144 lines
4.9 KiB
C
144 lines
4.9 KiB
C
// Copyright 2016-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <esp_types.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "esp_log.h"
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#include "soc/rtc_io_reg.h"
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#include "soc/rtc_io_struct.h"
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#include "soc/sens_reg.h"
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#include "soc/sens_struct.h"
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#include "temp_sensor.h"
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#include "esp32s2/rom/ets_sys.h"
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static const char *TAG = "tsens";
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#define TSENS_CHECK(res, ret_val) ({ \
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if (!(res)) { \
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ESP_LOGE(TAG, "%s:%d (%s)", __FILE__, __LINE__, __FUNCTION__); \
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return (ret_val); \
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} \
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})
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#define TSENS_XPD_WAIT_DEFAULT 0xFF /* Set wait cycle time(8MHz) from power up to reset enable. */
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#define TSENS_ADC_FACTOR (0.4386)
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#define TSENS_DAC_FACTOR (27.88)
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#define TSENS_SYS_OFFSET (20.52)
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typedef struct {
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int index;
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int offset;
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int set_val;
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int range_min;
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int range_max;
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int error_max;
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} tsens_dac_offset_t;
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static const tsens_dac_offset_t dac_offset[TSENS_DAC_MAX] = {
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/* DAC Offset reg_val min max error */
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{TSENS_DAC_L0, -2, 5, 50, 125, 3},
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{TSENS_DAC_L1, -1, 7, 20, 100, 2},
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{TSENS_DAC_L2, 0, 15, -10, 80, 1},
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{TSENS_DAC_L3, 1, 11, -30, 50, 2},
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{TSENS_DAC_L4, 2, 10, -40, 20, 3},
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};
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static SemaphoreHandle_t rtc_tsens_mux = NULL;
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esp_err_t temp_sensor_set_config(temp_sensor_config_t tsens)
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{
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SENS.sar_tctrl.tsens_dac = dac_offset[tsens.dac_offset].set_val;
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SENS.sar_tctrl.tsens_clk_div = tsens.clk_div;
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SENS.sar_tctrl.tsens_power_up_force = 1;
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SENS.sar_tctrl2.tsens_xpd_wait = TSENS_XPD_WAIT_DEFAULT;
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SENS.sar_tctrl2.tsens_xpd_force = 1;
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SENS.sar_tctrl2.tsens_reset = 1;// Reset the temp sensor.
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SENS.sar_tctrl2.tsens_reset = 0;// Clear the reset status.
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ESP_LOGI(TAG, "Config temperature range [%d°C ~ %d°C], error < %d°C",
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dac_offset[tsens.dac_offset].range_min,
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dac_offset[tsens.dac_offset].range_max,
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dac_offset[tsens.dac_offset].error_max);
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return ESP_OK;
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}
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esp_err_t temp_sensor_get_config(temp_sensor_config_t *tsens)
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{
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TSENS_CHECK(tsens != NULL, ESP_ERR_INVALID_ARG);
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tsens->dac_offset = SENS.sar_tctrl.tsens_dac;
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for(int i=TSENS_DAC_L0; i<TSENS_DAC_MAX; i++) {
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if(tsens->dac_offset == dac_offset[i].set_val) {
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tsens->dac_offset = dac_offset[i].index;
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break;
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}
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}
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tsens->clk_div = SENS.sar_tctrl.tsens_clk_div;
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return ESP_OK;
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}
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esp_err_t temp_sensor_start(void)
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{
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if (rtc_tsens_mux == NULL) {
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rtc_tsens_mux = xSemaphoreCreateMutex();
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}
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TSENS_CHECK(rtc_tsens_mux != NULL, ESP_ERR_NO_MEM);
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SENS.sar_tctrl.tsens_dump_out = 0;
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SENS.sar_tctrl2.tsens_clkgate_en = 1;
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SENS.sar_tctrl.tsens_power_up = 1;
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return ESP_OK;
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}
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esp_err_t temp_sensor_stop(void)
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{
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SENS.sar_tctrl.tsens_power_up = 0;
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SENS.sar_tctrl2.tsens_clkgate_en = 0;
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if (rtc_tsens_mux != NULL) {
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vSemaphoreDelete(rtc_tsens_mux);
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rtc_tsens_mux = NULL;
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}
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return ESP_OK;
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}
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esp_err_t temp_sensor_read_raw(uint32_t *tsens_out)
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{
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TSENS_CHECK(tsens_out != NULL, ESP_ERR_INVALID_ARG);
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TSENS_CHECK(rtc_tsens_mux != NULL, ESP_ERR_INVALID_STATE);
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xSemaphoreTake(rtc_tsens_mux, portMAX_DELAY);
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SENS.sar_tctrl.tsens_dump_out = 1;
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while (!SENS.sar_tctrl.tsens_ready);
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*tsens_out = SENS.sar_tctrl.tsens_out;
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SENS.sar_tctrl.tsens_dump_out = 0;
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xSemaphoreGive(rtc_tsens_mux);
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return ESP_OK;
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}
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esp_err_t temp_sensor_read_celsius(float *celsius)
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{
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TSENS_CHECK(celsius != NULL, ESP_ERR_INVALID_ARG);
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temp_sensor_config_t tsens;
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uint32_t tsens_out = 0;
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esp_err_t ret = temp_sensor_get_config(&tsens);
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if (ret == ESP_OK) {
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ret = temp_sensor_read_raw(&tsens_out);
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TSENS_CHECK(ret == ESP_OK, ret);
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const tsens_dac_offset_t *dac = &dac_offset[tsens.dac_offset];
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*celsius = (TSENS_ADC_FACTOR * (float)tsens_out - TSENS_DAC_FACTOR * dac->offset - TSENS_SYS_OFFSET);
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if (*celsius < dac->range_min || *celsius > dac->range_max) {
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ESP_LOGW(TAG, "Exceeding the temperature range!");
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ret = ESP_ERR_INVALID_STATE;
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}
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}
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return ret;
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}
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