Программирование ARM

hg clone http://hg.code.sf.net/p/ircontroller/code

void i2c_init() {
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
	
	GPIO_InitTypeDef pin;
	GPIO_StructInit(&pin);
	pin.GPIO_Pin = GPIO_Pin_6;
	pin.GPIO_Mode = GPIO_Mode_AF_OD;
	
	pin.GPIO_Speed = GPIO_Speed_2MHz;
	GPIO_Init(GPIOB, &pin);
	pin.GPIO_Pin = GPIO_Pin_7;
	GPIO_Init(GPIOB, &pin);
	
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
	//GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
	I2C_InitTypeDef i2c;
	i2c.I2C_ClockSpeed = 400000;
	i2c.I2C_Mode = I2C_Mode_I2C; 
	i2c.I2C_DutyCycle = I2C_DutyCycle_2;
	i2c.I2C_OwnAddress1 = 0;
	i2c.I2C_Ack = I2C_Ack_Disable;
	i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
	I2C_Init(I2C1, &i2c);
	I2C_Cmd(I2C1, ENABLE);
}

void i2c_start(uint8_t addr) {
	while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
	I2C_GenerateSTART(I2C1, ENABLE);
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
	I2C_Send7bitAddress(I2C1, addr & ~1, (addr & 1) ? I2C_Direction_Receiver : I2C_Direction_Transmitter);
	if (addr & 1) {
		while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
	} else {
		while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
	}
}

void i2c_stop() {
	I2C_GenerateSTOP(I2C1, ENABLE);
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

void i2c_write(uint8_t data) {
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING));
	I2C_SendData(I2C1, data);
}

uint8_t i2c_read(uint8_t ack) {
	if (ack) {
		I2C_AcknowledgeConfig(I2C1, ENABLE);
	} else {
		I2C_AcknowledgeConfig(I2C1, DISABLE);
		I2C_GenerateSTOP(I2C1, ENABLE);
	}
	while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
	uint8_t data = I2C_ReceiveData(I2C1);
	return data;
}