feat(core/prodtest): Update haptic-test command with optional amplitude parameter.

diff --git a/core/embed/projects/prodtest/README.md b/core/embed/projects/prodtest/README.md
index c7da4811..1395e051 100644
--- a/core/embed/projects/prodtest/README.md
+++ b/core/embed/projects/prodtest/README.md
@@ -374,14 +374,14 @@ OK 2F0079001951354861125762
 ```
 
 ### haptic-test
-Test the functionality of the device's haptic actuator. It takes one input parameter, representing the duration of the vibration in milliseconds.
+Test the functionality of the device's haptic actuator. It takes one mandatory input parameter, representing the duration of the vibration in milliseconds and second optional parameter setting the vibration amplitude
 
 The device only vibrates if there is motor connected to the haptic driver, otherwise the effect needs to be measured by an oscilloscope.
 
 Example (runs the driver for 3s):
 ```
-haptic-test 3000
-# Running haptic feedback test for 3000 ms...
+haptic-test 3000 50
+# Running haptic feedback test for 3000 ms with amplitude 50 ...
 OK
 ```
 
diff --git a/core/embed/projects/prodtest/cmd/prodtest_haptic.c b/core/embed/projects/prodtest/cmd/prodtest_haptic.c
index 503b6d6f..d3f71722 100644
--- a/core/embed/projects/prodtest/cmd/prodtest_haptic.c
+++ b/core/embed/projects/prodtest/cmd/prodtest_haptic.c
@@ -26,6 +26,7 @@
 
 static void prodtest_haptic_test(cli_t* cli) {
   uint32_t duration_ms = 0;  // ms
+  uint32_t amplitude = 100;  // default amplitude
 
   ts_t status;
 
@@ -34,7 +35,14 @@ static void prodtest_haptic_test(cli_t* cli) {
     return;
   }
 
-  if (cli_arg_count(cli) > 1) {
+  if (cli_arg_count(cli) == 2) {
+    if (!cli_arg_uint32(cli, "amplitude", &amplitude) || amplitude > 100) {
+      cli_error_arg(cli, "Expecting amplitude value in range 0-100.");
+      return;
+    }
+  }
+
+  if (cli_arg_count(cli) > 3) {
     cli_error_arg_count(cli);
     return;
   }
@@ -45,9 +53,10 @@ static void prodtest_haptic_test(cli_t* cli) {
     return;
   }
 
-  cli_trace(cli, "Running haptic feedback test for %d ms...", duration_ms);
+  cli_trace(cli, "Running haptic feedback test for %d ms with amplitude %d ...",
+            duration_ms, amplitude);
 
-  status = haptic_play_custom(100, duration_ms);
+  status = haptic_play_custom(amplitude, duration_ms);
   if (ts_error(status)) {
     cli_error(cli, CLI_ERROR, "Haptic feedback test failed.");
     return;
@@ -62,7 +71,7 @@ PRODTEST_CLI_CMD(
   .name = "haptic-test",
   .func = prodtest_haptic_test,
   .info = "Test the haptic feedback actuator",
-  .args = "<duration>"
+  .args = "<duration>[<amplitude>]"
 );
 
 #endif  // USE_HAPTIC