dd05550cc5
ESP32-C3 doesn't actually support 'lcd mode' aka. parallel DMA, so it'll never be of use with this library and a HUB75 panel.
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
#pragma once
|
|
/*
|
|
* ESP32_I2S_PARALLEL_DMA
|
|
*/
|
|
|
|
#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>
|
|
|
|
// Get MCU Type and Max CLK Hz for MCU
|
|
#include <esp32_i2s_parallel_mcu_def.h>
|
|
|
|
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
|
|
bool clkphase; // Clock signal phase
|
|
} 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:
|
|
|
|
#ifdef ESP32_ORIG
|
|
// IS21 supports space saving single byte 8 bit parallel access
|
|
if(port == I2S_NUM_1) {
|
|
return 1;
|
|
}
|
|
#else
|
|
return 1;
|
|
#endif
|
|
|
|
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);
|
|
esp_err_t i2s_parallel_stop_dma(i2s_port_t port);
|
|
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
|
|
|