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feat(ulp): Improved ULP delay API accuracy and removed floating point operations

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Closes https://github.com/espressif/esp-idf/issues/17494
Closes https://github.com/espressif/esp-idf/issues/16891
This commit is contained in:
Konstantin Kondrashov
2026-03-05 10:39:34 +02:00
parent bbee94f718
commit 74561963e1
20 changed files with 640 additions and 73 deletions
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examples/system/ulp/ulp_riscv/i2c/main/ulp/main.c
+7 -7
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2022-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
@@ -71,7 +71,7 @@ static void bmp180_read_ut_data(int16_t *ut_data)
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_MS);
ulp_riscv_delay_us(5000);
/* Read uncompensated temperature data */
bmp180_read16((uint16_t *)ut_data, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
@@ -92,26 +92,26 @@ static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode)
{
case OSS_0:
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0;
wait = 5; // Wait atleast 4.5 msec
wait = 5; // Wait at least 4.5 msec
break;
case OSS_1:
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1;
wait = 8; // Wait atleast 7.5 msec
wait = 8; // Wait at least 7.5 msec
break;
case OSS_2:
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2;
wait = 14; // Wait atleast 13.5 msec
wait = 14; // Wait at least 13.5 msec
break;
case OSS_3:
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3;
wait = 26; // Wait atleast 25.5 msec
wait = 26; // Wait at least 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_MS);
ulp_riscv_delay_us(wait * 1000);
/* Read uncompensated temperature data */