rt_err_t at91_i2c_init(void)
{
struct rt_i2c_bus_device *bus;
bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
if (bus == RT_NULL)
{
rt_kprintf("rt_malloc failed\n");
return -RT_ENOMEM;
}
rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));
bus->priv = (void *)&bit_ops;
at91_i2c_gpio_init();
rt_i2c_bit_add_bus(bus, "i2c0");
return RT_EOK;
}
void rt_hw_i2c_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_I2C_SCL | RCC_I2C_SDA , ENABLE );
GPIO_InitStructure.GPIO_Pin = PIN_I2C_SCL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIO_PORT_I2C_SCL, &GPIO_InitStructure);
GPIO_SetBits(GPIO_PORT_I2C_SCL, PIN_I2C_SCL);
GPIO_InitStructure.GPIO_Pin = PIN_I2C_SDA;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIO_PORT_I2C_SDA, &GPIO_InitStructure);
GPIO_SetBits(GPIO_PORT_I2C_SDA, PIN_I2C_SDA);
rt_memset((void *)&i2c_device, 0, sizeof(struct rt_i2c_bus_device));
i2c_device.priv = (void *)&bit_ops;
rt_i2c_bit_add_bus(&i2c_device, "i2c1");
}
int rt_hw_i2c_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#ifdef RT_USING_I2C_BITOPS
RCC_AHB1PeriphClockCmd(RCC_I2C_SCL | RCC_I2C_SDA, ENABLE);
/* config SCL PIN */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Pin = PIN_I2C_SCL;
GPIO_SetBits(GPIO_PORT_I2C_SCL, PIN_I2C_SCL);
GPIO_Init(GPIO_PORT_I2C_SCL, &GPIO_InitStructure);
/* config SDA PIN */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Pin = PIN_I2C_SDA;
GPIO_SetBits(GPIO_PORT_I2C_SDA, PIN_I2C_SDA);
GPIO_Init(GPIO_PORT_I2C_SDA, &GPIO_InitStructure);
rt_memset((void *)&i2c_device, 0, sizeof(struct rt_i2c_bus_device));
i2c_device.priv = (void *)&bit_ops;
rt_i2c_bit_add_bus(&i2c_device, "i2c1");
#else
I2C_InitTypeDef I2C_InitStructure;
/*!< sEE_I2C Periph clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
/*!< sEE_I2C_SCL_GPIO_CLK and sEE_I2C_SDA_GPIO_CLK Periph clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Reset sEE_I2C IP */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
/* Release reset signal of sEE_I2C IP */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
/*!< GPIO configuration */
/*!< Configure sEE_I2C pins: SCL */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*!< Configure sEE_I2C pins: SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect PXx to I2C_SCL*/
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
/* Connect PXx to I2C_SDA*/
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
/*!< I2C configuration */
/* sEE_I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
// I2C_InitStructure.I2C_OwnAddress1 = SLA_ADDRESS;
I2C_InitStructure.I2C_OwnAddress1 = 0x18;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 400000;
/* Apply sEE_I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
/* sEE_I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
rt_memset((void *)&stm32_i2c1, 0, sizeof(struct rt_i2c_bus_device));
stm32_i2c1.ops = &i2c1_ops;
rt_i2c_bus_device_register(&stm32_i2c1, "i2c1");
#endif
return 0;
}
