代码解析 static const HcfParaConfig *FindConfig(const HcString* tag) { if (tag == NULL) { return NULL; } for (uint32_t i = 0; i < sizeof(PARAM_CONFIG) / sizeof(HcfParaConfig); ++i) { if (StringCompare(tag, PARAM_CONFIG[i].tag) == 0) { return &PARAM_CONFIG[i]; } } return NULL; }
时间: 2024-04-27 09:23:14 浏览: 142
这段代码实现了一个名为 FindConfig 的静态函数,用于根据参数名称查找对应的配置信息。该函数的具体实现如下:
首先,该函数接收一个类型为 HcString* 的参数 tag,表示需要查找的参数名称。如果 tag 为 NULL,则直接返回 NULL。
然后,该函数通过 for 循环遍历一个名为 PARAM_CONFIG 的参数配置数组,该数组中存储了多个 HcfParaConfig 类型的参数配置信息。
在循环中,使用 StringCompare 函数比较当前参数配置的 tag 字段和传入的参数名称 tag 是否相等。如果相等,则返回对应的参数配置信息。
如果循环结束后仍未找到对应的参数配置信息,则返回 NULL。
可以看出,该函数的作用是根据参数名称查找对应的参数配置信息,便于后续的参数设置和读取操作。
相关问题
esp32 读写flash idf完整代码
以下是 ESP32 IDF 中读写 Flash 的完整代码示例:
```c
#include <stdio.h>
#include "esp_log.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "driver/gpio.h"
#include "driver/spi_master.h"
#include "esp_partition.h"
static const char* TAG = "flash-example";
#define SPI_DMA_CHAN 2
#define FLASH_SECTOR_SIZE 0x1000
#define SPI_FLASH_MOSI_PIN 23
#define SPI_FLASH_MISO_PIN 19
#define SPI_FLASH_CLK_PIN 18
#define SPI_FLASH_CS_PIN 5
// Function to initialize SPI bus
static void spi_init()
{
// Define bus configuration
spi_bus_config_t buscfg = {
.miso_io_num = SPI_FLASH_MISO_PIN,
.mosi_io_num = SPI_FLASH_MOSI_PIN,
.sclk_io_num = SPI_FLASH_CLK_PIN,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.max_transfer_sz = 0
};
// Define device configuration
spi_device_interface_config_t devcfg = {
.clock_speed_hz = 10*1000*1000, // Clock out at 10 MHz
.mode = 0, // SPI mode 0
.spics_io_num = SPI_FLASH_CS_PIN, // CS pin
.queue_size = 7, // We want to be able to queue 7 transactions at a time
.pre_cb = NULL, // No pre-transfer callback
.post_cb = NULL, // No post-transfer callback
.flags = SPI_DEVICE_NO_DUMMY
};
// Initialize the SPI bus
esp_err_t ret = spi_bus_initialize(VSPI_HOST, &buscfg, SPI_DMA_CHAN);
ESP_ERROR_CHECK(ret);
// Attach the flash chip to the SPI bus
spi_device_handle_t spi_handle;
ret = spi_bus_add_device(VSPI_HOST, &devcfg, &spi_handle);
ESP_ERROR_CHECK(ret);
}
// Function to read from flash
static void read_flash()
{
ESP_LOGI(TAG, "Reading flash...");
// Open flash partition
const esp_partition_t* partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, "my_partition");
if (!partition) {
ESP_LOGE(TAG, "Partition not found");
return;
}
// Initialize SPI bus
spi_init();
// Set up transfer
spi_transaction_t t = {
.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA,
.cmd = 0x03, // Read command
.addr = 0x0, // Start address of read
.length = 8*FLASH_SECTOR_SIZE // Read data size
};
// Read data from flash
uint8_t* data = malloc(FLASH_SECTOR_SIZE);
t.rx_buffer = data;
for (int i = 0; i < partition->size; i += FLASH_SECTOR_SIZE) {
t.addr = i;
esp_err_t ret = spi_device_polling_transmit(spi_handle, &t);
ESP_ERROR_CHECK(ret);
ESP_LOGI(TAG, "Data at address 0x%x:", i);
for (int j = 0; j < FLASH_SECTOR_SIZE; j++) {
printf("%02x ", data[j]);
}
printf("\n");
}
// Clean up
free(data);
spi_bus_remove_device(spi_handle);
spi_bus_free(VSPI_HOST);
}
// Function to write to flash
static void write_flash()
{
ESP_LOGI(TAG, "Writing flash...");
// Open flash partition
const esp_partition_t* partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, "my_partition");
