Posted on March 23, 2018 at 11:46Hello,
I am trying to use the character LCD with I2C expander together with BluePill bard (STM32F103C8T6).
I have the Makefile project generated by STM32CubeMX (latest 4.25).
Because LCD was not working (not initialized) I am trying to find if I2C interface is OK.
So I have added the following lines to the main.c (2 short blinks with LED connected to PC13 pin when I2C is not ready - tested approx every 2 sec):
/* USER CODE BEGIN 2 */
while (HAL_I2C_IsDeviceReady (&hi2c1, 0x27, 5, 1000) != HAL_OK) {
HAL_GPIO_WritePin (PC13_LED_GPIO_Port, PC13_LED_Pin, 1);
HAL_Delay (200);
HAL_GPIO_WritePin (PC13_LED_GPIO_Port, PC13_LED_Pin, 0);
HAL_Delay (10);
HAL_GPIO_WritePin (PC13_LED_GPIO_Port, PC13_LED_Pin, 1);
HAL_Delay (200);
HAL_GPIO_WritePin (PC13_LED_GPIO_Port, PC13_LED_Pin, 0);
HAL_Delay (10);
HAL_GPIO_WritePin (PC13_LED_GPIO_Port, PC13_LED_Pin, 1);
HAL_Delay (1500);
}
And yes, LED is blinking - so it means I2C is not ready.
What I need to do to have the I2C working?
Hardware and I2C address 0x27 is correct, because the Arduino STM32 project using LiquidCrystal_i2c library is working.
Complete project attached.
Versions used: STM32CubeMX 4.25, STM32Cube fw F1 1.6.1
Thanks and regards
Jan
#i2c #stm32cubemx-4.25 #makefile #stm32cubef1
