请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
器件型号：TMS570LC4357 主题中讨论的其他器件：HALCOGEN
工具与软件：
在 Halcogen I2C 驱动程序代码中，i2cSend ()
void i2cSend(i2cBASE_t *i2c, uint32 length, uint8 * data)
{
uint32 index = i2c == i2cREG1 ? 0U : 1U;
/* USER CODE BEGIN (17) */
/* USER CODE END */
if ((g_i2cTransfer_t[index].mode & (uint32)I2C_TX_INT) != 0U)
{
/* we are in interrupt mode */
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
g_i2cTransfer_t[index].data = data;
/* start transmit by sending first byte */
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
i2c->DXR = (uint32)*g_i2cTransfer_t[index].data;
/*SAFETYMCUSW 45 D MR:21.1 <APPROVED> "Valid non NULL input parameters are only allowed in this driver" */
g_i2cTransfer_t[index].data++;
/* Length -1 since one data is written already */
g_i2cTransfer_t[index].length = (length - 1U);
/* Enable Transmit Interrupt */
i2c->IMR |= (uint32)I2C_TX_INT;
}
else
{
/* send the data */
/* snipped */
}
/* USER CODE BEGIN (18) */
/* USER CODE END */
}
请注意：
g_i2cTransfer_t[index].length =(length - 1u)；
然后、在 ISR 中：
case 5U:
/* USER CODE BEGIN (42) */
/* USER CODE END */
/* transmit */
/*SAFETYMCUSW 30 S MR:12.2,12.3 <APPROVED> "Used for data count in Transmit/Receive polling and Interrupt mode" */
if (g_i2cTransfer_t[0U].length > 0U)
{
i2cREG1->DXR = (uint32) *g_i2cTransfer_t[0U].data;
/*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
g_i2cTransfer_t[0U].data++;
g_i2cTransfer_t[0U].length--;
if(g_i2cTransfer_t[0U].length == 0U)
{ /* Disable TX interrupt after desired data count transfered*/
i2cREG1->IMR &= (uint32)(~(uint32)I2C_TX_INT);
i2cNotification(i2cREG1, (uint32)I2C_TX_INT);
}
}
break;
请注意：
如果(g_i2cTransfer_t[0U].length > 0u)
因此,如果您发送1个字节,当 Tx 完成中断触发时,将不会调用 i2cNotification ()。
这没有太大帮助。
