lvgl_esp32_drivers/lvgl_touch/tp_spi.c

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/**
* @file tp_spi.c
*
*/
/*********************
* INCLUDES
*********************/
#include "tp_spi.h"
#include "touch_driver.h"
#include "esp_system.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#include <string.h>
#include "../lvgl_helpers.h"
#include "../lvgl_spi_conf.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static spi_device_handle_t spi;
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void tp_spi_add_device_config(spi_host_device_t host, spi_device_interface_config_t *devcfg)
{
esp_err_t ret=spi_bus_add_device(host, devcfg, &spi);
assert(ret==ESP_OK);
}
void tp_spi_add_device(spi_host_device_t host)
{
spi_device_interface_config_t devcfg={
.clock_speed_hz = SPI_TOUCH_CLOCK_SPEED_HZ,
.mode = SPI_TOUCH_SPI_MODE,
.spics_io_num=TP_SPI_CS, //CS pin
.queue_size=1,
.pre_cb=NULL,
.post_cb=NULL,
.command_bits = 8,
.address_bits = 0,
.dummy_bits = 0,
.flags = SPI_DEVICE_HALFDUPLEX | SPI_DEVICE_NO_DUMMY,
};
//Attach the Touch controller to the SPI bus
tp_spi_add_device_config(host, &devcfg);
}
void tp_spi_xchg(uint8_t* data_send, uint8_t* data_recv, uint8_t byte_count)
{
spi_transaction_t t = {
.length = byte_count * 8, // SPI transaction length is in bits
.tx_buffer = data_send,
.rx_buffer = data_recv};
esp_err_t ret = spi_device_transmit(spi, &t);
assert(ret == ESP_OK);
}
void tp_spi_write_reg(uint8_t* data, uint8_t byte_count)
{
spi_transaction_t t = {
.length = byte_count * 8,
.tx_buffer = data,
.flags = 0
};
esp_err_t ret = spi_device_transmit(spi, &t);
assert(ret == ESP_OK);
}
void tp_spi_read_reg(uint8_t reg, uint8_t* data, uint8_t byte_count)
{
spi_transaction_t t = {
.length = (byte_count + sizeof(reg)) * 8,
.rxlength = byte_count * 8,
.cmd = reg,
.rx_buffer = data,
.flags = 0
};
// Read - send first byte as command
esp_err_t ret = spi_device_transmit(spi, &t);
assert(ret == ESP_OK);
}
/**********************
* STATIC FUNCTIONS
**********************/