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AN4655 데이터시트(PDF) 17 Page - STMicroelectronics

부품명 AN4655
상세설명  Virtually increasing the number of serial communication peripherals in STM32 applications
PDF  21 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4655 데이터시트(HTML) 17 Page - STMicroelectronics

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 17 / 21 page
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DocID027483 Rev 1
17/21
AN4655
SW methods
20
/**
* @brief I2C master read 8-bit bit-bang
* @param unsigned char ack – acknowledgement control
* @retval unsigned char b – data received
*/
unsigned char I2C_master_read (unsigned char ack)
{
unsigned char msk = 0x80;
unsigned char b = 0;
do
{
i2c_set_scl();
half_bit_dly();
sda_rd_control(b);
i2c_clear_scl();
half_bit_dly();
}
while ((msk>>=1) != 0);
if(ack != 0)
{
i2c_clear_sda();/* ACK slot control */
}
setup_dly();
i2c_set_scl();
half_bit_dly();
i2c_clear_scl();
half_bit_dly();
return (b);
}
/**
* @brief I2C start
* @param none
* @retval none
*/
void I2C_Start_condition(void)
{
i2c_bus_init();
half_bit_dly();
i2c_clear_sda();
half_bit_dly();
i2c_clear_scl()



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