我调试 I3C 相关代码，但是读取操作一直失败；读到的缓冲区全部都是 255，同时读出的温度值显示为 350 摄氏度。现在已经有点束手无策了。
奇怪的是，我自己写的几项状态检测是可以正常执行的；看起来从机地址分配这一步是成功的。如果我不插上传感器扩展板运行代码，这些检测逻辑就会导致死机。
这份代码是我参考两份 I3C 示例整合出来的。针对 H503‑Nucleo 开发板，ST 并没有提供 IKS4A1 的配套例程；
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* MPU Configuration--------------------------------------------------------*/
MPU_Config();
/* 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_I3C1_Init();
MX_ICACHE_Init();
/* USER CODE BEGIN 2 */
if (HAL_I3C_Ctrl_DynAddrAssign_IT(&hi3c1, I3C_RSTDAA_THEN_ENTDAA) != HAL_OK)
{
Error_Handler();
}
// new for finding
while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY) { }
while (HAL_I3C_Ctrl_IsDeviceI3C_Ready(&hi3c1, 0x32, 300, 1000) != HAL_OK) { }
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.pBuffer = aControlBuffer;
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.Size = 1;
aContextBuffers[I3C_IDX_FRAME_1].TxBuf.pBuffer = aTxBuffer;
aContextBuffers[I3C_IDX_FRAME_1].TxBuf.Size = LSM6DSV16XCONFIGSIZE;
/*##- Add context buffer transmit in Frame context #####################*/
if (HAL_I3C_AddDescToFrame(&hi3c1,
NULL,
&aPrivateDescriptorConfig[I3C_IDX_FRAME_1],
&aContextBuffers[I3C_IDX_FRAME_1],
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.Size,
I3C_PRIVATE_WITH_ARB_STOP) != HAL_OK)
{
Error_Handler();
}
if (HAL_I3C_Ctrl_Transmit_IT(&hi3c1, &aContextBuffers[I3C_IDX_FRAME_1]) != HAL_OK)
{
Error_Handler();
}
while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY)
{
}
/* USER CODE END 2 */
/* Initialize led */
BSP_LED_Init(LED_GREEN);
/* Initialize USER push-button, will be used to trigger an interrupt each time it's pressed.*/
BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
/* Initialize COM1 port (115200, 8 bits (7-bit data + 1 stop bit), no parity */
BspCOMInit.BaudRate = 115200;
BspCOMInit.WordLength = COM_WORDLENGTH_8B;
BspCOMInit.StopBits = COM_STOPBITS_1;
BspCOMInit.Parity = COM_PARITY_NONE;
BspCOMInit.HwFlowCtl = COM_HWCONTROL_NONE;
if (BSP_COM_Init(COM1, &BspCOMInit) != BSP_ERROR_NONE)
{
Error_Handler();
}
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.pBuffer = aControlBuffer;
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.Size = 2;
aContextBuffers[I3C_IDX_FRAME_1].TxBuf.pBuffer = aTxBuffer;
aContextBuffers[I3C_IDX_FRAME_1].TxBuf.Size = LSM6DSV16XDATASIZE;
aContextBuffers[I3C_IDX_FRAME_1].RxBuf.pBuffer = aRxBuffer;
aContextBuffers[I3C_IDX_FRAME_1].RxBuf.Size = RXBUFFERSIZE;
if (HAL_I3C_AddDescToFrame(&hi3c1,
NULL,
&aPrivateDescriptor[I3C_IDX_FRAME_1],
&aContextBuffers[I3C_IDX_FRAME_1],
aContextBuffers[I3C_IDX_FRAME_1].CtrlBuf.Size,
I3C_PRIVATE_WITH_ARB_RESTART) != HAL_OK)
{
Error_Handler();
}
if (HAL_I3C_Ctrl_MultipleTransfer_IT(&hi3c1, &aContextBuffers[I3C_IDX_FRAME_1]) != HAL_OK)
{
Error_Handler();
}
while (HAL_I3C_GetState(&hi3c1) != HAL_I3C_STATE_READY) { }
#define TEMP_OFFSET 25 /* Temperature offset is 25 degree celsius, mean Temperature value 0 correspond to 25 Celsius degree */
int16_t Temperature = 0;
Temperature = TEMP_OFFSET + (((int16_t)(((int16_t)aRxBuffer[1] * 256) + (int16_t)aRxBuffer[0])) / 100);
printf("\n\r----------------LSM6DSV16X Measurement----------------\n\r");
printf("Temperature (Celsius degree): %d \n\r", Temperature);
}
/* USER CODE END 3 */
}
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