온도 adc 측정 추가

CMakeLists.txt

@@ -10,6 +10,7 @@ target_include_directories(app PRIVATE
     src/drivers/battery
     src/drivers/led
     src/drivers/imu
+    src/drivers/temperature
 )
 
 target_sources(app PRIVATE
@@ -20,4 +21,5 @@ target_sources(app PRIVATE
     src/drivers/battery/battery_adc.c
     src/drivers/led/led_control.c
     src/drivers/imu/imu_i2c.c
+    src/drivers/temperature/tmp235.c
 )

boards/nrf52840dk_nrf52840.overlay

@@ -12,7 +12,9 @@
  *   IMU_SDA:      P1.15 (I2C0 data)
  */
 
+/* ADC 채널 공통 매크로 (ADC_GAIN_*, ADC_REF_*, ADC_ACQ_TIME 등) */
 #include <zephyr/dt-bindings/adc/adc.h>
+/* nRF SAADC 전용 매크로 (NRF_SAADC_AIN* 채널 번호 정의) */
 #include <zephyr/dt-bindings/adc/nrf-saadc.h>
 /* nRF 핀 컨트롤 매크로 (NRF_PSEL - I2C/SPI 등 핀 재배치에 필요) */
 #include <zephyr/dt-bindings/pinctrl/nrf-pinctrl.h>
@@ -64,6 +66,20 @@
 		zephyr,resolution = <12>;
 		zephyr,oversampling = <2>;	/* 2^2 = 4X */
 	};
+
+	/* 온도 센서 채널 (AIN3 = P0.05, TMP235-Q1)
+	 * 1/6 gain + 0.6V ref → 풀스케일 3.6V
+	 * TMP235 출력 범위: 100mV(-40°C) ~ 2000mV(150°C) */
+	channel@3
+	{
+		reg = <3>;
+		zephyr,gain = "ADC_GAIN_1_6";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40)>;
+		zephyr,input-positive = <NRF_SAADC_AIN3>;
+		zephyr,resolution = <12>;
+		zephyr,oversampling = <2>;	/* 2^2 = 4X */
+	};
 };
 
 /* P0.04(AIN2)가 DK Arduino 헤더에 GPIO로 잡혀있어서 SAADC 충돌 → 비활성화 */
@@ -76,7 +92,8 @@
 	/* ADC 채널을 코드에서 참조하기 위한 zephyr,user 노드 */
 	zephyr,user
 	{
-		io-channels = <&adc 2>;
+		io-channels = <&adc 2>, <&adc 3>;
+		io-channel-names = "battery", "temperature";
 	};
 
 	led

src/drivers/battery/battery_adc.c

@@ -29,7 +29,7 @@
 #define ZEPHYR_USER_NODE DT_PATH(zephyr_user)
 
 /* 디바이스트리에서 ADC 채널 스펙 가져오기 (gain, ref, acq time, input, resolution, oversampling) */
-static const struct adc_dt_spec battery_adc = ADC_DT_SPEC_GET(ZEPHYR_USER_NODE);
+static const struct adc_dt_spec battery_adc = ADC_DT_SPEC_GET_BY_NAME(ZEPHYR_USER_NODE, battery);
 
 static int16_t adc_buffer;
 

