as7343: Fix channel and status order.

drivers/as7343/as7343.cpp

@@ -30,7 +30,7 @@ namespace pimoroni {
     i2c->set_bits(address, reg::FIFO_MAP, 0, FIFO_MAP_CH5 | FIFO_MAP_CH4 | FIFO_MAP_CH3 | FIFO_MAP_CH2 | FIFO_MAP_CH1 | FIFO_MAP_CH0 | FIFO_MAP_ASTATUS);
 
     // Set the PON bit
-    i2c->reg_write_uint8(address, reg::ENABLE, ENABLE_WEN | ENABLE_SMUXEN | ENABLE_SP_EN | ENABLE_PON);
+    i2c->reg_write_uint8(address, reg::ENABLE, ENABLE_WEN | ENABLE_SP_EN | ENABLE_PON);
 
     return true;
   }
@@ -135,10 +135,23 @@ namespace pimoroni {
     }
   }
 
+  void AS7343::start_measurement() {
+    if(running) return;
+    i2c->set_bits(address, reg::ENABLE, 0, ENABLE_SMUXEN);
+    running = true;
+  }
+
+  void AS7343::stop_measurement() {
+    i2c->set_bits(address, reg::ENABLE, 0, ENABLE_SMUXEN);
+    running = false;
+  }
+
   void AS7343::read_fifo(uint16_t *buf) {
     uint16_t expected_results = read_cycles * 7;
     uint16_t result_slot = 0;
 
+    start_measurement();
+
     while (i2c->reg_read_uint8(address, reg::FIFO_LVL) < expected_results) {
         sleep_ms(1);
     }

drivers/as7343/as7343.hpp

@@ -49,36 +49,68 @@ namespace pimoroni {
   public:
     struct reading {
         // Cycle 1
+        uint16_t c1_astatus = 0; // (c1_astatus >> 8) & 0b10001111
+                                 // 0b10000000 = saturated
+                                 // 0b00001111 = gain lowest nibble
         uint16_t FZ = 0;   // 428-480 nm
         uint16_t FY = 0;   // 534-593 nm
         uint16_t FXL = 0;  // 593-628 nm
         uint16_t NIR = 0;  // 849-903 nm
 
         uint16_t c1_vis_tl = 0;  // Visible top-left
         uint16_t c1_vis_br = 0;  // Visible bottom-right
-        uint16_t c1_astatus = 0; // (c1_astatus >> 8) & 0b10001111
-                                 // 0b10000000 = saturated
-                                 // 0b00001111 = gain lowest nibble
+        //uint16_t c1_fd = 0;    // This is where flicker detect *would* be
 
         // Cycle 2
+        uint16_t c2_astatus = 0;
         uint16_t F2 = 0;   // 408-448 nm
         uint16_t F3 = 0;   // 448-500 mn
         uint16_t F4 = 0;   // 500-534 nm
         uint16_t F6 = 0;   // 618-665 nm
 
         uint16_t c2_vis_tl = 0;
         uint16_t c2_vis_br = 0;
-        uint16_t c2_astatus = 0;
+        //uint16_t c2_fd = 0;
 
         // Cycle 3
+        uint16_t c3_astatus = 0;
         uint16_t F1 = 0;   // 396-408 nm
-        uint16_t F5 = 0;   // 531-594 nm
         uint16_t F7 = 0;   // 685-715 nm
         uint16_t F8 = 0;   // 715-766 nm
+        uint16_t F5 = 0;   // 531-594 nm
 
         uint16_t c3_vis_tl = 0;
         uint16_t c3_vis_br = 0;
-        uint16_t c3_astatus = 0;
+        //uint16_t c3_fd = 0;
+
+        float gain(uint8_t cycle) {
+          uint8_t status = 0;
+          switch(cycle) {
+            case 1:
+              status = c1_astatus & 0xf;
+              break;
+            case 2:
+              status = c2_astatus & 0xf;
+              break;
+            case 3:
+              status = c3_astatus & 0xf;
+              break;
+          }
+          return status ? 1 << (status - 1) : 0.5f;
+        }
+
+        bool saturated(uint8_t cycle) {
+          switch(cycle) {
+            case 1:
+              return c1_astatus & 0x80;
+            case 2:
+              return c2_astatus & 0x80;
+            case 3:
+              return c3_astatus & 0x80;
+            default:
+              return false;
+          }
+        }
     };
 
 
@@ -95,6 +127,8 @@ namespace pimoroni {
     uint8_t read_cycles = 1;
     uint8_t ch_count = (uint8_t)channel_count::SIX_CHANNEL;
 
+    bool running = false;
+
 
     //--------------------------------------------------
     // Constructors/Destructor
@@ -120,6 +154,9 @@ namespace pimoroni {
 
     void get_version(uint8_t &auxid, uint8_t &revid, uint8_t &hwid);
 
+    void start_measurement();
+    void stop_measurement();
+
     reading read();
 
     void read_fifo(uint16_t *buf);

examples/breakout_as7343/as7343_demo.cpp

@@ -62,6 +62,8 @@ int main() {
       reading.F8
     );
 
+    printf("Gain: C1: %fx C2: %fx C3: %fx\n", reading.gain(1), reading.gain(2), reading.gain(3));
+
     sleep_ms(1000);
   }