disp_spi.c File Reference

#include "esp_system.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/semphr.h>
#include "lvgl/lvgl.h"
#include "disp_spi.h"
#include "disp_driver.h"

Macros
#define	CONFIG_LV_DISP_SPI_CS   5

Functions
void	spi_poll ()
	Polls the SPI bus for a pending SPI transaction to complete. More...
void	disp_spi_add_device_config (spi_host_device_t host, spi_device_interface_config_t *devcfg)
void	disp_spi_add_device (spi_host_device_t host)
void	disp_spi_transaction (const uint8_t *data, size_t length, disp_spi_send_flag_t flags, disp_spi_read_data *out, uint64_t addr)
void	disp_wait_for_pending_transactions (void)

Variables
SemaphoreHandle_t	spi_mutex
	Semaphore for the shared SPI bus. More...

Macro Definition Documentation

CONFIG_LV_DISP_SPI_CS

#define CONFIG_LV_DISP_SPI_CS   5

Function Documentation

spi_poll()

void spi_poll

(

)

Polls the SPI bus for a pending SPI transaction to complete.

This function blocks until a pending SPI transaction has finished. Once that transaction is complete, execution of code continues. Useful for using more than one peripheral on the same SPI bus without conflicts.

Note

This function is necessary when accessing the SD card on the shared SPI bus. Uses spi_device_polling_transmit. to repeatedly poll the SPI bus until the transaction completes.

disp_spi_add_device_config()

void disp_spi_add_device_config	(	spi_host_device_t	host,
		spi_device_interface_config_t *	devcfg
	)

disp_spi_add_device()

void disp_spi_add_device

(

spi_host_device_t

host

)

disp_spi_transaction()

void disp_spi_transaction	(	const uint8_t *	data,
		size_t	length,
		disp_spi_send_flag_t	flags,
		disp_spi_read_data *	out,
		uint64_t	addr
	)

disp_wait_for_pending_transactions()

void disp_wait_for_pending_transactions

(

void

)

Variable Documentation

spi_mutex

SemaphoreHandle_t spi_mutex

Semaphore for the shared SPI bus.

This semaphore helps protect the usage of the SPI bus. The implementation of the ILI9342C library uses this mutex to write to the display controller.