请教下,使用 hal 的库函数进行 I2C器件的 AT24C1024 器件的读写,这个读写地址 需要24位,而 hal 库最大支持 16位,那么是不是需要人为的进行修改 这个读写地址 才行 ???
/**
* @brief Master sends target device address followed by internal memory address for write request.
* @param hi2c: pointer to a I2C_HandleTypeDef structure that contains
* the configura
tion information for I2C module
* @param DevAddress: Target device address
* @param MemAddress: Internal memory address 此处的地址范围 是16, ?????????????
* @param MemAddSize: Size of internal memory address
* @param Timeout: Timeout duration
* @retval HAL status
*/
static HAL_StatusTypeDef I2C_RequestMemoryWrite(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint32_t Timeout)
{
/* Generate Start */
hi2c->Instance->CR1 |= I2C_CR1_START;
/* Wait until SB flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_SB, RESET, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Send slave address */
hi2c->Instance->DR = I2C_7BIT_ADD_WRITE(DevAddress);
/* Wait until ADDR flag is set */
if(I2C_WaitOnMasterAddressFlagUntilTimeout(hi2c, I2C_FLAG_ADDR, Timeout) != HAL_OK)
{
if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
return HAL_ERROR;
}
else
{
return HAL_TIMEOUT;
}
}
/* Clear ADDR flag */
__HAL_I2C_CLEAR_ADDRFLAG(hi2c);
/* Wait until TXE flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TXE, RESET, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* If Memory address size is 8Bit */
if(MemAddSize == I2C_MEMADD_SIZE_8BIT)
{
/* Send Memory Address */
hi2c->Instance->DR = I2C_MEM_ADD_LSB(MemAddress);
}
/* If Memory address size is 16Bit */
else
{
/* Send MSB of Memory Address */
hi2c->Instance->DR = I2C_MEM_ADD_MSB(MemAddress);
/* Wait until TXE flag is set */
if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TXE, RESET, Timeout) != HAL_OK)
{
return HAL_TIMEOUT;
}
/* Send LSB of Memory Address */
hi2c->Instance->DR = I2C_MEM_ADD_LSB(MemAddress);
}
return HAL_OK;
}
start bit+device address+byte address.
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