I have added the code written in HAL for I2C communication between I2C 2 of STM32L053R8T6 and LIs3dh accelerometer to receive whoami register. doesn't seem to be able to receive any data from the accelerometer.
#include "stm32l0xx.h"
#include "stm32l0xx_hal_rcc.h"
#include "stm32l0xx_hal_gpio.h"
#include "stm32l0xx_hal_i2c.h"
#include "stdio.h"
#define lis3dh_address 0x19 //0x18 if sd0 connected to ground //0x19 if sd0 connected to power supply
#define who_am_i 0x0F
#define BUFFERSIZE 1
uint8_t aRxBuffer[BUFFERSIZE];
__IO uint16_t hTxNumData = 0;
__IO uint16_t hRxNumData = 0;
uint8_t bTransferRequest = 0;
int i2c2_gpio_init(void);
int i2c2_init(void);
GPIO_InitTypeDef gpiob;
I2C_HandleTypeDef i2c2;
int main(void)
{
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_I2C2_CLK_ENABLE();
while(1)
{
i2c2_gpio_init();
i2c2_init();
hRxNumData=BUFFERSIZE;
HAL_I2C_Mem_Read(&i2c2,(uint16_t)lis3dh_address,(uint16_t)who_am_i,1,(uint8_t*) aRxBuffer,hRxNumData,((uint32_t)25));
uint8_t a= aRxBuffer[BUFFERSIZE-1];
printf("%d",(uint8_t)a);
}
}
int i2c2_gpio_init(void)
{
gpiob.Pin = GPIO_PIN_13 |GPIO_PIN_14;
gpiob.Mode = GPIO_MODE_AF_OD;
gpiob.Pull = GPIO_PULLUP;
gpiob.Speed = GPIO_SPEED_FAST;
gpiob.Alternate = GPIO_AF5_I2C2;
HAL_GPIO_Init(GPIOB, &gpiob);
return 0;
}
int i2c2_init(void)
{
i2c2.Instance = I2C2;
i2c2.Init.Timing = 0x10420F13; i2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
i2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
i2c2.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
i2c2.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
i2c2.Init.OwnAddress1 = 0;
i2c2.Init.OwnAddress2 = 0;
HAL_I2C_Init(&i2c2);
return 0;
}
