mirror of
https://github.com/espressif/esp-idf.git
synced 2024-09-27 11:33:25 -04:00
4fde033a5f
This commit adds support for using the RTC I2C peripheral on the ULP RISC-V core for esp32s2 and esp32s3. It also adds an example to demonstrate the usage of the RTC I2C peripheral. This commit also modifies the rtc_i2c register structure files to enable the use of bitfields in the ULP RISC-V RTC I2C driver.
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Unlicense OR CC0-1.0
|
|
*/
|
|
/* ULP RISC-V RTC I2C example
|
|
|
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
|
|
|
Unless required by applicable law or agreed to in writing, this
|
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
CONDITIONS OF ANY KIND, either express or implied.
|
|
|
|
This code runs on ULP RISC-V coprocessor
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include "ulp_riscv.h"
|
|
#include "ulp_riscv_utils.h"
|
|
#include "ulp_riscv_i2c_ulp_core.h"
|
|
#include "../bmp180_defs.h"
|
|
|
|
/************************************************
|
|
* Shared data between main CPU and ULP
|
|
************************************************/
|
|
int16_t ut_data = 0;
|
|
int32_t up_data = 0;
|
|
int32_t ut_threshold = EXAMPLE_UT_THRESHOLD;
|
|
int32_t up_threshold = EXAMPLE_UP_THRESHOLD;
|
|
oss_mode_t oss_mode = EXAMPLE_OSS_MODE;
|
|
|
|
int main (void)
|
|
{
|
|
/* Read uncompensated temperature */
|
|
bmp180_read_ut_data(&ut_data);
|
|
|
|
/* Read uncompensated pressure */
|
|
bmp180_read_up_data(&up_data, oss_mode);
|
|
|
|
/* Wakeup the main CPU if either the uncompensated temperature or uncompensated pressure values
|
|
* are more than their respective threshold values.
|
|
*/
|
|
if ((ut_data > ut_threshold) || (up_data > up_threshold)) {
|
|
ulp_riscv_wakeup_main_processor();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb)
|
|
{
|
|
uint8_t data_rd = 0;
|
|
*data_out = 0;
|
|
|
|
ulp_riscv_i2c_master_set_slave_reg_addr(reg_msb);
|
|
ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
|
|
*data_out |= (uint16_t)(data_rd << 8);
|
|
ulp_riscv_i2c_master_set_slave_reg_addr(reg_lsb);
|
|
data_rd = 0;
|
|
ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
|
|
*data_out |= (uint16_t)(data_rd);
|
|
}
|
|
|
|
static void bmp180_read_ut_data(int16_t *ut_data)
|
|
{
|
|
/* Set slave register address to the control register */
|
|
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
|
|
|
|
/* Setup control register to read temperature */
|
|
uint8_t cmd = BMP180_SENSOR_CMD_READ_TEMPERATURE;
|
|
ulp_riscv_i2c_master_write_to_device(&cmd, 1);
|
|
|
|
/* Wait at least 4.5 milliseconds for the sensor to complete the reading */
|
|
ulp_riscv_delay_cycles(5 * ULP_RISCV_CYCLES_PER_US * 1000);
|
|
|
|
/* Read uncompensated temperature data */
|
|
bmp180_read16((uint16_t *)ut_data, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
|
|
}
|
|
|
|
static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode)
|
|
{
|
|
uint16_t press_high;
|
|
uint8_t press_low;
|
|
|
|
/* Set slave register address to the control register */
|
|
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
|
|
|
|
/* Setup control register to read pressure */
|
|
uint8_t cmd = 0;
|
|
uint8_t wait = 0;
|
|
switch(oss_mode)
|
|
{
|
|
case OSS_0:
|
|
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0;
|
|
wait = 5; // Wait atleast 4.5 msec
|
|
break;
|
|
case OSS_1:
|
|
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1;
|
|
wait = 8; // Wait atleast 7.5 msec
|
|
break;
|
|
case OSS_2:
|
|
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2;
|
|
wait = 14; // Wait atleast 13.5 msec
|
|
break;
|
|
case OSS_3:
|
|
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3;
|
|
wait = 26; // Wait atleast 25.5 msec
|
|
break;
|
|
}
|
|
|
|
ulp_riscv_i2c_master_write_to_device(&cmd, 1);
|
|
|
|
/* Wait for the required amount of time for the sensor to complete the reading */
|
|
ulp_riscv_delay_cycles(wait * ULP_RISCV_CYCLES_PER_US * 1000);
|
|
|
|
/* Read uncompensated temperature data */
|
|
|
|
/* Read MSB + LSB */
|
|
bmp180_read16(&press_high, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
|
|
|
|
/* Read XLSB */
|
|
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB);
|
|
ulp_riscv_i2c_master_read_from_device(&press_low, 1);
|
|
|
|
*up_data = (((uint32_t)press_high << 8) + (uint32_t)press_low) >> (8 - oss_mode);
|
|
}
|