From 4f2e2fa297070e4d7f55a37175359f4d8f74c0f0 Mon Sep 17 00:00:00 2001
From: buxtronix <bbuxton@gmail.com>
Date: Sat, 2 May 2020 09:05:09 +1000
Subject: [PATCH] Some max7219 updates. (#1021)

* Some max7219 updates. Disable test mode on startup and allow dynamic brightness

* fix formatting
---
 esphome/components/max7219/max7219.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/esphome/components/max7219/max7219.cpp b/esphome/components/max7219/max7219.cpp
index 6616da1a58..99eca6c14f 100644
--- a/esphome/components/max7219/max7219.cpp
+++ b/esphome/components/max7219/max7219.cpp
@@ -12,6 +12,7 @@ static const uint8_t MAX7219_REGISTER_DECODE_MODE = 0x09;
 static const uint8_t MAX7219_REGISTER_INTENSITY = 0x0A;
 static const uint8_t MAX7219_REGISTER_SCAN_LIMIT = 0x0B;
 static const uint8_t MAX7219_REGISTER_SHUTDOWN = 0x0C;
+static const uint8_t MAX7219_REGISTER_TEST = 0x0F;
 static const uint8_t MAX7219_UNKNOWN_CHAR = 0b11111111;
 
 const uint8_t MAX7219_ASCII_TO_RAW[95] PROGMEM = {
@@ -127,6 +128,7 @@ void MAX7219Component::setup() {
   this->send_to_all_(MAX7219_REGISTER_INTENSITY, this->intensity_);
   this->display();
   // power up
+  this->send_to_all_(MAX7219_REGISTER_TEST, 0);
   this->send_to_all_(MAX7219_REGISTER_SHUTDOWN, 1);
 }
 void MAX7219Component::dump_config() {
@@ -210,7 +212,10 @@ uint8_t MAX7219Component::printf(const char *format, ...) {
   return 0;
 }
 void MAX7219Component::set_writer(max7219_writer_t &&writer) { this->writer_ = writer; }
-void MAX7219Component::set_intensity(uint8_t intensity) { this->intensity_ = intensity; }
+void MAX7219Component::set_intensity(uint8_t intensity) {
+  this->intensity_ = intensity;
+  this->send_to_all_(MAX7219_REGISTER_INTENSITY, this->intensity_);
+}
 void MAX7219Component::set_num_chips(uint8_t num_chips) { this->num_chips_ = num_chips; }
 
 #ifdef USE_TIME