Ken Van Hoeylandt
191 lines
6.9 KiB
C++
191 lines
6.9 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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#include <soc/soc_caps.h>
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#if SOC_LCD_I80_SUPPORTED
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#include <tactility/device.h>
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#include <tactility/drivers/esp32_i8080.h>
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#include <tactility/log.h>
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#include "tactility/drivers/gpio_descriptor.h"
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#include <tactility/drivers/esp32_gpio_helpers.h>
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#include <tactility/drivers/gpio_controller.h>
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#include <esp_lcd_panel_io.h>
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#include <new>
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#include <vector>
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#define TAG "esp32_i8080"
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#define GET_CONFIG(device) ((const struct Esp32I8080Config*)device->config)
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#define GET_DATA(device) ((struct Esp32I8080Internal*)device_get_driver_data(device))
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extern "C" {
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struct Esp32I8080Internal {
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esp_lcd_i80_bus_handle_t bus_handle = nullptr;
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GpioDescriptor* dc_descriptor = nullptr;
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GpioDescriptor* wr_descriptor = nullptr;
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GpioDescriptor* rd_descriptor = nullptr;
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GpioDescriptor* d0_descriptor = nullptr;
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GpioDescriptor* d1_descriptor = nullptr;
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GpioDescriptor* d2_descriptor = nullptr;
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GpioDescriptor* d3_descriptor = nullptr;
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GpioDescriptor* d4_descriptor = nullptr;
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GpioDescriptor* d5_descriptor = nullptr;
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GpioDescriptor* d6_descriptor = nullptr;
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GpioDescriptor* d7_descriptor = nullptr;
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std::vector<GpioDescriptor*> cs_descriptors;
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void cleanup_pins() {
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release_pin(&dc_descriptor);
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release_pin(&wr_descriptor);
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release_pin(&rd_descriptor);
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release_pin(&d0_descriptor);
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release_pin(&d1_descriptor);
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release_pin(&d2_descriptor);
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release_pin(&d3_descriptor);
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release_pin(&d4_descriptor);
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release_pin(&d5_descriptor);
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release_pin(&d6_descriptor);
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release_pin(&d7_descriptor);
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for (auto*& desc : cs_descriptors) {
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release_pin(&desc);
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}
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cs_descriptors.clear();
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}
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};
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static error_t start(Device* device) {
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LOG_I(TAG, "start %s", device->name);
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auto* data = new (std::nothrow) Esp32I8080Internal();
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if (data == nullptr) return ERROR_OUT_OF_MEMORY;
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device_set_driver_data(device, data);
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const auto* config = GET_CONFIG(device);
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bool pins_ok =
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acquire_pin_or_set_null(config->pin_dc, GPIO_FLAG_DIRECTION_OUTPUT, &data->dc_descriptor) &&
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acquire_pin_or_set_null(config->pin_wr, GPIO_FLAG_DIRECTION_OUTPUT, &data->wr_descriptor) &&
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acquire_pin_or_set_null(config->pin_rd, GPIO_FLAG_DIRECTION_OUTPUT, &data->rd_descriptor) &&
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acquire_pin_or_set_null(config->pin_d0, GPIO_FLAG_DIRECTION_OUTPUT, &data->d0_descriptor) &&
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acquire_pin_or_set_null(config->pin_d1, GPIO_FLAG_DIRECTION_OUTPUT, &data->d1_descriptor) &&
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acquire_pin_or_set_null(config->pin_d2, GPIO_FLAG_DIRECTION_OUTPUT, &data->d2_descriptor) &&
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acquire_pin_or_set_null(config->pin_d3, GPIO_FLAG_DIRECTION_OUTPUT, &data->d3_descriptor) &&
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acquire_pin_or_set_null(config->pin_d4, GPIO_FLAG_DIRECTION_OUTPUT, &data->d4_descriptor) &&
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acquire_pin_or_set_null(config->pin_d5, GPIO_FLAG_DIRECTION_OUTPUT, &data->d5_descriptor) &&
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acquire_pin_or_set_null(config->pin_d6, GPIO_FLAG_DIRECTION_OUTPUT, &data->d6_descriptor) &&
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acquire_pin_or_set_null(config->pin_d7, GPIO_FLAG_DIRECTION_OUTPUT, &data->d7_descriptor);
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if (!pins_ok) {
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LOG_E(TAG, "Failed to acquire required i8080 pins");
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data->cleanup_pins();
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device_set_driver_data(device, nullptr);
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delete data;
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return ERROR_RESOURCE;
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}
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// RD is never toggled by the i80 LCD peripheral (write-only bus); drive it high once so the
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// panel doesn't see spurious read strobes.
