From fbd42865ef0e115f8371e6ab8189c6700e227e73 Mon Sep 17 00:00:00 2001
From: Sergio Gasquez Arcos <sergio.gasquez@gmail.com>
Date: Thu, 23 Jun 2022 19:10:57 +0200
Subject: [PATCH] Update MISO and CS pins to be optional (#89)

* Update CS and MISO pins to be optional
* Update examples
---
 esp-hal-common/src/spi.rs            | 20 ++++++++++++--------
 esp32-hal/examples/spi_loopback.rs   |  4 ++--
 esp32c3-hal/examples/spi_loopback.rs |  4 ++--
 esp32s2-hal/examples/spi_loopback.rs |  4 ++--
 esp32s3-hal/examples/spi_loopback.rs |  4 ++--
 5 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/esp-hal-common/src/spi.rs b/esp-hal-common/src/spi.rs
index 9e7e00024..7fe40cc62 100644
--- a/esp-hal-common/src/spi.rs
+++ b/esp-hal-common/src/spi.rs
@@ -13,8 +13,8 @@
 //!     peripherals.SPI2,
 //!     sclk,
 //!     mosi,
-//!     miso,
-//!     cs,
+//!     Some(miso),
+//!     Some(cs),
 //!     100u32.kHz(),
 //!     SpiMode::Mode0,
 //!     &mut peripheral_clock_control,
@@ -61,8 +61,8 @@ where
         spi: T,
         mut sck: SCK,
         mut mosi: MOSI,
-        mut miso: MISO,
-        mut cs: CS,
+        miso: Option<MISO>,
+        cs: Option<CS>,
         frequency: HertzU32,
         mode: SpiMode,
         peripheral_clock_control: &mut PeripheralClockControl,
@@ -74,11 +74,15 @@ where
         mosi.set_to_push_pull_output()
             .connect_peripheral_to_output(spi.mosi_signal());
 
-        miso.set_to_input()
-            .connect_input_to_peripheral(spi.miso_signal());
+        if let Some(mut miso) = miso {
+            miso.set_to_input()
+                .connect_input_to_peripheral(spi.miso_signal());
+        }
 
-        cs.set_to_push_pull_output()
-            .connect_peripheral_to_output(spi.cs_signal());
+        if let Some(mut cs) = cs {
+            cs.set_to_push_pull_output()
+                .connect_peripheral_to_output(spi.cs_signal());
+        }
 
         spi.enable_peripheral(peripheral_clock_control);
 
diff --git a/esp32-hal/examples/spi_loopback.rs b/esp32-hal/examples/spi_loopback.rs
index b415970ee..ebdf614e8 100644
--- a/esp32-hal/examples/spi_loopback.rs
+++ b/esp32-hal/examples/spi_loopback.rs
@@ -57,8 +57,8 @@ fn main() -> ! {
         peripherals.SPI2,
         sclk,
         mosi,
-        miso,
-        cs,
+        Some(miso),
+        Some(cs),
         100u32.kHz(),
         SpiMode::Mode0,
         &mut system.peripheral_clock_control,
diff --git a/esp32c3-hal/examples/spi_loopback.rs b/esp32c3-hal/examples/spi_loopback.rs
index 3dd979260..1272fb6d4 100644
--- a/esp32c3-hal/examples/spi_loopback.rs
+++ b/esp32c3-hal/examples/spi_loopback.rs
@@ -60,8 +60,8 @@ fn main() -> ! {
         peripherals.SPI2,
         sclk,
         mosi,
-        miso,
-        cs,
+        Some(miso),
+        Some(cs),
         100u32.kHz(),
         SpiMode::Mode0,
         &mut system.peripheral_clock_control,
diff --git a/esp32s2-hal/examples/spi_loopback.rs b/esp32s2-hal/examples/spi_loopback.rs
index 4d6126470..e55f19b35 100644
--- a/esp32s2-hal/examples/spi_loopback.rs
+++ b/esp32s2-hal/examples/spi_loopback.rs
@@ -57,8 +57,8 @@ fn main() -> ! {
         peripherals.SPI2,
         sclk,
         mosi,
-        miso,
-        cs,
+        Some(miso),
+        Some(cs),
         100u32.kHz(),
         SpiMode::Mode0,
         &mut system.peripheral_clock_control,
diff --git a/esp32s3-hal/examples/spi_loopback.rs b/esp32s3-hal/examples/spi_loopback.rs
index 8d12c9ee2..b48920aff 100644
--- a/esp32s3-hal/examples/spi_loopback.rs
+++ b/esp32s3-hal/examples/spi_loopback.rs
@@ -57,8 +57,8 @@ fn main() -> ! {
         peripherals.SPI2,
         sclk,
         mosi,
-        miso,
-        cs,
+        Some(miso),
+        Some(cs),
         100u32.kHz(),
         SpiMode::Mode0,
         &mut system.peripheral_clock_control,