ESP32 with driver led TLC5927

akon13014
Posts: 3
Joined: Tue May 29, 2018 8:48 am

ESP32 with driver led TLC5927

Postby akon13014 » Tue Jul 10, 2018 12:13 pm

Hi,
I'm a beginner and I wanted to use the ESP32 to drive 16 leds with TLC5927;
You find the datasheet here http://www.ti.com/lit/ds/symlink/tlc5926.pdf
I use the following code t read out the package but it doesn't work :roll: , I use SPI bus of ESP to communicate with the TL5927. To start, I just want to run one led
I searched in the technical documentation without success, can anyone help me please ?

Thank you

Code: Select all

#include "driver/periph_ctrl.h"
#include "driver/timer.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "freertos/task.h"
#include "timer.h"
//#include "driver/spi_master.h"
#include "driver/gpio.h"
#include "spi_master.h"
#include "freertos/event_groups.h"

#define LED0  0b0000000000000000;
#define LED1  0b0000000000000001;
#define LED2  0b0000000000000010;
#define LED3  0b0000000000000100;
#define LED4  0b0000000000001000;
#define LED5  0b0000000000010000;
#define LED6  0b0000000000100000;
#define LED7  0b0000000001000000;
#define LED8  0b0000000010000000;
#define LED9  0b0000000100000000;
#define LED10 0b0000001000000000;
#define LED11 0b0000010000000000;
#define LED12 0b0000100000000000;
#define LED13 0b0001000000000000;
#define LED14 0b0010000000000000;
#define LED15 0b0100000000000000;

//define pins for SPI bus
#define PIN_NUM_MOSI 14
#define PIN_NUM_CLK  19
#define PIN_NUM_CS   22
#define PIN_NUM_OE   2

void spi_bus (void *arg){
    spi_device_handle_t spi;
    esp_err_t ret;
  //################ INIT GPIO ################
    gpio_set_direction(PIN_NUM_MOSI, GPIO_MODE_OUTPUT);
    gpio_set_direction(PIN_NUM_CLK, GPIO_MODE_OUTPUT);
    gpio_set_direction(PIN_NUM_CS, GPIO_MODE_OUTPUT);
    spi_bus_config_t buscfg={
            .miso_io_num=-1,
            .mosi_io_num=PIN_NUM_MOSI,
            .sclk_io_num=PIN_NUM_CLK,
            .quadwp_io_num=-1,
            .quadhd_io_num=-1
    };
    spi_device_interface_config_t devcfg={
            .clock_speed_hz=10000000, //Clock out at 30 MHz
            .mode=0,                  //Falling edge
            .spics_io_num=PIN_NUM_CS, //CS pin
            .queue_size=1,            //We want to be able to queue 7 transactions at a time
			.pre_cb = NULL,
			.post_cb = NULL
    };

    //Initialize the SPI bus
    ret = spi_bus_initialize(1, &buscfg, 1);
    ESP_ERROR_CHECK(ret);

    //Attach the TLC5927 to the SPI bus
    ret = spi_bus_add_device(1, &devcfg, &spi);
    ESP_ERROR_CHECK(ret);

    uint data= NULL; //16 bit
    spi_transaction_t trans_desc={
            .address=0,
            .command=0,
            .flags=0,
            .length=0,
            .rxlength=NULL,
            .tx_buffer=&data,
            .rx_buffer=0,

    };




    while (1) {
        	gpio_set_level(PIN_NUM_OE, 1);			//Output enable when is down
            ESP_ERROR_CHECK(spi_device_transmit(spi, &trans_desc));
            data = LED1;
        	spi_transaction_t t;
                    memset(&t, 0, sizeof(t));       //Zero out the transaction
                    t.length=16;                    //Transaction length
                    t.tx_buffer= &data;               //Data
                    ret=spi_device_transmit(spi, &t);  //Transmit!
                    assert(ret==ESP_OK);            //Should have had no issues.
            gpio_set_level(PIN_NUM_OE, 0); 			//Output enable
            vTaskDelay(10/portTICK_RATE_MS);
            gpio_set_level(PIN_NUM_OE, 1);
            vTaskDelay(10000/portTICK_RATE_MS);
    }
}

void app_main()
 {
	 //nvs_flash_init();
	 //tcpip_adapter_init();

	 //############# GPIO INIT ##############
	 gpio_config_t gpioConfig;
	 gpioConfig.pin_bit_mask = (1 << 2);
	 gpioConfig.mode = GPIO_MODE_OUTPUT;
	 gpioConfig.pull_up_en = GPIO_PULLUP_DISABLE;
	 gpioConfig.pull_down_en = GPIO_PULLDOWN_DISABLE;
	 gpioConfig.intr_type = GPIO_INTR_DISABLE;
	 gpio_config(&gpioConfig);

	 xTaskCreate(spi_bus, "BUS SPI", 2048, NULL, 5, NULL);
 }

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