hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE什么意思
时间: 2023-12-17 13:02:55 浏览: 70
`hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE` 这行代码是用来配置 I2C 从机的通用调用模式。
I2C 总线有一种特殊的通信模式叫做“通用调用模式”(General Call Mode)。当主机发送一个特定的广播地址时,所有的从机都会响应该广播,并且从机可以根据自己的需要执行相应的操作。
这行代码中的 `I2C_GENERALCALL_DISABLE` 意味着禁用通用调用模式。也就是说,当主机发送广播地址时,与该 I2C 从机连接的设备将不会响应广播。从机只会响应与自己的地址匹配的命令。
如果您想启用通用调用模式,可以将该行代码改为 `I2C_GENERALCALL_ENABLE`。这样,当主机发送广播地址时,与该 I2C 从机连接的设备将会响应广播。
具体是否需要启用或禁用通用调用模式,取决于您的应用需求和设备之间的通信协议。一般情况下,默认禁用通用调用模式是比较常见的做法。
相关问题
上面的代码怎么插入这里: hi2c1.Instance = I2C1; hi2c1.Init.Timing = 0x10707DBC; hi2c1.Init.OwnAddress1 = 0; hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT; hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; hi2c1.Init.OwnAddress2 = 0; hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK; hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; if (HAL_I2C_Init(&hi2c1) != HAL_OK) { Error_Handler(); } /** Configure Analogue filter */ if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK) { Error_Handler(); } /** Configure Digital filter */ if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN I2C1_Init 2 */ /* USER CODE END I2C1_Init 2 */+ }
你可以将上面提供的代码插入到 `MX_I2C1_Init()` 函数中的适当位置。根据你的需求,你可以在以下两个位置之一插入代码:
1. 将代码插入到 `/* USER CODE BEGIN I2C1_Init 2 */` 和 `/* USER CODE END I2C1_Init 2 */` 之间。这是一个专门用来插入用户自定义代码的区域。
```c
static void MX_I2C1_Init(void)
{
// ...
/* USER CODE BEGIN I2C1_Init 2 */
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x10707DBC;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
{
Error_Handler();
}
if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE END I2C1_Init 2 */
}
```
2. 将代码插入到函数的适当位置,例如在初始化 I2C1 的代码后面。
```c
static void MX_I2C1_Init(void)
{
// ...
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x10707DBC;
hi2c1.Init.OwnAddress1 = 0;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
{
Error_Handler();
}
if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
{
Error_Handler();
}
// ...
}
```
请注意,第一种方法更加推荐,因为它是用来插入用户自定义代码的专门区域。这样做可以确保在代码生成工具更新或重新生成代码时,你的自定义代码不会被覆盖或丢失。
希望这次回答能够帮到你。如果你还有其他问题,请随时提问。
#include "i2c.h"#define I2C_SPEED 100000 // I2C总线速度,单位为Hzvoid i2c_init(void){ GPIO_InitTypeDef GPIO_InitStruct; I2C_InitTypeDef I2C_InitStruct; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); // 使能GPIOB时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); // 使能I2C1时钟 // 配置GPIOB6和GPIOB7为复用推挽输出 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStruct); // 配置I2C1为标准模式,时钟速度为100kHz I2C_InitStruct.I2C_Mode = I2C_Mode_I2C; I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2; I2C_InitStruct.I2C_OwnAddress1 = 0x00; I2C_InitStruct.I2C_Ack = I2C_Ack_Enable; I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStruct.I2C_ClockSpeed = I2C_SPEED; I2C_Init(I2C1, &I2C_InitStruct); I2C_Cmd(I2C1, ENABLE); // 使能I2C1}void i2c_write(uint8_t addr, uint8_t *data, uint16_t len){ uint32_t timeout = 0; while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)) { if (++timeout > 0x10000) return; } I2C_GenerateSTART(I2C1, ENABLE); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) { if (++timeout > 0x10000) return; } I2C_Send7bitAddress(I2C1, addr << 1, I2C_Direction_Transmitter); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) { if (++timeout > 0x10000) return; } while (len--) { I2C_SendData(I2C1, *data++); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)) { if (++timeout > 0x10000) return; } } I2C_GenerateSTOP(I2C1, ENABLE);}void i2c_read(uint8_t addr, uint8_t *data, uint16_t len){ uint32_t timeout = 0; while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)) { if (++timeout > 0x10000) return; } I2C_GenerateSTART(I2C1, ENABLE); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) { if (++timeout > 0x10000) return; } I2C_Send7bitAddress(I2C1, addr << 1, I2C_Direction_Receiver); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED)) { if (++timeout > 0x10000) return; } while (len--) { if (len == 0) I2C_AcknowledgeConfig(I2C1, DISABLE); timeout = 0; while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) { if (++timeout > 0x10000) return; } *data++ = I2C_ReceiveData(I2C1); } I2C_AcknowledgeConfig(I2C1, ENABLE); I2C_GenerateSTOP(I2C1, ENABLE);}
以下是使用STM32 HAL库函数实现的代码示例:
```c
#include "stm32f1xx_hal.h"
#define I2C_SPEED 100000
I2C_HandleTypeDef hi2c1;
void i2c_init(void)
{
hi2c1.Instance = I2C1;
hi2c1.Init.ClockSpeed = I2C_SPEED;
hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
hi2c1.Init.OwnAddress1 = 0x00;
hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
hi2c1.Init.OwnAddress2 = 0;
hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if (HAL_I2C_Init(&hi2c1) != HAL_OK)
{
Error_Handler();
}
}
void i2c_write(uint8_t addr, uint8_t *data, uint16_t len)
{
if (HAL_I2C_Master_Transmit(&hi2c1, addr << 1, data, len, HAL_MAX_DELAY) != HAL_OK)
{
Error_Handler();
}
}
void i2c_read(uint8_t addr, uint8_t *data, uint16_t len)
{
if (HAL_I2C_Master_Receive(&hi2c1, addr << 1, data, len, HAL_MAX_DELAY) != HAL_OK)
{
Error_Handler();
}
}
```
以上代码使用STM32 HAL库函数实现了I2C初始化、写入和读取操作。请注意,需要在CubeMX工具中配置I2C时钟和GPIO引脚。