From b5b203697104241e2e8d58ad80d6be4e56d7cab0 Mon Sep 17 00:00:00 2001
From: SenexCrenshaw <35600301+SenexCrenshaw@users.noreply.github.com>
Date: Wed, 17 Mar 2021 20:59:47 -0400
Subject: [PATCH] 8266 hardware spi enable with just 3 pins (#1617)

---
 esphome/components/spi/spi.cpp |  2 +-
 esphome/components/spi/spi.h   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/esphome/components/spi/spi.cpp b/esphome/components/spi/spi.cpp
index ea6f8d68f6..d2850b8e7d 100644
--- a/esphome/components/spi/spi.cpp
+++ b/esphome/components/spi/spi.cpp
@@ -38,7 +38,7 @@ void SPIComponent::setup() {
 #ifdef ARDUINO_ARCH_ESP8266
   if (clk_pin == 6 && miso_pin == 7 && mosi_pin == 8) {
     // pass
-  } else if (clk_pin == 14 && miso_pin == 12 && mosi_pin == 13) {
+  } else if (clk_pin == 14 && (!has_miso || miso_pin == 12) && (!has_mosi || mosi_pin == 13)) {
     // pass
   } else {
     use_hw_spi = false;
diff --git a/esphome/components/spi/spi.h b/esphome/components/spi/spi.h
index 05c64150cc..a4a2e11def 100644
--- a/esphome/components/spi/spi.h
+++ b/esphome/components/spi/spi.h
@@ -98,6 +98,30 @@ class SPIComponent : public Component {
     this->transfer_<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE, false, true>(data);
   }
 
+  template<SPIBitOrder BIT_ORDER, SPIClockPolarity CLOCK_POLARITY, SPIClockPhase CLOCK_PHASE>
+  void write_byte16(const uint16_t data) {
+    if (this->hw_spi_ != nullptr) {
+      this->hw_spi_->write16(data);
+      return;
+    }
+
+    this->write_byte<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data >> 8);
+    this->write_byte<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data);
+  }
+
+  template<SPIBitOrder BIT_ORDER, SPIClockPolarity CLOCK_POLARITY, SPIClockPhase CLOCK_PHASE>
+  void write_array16(const uint16_t *data, size_t length) {
+    if (this->hw_spi_ != nullptr) {
+      for (size_t i = 0; i < length; i++) {
+        this->hw_spi_->write16(data[i]);
+      }
+      return;
+    }
+    for (size_t i = 0; i < length; i++) {
+      this->write_byte16<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data[i]);
+    }
+  }
+
   template<SPIBitOrder BIT_ORDER, SPIClockPolarity CLOCK_POLARITY, SPIClockPhase CLOCK_PHASE>
   void write_array(const uint8_t *data, size_t length) {
     if (this->hw_spi_ != nullptr) {
@@ -222,6 +246,14 @@ class SPIDevice {
     return this->parent_->template write_byte<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data);
   }
 
+  void write_byte16(uint8_t data) {
+    return this->parent_->template write_byte16<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data);
+  }
+
+  void write_array16(const uint16_t *data, size_t length) {
+    this->parent_->template write_array16<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data, length);
+  }
+
   void write_array(const uint8_t *data, size_t length) {
     this->parent_->template write_array<BIT_ORDER, CLOCK_POLARITY, CLOCK_PHASE>(data, length);
   }