The I2C protocol, by design, includes an address byte as part of the communication specification. For devices like the TM1637, you can simulate I2C communication without the address byte by simply using bit-banging or custom protocol handling. The STM32's HAL library is not designed to support a "no address byte"
Why don't you write you own library to communicate over GPIO and call it whatever you want, for example I2C_modified.c I2C_modified.h
void tm1637_send_bit(uint8_t bit) {
if (bit) {
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_SET); // Set DIO to 1
} else {
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_RESET); // Set DIO to 0
}
// Generate clock pulse
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_SET); // Set CLK to 1
delay_us(5); // Small delay for clock timing
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_RESET); // Set CLK to 0
delay_us(5); // Small delay for clock timing
}
void tm1637_send_byte(uint8_t byte) {
for (int i = 0; i < 8; i++) {
tm1637_send_bit((byte >> i) & 1); // Send each bit of the byte
}
}
void tm1637_send_start(void) {
// Generate the start condition (data high, clock high, then clock low, data low)
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_SET);
delay_us(5);
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_RESET);
delay_us(5);
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_RESET);
}
void tm1637_send_stop(void) {
// Generate the stop condition (data low, clock high, then clock low, data high)
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_SET);
delay_us(5);
HAL_GPIO_WritePin(GPIO_PORT, CLK_PIN, GPIO_PIN_RESET);
delay_us(5);
HAL_GPIO_WritePin(GPIO_PORT, DIO_PIN, GPIO_PIN_SET);
}
