工具与软件：
尊敬的 TI 支持团队：
AM2632与湿度/温度传感器(NSHT30-Q1DNR)之间的 I2C 通信会遇到问题。 如果您提供解决此问题的指导、我将不胜感激。
问题：
写作品 、但是 读取失败 :发送从地址后( R/W=1 ),传感器 ACK ,但 SCL 保持不变 低电平 .
我尝试了各种读取和写入操作、每个读取操作都具有相同的响应、因此我无法完全输出时钟
设置：
传感器： 在7位地址上 0x44 .
I2C 速度：400kHz (标准模式)。
上拉：SDA/SCL 上为4.7kΩ。
问题：
在读取期间、为什么在从器件 ACK 后 SCL 保持低电平？ 这是主要配置问题还是传感器行为？
附件：
逻辑分析仪捕获(SCL_stuck.png)。
感谢您的帮助！
此致、
ZX
嗨 Brennan：
以下是我的代码、我对 SDK 的例程示例进行了一些修改
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#include <drivers/i2c.h>
#include <kernel/dpl/DebugP.h>
#include "ti_drivers_config.h"
#include "ti_drivers_open_close.h"
#include "ti_board_open_close.h"
extern uint32_t Board_i2cGetEepromDeviceAddr(void);
#define I2C_READ_LEN (6U)
static void i2c_read_error_handler(uint16_t sample, int32_t status);
void i2c_read_main(void *arg0)
{
uint16_t sample;
int32_t status;
uint32_t i2cReadTargetAddr;
uint8_t rxBuffer[I2C_READ_LEN];
uint8_t txBuffer[2];
I2C_Handle i2cHandle;
I2C_Transaction i2cTransaction;
Drivers_open();
Board_driversOpen();
i2cReadTargetAddr = 0x44;//Board_i2cGetEepromDeviceAddr();
i2cHandle = gI2cHandle[CONFIG_I2C0];
DebugP_log("[I2C] Read data ... !!!\r\n");
/* Set default transaction parameters */
I2C_Transaction_init(&i2cTransaction);
i2cTransaction.writeBuf = txBuffer;
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.writeCount = 2;
i2cTransaction.readCount = 1;
i2cTransaction.targetAddress = i2cReadTargetAddr;
txBuffer[0] = 0x24;
txBuffer[1] = 0x16;
status = I2C_transfer(i2cHandle, &i2cTransaction);
I2C_Transaction_init(&i2cTransaction);
/* Override with required transaction parameters */
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.readCount = I2C_READ_LEN;
i2cTransaction.targetAddress = i2cReadTargetAddr;
/* Read 20 samples and log them */
// for(sample = 0; sample < 20; sample++)
// {
status = I2C_transfer(i2cHandle, &i2cTransaction);
if(status == I2C_STS_SUCCESS)
{
DebugP_log("[I2C] Sample %u: %u\r\n", sample, rxBuffer[0]);
}
else
{
i2c_read_error_handler(sample, i2cTransaction.status);
}
// }
DebugP_log("[I2C] Read data ... DONE !!!\r\n");
if(status == SystemP_SUCCESS)
{
DebugP_log("All tests have passed!!\r\n");
}
else
{
DebugP_log("Some tests have failed!!\r\n");
}
Board_driversClose();
Drivers_close();
return;
}
static void i2c_read_error_handler(uint16_t sample, int32_t status)
{
switch(status)
{
case I2C_STS_ERR:
DebugP_logError("[I2C] Sample %u: Generic error occurred", sample);
break;
case I2C_STS_ERR_TIMEOUT:
DebugP_logError("[I2C] Sample %u: Timeout error occurred", sample);
break;
case I2C_STS_ERR_NO_ACK:
DebugP_logError("[I2C] Sample %u: No acknowledgement received", sample);
break;
case I2C_STS_ERR_ARBITRATION_LOST:
DebugP_logError("[I2C] Sample %u: Arbitration lost", sample);
break;
case I2C_STS_ERR_BUS_BUSY:
DebugP_logError("[I2C] Sample %u: Bus Bus Busy error occurred", sample);
break;
}
return;
}
期待您的回复
ZX
您好、ZX、
从我的初始分析来看、我有几个要点：
1.在你的代码中,我看到 I2C 写入操作后,你调用"I2C_Transaction_init ()"函数,并填充3个参数(目标地址, readBufa nd ReadCount )。 超时、控制器模式、状态和其他参数等其他参数采用如下所示的默认值 
在调用读取操作之前、请确保正确配置 I2C 事务结构
2.我明白为什么 I2C_READ_LEN 会更改为"6"、但根据传感器的数据表、主器件应在接收到前5B 后发送 ACK、并在第6个字节后发送停止命令。 您能验证一下是否出现这种情况吗？ 逻辑分析仪捕获结果 对我来说没有以高分辨率打开、因此我看不清。 
3.我觉得代码中没有问题,我认为我们在正确执行读取操作方面缺少了一些步骤。
此致、
Shaunak
Shaunak 您好：
感谢您的答复。
1. 我提到了多个例程,只配置了目标器地址, readBufa 和 ReadCount、我遵循他的指示,我也配置了超时,但我没有正确地读取数据。 其他参数使用默认参数更好
当前的问题是在读取时、在发送从器件地址之后、时钟终止并变为低电平
此致
ZX