src/drivers/temperature/tmp235.c

@@ -0,0 +1,109 @@
+/*******************************************************************************
+ * @file    tmp235.c
+ * @brief   TMP235-Q1 온도 센서 드라이버 (Zephyr SAADC, AIN3 = P0.05)
+ *
+ * 배터리 ADC와 동일한 방식 (ADC_DT_SPEC_GET_BY_NAME + adc_read_dt).
+ * 채널 설정은 overlay channel@3에서 관리.
+ *
+ * 변환 공식:
+ *   V_mV = raw × 3600 / 4095        (1/6 gain, 0.6V ref, 12-bit)
+ *   T(°C × 100) = (V_mV - 500) × 10
+ ******************************************************************************/
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/devicetree.h>
+#include <limits.h>
+
+#include "tmp235.h"
+#include "debug_print.h"
+
+/*==============================================================================
+ * ADC 디바이스트리 설정
+ *============================================================================*/
+#define ZEPHYR_USER_NODE DT_PATH(zephyr_user)
+
+static const struct adc_dt_spec temp_adc =
+    ADC_DT_SPEC_GET_BY_NAME(ZEPHYR_USER_NODE, temperature);
+
+static int16_t adc_buffer;
+
+/*==============================================================================
+ * 내부 변환
+ *============================================================================*/
+
+/**
+ * @brief ADC raw → 온도 (°C × 100)
+ *
+ * V_mV = raw × 3600 / 4095
+ * T_cdeg = (V_mV - 500) × 10
+ *
+ * 정수 연산 (오버플로 없음):
+ *   raw 최대 4095 → V_mV 최대 3600 → T_cdeg 최대 31000 → int32 OK
+ */
+static int16_t raw_to_cdeg(int16_t raw)
+{
+    if (raw < 0) {
+        raw = 0;
+    }
+    int32_t v_mv = (int32_t)raw * 3600 / 4095;
+    int32_t t_cdeg = (v_mv - 500) * 10;
+    return (int16_t)t_cdeg;
+}
+
+/*==============================================================================
+ * 공개 API
+ *============================================================================*/
+
+int temp_init(void)
+{
+    if (!adc_is_ready_dt(&temp_adc)) {
+        DBG_PRINTF("[TEMP] FAIL — ADC device not ready\r\n");
+        return -1;
+    }
+
+    int err = adc_channel_setup_dt(&temp_adc);
+    if (err) {
+        DBG_PRINTF("[TEMP] FAIL — channel setup (err=%d)\r\n", err);
+        return -2;
+    }
+
+    DBG_PRINTF("[TEMP] OK — TMP235 ch=%d, res=%d, os=%d\r\n",
+               temp_adc.channel_id,
+               temp_adc.resolution,
+               temp_adc.oversampling);
+    return 0;
+}
+
+int16_t temp_read_cdeg(void)
+{
+    /* 매번 채널 재설정 (배터리 ADC와 SAADC 공유) */
+    int err = adc_channel_setup_dt(&temp_adc);
+    if (err) {
+        DBG_PRINTF("[TEMP] FAIL — channel setup (err=%d)\r\n", err);
+        return INT16_MIN;
+    }
+
+    struct adc_sequence seq = {0};
+
+    err = adc_sequence_init_dt(&temp_adc, &seq);
+    if (err) {
+        DBG_PRINTF("[TEMP] FAIL — sequence init (err=%d)\r\n", err);
+        return INT16_MIN;
+    }
+
+    seq.buffer      = &adc_buffer;
+    seq.buffer_size = sizeof(adc_buffer);
+
+    err = adc_read_dt(&temp_adc, &seq);
+    if (err) {
+        DBG_PRINTF("[TEMP] FAIL — read (err=%d)\r\n", err);
+        return INT16_MIN;
+    }
+
+    int16_t t = raw_to_cdeg(adc_buffer);
+
+    DBG_PRINTF("[TEMP] raw=%d -> %d.%02d C\r\n",
+               adc_buffer, t / 100, (t < 0 ? -t : t) % 100);
+
+    return t;
+}

src/drivers/temperature/tmp235.h

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * @file    tmp235.h
+ * @brief   TMP235-Q1 온도 센서 드라이버 (Zephyr SAADC, AIN3 = P0.05)
+ *
+ * 출력 공식: V = 500mV + 10mV/°C × T
+ *   → T(°C)   = (V_mV - 500) / 10
+ *   → T(°Cx100) = (V_mV - 500) × 10
+ ******************************************************************************/
+
+#ifndef TMP235_H__
+#define TMP235_H__
+
+#include <stdint.h>
+
+/**
+ * @brief 온도 센서 초기화 — ADC 채널 설정
+ * @return 0 성공, 음수 에러
+ */
+int temp_init(void);
+
+/**
+ * @brief 온도 1회 측정
+ * @return 온도 (°C × 100), 에러 시 INT16_MIN
+ */
+int16_t temp_read_cdeg(void);
+
+#endif /* TMP235_H__ */

src/main.c

@@ -24,6 +24,7 @@
 #include "battery_adc.h"
 #include "parser.h"
 #include "imu_i2c.h"
+#include "tmp235.h"
 
 LOG_MODULE_REGISTER(vesiscan, LOG_LEVEL_INF);
 
@@ -309,8 +310,9 @@ int main(void)
     led_init();
     battery_adc_init();
     battery_timer_init();
-    DBG_PRINTF("  gpio/timer/config/led/batt OK\r\n");
     imu_init();
+    temp_init();
+    DBG_PRINTF("  gpio/timer/config/led/batt/imu/temp OK\r\n");
 
     /*── Phase 2: BLE 스택 + NUS ──*/
     DBG_PRINTF("[2] BLE Init\r\n");