LVSS current sensing

CMakeLists.txt

@@ -63,7 +63,7 @@ add_library(${PROJECT_NAME} STATIC
 # Add sources
 target_sources(${PROJECT_NAME} PRIVATE
         src/LVSS.cpp
-        src/dev/INA138.cpp
+        src/dev/ACS71240.cpp
         )
 
 ###############################################################################

include/LVSS.hpp

@@ -7,7 +7,7 @@
 #include <EVT/io/SPI.hpp>
 #include <EVT/utils/log.hpp>
 #include <LVSS.hpp>
-#include <dev/INA138.hpp>
+#include <dev/ACS71240.hpp>
 
 namespace IO = EVT::core::IO;
 namespace DEV = EVT::core::DEV;

include/dev/INA138.hpp → include/dev/ACS71240.hpp

@@ -1,5 +1,5 @@
-#ifndef LVSS_INA138_HPP
-#define LVSS_INA138_HPP
+#ifndef LVSS_ACS71240_HPP
+#define LVSS_ACS71240_HPP
 
 #include <EVT/io/ADC.hpp>
 #include <EVT/utils/log.hpp>
@@ -13,29 +13,25 @@ namespace LVSS {
 /**
  * Class for LVSS current sensor
  */
-class INA138 {
+class ACS71240 {
 public:
     /**
      * Constructor for current sensing class
      */
-    INA138(IO::ADC& adc0);
+    ACS71240(IO::ADC& adc0);
 
     /**
-      * Get the current detected by the INA
+      * Get the current detected by the ACS71240
       *
       * @return The current
       */
-    uint32_t readCurrent();
+    int32_t readCurrent();
+    uint32_t readCounts();
 
 private:
     /** ADC instance for getting input voltage */
     IO::ADC& ADC;
 
-    /** Read INA138 datasheet page 3 */
-    /** Resistor variables */
-    static constexpr uint32_t rShunt = 0.05 * 100;//0.05 ohm resistor
-    static constexpr uint32_t r1 = 5000;          //5k ohm
-    static constexpr uint32_t r3 = 50000;         //50k ohm
 };
 
 }// namespace LVSS

src/dev/ACS71240.cpp

@@ -0,0 +1,21 @@
+#include <dev/ACS71240.hpp>
+
+namespace LVSS {
+
+ACS71240::ACS71240(IO::ADC& adc0) : ADC(adc0) {}
+
+int32_t ACS71240::readCurrent() {
+    //Gets adcCounts from adc
+    int32_t adcCounts = ADC.readRaw();
+
+    int32_t current = (((adcCounts-1970) * 3300) / 180);
+
+    return current;
+}
+
+uint32_t ACS71240::readCounts() {
+    uint32_t adcCounts = ADC.readRaw();
+    return adcCounts;
+}
+
+}// namespace LVSS

targets/CMakeLists.txt

@@ -1,2 +1,3 @@
 # Add all targets
 add_subdirectory(REV3-LVSS)
+add_subdirectory(REV3-ACS71240)

targets/REV3-ACS71240/CMakeLists.txt

@@ -0,0 +1,7 @@
+include(${EVT_CORE_DIR}/cmake/evt-core_build.cmake)
+
+project(REV3-ACS71240)
+cmake_minimum_required(VERSION 3.15)
+
+make_exe(${PROJECT_NAME} main.cpp)
+target_link_libraries(${PROJECT_NAME} PUBLIC ${BOARD_LIB_NAME})

targets/REV3-INA138/INA138_main.cpp → targets/REV3-ACS71240/main.cpp

@@ -1,6 +1,6 @@
 /**
  * This is a basic sample to show how the current sensing feature of the
- * LVSS using the INA138 IC
+ * LVSS using the ACS71240 IC
  */
 
 #include <EVT/io/UART.hpp>
@@ -25,12 +25,14 @@ int main() {
     log::LOGGER.setLogLevel(log::Logger::LogLevel::INFO);
 
     //ADC
-    IO::ADC& adc0 = IO::getADC<IO::Pin::PA_1>();
+    IO::ADC& adc0 = IO::getADC<IO::Pin::A1>();
 
-    LVSS::INA138 ina138(adc0);
+    //Create ACS71240 instance
+    LVSS::ACS71240 acs71240(adc0);
 
     while (1) {
-        uart.printf("ADC0: %d\r\n mA", ina138.readCurrent());
-        time::wait(500);
+        uart.printf("ADC0: %dmA\r\n", acs71240.readCurrent());
+        uart.printf("Counts: %d\r\n", acs71240.readCounts());
+        time::wait(1000);
     }
-}
+}