From 6efa5cfb3fd013defbfd293b2fc2b3bacb8b5348 Mon Sep 17 00:00:00 2001
From: Phil Howard <github@gadgetoid.com>
Date: Thu, 17 Apr 2025 20:01:20 +0100
Subject: [PATCH] Inky73: Use a GPIO for busy wait.

---
 drivers/inky73/inky73.cpp | 17 ++++++++++++++---
 drivers/inky73/inky73.hpp |  3 ++-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/inky73/inky73.cpp b/drivers/inky73/inky73.cpp
index aca9048d..f2991c64 100644
--- a/drivers/inky73/inky73.cpp
+++ b/drivers/inky73/inky73.cpp
@@ -44,7 +44,7 @@ namespace pimoroni {
   };
 
   bool Inky73::is_busy() {
-    return !(sr.read() & 128);
+    return !gpio_get(BUSY);
   }
   
   void Inky73::busy_wait(uint timeout_ms) {
@@ -75,6 +75,10 @@ namespace pimoroni {
     gpio_set_dir(RESET, GPIO_OUT);
     gpio_put(RESET, 1);
 
+    gpio_set_function(BUSY, GPIO_FUNC_SIO);
+    gpio_set_dir(BUSY, GPIO_IN);
+    gpio_set_pulls(BUSY, true, false);
+
     gpio_set_function(SCK,  GPIO_FUNC_SPI);
     gpio_set_function(MOSI, GPIO_FUNC_SPI);
   };
@@ -164,6 +168,12 @@ namespace pimoroni {
       gpio_put(CS, 0);
       spi_write_blocking(spi, (const uint8_t*)graphics->frame_buffer, graphics->bounds.w * graphics->bounds.h / 2);
       gpio_put(CS, 1);
+    } else if (graphics->pen_type == PicoGraphics::PEN_3BIT) {
+      graphics->frame_convert(PicoGraphics::PEN_P4, [this](void *buf, size_t length) {
+        if (length > 0) {
+          spi_write_blocking(spi, (const uint8_t*)buf, length);
+        }
+      });
     } else {
       graphics->frame_convert(PicoGraphics::PEN_INKY7, [this, &totalLength](void *buf, size_t length) {
         if (length > 0) {
@@ -175,7 +185,7 @@ namespace pimoroni {
       });
     }
 
-    gpio_put(DC, 0); // data mode
+    gpio_put(DC, 0); // command mode
 
     gpio_put(CS, 1);
 
@@ -194,7 +204,8 @@ namespace pimoroni {
   }
 
   bool Inky73::is_pressed(Button button) {
-    return sr.read() & button;
+    //return sr.read() & button;
+    return false;
   }
 
 }
diff --git a/drivers/inky73/inky73.hpp b/drivers/inky73/inky73.hpp
index bed9ee75..868182bb 100644
--- a/drivers/inky73/inky73.hpp
+++ b/drivers/inky73/inky73.hpp
@@ -25,6 +25,7 @@ namespace pimoroni {
     uint SCK    = SPI_DEFAULT_SCK;
     uint MOSI   = SPI_DEFAULT_MOSI;
     uint RESET  = 27; //25;
+    uint BUSY   = 6;
 
     uint SR_CLOCK = 8;
     uint SR_LATCH = 9;
@@ -32,7 +33,7 @@ namespace pimoroni {
 
     bool blocking = false;
 
-    ShiftRegister<uint8_t> sr = ShiftRegister<uint8_t>(SR_CLOCK, SR_LATCH, SR_DATA);
+    //ShiftRegister<uint8_t> sr = ShiftRegister<uint8_t>(SR_CLOCK, SR_LATCH, SR_DATA);
 
   public:
     enum Button : uint8_t {