char* f1(char a[MAX_LENGTH + 1], char b[MAX_LENGTH + 1]) { int o = '0' - 0; int m = strlen(a); int n = strlen(b); int c; char x[2] = { '0', '\0' }; char y[MAX_LENGTH + 1]; if (m > n) { while (strlen(x) < m) strcat(x, a); *y = *b; c = m;此代码没写完不用补齐,请检查是否有问题
时间: 2024-04-06 09:33:48 浏览: 23
好的,这段代码的问题在于没有完整定义变量 y 的值,而在下一行直接操作了指针 y。在这种情况下,可能会导致不可预测的行为。正确的做法应该是在定义 y 时分配足够的空间,例如使用 malloc,或在定义 y 时初始化为 NULL,然后使用 strdup 函数拷贝 b 的值到 y 中。另外,这段代码中的 strcat 函数可能会导致数组越界的问题,因为 x 数组的长度只有 2,而在 while 循环中会不断地将 a 拼接到 x 后面,可能会导致 x 超出数组长度的范围。
相关问题
stm32f103c8t6串口2发送AT+LOCATION=1指令给EC01g,并解析GPS,显示到屏幕,stm32库函数版本的代码
下面是基于STM32 HAL库的串口2发送AT指令并解析GPS数据的代码,供参考:
```c
#include "stm32f1xx_hal.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define GPS_BUFFER_SIZE 256
UART_HandleTypeDef huart2;
char gps_buffer[GPS_BUFFER_SIZE];
int gps_buffer_index = 0;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if (huart->Instance == USART2)
{
if (gps_buffer_index < GPS_BUFFER_SIZE - 1)
{
gps_buffer[gps_buffer_index++] = huart->Instance->DR & 0xFF;
}
}
}
void clear_gps_buffer()
{
memset(gps_buffer, 0, GPS_BUFFER_SIZE);
gps_buffer_index = 0;
}
void send_at_command(char* command)
{
HAL_UART_Transmit(&huart2, (uint8_t*)command, strlen(command), HAL_MAX_DELAY);
}
void parse_gps_data(char* gps_data)
{
char* token = strtok(gps_data, ",");
int count = 0;
while (token != NULL)
{
if (count == 3) // latitude
{
float latitude = atof(token);
printf("Latitude: %f\n", latitude);
}
else if (count == 4) // north or south
{
if (strcmp(token, "S") == 0)
{
printf("Direction: South\n");
}
else
{
printf("Direction: North\n");
}
}
else if (count == 5) // longitude
{
float longitude = atof(token);
printf("Longitude: %f\n", longitude);
}
else if (count == 6) // east or west
{
if (strcmp(token, "W") == 0)
{
printf("Direction: West\n");
}
else
{
printf("Direction: East\n");
}
}
token = strtok(NULL, ",");
count++;
}
}
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART2_UART_Init();
while (1)
{
send_at_command("AT+LOCATION=1\r\n");
HAL_Delay(1000);
char* search_str = "+LOCATION:";
char* ptr = strstr(gps_buffer, search_str);
if (ptr != NULL)
{
ptr += strlen(search_str);
parse_gps_data(ptr);
}
clear_gps_buffer();
HAL_Delay(5000);
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
| RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
static void MX_USART2_UART_Init(void)
{
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
HAL_UART_Receive_IT(&huart2, (uint8_t*)gps_buffer, 1);
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);
/*Configure GPIO pin : PC13 */
GPIO_InitStruct.Pin = GPIO_PIN_13;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
}
```
需要注意的是,这只是一个简单的示例代码,无法保证完全正确和可靠,需要根据具体需求进行调整和修改。同时,还需要根据具体的硬件连接情况进行相应的配置。
stm32f103c8t6-max34865-pt100基于hal库的测温代码
以下是基于HAL库的STM32F103C8T6与MAX34865和PT100传感器的测温代码示例:
```c
#include "main.h"
#include "stm32f1xx_hal.h"
#define RS485_DE_Pin GPIO_PIN_2
#define RS485_DE_GPIO_Port GPIOB
UART_HandleTypeDef huart1;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART1_UART_Init();
char buffer[10];
float temperature = 0.0;
while (1)
{
// 发送读取温度命令
HAL_GPIO_WritePin(RS485_DE_GPIO_Port, RS485_DE_Pin, GPIO_PIN_SET); // 设置DE使能发送模式
HAL_UART_Transmit(&huart1, (uint8_t*)"R", 1, HAL_MAX_DELAY);
// 接收温度数据
HAL_GPIO_WritePin(RS485_DE_GPIO_Port, RS485_DE_Pin, GPIO_PIN_RESET); // 设置DE使能接收模式
HAL_UART_Receive(&huart1, (uint8_t*)buffer, 10, HAL_MAX_DELAY);
temperature = atof(buffer); // 将接收到的字符串转换为浮点数
// 进行温度处理或其他操作
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
static void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 9600;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitStruct.Pin = RS485_DE_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(RS485_DE_GPIO_Port, &GPIO_InitStruct);
}
```
这只是一个简单的示例代码,需要根据实际情况进行修改和调整。确保正确连接MAX34865和PT100传感器,并根据需要设置串口的波特率和GPIO引脚。
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