dust sensor: first working sketch

STM32F100_ParaTNC/system/src/davis_vantage/subdir.mk

@@ -5,15 +5,18 @@
 # Add inputs and outputs from these tool invocations to the build variables 
 C_SRCS += \
 ../system/src/davis_vantage/davis.c \
-../system/src/davis_vantage/davis_parsers.c 
+../system/src/davis_vantage/davis_parsers.c \
+../system/src/davis_vantage/sds011.c 
 
 OBJS += \
 ./system/src/davis_vantage/davis.o \
-./system/src/davis_vantage/davis_parsers.o 
+./system/src/davis_vantage/davis_parsers.o \
+./system/src/davis_vantage/sds011.o 
 
 C_DEPS += \
 ./system/src/davis_vantage/davis.d \
-./system/src/davis_vantage/davis_parsers.d 
+./system/src/davis_vantage/davis_parsers.d \
+./system/src/davis_vantage/sds011.d 
 
 
 # Each subdirectory must supply rules for building sources it contributes

STM32L476_ParaMETEO/system/src/davis_vantage/subdir.mk

@@ -5,15 +5,18 @@
 # Add inputs and outputs from these tool invocations to the build variables 
 C_SRCS += \
 ../system/src/davis_vantage/davis.c \
-../system/src/davis_vantage/davis_parsers.c 
+../system/src/davis_vantage/davis_parsers.c \
+../system/src/davis_vantage/sds011.c 
 
 OBJS += \
 ./system/src/davis_vantage/davis.o \
-./system/src/davis_vantage/davis_parsers.o 
+./system/src/davis_vantage/davis_parsers.o \
+./system/src/davis_vantage/sds011.o 
 
 C_DEPS += \
 ./system/src/davis_vantage/davis.d \
-./system/src/davis_vantage/davis_parsers.d 
+./system/src/davis_vantage/davis_parsers.d \
+./system/src/davis_vantage/sds011.d 
 
 
 # Each subdirectory must supply rules for building sources it contributes

src/config_data_default.c

@@ -73,6 +73,9 @@ const config_data_mode_t __attribute__((section(".config_section_default.mode"))
 		.wx_umb = 0,
 #endif
 
+#ifdef _DUST_SDS011_SERIAL
+		.wx_dust_sensor = WX_DUST_SDS011_SERIAL,
+#endif
 
 #ifdef _VICTRON
 		.victron = 1,

src/config_data_first.c

@@ -93,6 +93,10 @@ const config_data_mode_t __attribute__((section(".config_section_first.mode")))
 
 		.wx_anemometer_pulses_constant = _ANEMOMETER_PULSES_IN_10SEC_PER_ONE_MS_OF_WINDSPEED,
 
+#ifdef _DUST_SDS011_SERIAL
+		.wx_dust_sensor = WX_DUST_SDS011_SERIAL,
+#endif
+
 #ifdef _DIGI_ONLY_789
 		.digi_only_ssids = 1,
 #else

src/config_data_second.c

@@ -73,6 +73,9 @@ const config_data_mode_t __attribute__((section(".config_section_second.mode")))
 		.wx_umb = 0,
 #endif
 
+#ifdef _DUST_SDS011_SERIAL
+		.wx_dust_sensor = WX_DUST_SDS011_SERIAL,
+#endif
 
 #ifdef _VICTRON
 		.victron = 1,

src/main.c

@@ -68,6 +68,7 @@
 #include "drivers/dallas.h"
 #include "drivers/i2c.h"
 #include "drivers/analog_anemometer.h"
+#include "dust_sensor/sds011.h"
 #include "aprs/wx.h"
 
 #include "../system/include/modbus_rtu/rtu_serial_io.h"
@@ -1126,9 +1127,11 @@ int main(int argc, char* argv[]){
 			}
 #endif
 		}
-		else if ((main_config_data_mode & WX_DUST_SDS011_SERIAL) > 0) {
+		else if ((main_config_data_mode->wx_dust_sensor & WX_DUST_SDS011_SERIAL) > 0) {
 			if (main_kiss_srl_ctx_ptr->srl_rx_state == SRL_RX_DONE) {
 
+				sds011_get_pms(main_kiss_srl_ctx_ptr->srl_rx_buf_pointer, 10, &rte_wx_pm10, &rte_wx_pm2_5);
+
 				// restart reception
 				srl_receive_data(main_kiss_srl_ctx_ptr, 10, 0xAA, 0, 0, 0, 0);
 

system/src/davis_vantage/sds011.c

@@ -18,23 +18,28 @@ int sds011_get_pms(uint8_t * data, uint16_t data_ln, uint16_t * pm_10, uint16_t
 	// values received from sensor
 	uint8_t head = 			*(data + 0);
 	uint8_t command_id = 	*(data + 1);
-	uint8_t checksum = 		*(data + 9);
+	uint8_t checksum = 		*(data + 8);
 
-	// calculate checksum
+	if (command_id == 0xC0) {
-	for (int i = 2; i < 9; i++) {
+		// calculate checksum
-		local_checksum += *(data + i);
+		for (int i = 2; i < 8; i++) {
+			local_checksum += *(data + i);
+		}
+
+		if ((local_checksum & 0xFF) != checksum) {
+			return -2;
+		}
+
+		local_checksum = *(data + 2) | (*(data + 3) << 8);
+		*pm_2_5 = local_checksum;
+
+		local_checksum = *(data + 4) | (*(data + 5) << 8);
+		*pm_10 = local_checksum;
+
+		return 0;
 	}
-
+	else {
-	if ((local_checksum & 0xFF) != checksum) {
+		return -3;
-		return -2;
 	}
 
-	local_checksum = *(data + 1) | (*(data + 2) << 8);
-	*pm_2_5 = local_checksum;
-
-	local_checksum = *(data + 4) | (*(data + 5) << 8);
-	*pm_10 = local_checksum;
-
-	return 0;
-
 }