lock;
|
|
}
|
|
|
|
bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
|
|
return self->has_lock;
|
|
}
|
|
|
|
void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
|
|
xSemaphoreGive(&self->semaphore);
|
|
self->has_lock = false;
|
|
}
|
|
|
|
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) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_start(cmd);
|
|
i2c_master_write_byte(cmd, addr << 1, true);
|
|
i2c_master_write(cmd, (uint8_t*) data, len, true);
|
|
if (transmit_stop_bit) {
|
|
i2c_master_stop(cmd);
|
|
}
|
|
esp_err_t result = i2c_master_cmd_begin(self->i2c_num, cmd, 100 /* wait in ticks */);
|
|
i2c_cmd_link_delete(cmd);
|
|
|
|
if (result == ESP_OK) {
|
|
return 0;
|
|
} else if (result == ESP_FAIL) {
|
|
return MP_ENODEV;
|
|
}
|
|
return MP_EIO;
|
|
}
|
|
|
|
uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
|
|
uint8_t *data, size_t len) {
|
|
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
|
|
i2c_master_start(cmd);
|
|
i2c_master_write_byte(cmd, addr << 1 | 1, true); // | 1 to indicate read
|
|
if (len > 1) {
|
|
i2c_master_read(cmd, data, len - 1, 0);
|
|
}
|
|
i2c_master_read_byte(cmd, data + len - 1, 1);
|
|
i2c_master_stop(cmd);
|
|
esp_err_t result = i2c_master_cmd_begin(self->i2c_num, cmd, 100 /* wait in ticks */);
|
|
i2c_cmd_link_delete(cmd);
|
|
|
|
if (result == ESP_OK) {
|
|
return 0;
|
|
} else if (result == ESP_FAIL) {
|
|
return MP_ENODEV;
|
|
}
|
|
return MP_EIO;
|
|
}
|
|
|
|
void common_hal_busio_i2c_never_reset(busio_i2c_obj_t *self) {
|
|
never_reset_i2c(self->i2c_num);
|
|
|
|
common_hal_never_reset_pin(self->scl_pin);
|
|
common_hal_never_reset_pin(self->sda_pin);
|
|
}
|