您好我正在进行一个项目，我正在使用murata cmwx1zzabz（该模块由STM32L072CZ和SX1276收发器供电）。目标最终是使用lorawan将数据从我的传感器（VL53L1X）发送到互联网。
所以我开始在我的st B-L072Z_LRWAN1发现板上使用ST的lorawan堆栈。当我试图将传感器连接到proccesor时，它不起作用。
然后我决定使用“Fresh”STM32cubeMX项目，我想让I2C连接工作。
通过这两个项目，CLK和SDA引脚上只有330mV的直流电压。
我是整个STcube项目的新手，所以我可能会忘记一些明显的东西。我已经在这个问题上工作了将近18个小时，而现在我正试图让SCL和SDA线路正常工作。
我的代码：
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_RTC_Init();
MX_I2C1_Init();
/* USER CODE BEGIN 2 */
uint8_t buf = 25; // random value just to see if i can get the SCL and SDA lines to change from value
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
HAL_I2C_Master_Transmit(&hi2c1,0x18<<1,&buf,2,100000);
HAL_Delay(1000);
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
static void MX_I2C1_Init(void)
{
/* USER CODE BEGIN I2C1_Init 0 */
/* USER CODE END I2C1_Init 0 */
/* USER CODE BEGIN I2C1_Init 1 */
/* USER CODE END I2C1_Init 1 */
hi2c1.Instance = I2C1;
hi2c1.Init.Timing = 0x00707CBB;
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();
}
}
HAL_StatusTypeDef HAL_I2C_Init(I2C_HandleTypeDef *hi2c)
{
/* Check the I2C handle allocation */
if (hi2c == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
assert_param(IS_I2C_OWN_ADDRESS1(hi2c->Init.OwnAddress1));
assert_param(IS_I2C_ADDRESSING_MODE(hi2c->Init.AddressingMode));
assert_param(IS_I2C_DUAL_ADDRESS(hi2c->Init.DualAddressMode));
assert_param(IS_I2C_OWN_ADDRESS2(hi2c->Init.OwnAddress2));
assert_param(IS_I2C_OWN_ADDRESS2_MASK(hi2c->Init.OwnAddress2Masks));
assert_param(IS_I2C_GENERAL_CALL(hi2c->Init.GeneralCallMode));
assert_param(IS_I2C_NO_STRETCH(hi2c->Init.NoStretchMode));
if (hi2c->State == HAL_I2C_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hi2c->Lock = HAL_UNLOCKED;
#if (USE_HAL_I2C_REGISTER_CALLBACKS == 1)
/* Init the I2C Callback settings */
hi2c->MasterTxCpltCallback = HAL_I2C_MasterTxCpltCallback; /* Legacy weak MasterTxCpltCallback */
hi2c->MasterRxCpltCallback = HAL_I2C_MasterRxCpltCallback; /* Legacy weak MasterRxCpltCallback */
hi2c->SlaveTxCpltCallback = HAL_I2C_SlaveTxCpltCallback; /* Legacy weak SlaveTxCpltCallback */
hi2c->SlaveRxCpltCallback = HAL_I2C_SlaveRxCpltCallback; /* Legacy weak SlaveRxCpltCallback */
hi2c->ListenCpltCallback = HAL_I2C_ListenCpltCallback; /* Legacy weak ListenCpltCallback */
hi2c->MemTxCpltCallback = HAL_I2C_MemTxCpltCallback; /* Legacy weak MemTxCpltCallback */
hi2c->MemRxCpltCallback = HAL_I2C_MemRxCpltCallback; /* Legacy weak MemRxCpltCallback */
hi2c->ErrorCallback = HAL_I2C_ErrorCallback; /* Legacy weak ErrorCallback */
hi2c->AbortCpltCallback = HAL_I2C_AbortCpltCallback; /* Legacy weak AbortCpltCallback */
hi2c->AddrCallback = HAL_I2C_AddrCallback; /* Legacy weak AddrCallback */
if (hi2c->MspInitCallback == NULL)
{
hi2c->MspInitCallback = HAL_I2C_MspInit; /* Legacy weak MspInit */
}
/* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
hi2c->MspInitCallback(hi2c);
#else
/* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
HAL_I2C_MspInit(hi2c);
#endif /* USE_HAL_I2C_REGISTER_CALLBACKS */
}
hi2c->State = HAL_I2C_STATE_BUSY;
/* Disable the selected I2C peripheral */
__HAL_I2C_DISABLE(hi2c);
/*---------------------------- I2Cx TIMINGR Configuration ------------------*/
