187 lines
4.6 KiB
C++
187 lines
4.6 KiB
C++
#include "Kernel\Sys.h"
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#include "Device\I2C.h"
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#include "Platform\stm32.h"
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void HardI2C::OnInit()
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{
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I2C_TypeDef* g_I2Cs[] = I2CS;
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assert(_index < ArrayLength(g_I2Cs), "I2C::Init");
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_IIC = g_I2Cs[_index];
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SCL.OpenDrain = true;
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SDA.OpenDrain = true;
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Pin pins[][2] = I2C_PINS;
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SCL.Set(pins[_index][0]);
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SDA.Set(pins[_index][1]);
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}
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void HardI2C::OnOpen()
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{
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 << _index, ENABLE);
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#ifdef STM32F0
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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#endif
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//RCC_APB1PeriphResetCmd(sEE_I2C_CLK, ENABLE);
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//RCC_APB1PeriphResetCmd(sEE_I2C_CLK, DISABLE);
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#ifdef STM32F0
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// 都在GPIO_AF_0分组内
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SCL.AFConfig(Port::AF_0);
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SDA.AFConfig(Port::AF_0);
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#elif defined(STM32F4)
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byte afs[] = { GPIO_AF_I2C1, GPIO_AF_I2C2, GPIO_AF_I2C3 };
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SCL.AFConfig((Port::GPIO_AF)afs[_index]);
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SDA.AFConfig((Port::GPIO_AF)afs[_index]);
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#endif
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SCL.Open();
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SDA.Open();
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auto iic = (I2C_TypeDef*)_IIC;
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I2C_InitTypeDef i2c;
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I2C_StructInit(&i2c);
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I2C_DeInit(iic); // 复位
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// I2C_Timing
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// I2C_AnalogFilter
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// I2C_DigitalFilter
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// I2C_Mode
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// I2C_OwnAddress1
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// I2C_Ack
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// I2C_AcknowledgedAddress
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/*i2c.I2C_AnalogFilter = I2C_AnalogFilter_Disable; // 关闭滤波器
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// i2c.I2C_DigitalFilter // 数字滤波器 不知道怎么设置 跟 cr1 的8-11位有关
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i2c.I2C_Mode =I2C_Mode_I2C; // IIC 模式
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// i2c.I2C_OwnAddress1
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i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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if(addressLen == ADDR_LEN_10)
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i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_10bit;*/
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i2c.I2C_Mode = I2C_Mode_I2C; //设置I2C接口模式
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#ifndef STM32F0
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i2c.I2C_DutyCycle = I2C_DutyCycle_2; //设置I2C接口的高低电平周期
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#endif
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i2c.I2C_OwnAddress1 = Address; //设置I2C接口的主机地址。从设备需要设定的主机地址，而对于主机而言这里无所谓
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i2c.I2C_Ack = I2C_Ack_Enable; //设置是否开启ACK响应
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i2c.I2C_ClockSpeed = Speed; //速度
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if(Address > 0xFF)
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i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_10bit;
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else
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i2c.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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I2C_Cmd(iic, ENABLE);
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I2C_Init(iic, &i2c);
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}
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void HardI2C::OnClose()
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{
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auto iic = (I2C_TypeDef*)_IIC;
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// sEE_I2C Peripheral Disable
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I2C_Cmd(iic, DISABLE);
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// sEE_I2C DeInit
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I2C_DeInit(iic);
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// sEE_I2C Periph clock disable
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 << _index, DISABLE);
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SCL.Close();
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SDA.Close();
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}
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void HardI2C::Start()
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{
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auto iic = (I2C_TypeDef*)_IIC;
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// 允许1字节1应答模式
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I2C_AcknowledgeConfig(iic, ENABLE);
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I2C_GenerateSTART(iic, ENABLE);
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_Event = I2C_EVENT_MASTER_MODE_SELECT;
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WaitAck();
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}
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void HardI2C::Stop()
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{
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auto iic = (I2C_TypeDef*)_IIC;
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// 最后一位后要关闭应答
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I2C_AcknowledgeConfig(iic, DISABLE);
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// 产生结束信号
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I2C_GenerateSTOP(iic, ENABLE);
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}
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void HardI2C::Ack(bool ack)
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{
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I2C_AcknowledgeConfig((I2C_TypeDef*)_IIC, ack ? ENABLE : DISABLE);
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}
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bool HardI2C::WaitAck(int retry)
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{
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if(!retry) retry = Retry;
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while(!I2C_CheckEvent((I2C_TypeDef*)_IIC, _Event))
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{
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if(--retry <= 0) return ++Error; // 超时处理
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}
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return retry > 0;
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}
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bool HardI2C::SendAddress(int addr, bool tx)
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{
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auto iic = (I2C_TypeDef*)_IIC;
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if(tx)
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{
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// 向设备发送设备地址
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I2C_Send7bitAddress(iic, Address, I2C_Direction_Transmitter);
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_Event = I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED;
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if(!WaitAck()) return false;
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_Event = I2C_EVENT_MASTER_BYTE_TRANSMITTED;
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return I2C::SendSubAddr(addr);
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}
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else
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{
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// 如果有子地址，需要先发送子地址。而子地址作为数据发送，需要首先设置为发送模式
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if(SubWidth > 0)
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{
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if(!SendAddress(addr, true)) return false;
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// 重启会话
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Start();
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}
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// 发送读地址
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I2C_Send7bitAddress(iic, Address, I2C_Direction_Receiver);
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_Event = I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED;
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if(!WaitAck()) return false;
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return true;
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}
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}
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void HardI2C::WriteByte(byte dat)
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{
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_Event = I2C_EVENT_MASTER_BYTE_TRANSMITTED;
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I2C_SendData((I2C_TypeDef*)_IIC, dat);
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}
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byte HardI2C::ReadByte()
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{
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_Event = I2C_EVENT_MASTER_BYTE_RECEIVED;
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return I2C_ReceiveData((I2C_TypeDef*)_IIC);
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}
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/*
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SDA 和SCL 都是双向线路都通过一个电流源或上拉电阻连接到正的电源电压。
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当总线空闲时这两条线路都是高电平。
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SDA 线上的数据必须在时钟的高电平周期保持稳定。
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数据线的高或低电平状态只有在SCL线的时钟信号是低电平时才能改变。
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起始和停止例外，因此从机很容易区分起始和停止信号。
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*/
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