Hi every one. I am using STM32-F401RE, 2x16 LCD with I2C integrate, i connect SCL-SDA-Vcc and GND each other (board and LCD), i tried to make scann program to know adress of LCD in this way:
#include "main.h"
#include "stdio.h"
I2C_HandleTypeDef hi2c1;
UART_HandleTypeDef huart1;
uint8_t Buffer[25] = {0};
uint8_t Space[] = " - ";
uint8_t StartMSG[] = "Starting I2C Scanning: \r\n";
uint8_t EndMSG[] = "Done! \r\n\r\n";
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART1_UART_Init(void);
int main(void)
{
uint8_t i = 0, ret;
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_I2C1_Init();
MX_USART1_UART_Init();
HAL_Delay(1000);
/*-[ I2C Bus Scanning ]-*/
HAL_UART_Transmit(&huart1, StartMSG, sizeof(StartMSG), 10000);
for(i=1; i<128; i++)
{
ret = HAL_I2C_IsDeviceReady(&hi2c1, (uint16_t)(i<<1), 3, 5);
if (ret != HAL_OK) /* No ACK Received At That Address */
{
HAL_UART_Transmit(&huart1, Space, sizeof(Space), 10000);
}
else if(ret == HAL_OK)
{
sprintf(Buffer, "0x%X", i);
HAL_UART_Transmit(&huart1, Buffer, sizeof(Buffer), 10000);
}
}
HAL_UART_Transmit(&huart1, EndMSG, sizeof(EndMSG), 10000);
/*--[ Scanning Done ]--*/
while (1)
{
}
}
but no adress i saw. If i use LCD with Arduino Mega board i am able to see the 0x27 adress of LCD. I used also all the pins avaiable on F401RE board for SCL and SDA comunication but never i see the adress of LCD.
Have some one idea how i can get it(adress of LCD)?
