FIFO is always 10-bit

README.md

@@ -49,6 +49,10 @@ x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
 x: 0.5480, y: -0.8800, z: -0.0800 mag: 1.0398
 x: 0.5480, y: -0.8960, z: -0.0960 mag: 1.0547
 ```
+
+> ### Notes
+> FIFO is always and only 10-bit
+
 ### Noise at 2G
 ![DC noise at 2G](.gitea/graph-2g.png)
 

lis3dh.c

@@ -294,8 +294,19 @@ int lis3dh_read_fifo(lis3dh_t *lis3dh, struct lis3dh_fifo_data *fifo) {
     int err = 0;
     int i, idx;
 
-    scale = acc_shift(lis3dh);
+    /* FIFO is always 10-bit */
-    sens = acc_sensitivity(lis3dh);
+    scale = 6;
+
+    /* normal mode */
+    if (lis3dh->cfg.range == LIS3DH_FS_2G) {
+        sens = 4;
+    } else if (lis3dh->cfg.range == LIS3DH_FS_4G) {
+        sens = 8;
+    } else if (lis3dh->cfg.range == LIS3DH_FS_8G) {
+        sens = 16;
+    } else { /* 16G */
+        sens = 48;
+    }
 
     /* fifo buffer is max 32 */
     fifo->size = lis3dh->cfg.fifo.fth > 32 ? 32 : lis3dh->cfg.fifo.fth;

plot.gp

@@ -7,20 +7,17 @@ set key box opaque
 
 set ylabel "|[x y z]| - 1g"
 set xlabel "Samples over time"
-set yrange [-0.2:0.2]
+set yrange [-0.3:0.1]
 
 n(g) = g - 1.0
 
 do for [g in "2g 4g 8g 16g"] {
     name = sprintf("graph-%s", g)
     out = sprintf("%s.png", name)
-    stub = sprintf("data/hr_%s_", g)
+    stub = sprintf("data/fifo_%s_", g)
-    set title sprintf("[%s + HR] comparison of ODR setting effect on magnitude of [x y z] acc vector (- 1g)", g)
+    set title sprintf("[%s FIFO] comparison of ODR setting effect on magnitude of [x y z] acc vector (- 1g)", g)
     set output out
-    plot stub."1.txt" u n(4) w p ps 0.3 t "1 Hz", \
+    plot stub."50.txt" u n(4) w p ps 0.3 t "50 Hz", \
-         stub."10.txt" u n(4) w p ps 0.3 t "10 Hz", \
-         stub."25.txt" u n(4) w p ps 0.3 t "25 Hz", \
-         stub."50.txt" u n(4) w p ps 0.3 t "50 Hz", \
          stub."100.txt" u n(4) w p ps 0.3 t "100 Hz", \
          stub."200.txt" u n(4) w p ps 0.3 t "200 Hz", \
          stub."400.txt" u n(4) w p ps 0.3 t "400 Hz", \