WIP sketch out init sequence

1 files changed, 63 insertions, 0 deletions

diff --git a/main/display.cpp b/main/display.cpp
new file mode 100644
index 00000000..551400bd
--- /dev/null
+++ b/main/display.cpp
@@ -0,0 +1,63 @@
+#include "display.hpp"
+#include <cstdint>
+#include "driver/gpio.h"
+#include "driver/spi_master.h"
+#include "hal/gpio_types.h"
+#include "hal/spi_types.h"
+
+namespace gay_ipod {
+
+static const gpio_num_t kCommandOrDataPin = GPIO_NUM_21;
+static const gpio_num_t kLedPin = GPIO_NUM_22;
+
+static const uint8_t kDisplayWidth = 128;
+static const uint8_t kDisplayHeight = 160;
+
+auto Display::create(GpioExpander* expander)
+    -> cpp::result<std::unique_ptr<Display>, Error> {
+  // First, set up our GPIOs
+#define SPI_QUADWP_IO (GPIO_NUM_22)
+#define SPI_QUADHD_IO (GPIO_NUM_21)
+  gpio_config_t gpio_cfg = {
+    .intr_type = GPIO_INTR_DISABLE,
+    .mode = GPIO_MODE_OUTPUT,
+    .pin_bit_mask = (1 << GPIO_OUTPUT_22) | (1 << GPIO_OUTPUT_21),
+    .pull_down_en = 0,
+    .pull_up_en = 0,
+  }
+  gpio_config(&gpio_cfg);
+
+  gpio_set_level(kLedPin, 1);
+  gpio_set_level(kCommandOrDataPin, 1);
+
+  // Next, init the SPI device
+  auto lock = expander->AcquireSpiBus(GpioExpander::DISPLAY);
+  spi_device_interface_config_t spi_cfg = {
+    .command_bits = 0, // Unused
+    .address_bits = 0, // Unused
+    .dummy_bits = 0,
+    .mode = 0,
+    .duty_cycle_pos = 0, // Unused
+    .cs_ena_pretrans = 0,
+    .cs_ena_posttrans = 0,
+    .clock_speed_hz = 32000000,
+    .input_delay_ns = 0,
+    .spics_io_num = -1,
+    .flags = 0,
+    .queue_size = 0,
+    .pre_cb = NULL,
+    .post_cb = NULL,
+  };
+  spi_device_handle_t handle;
+  spi_bus_add_device(VSPI_HOST, &spi_cfg, &handle);
+
+  // Now we reset the display into a known state, then configure it
+  // https://github.com/adafruit/Adafruit-ST7735-Library/blob/master/Adafruit_ST77xx.cpp
+  // https://github.com/adafruit/Adafruit-ST7735-Library/blob/master/Adafruit_ST7735.cpp
+  // commonInit with Rcmd1
+  // displayInit with Rcmd2green
+  // displayInit with Rcmd3
+  // setRotation
+}
+
+} // namespace gay_ipod