[STM32F373 EVM] I2C 테스트 - 9축 IMU 센서 테스트
[STM32F373 EVM]에는 I2C가 PB8(SCL), PB9(SDA)에 할당되어 있다. I2C테스트를 위해 9축 IMU센서(BNO055 EVM)의 롤,피치 값을 TFT LCD에 표시하는 예제를 작성해 보았다.
PB8 -> SPI2_SCK/I2S2_CK,I2C1_SCL, USART3_TX,CAN_RX, CEC, TIM16_CH1,TIM4_CH3, TIM19_CH3,COMP1_OUT, TSC_SYNC
PB9 -> SPI2_NSS/I2S2_WS,I2C1_SDA, USART3_RX,CAN_TX, IR_OUT,TIM17_CH1, TIM4_CH4,TIM19_CH4, COMP2_OUT
STM32F373 I2C 초기화 함수
#define I2Cx I2C1
#define I2Cx_CLK_ENABLE() __I2C1_CLK_ENABLE()
#define I2Cx_SDA_GPIO_CLK_ENABLE() __GPIOB_CLK_ENABLE()
#define I2Cx_SCL_GPIO_CLK_ENABLE() __GPIOB_CLK_ENABLE()
#define I2Cx_FORCE_RESET() __I2C1_FORCE_RESET()
#define I2Cx_RELEASE_RESET() __I2C1_RELEASE_RESET()
//Definition for I2Cx Pins
#define I2Cx_SCL_PIN GPIO_PIN_8
#define I2Cx_SCL_GPIO_PORT GPIOB
#define I2Cx_SCL_AF GPIO_AF4_I2C1
#define I2Cx_SDA_PIN GPIO_PIN_9
#define I2Cx_SDA_GPIO_PORT GPIOB
#define I2Cx_SDA_AF GPIO_AF4_I2C1
void BNO055_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
/*##-1- Enable peripherals and GPIO Clocks #################################*/
/* Enable GPIO TX/RX clock */
I2Cx_SCL_GPIO_CLK_ENABLE();
I2Cx_SDA_GPIO_CLK_ENABLE();
/* Enable I2C1 clock */
I2Cx_CLK_ENABLE();
/*##-2- Configure peripheral GPIO ##########################################*/
/* I2C TX GPIO pin configuration */
GPIO_InitStruct.Pin = I2Cx_SCL_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = I2Cx_SCL_AF;
HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);
/* I2C RX GPIO pin configuration */
GPIO_InitStruct.Pin = I2Cx_SDA_PIN;
GPIO_InitStruct.Alternate = I2Cx_SDA_AF;
HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);
I2cHandle.Instance = I2Cx;
I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
I2cHandle.Init.Timing = 400000;
I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
//I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_2;
I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_ENABLED;
I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
I2cHandle.Init.OwnAddress1 = 0xFE;
I2cHandle.Init.OwnAddress2 = 0xFE;
HAL_I2C_Init(&I2cHandle);
}
STM32F373 I2C 송수신 함수
unsigned char read8(unsigned char addr, unsigned char data)
{
unsigned char tx_buf[2];
unsigned char rx_buf[4];
tx_buf[0] = data;
while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)addr, (uint8_t*)tx_buf, 1, 10000)!= HAL_OK)
{
}
while(HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)addr, (uint8_t *)rx_buf, 1, 10000) != HAL_OK)
{
}
result = rx_buf[0];
}
void write8(unsigned char addr, unsigned char reg, unsigned char data)
{
unsigned char tx_buf[2];
tx_buf[0] = reg;
tx_buf[1] = data;
while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)addr, (uint8_t*)tx_buf, 2, 10000)!= HAL_OK)
{
}
}
STM32F373 I2C 테스트 동영상
