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/*
Simple example of using the ESP32-C6's parallel IO peripheral for general-purpose
parallel data output with DMA.
Credits to ESPRESSIF them selfe, they made the first example:
https://github.com/espressif/esp-idf/tree/release/v5.1/examples/peripherals/parlio/simple_rgb_led_matrix
And Credits to the guy who implemented the S3 version of this library.
There is a lot of resusable code
*/
#pragma once
#include <sdkconfig.h>
#ifdef CONFIG_IDF_TARGET_ESP32C6
#include "driver/parlio_tx.h"
#include <esp_private/gdma.h>
#include <hal/dma_types.h>
#include <hal/gpio_hal.h>
#define DMA_MAX (4096-4)
#define HUB75_DMA_DESCRIPTOR_T dma_descriptor_t
class Bus_Parallel16
{
public:
Bus_Parallel16()
{
}
struct config_t
{
// LCD_CAM peripheral number. No need to change (only 0 for ESP32-S3.)
//int port = 0;
// max 40MHz (when in 16 bit / 2 byte mode)
uint32_t bus_freq = 10000000;
int8_t pin_wr = -1;
//int8_t pin_rd = -1;
//int8_t pin_rs = -1; // D/C
bool invert_pclk = false;
//bool psram_clk_override = false;
union
{
int8_t pin_data[16];
struct
{
int8_t pin_d0;
int8_t pin_d1;
int8_t pin_d2;
int8_t pin_d3;
int8_t pin_d4;
int8_t pin_d5;
int8_t pin_d6;
int8_t pin_d7;
int8_t pin_d8;
int8_t pin_d9;
int8_t pin_d10;
int8_t pin_d11;
int8_t pin_d12;
int8_t pin_d13;
int8_t pin_d14;
int8_t pin_d15;
};
};
};
const config_t& config(void) const { return _cfg; }
void config(const config_t& config);
bool init(void) ;
void release(void) ;
void enable_double_dma_desc();
bool allocate_dma_desc_memory(size_t len);
void create_dma_desc_link(void *memory, size_t size, bool dmadesc_b = false);
void dma_transfer_start();
void dma_transfer_stop();
void flip_dma_output_buffer(int back_buffer_id);
private:
config_t _cfg;
gdma_channel_handle_t dma_chan;
uint32_t _dmadesc_count = 0; // number of dma decriptors
uint32_t _dmadesc_a_idx = 0;
uint32_t _dmadesc_b_idx = 0;
HUB75_DMA_DESCRIPTOR_T* _dmadesc_a = nullptr;
HUB75_DMA_DESCRIPTOR_T* _dmadesc_b = nullptr;
bool _double_dma_buffer = false;
//bool _dmadesc_a_active = true;
};
#endif
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