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if (data->rd_descriptor != nullptr) {
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gpio_descriptor_set_level(data->rd_descriptor, true);
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}
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esp_lcd_i80_bus_config_t bus_cfg = {
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.dc_gpio_num = get_native_pin(data->dc_descriptor),
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.wr_gpio_num = get_native_pin(data->wr_descriptor),
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.clk_src = LCD_CLK_SRC_DEFAULT,
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.data_gpio_nums = {
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get_native_pin(data->d0_descriptor),
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get_native_pin(data->d1_descriptor),
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get_native_pin(data->d2_descriptor),
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get_native_pin(data->d3_descriptor),
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get_native_pin(data->d4_descriptor),
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get_native_pin(data->d5_descriptor),
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get_native_pin(data->d6_descriptor),
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get_native_pin(data->d7_descriptor),
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},
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.bus_width = 8,
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.max_transfer_bytes = static_cast<size_t>(config->max_transfer_bytes),
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.psram_trans_align = 64,
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.sram_trans_align = 4
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};
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esp_err_t ret = esp_lcd_new_i80_bus(&bus_cfg, &data->bus_handle);
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if (ret != ESP_OK) {
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LOG_E(TAG, "Failed to create I80 bus: %s", esp_err_to_name(ret));
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data->cleanup_pins();
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device_set_driver_data(device, nullptr);
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delete data;
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return ERROR_RESOURCE;
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}
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// Acquire and deselect all CS pins
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for (uint8_t i = 0; i < config->cs_gpios_count; i++) {
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const GpioPinSpec* cs = &config->cs_gpios[i];
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if (cs->gpio_controller == nullptr) continue;
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GpioDescriptor* desc = gpio_descriptor_acquire(cs->gpio_controller, cs->pin, GPIO_FLAG_DIRECTION_OUTPUT | GPIO_FLAG_ACTIVE_LOW, GPIO_OWNER_GPIO);
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if (desc != nullptr) {
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gpio_descriptor_set_level(desc, false); // logical low = physical high
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data->cs_descriptors.push_back(desc);
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} else {
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LOG_E(TAG, "Failed to acquire CS pin %u", i);
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}
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}
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return ERROR_NONE;
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}
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static error_t stop(Device* device) {
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LOG_I(TAG, "stop %s", device->name);
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auto* data = GET_DATA(device);
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if (data->bus_handle != nullptr) {
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esp_lcd_del_i80_bus(data->bus_handle);
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}
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data->cleanup_pins();
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device_set_driver_data(device, nullptr);
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delete data;
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return ERROR_NONE;
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}
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error_t esp32_i8080_get_cs_pin(Device* child_device, GpioPinSpec* out_pin) {
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auto* parent = device_get_parent(child_device);
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if (parent == nullptr || device_get_type(parent) != &I8080_CONTROLLER_TYPE) return ERROR_INVALID_STATE;
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const auto* config = GET_CONFIG(parent);
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int32_t index = child_device->address;
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if (index < 0 || index >= config->cs_gpios_count) return ERROR_OUT_OF_RANGE;
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*out_pin = config->cs_gpios[index];
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return ERROR_NONE;
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}
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error_t esp32_i8080_get_bus_handle(Device* child_device, esp_lcd_i80_bus_handle_t* out_handle) {
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auto* parent = device_get_parent(child_device);
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if (parent == nullptr || device_get_type(parent) != &I8080_CONTROLLER_TYPE) return ERROR_INVALID_STATE;
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auto* data = GET_DATA(parent);
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if (data == nullptr || data->bus_handle == nullptr) return ERROR_INVALID_STATE;
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*out_handle = data->bus_handle;
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return ERROR_NONE;
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}
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extern struct Module platform_esp32_module;
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Driver esp32_i8080_driver = {
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.name = "esp32_i8080",
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.compatible = (const char*[]) { "espressif,esp32-i8080", nullptr },
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.start_device = start,
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.stop_device = stop,
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.api = nullptr,
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.device_type = &I8080_CONTROLLER_TYPE,
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.owner = &platform_esp32_module,
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.internal = nullptr
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};
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} // extern "C"
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#endif // SOC_LCD_I80_SUPPORTED
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