1 files changed, 167 insertions, 4 deletions
diff --git a/src/drivers/st7789.cpp b/src/drivers/st7789.cpp
index 6e2fb68..a4d0626 100644
--- a/src/drivers/st7789.cpp
+++ b/src/drivers/st7789.cpp
@@ -1,5 +1,168 @@
-//
-// Created by jf on 12/2/19.
-//
-
+#include <hal/nrf_gpio.h>
+#include <libraries/delay/nrf_delay.h>
 #include "st7789.h"
+#include "spi_master_fast.h"
+
+using namespace Pinetime::Drivers;
+
+ret_code_t st7789::Init() {
+  InitHw();
+  InitCommands();
+
+}
+
+ret_code_t st7789::InitHw() const {
+  nrf_gpio_cfg_output(ST7735_DC_PIN);
+  SPI_config_t spi_config;
+
+  spi_config.pin_SCK                 = ST7735_SCK_PIN;
+  spi_config.pin_MOSI                 = ST7735_MOSI_PIN;
+  spi_config.pin_MISO                 = ST7735_MISO_PIN;
+  spi_config.pin_CSN                 = ST7735_SS_PIN;
+  spi_config.frequency                 = SPI_FREQ_8MBPS;
+  spi_config.config.fields.mode                 = SPI_MODE3;
+  spi_config.config.fields.bit_order                 = SPI_BITORDER_MSB_LSB;
+
+
+  spi_master_init(SPI0, &spi_config);
+
+  return 0;
+}
+
+void st7789::InitCommands() {
+  SoftwareReset();
+  SleepOut();
+  ColMod();
+  MemoryDataAccessControl();
+  ColumnAddressSet();
+  RowAddressSet();
+  DisplayInversionOn();
+  NormalModeOn();
+  DisplayOn();
+
+}
+
+void st7789::WriteCommand(uint8_t cmd) {
+  nrf_gpio_pin_clear(ST7735_DC_PIN);
+  WriteSpi(&cmd, 1);
+}
+
+void st7789::WriteData(uint8_t data) {
+  nrf_gpio_pin_set(ST7735_DC_PIN);
+  WriteSpi(&data, 1);
+}
+
+
+void st7789::WriteSpi(const uint8_t* data, size_t size) {
+//  APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, data, size, nullptr, 0));
+  spi_master_tx(SPI0, size, data);
+}
+
+void st7789::SoftwareReset() {
+  WriteCommand(static_cast<uint8_t>(Commands::SoftwareReset));
+  nrf_delay_ms(150);
+}
+
+void st7789::SleepOut() {
+  WriteCommand(static_cast<uint8_t>(Commands::SleepOut));
+  nrf_delay_ms(500);
+}
+
+void st7789::ColMod() {
+  WriteCommand(static_cast<uint8_t>(Commands::ColMod));
+  WriteData(0x55);
+  nrf_delay_ms(10);
+}
+
+void st7789::MemoryDataAccessControl() {
+  WriteCommand(static_cast<uint8_t>(Commands::MemoryDataAccessControl));
+  WriteData(0x00);
+}
+
+void st7789::ColumnAddressSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
+  WriteData(0x00);
+  WriteData(0x00);
+  WriteData(Height >> 8);
+  WriteData(Height & 0xff);
+}
+
+void st7789::RowAddressSet() {
+  WriteCommand(static_cast<uint8_t>(Commands::RowAddressSet));
+  WriteData(0x00);
+  WriteData(0x00);
+  WriteData(Width >> 8);
+  WriteData(Width & 0xff);
+}
+
+void st7789::DisplayInversionOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::DisplayInversionOn));
+  nrf_delay_ms(10);
+}
+
+void st7789::NormalModeOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::NormalModeOn));
+  nrf_delay_ms(10);
+}
+
+void st7789::DisplayOn() {
+  WriteCommand(static_cast<uint8_t>(Commands::DisplayOn));
+  nrf_delay_ms(500);
+}
+
+void st7789::FillRectangle(uint16_t x, uint16_t y, uint16_t width, uint16_t height, uint16_t color) {
+  // rudimentary clipping (drawChar w/big text requires this)
+  if((x >= Width) || (y >= Height)) return;
+  if((x + width - 1) >= Width)  width = Width  - x;
+  if((y + height - 1) >= Height) height = Height - y;
+
+  SetAddrWindow(0+x, ST7789_ROW_OFFSET+y, x+width-1, y+height-1);
+
+  uint8_t hi = color >> 8, lo = color;
+  uint32_t c = color + (color << 16);
+
+  nrf_gpio_pin_set(ST7735_DC_PIN);
+  for(y=height+ST7789_ROW_OFFSET; y>ST7789_ROW_OFFSET; y--) {
+    for(x=width; x>0; x--) {
+      WriteSpi(reinterpret_cast<const uint8_t *>(&c), 4);
+    }
+  }
+}
+
+void st7789::SetAddrWindow(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1) {
+  WriteCommand(static_cast<uint8_t>(Commands::ColumnAddressSet));
+  WriteData(x0 >> 8);
+  WriteData(x0 & 0xff);
+  WriteData(x1 >> 8);
+  WriteData(x1 & 0xff);
+
+  WriteCommand(static_cast<uint8_t>(Commands::RowAddressSet));
+  WriteData(y0>>8);
+  WriteData(y0 & 0xff);
+  WriteData(y1 >> 8);
+  WriteData(y1 & 0xff);
+
+  WriteToRam();
+}
+
+void st7789::WriteToRam() {
+  WriteCommand(static_cast<uint8_t>(Commands::WriteToRam));
+}
+
+void st7789::DisplayOff() {
+  WriteCommand(static_cast<uint8_t>(Commands::DisplayOff));
+  nrf_delay_ms(500);
+}
+
+void st7789::Uninit() {
+
+}
+
+void st7789::DrawPixel(uint16_t x, uint16_t y, uint32_t color) {
+  if((x < 0) ||(x >= Width) || (y < 0) || (y >= Height)) return;
+
+  SetAddrWindow(x, y, x+1, y+1);
+
+  nrf_gpio_pin_set(ST7735_DC_PIN);
+  WriteSpi(reinterpret_cast<const uint8_t *>(&color), 2);
+}