/* Configure I2Cx: Frequency range */
hi2c->Instance->TIMINGR = hi2c->Init.Timing & TIMING_CLEAR_MASK;
/*---------------------------- I2Cx OAR1 Configuration ---------------------*/
/* Disable Own Address1 before set the Own Address1 configuration */
hi2c->Instance->OAR1 &= ~I2C_OAR1_OA1EN;
/* Configure I2Cx: Own Address1 and ack own address1 mode */
if (hi2c->Init.AddressingMode == I2C_ADDRESSINGMODE_7BIT)
{
hi2c->Instance->OAR1 = (I2C_OAR1_OA1EN | hi2c->Init.OwnAddress1);
}
else /* I2C_ADDRESSINGMODE_10BIT */
{
hi2c->Instance->OAR1 = (I2C_OAR1_OA1EN | I2C_OAR1_OA1MODE | hi2c->Init.OwnAddress1);
}
/*---------------------------- I2Cx CR2 Configuration ----------------------*/
/* Configure I2Cx: Addressing Master mode */
if (hi2c->Init.AddressingMode == I2C_ADDRESSINGMODE_10BIT)
{
hi2c->Instance->CR2 = (I2C_CR2_ADD10);
}
/* Enable the AUTOEND by default, and enable NACK (should be disable only during Slave process */
hi2c->Instance->CR2 |= (I2C_CR2_AUTOEND | I2C_CR2_NACK);
/*---------------------------- I2Cx OAR2 Configuration ---------------------*/
/* Disable Own Address2 before set the Own Address2 configuration */
hi2c->Instance->OAR2 &= ~I2C_DUALADDRESS_ENABLE;
/* Configure I2Cx: Dual mode and Own Address2 */
hi2c->Instance->OAR2 = (hi2c->Init.DualAddressMode | hi2c->Init.OwnAddress2 | (hi2c->Init.OwnAddress2Masks << 8));
/*---------------------------- I2Cx CR1 Configuration ----------------------*/
/* Configure I2Cx: Generalcall and NoStretch mode */
hi2c->Instance->CR1 = (hi2c->Init.GeneralCallMode | hi2c->Init.NoStretchMode);
/* Enable the selected I2C peripheral */
__HAL_I2C_ENABLE(hi2c);
hi2c->ErrorCode = HAL_I2C_ERROR_NONE;
hi2c->State = HAL_I2C_STATE_READY;
hi2c->PreviousState = I2C_STATE_NONE;
hi2c->Mode = HAL_I2C_MODE_NONE;
return HAL_OK;
}
_________
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(hi2c->Instance==I2C1)
{
/* USER CODE BEGIN I2C1_MspInit 0 */
/* USER CODE END I2C1_MspInit 0 */
__HAL_RCC_GPIOB_CLK_ENABLE();
/**I2C1 GPIO Configuration
PB9 ------> I2C1_SDA
PB8 ------> I2C1_SCL
*/
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* Peripheral clock enable */
__HAL_RCC_I2C1_CLK_ENABLE();
/* USER CODE BEGIN I2C1_MspInit 1 */
/* USER CODE END I2C1_MspInit 1 */
}
}
PS：我在这个发现板上尝试过传感器的mbed示例，它可以正常工作。
我不熟悉STM32L0。但我查看了我的STM32L4示例。在我的L4 I2C示例中，代码中缺少的一件事是在HAL_I2C_MspInit()中配置I2C时钟源
/*##-1- Configure the I2C clock source. The clock is derived from the SYSCLK #*/
RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_I2Cx;
RCC_PeriphCLKInitStruct.I2c3ClockSelection = RCC_I2CxCLKSOURCE_SYSCLK;
HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
如果这不适用或没有帮助，那么我建议你下载STM32CubeL0软件包，其中应该包含一个I2C示例，甚至可能适用于您的特定电路板。
谢谢大家的帮助。
我发现我的代码有什么问题。
在STM32L0xx_hal_msp.c文件中有一个名为void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)的函数在此函数中，声明了SCL和SDA引脚
__HAL_RCC_GPIOB_CLK_ENABLE();
/**I2C1 GPIO Configuration
PB9 ------> I2C1_SDA
PB8 ------> I2C1_SCL
*/
GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; // standard GPIO_MODE_AF_OD => GPIO_MODE_AF_PP (open drain mode to push pull mode )
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* Peripheral clock enable */
__HAL_RCC_I2C1_CLK_ENABLE();
更改引脚的模式解决了问题。