if (!partition) {
ESP_LOGE(TAG, "Partition not found");
return;
}
// Initialize SPI bus
spi_init();
// Erase flash sector
esp_err_t ret = spi_flash_erase_sector(partition->address);
ESP_ERROR_CHECK(ret);
// Set up transfer
spi_transaction_t t = {
.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA,
.cmd = 0x02, // Write command
.addr = 0x0, // Start address of write
.length = 8*FLASH_SECTOR_SIZE // Write data size
};
// Write data to flash
uint8_t* data = malloc(FLASH_SECTOR_SIZE);
for (int i = 0; i < FLASH_SECTOR_SIZE; i++) {
data[i] = i % 255;
}
t.tx_buffer = data;
ret = spi_device_polling_transmit(spi_handle, &t);
ESP_ERROR_CHECK(ret);
// Clean up
free(data);
spi_bus_remove_device(spi_handle);
spi_bus_free(VSPI_HOST);
}
void app_main()
{
// Initialize NVS
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
// Write data to flash
write_flash();
// Read data from flash
read_flash();
}
```
这个示例代码演示了如何使用 ESP32 的 SPI 总线来读写 Flash。其中,`spi_init()` 函数初始化了 SPI 总线,`read_flash()` 函数从 Flash 中读取数据,`write_flash()` 函数将数据写入 Flash。在这个示例代码中,我们使用了 SPI 总线连接的 Flash,但是也可以连接其他的 SPI 设备。同时,我们使用了 ESP-IDF 中提供的 `spi_device_polling_transmit()` 函数来进行数据的读写。如果你需要进行更高级的操作,可以使用 `spi_device_queue_trans()` 函数来设置队列,并使用回调函数来处理数据。
ESp32 CH116驱动 IDF代码
驱动 CH116 USB 转串口芯片的 ESP32 IDF 代码可以参考以下步骤:
1. 在 ESP32 IDF 项目中,创建一个新的驱动文件夹,例如:components/ch116_driver。
2. 在 ch116_driver 文件夹下创建一个 ch116.c 文件,并添加如下代码:
```
#include "ch116.h"
#include "driver/uart.h"
static const char *TAG = "CH116";
#define CH116_UART_PORT UART_NUM_1
#define CH116_UART_RX_PIN GPIO_NUM_5
#define CH116_UART_TX_PIN GPIO_NUM_18
static void ch116_uart_init(void)
{
uart_config_t uart_config = {
.baud_rate = 115200,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE
};
ESP_ERROR_CHECK(uart_param_config(CH116_UART_PORT, &uart_config));
ESP_ERROR_CHECK(uart_set_pin(CH116_UART_PORT, CH116_UART_TX_PIN, CH116_UART_RX_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));
ESP_ERROR_CHECK(uart_driver_install(CH116_UART_PORT, 1024, 1024, 0, NULL, 0));
}
void ch116_init(void)
{
ch116_uart_init();
}
void ch116_write(const uint8_t *data, size_t size)
{
uart_write_bytes(CH116_UART_PORT, (const char *)data, size);
}
int ch116_read(uint8_t *data, size_t size, uint32_t timeout)
{
return uart_read_bytes(CH116_UART_PORT, data, size, timeout / portTICK_RATE_MS);
}
void ch116_flush(void)
{
uart_flush(CH116_UART_PORT);
}
```
3. 在 ch116_driver 文件夹下创建一个 ch116.h 文件,并添加如下代码:
```
#ifndef __CH116_H__
#define __CH116_H__
#include "esp_err.h"
#include <stdint.h>
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
void ch116_init(void);
void ch116_write(const uint8_t *data, size_t size);
int ch116_read(uint8_t *data, size_t size, uint32_t timeout);
void ch116_flush(void);
#ifdef __cplusplus
}
#endif
#endif /* __CH116_H__ */
```
4. 在 main.c 中调用 ch116_init() 函数进行初始化,并调用其它函数进行读写操作。
```
#include "ch116.h"
void app_main(void)
{
uint8_t tx_data[] = "Hello, CH116!\n";
uint8_t rx_data[32];
size_t rx_size;
ch116_init();
ch116_write(tx_data, sizeof(tx_data));
rx_size = ch116_read(rx_data, sizeof(rx_data), 1000);
rx_data[rx_size] = '\0';
printf("Received: %s\n", rx_data);
ch116_flush();
}
```
这样就可以在 ESP32 IDF 项目中使用 CH116 USB 转串口芯片了。
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