STM32 GPIO 模拟 SMI[MDC/MDIO] 协议代码实现 - 使用 STM32 实现 SMI 协议

#include "stm32f10x.h"

// \u5b9a\u4e49SMI\u76f8\u5173\u7684GPIO\u5f15\u811a #define SMI_MDC_PIN GPIO_Pin_0 #define SMI_MDC_PORT GPIOA #define SMI_MDIO_PIN GPIO_Pin_1 #define SMI_MDIO_PORT GPIOA

// \u521d\u59cb\u5316SMI GPIO\u5f15\u811a void SMI_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStructure;

// \u542f\u7528GPIOA\u65f6\u949f
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

// \u914d\u7f6eSMI_MDC\u5f15\u811a\u4e3a\u63a8\u653e\u51fa\u529b
GPIO_InitStructure.GPIO_Pin = SMI_MDC_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(SMI_MDC_PORT, &GPIO_InitStructure);

// \u914d\u7f6eSMI_MDIO\u5f15\u811a\u4e3a\u5f00\u6f0f\u51fa\u529b
GPIO_InitStructure.GPIO_Pin = SMI_MDIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(SMI_MDIO_PORT, &GPIO_InitStructure);

}

// \u53d1\u9001\u4e00\u4e2aSMI\u5f00\u59cb\u4f4d void SMI_SendStartBit(void) { // \u8bbe\u7f6eMDC\u4e3a\u9ad8\u7535\u5e73 GPIO_SetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u8bbe\u7f6eMDIO\u4e3a\u9ad8\u7535\u5e73 GPIO_SetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); // \u8bbe\u7f6eMDIO\u4e3a\u4f4e\u7535\u5e73 GPIO_ResetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); // \u8bbe\u7f6eMDC\u4e3a\u4f4e\u7535\u5e73 GPIO_ResetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); }

// \u53d1\u9001\u4e00\u4e2aSMI\u7ed3\u675f\u4f4d void SMI_SendStopBit(void) { // \u8bbe\u7f6eMDC\u4e3a\u9ad8\u7535\u5e73 GPIO_SetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u8bbe\u7f6eMDIO\u4e3a\u4f4e\u7535\u5e73 GPIO_ResetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); // \u8bbe\u7f6eMDIO\u4e3a\u9ad8\u7535\u5e73 GPIO_SetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); // \u8bbe\u7f6eMDC\u4e3a\u4f4e\u7535\u5e73 GPIO_ResetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); }

// \u53d1\u9001\u4e00\u4e2aSMI\u6570\u636e\u4f4d void SMI_SendDataBit(uint8_t bit) { // \u8bbe\u7f6eMDC\u4e3a\u9ad8\u7535\u5e73 GPIO_SetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u8bbe\u7f6eMDIO\u4e3a\u6570\u636e if (bit == 0) { GPIO_ResetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); } else { GPIO_SetBits(SMI_MDIO_PORT, SMI_MDIO_PIN); } // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); // \u8bbe\u7f6eMDC\u4e3a\u4f4e\u7535\u5e73 GPIO_ResetBits(SMI_MDC_PORT, SMI_MDC_PIN); // \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4 delay_us(10); }

// \u53d1\u9001\u4e00\u4e2aSMI\u6570\u636e\u5b57\u8282 void SMI_SendDataByte(uint8_t data) { uint8_t i;

// \u53d1\u9001\u6570\u636e\u7684\u6700\u9ad8\u4f4d\u5230\u6700\u4f4e\u4f4d
for (i = 0; i < 8; i++) {
    SMI_SendDataBit((data >> (7 - i)) & 0x01);
}

}

// \u4eceSMI\u4e2d\u63a5\u6536\u4e00\u4e2a\u6570\u636e\u4f4d uint8_t SMI_ReceiveDataBit(void) { uint8_t bit;

// \u8bbe\u7f6eMDC\u4e3a\u9ad8\u7535\u5e73
GPIO_SetBits(SMI_MDC_PORT, SMI_MDC_PIN);
// \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4
delay_us(10);
// \u8bfb\u53d6MDIO\u7684\u7535\u5e73
bit = GPIO_ReadInputDataBit(SMI_MDIO_PORT, SMI_MDIO_PIN);
// \u8bbe\u7f6eMDC\u4e3a\u4f4e\u7535\u5e73
GPIO_ResetBits(SMI_MDC_PORT, SMI_MDC_PIN);
// \u5ef6\u65f6\u4e00\u6bb5\u65f6\u95f4
delay_us(10);

return bit;

}

// \u4eceSMI\u4e2d\u63a5\u6536\u4e00\u4e2a\u6570\u636e\u5b57\u8282 uint8_t SMI_ReceiveDataByte(void) { uint8_t data = 0; uint8_t i;

// \u4ece\u9ad8\u4f4d\u5230\u4f4e\u4f4d\u63a5\u6536\u6570\u636e
for (i = 0; i < 8; i++) {
    data |= (SMI_ReceiveDataBit() << (7 - i));
}

return data;

}

// \u4f7f\u7528SMI\u534f\u8bae\u8bfb\u53d6\u5bc6\u5c0f\u5668\u7684\u503c uint16_t SMI_ReadRegister(uint8_t phyAddr, uint8_t regAddr) { uint16_t regValue = 0;

// \u53d1\u9001\u5f00\u59cb\u4f4d
SMI_SendStartBit();

// \u53d1\u9001\u5e2d\u5934
SMI_SendDataByte(0x01);

// \u53d1\u9001\u5bc6\u5c0f\u5668\u5730\u5740
SMI_SendDataByte(phyAddr);
SMI_SendDataByte(regAddr);

// \u53d1\u9001\u8bfb\u547d\u4ee4
SMI_SendDataByte(0x02);

// \u8bfb\u53d6\u5bc6\u5c0f\u5668\u503c
regValue = (SMI_ReceiveDataByte() << 8);
regValue |= SMI_ReceiveDataByte();

// \u53d1\u9001\u7ed3\u675f\u4f4d
SMI_SendStopBit();

return regValue;

}

// \u4f7f\u7528SMI\u534f\u8bae\u5199\u5165\u5bc6\u5c0f\u5668\u7684\u503c void SMI_WriteRegister(uint8_t phyAddr, uint8_t regAddr, uint16_t regValue) { // \u53d1\u9001\u5f00\u59cb\u4f4d SMI_SendStartBit();

// \u53d1\u9001\u5e2d\u5934
SMI_SendDataByte(0x01);

// \u53d1\u9001\u5bc6\u5c0f\u5668\u5730\u5740
SMI_SendDataByte(phyAddr);
SMI_SendDataByte(regAddr);

// \u53d1\u9001\u5199\u547d\u4ee4
SMI_SendDataByte(0x01);

// \u53d1\u9001\u5bc6\u5c0f\u5668\u503c
SMI_SendDataByte((regValue >> 8) & 0xFF);
SMI_SendDataByte(regValue & 0xFF);

// \u53d1\u9001\u7ed3\u675f\u4f4d
SMI_SendStopBit();

}

int main(void) { // \u521d\u59cb\u5316SMI GPIO\u5f15\u811a SMI_GPIO_Init();

// \u4f7f\u7528SMI\u534f\u8bae\u8bfb\u53d6\u5bc6\u5c0f\u5668\u7684\u503c
uint16_t regValue = SMI_ReadRegister(0x01, 0x02);

// \u4f7f\u7528SMI\u534f\u8bae\u5199\u5165\u5bc6\u5c0f\u5668\u7684\u503c
SMI_WriteRegister(0x01, 0x02, 0x1234);

while (1) {
    // \u4e3b\u5faa\u73af
}