ESP32-HUB75-MatrixPanel-DMA/esp32_i2s_parallel_v2.h

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/*
* ESP32_I2S_PARALLEL_V2 (Version 2)
*/
#pragma once
#if defined(ESP32) || defined(IDF_VER)
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <stdbool.h>
#include <sys/types.h>
#include <freertos/FreeRTOS.h>
#include <driver/i2s.h>
#include <esp_err.h>
#include <rom/lldesc.h>
#define I2S_PARALLEL_CLOCK_HZ 80000000L
#define DMA_MAX (4096-4)
typedef enum {
I2S_PARALLEL_WIDTH_8,
I2S_PARALLEL_WIDTH_16,
I2S_PARALLEL_WIDTH_24,
I2S_PARALLEL_WIDTH_MAX
} i2s_parallel_cfg_bits_t;
typedef struct {
int gpio_bus[24]; // The parallel GPIOs to use, set gpio to -1 to disable
int gpio_clk;
int sample_rate; // 'clockspeed'
int sample_width;
int desccount_a;
lldesc_t * lldesc_a;
int desccount_b; // only used with double buffering
lldesc_t * lldesc_b; // only used with double buffering
} i2s_parallel_config_t;
static inline int i2s_parallel_get_memory_width(i2s_port_t port, i2s_parallel_cfg_bits_t width) {
switch(width) {
case I2S_PARALLEL_WIDTH_8:
// IS21 supports space saving single byte 8 bit parallel access
if(port == I2S_NUM_1) {
return 1;
}
case I2S_PARALLEL_WIDTH_16:
return 2;
case I2S_PARALLEL_WIDTH_24:
return 4;
default:
return -ESP_ERR_INVALID_ARG;
}
}
// DMA Linked List Creation
void link_dma_desc(volatile lldesc_t *dmadesc, volatile lldesc_t *prevdmadesc, void *memory, size_t size);
// I2S DMA Peripheral Setup Functions
esp_err_t i2s_parallel_driver_install(i2s_port_t port, i2s_parallel_config_t* conf);
esp_err_t i2s_parallel_send_dma(i2s_port_t port, lldesc_t* dma_descriptor);
i2s_dev_t* i2s_parallel_get_dev(i2s_port_t port);
// For frame buffer flipping / double buffering
typedef struct {
volatile lldesc_t *dmadesc_a, *dmadesc_b;
int desccount_a, desccount_b;
i2s_port_t i2s_interrupt_port_arg;
} i2s_parallel_state_t;
void i2s_parallel_flip_to_buffer(i2s_port_t port, int bufid);
bool i2s_parallel_is_previous_buffer_free();
// Callback function for when whole length of DMA chain has been sent out.
typedef void (*callback)(void);
void setShiftCompleteCallback(callback f);
#ifdef __cplusplus
}
#endif
#endif