esp32-idf spi3通信例程,其中MOSI为引脚23,SCK引脚为18,DC引脚为2,RES引脚为4,BL引脚为5
时间: 2024-04-13 08:31:02 浏览: 220
以下是一个使用ESP-IDF框架的ESP32 SPI3通信的示例代码,其中MOSI引脚为23,SCK引脚为18,DC引脚为2,RES引脚为4,BL引脚为5:
```c
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/spi_master.h"
#include "driver/gpio.h"
#define PIN_CLK 18
#define PIN_MISO -1
#define PIN_MOSI 23
#define PIN_CS -1
#define PIN_DC 2
#define PIN_RES 4
#define PIN_BL 5
void spi_task(void *pvParameters) {
spi_device_handle_t spi;
spi_bus_config_t bus_config = {
.mosi_io_num = PIN_MOSI,
.miso_io_num = PIN_MISO,
.sclk_io_num = PIN_CLK,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 0,
};
spi_device_interface_config_t dev_config = {
.command_bits = 0,
.address_bits = 0,
.dummy_bits = 0,
.mode = 0,
.duty_cycle_pos = 0,
.cs_ena_pretrans = 0,
.cs_ena_posttrans = 0,
.clock_speed_hz = 1000000, // 设置时钟频率为1MHz
.input_delay_ns = 0,
.spics_io_num = PIN_CS,
.flags = 0,
.queue_size = 1,
.pre_cb = NULL,
.post_cb = NULL,
};
spi_device_handle_t spi_handle;
spi_bus_initialize(VSPI_HOST, &bus_config, 1);
spi_bus_add_device(VSPI_HOST, &dev_config, &spi_handle);
gpio_pad_select_gpio(PIN_DC);
gpio_set_direction(PIN_DC, GPIO_MODE_OUTPUT);
gpio_pad_select_gpio(PIN_RES);
gpio_set_direction(PIN_RES, GPIO_MODE_OUTPUT);
gpio_pad_select_gpio(PIN_BL);
gpio_set_direction(PIN_BL, GPIO_MODE_OUTPUT);
gpio_set_level(PIN_BL, 1);
while (1) {
gpio_set_level(PIN_DC, 0); // 设置DC引脚为命令模式
// 发送命令
uint8_t send_data[2] = {0x80, 0x01}; // 示例命令,具体根据你的需求来修改
spi_transaction_t trans_desc = {
.flags = 0,
.cmd = 0,
.addr = 0,
.length = 16, // 数据位宽为16位
.rxlength = 0,
.tx_buffer = send_data,
.rx_buffer = NULL,
};
spi_device_polling_transmit(spi_handle, &trans_desc);
gpio_set_level(PIN_DC, 1); // 设置DC引脚为数据模式
// 发送数据
uint8_t send_data2[4] = {0x12, 0x34, 0x56, 0x78}; // 示例数据,具体根据你的需求来修改
spi_transaction_t trans_desc2 = {
.flags = 0,
.cmd = 0,
.addr = 0,
.length = 32, // 数据位宽为32位
.rxlength = 0,
.tx_buffer = send_data2,
.rx_buffer = NULL,
};
spi_device_polling_transmit(spi_handle, &trans_desc2);
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}
void app_main() {
xTaskCreate(spi_task, "spi_task", 2048, NULL, 10, NULL);
}
```
在这个示例中,我们使用了ESP32的VSPI总线,并将引脚18、23分别连接到SPI3的SCK和MOSI信号。引脚2和4分别用作DC和RES引脚,引脚5用作BL引脚。
我们首先定义了SPI总线和设备的配置参数。然后,通过调用spi_bus_initialize()函数初始化SPI总线,并通过spi_bus_add_device()函数将SPI设备添加到总线上。
在任务函数spi_task()中,我们通过gpio_pad_select_gpio()和gpio_set_direction()函数来设置DC、RES和BL引脚的功能模式,并使用gpio_set_level()函数来控制BL引脚的电平。
在循环中,我们首先设置DC引脚为命令模式,然后通过spi_device_polling_transmit()函数发送命令数据。接着,我们设置DC引脚为数据模式,再次使用spi_device_polling_transmit()函数发送数据。
请根据你的具体需求进行适当的修改和配置。希望这个例程能帮助你使用ESP-IDF框架进行ESP32 SPI3通信!
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