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// Copyright 2022 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include <cstdint>
#include "app_common/common.h"
#define LIB_CMSIS_CORE 0
#define LIB_PICO_STDIO_SEMIHOSTING 0
#include "hardware/gpio.h"
#include "hardware/pwm.h"
#include "pico/stdlib.h"
#include "pw_digital_io_pico/digital_io.h"
#include "pw_log/log.h"
#include "pw_spi_pico/chip_selector.h"
#include "pw_spi_pico/initiator.h"
#include "pw_sync/borrow.h"
#include "pw_sync/mutex.h"
#if defined(DISPLAY_TYPE_ILI9341)
#include "pw_display_driver_ili9341/display_driver.h"
using DisplayDriver = pw::display_driver::DisplayDriverILI9341;
#elif defined(DISPLAY_TYPE_ST7735)
#include "pw_display_driver_st7735/display_driver.h"
using DisplayDriver = pw::display_driver::DisplayDriverST7735;
#elif defined(DISPLAY_TYPE_ST7789)
#include "pw_display_driver_st7789/display_driver.h"
using DisplayDriver = pw::display_driver::DisplayDriverST7789;
#else
#error "Undefined display type"
#endif
using pw::Status;
using pw::digital_io::PicoDigitalOut;
using pw::display::Display;
using pw::framebuffer::FramebufferRgb565;
using pw::spi::Device;
using pw::spi::Initiator;
using pw::spi::PicoChipSelector;
using pw::spi::PicoInitiator;
using pw::sync::Borrowable;
using pw::sync::VirtualMutex;
namespace {
// Pico spi0 Pins
#define SPI_PORT spi0
struct SpiValues {
SpiValues(pw::spi::Config config,
pw::spi::ChipSelector& selector,
pw::sync::VirtualMutex& initiator_mutex);
pw::spi::PicoInitiator initiator;
pw::sync::Borrowable<pw::spi::Initiator> borrowable_initiator;
pw::spi::Device device;
};
constexpr int kDisplayScaleFactor = 1;
constexpr int kFramebufferWidth = LCD_WIDTH / kDisplayScaleFactor;
constexpr int kFramebufferHeight = LCD_HEIGHT / kDisplayScaleFactor;
constexpr int kNumPixels = kFramebufferWidth * kFramebufferHeight;
constexpr int FramebufferRowBytes = sizeof(uint16_t) * kFramebufferWidth;
constexpr uint32_t kBaudRate = 31'250'000;
constexpr pw::spi::Config kSpiConfig8Bit{
.polarity = pw::spi::ClockPolarity::kActiveHigh,
.phase = pw::spi::ClockPhase::kFallingEdge,
.bits_per_word = pw::spi::BitsPerWord(8),
.bit_order = pw::spi::BitOrder::kMsbFirst,
};
constexpr pw::spi::Config kSpiConfig16Bit{
.polarity = pw::spi::ClockPolarity::kActiveHigh,
.phase = pw::spi::ClockPhase::kFallingEdge,
.bits_per_word = pw::spi::BitsPerWord(16),
.bit_order = pw::spi::BitOrder::kMsbFirst,
};
PicoDigitalOut s_display_dc_pin(TFT_DC);
#if TFT_RST != -1
PicoDigitalOut s_display_reset_pin(TFT_RST);
#endif
PicoDigitalOut s_display_cs_pin(TFT_CS);
PicoChipSelector s_spi_chip_selector(s_display_cs_pin);
PicoInitiator s_spi_initiator(SPI_PORT);
VirtualMutex s_spi_initiator_mutex;
Borrowable<Initiator> s_borrowable_spi_initiator(s_spi_initiator,
s_spi_initiator_mutex);
SpiValues s_spi_8_bit(kSpiConfig8Bit,
s_spi_chip_selector,
s_spi_initiator_mutex);
SpiValues s_spi_16_bit(kSpiConfig16Bit,
s_spi_chip_selector,
s_spi_initiator_mutex);
DisplayDriver s_display_driver({
.data_cmd_gpio = s_display_dc_pin,
#if TFT_RST != -1
.reset_gpio = &s_display_reset_pin,
#else
.reset_gpio = nullptr,
#endif
.spi_device_8_bit = s_spi_8_bit.device,
.spi_device_16_bit = s_spi_16_bit.device,
});
uint16_t pixel_data[kNumPixels];
Display s_display(FramebufferRgb565(pixel_data,
kFramebufferWidth,
kFramebufferHeight,
FramebufferRowBytes),
s_display_driver);
#if TFT_BL != -1
void SetBacklight(uint16_t brightness) {
pwm_config cfg = pwm_get_default_config();
pwm_set_wrap(pwm_gpio_to_slice_num(TFT_BL), 65535);
pwm_init(pwm_gpio_to_slice_num(TFT_BL), &cfg, true);
gpio_set_function(TFT_BL, GPIO_FUNC_PWM);
pwm_set_gpio_level(TFT_BL, brightness);
}
#endif
SpiValues::SpiValues(pw::spi::Config config,
pw::spi::ChipSelector& selector,
pw::sync::VirtualMutex& initiator_mutex)
: initiator(SPI_PORT),
borrowable_initiator(initiator, initiator_mutex),
device(borrowable_initiator, config, selector) {}
} // namespace
// static
Status Common::Init() {
// Initialize all of the present standard stdio types that are linked into the
// binary.
stdio_init_all();
// Set up the default UART and assign it to the default GPIO's.
setup_default_uart();
s_display_cs_pin.Enable();
s_display_dc_pin.Enable();
#if TFT_RST != -1
s_display_reset_pin.Enable();
#endif
#if TFT_BL != -1
SetBacklight(0xffff); // Full brightness.
#endif
unsigned actual_baudrate = spi_init(SPI_PORT, kBaudRate);
PW_LOG_DEBUG("Actual Baudrate: %u", actual_baudrate);
#if TFT_MISO != -1
gpio_set_function(TFT_MISO, GPIO_FUNC_SPI);
#endif
gpio_set_function(TFT_SCLK, GPIO_FUNC_SPI);
gpio_set_function(TFT_MOSI, GPIO_FUNC_SPI);
PW_TRY(s_display_driver.Init());
return s_display.Init();
}
// static
pw::display::Display& Common::GetDisplay() { return s_display; }