227 lines
3.8 KiB
C
227 lines
3.8 KiB
C
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "i2c.h"
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#include "nvic.h"
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static void I2C_delay()
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{
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volatile int i = 7;
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while (i)
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i--;
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}
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static int I2C_Start()
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{
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SDA_H;
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SCL_H;
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I2C_delay();
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if (!SDA_read)
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return 0;
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SDA_L;
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I2C_delay();
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if (SDA_read)
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return 0;
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SDA_L;
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I2C_delay();
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return 1;
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}
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static void I2C_Stop()
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{
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SDA_H;
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I2C_delay();
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}
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static void I2C_Ack()
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{
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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static void I2C_NoAck()
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{
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SCL_L;
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I2C_delay();
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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static int I2C_WaitAck()
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{
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SCL_L;
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I2C_delay();
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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if (SDA_read) {
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SCL_L;
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return 0;
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}
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SCL_L;
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return 1;
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}
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static void I2C_SendByte(uint8_t b)
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{
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uint8_t i = 8;
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while (i--) {
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SCL_L;
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I2C_delay();
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if (b & 0x80)
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SDA_H;
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else
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SDA_L;
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b <<= 1;
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I2C_delay();
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SCL_H;
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I2C_delay();
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}
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SCL_L;
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}
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static uint8_t I2C_ReadByte()
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{
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uint8_t i = 8;
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uint8_t byte = 0;
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SDA_H;
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while (i--) {
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byte <<= 1;
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SCL_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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if (SDA_read) {
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byte |= 0x01;
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}
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}
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SCL_L;
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return byte;
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}
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void PB_I2C_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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//已更改
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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}
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int PB_I2C_Write_Byte(uint8_t addr, uint8_t reg, uint8_t data)
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{
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if (!I2C_Start())
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return 0;
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I2C_SendByte(addr << 1 | I2C_Direction_Transmitter);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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I2C_SendByte(reg);
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I2C_WaitAck();
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I2C_SendByte(data);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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I2C_Stop();
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return 1;
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}
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int PB_I2C_Write_Buf(uint8_t addr, uint8_t reg, uint8_t *data , uint8_t size)
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{
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int i;
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if (!I2C_Start())
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return 0;
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I2C_SendByte(addr << 1 | I2C_Direction_Transmitter);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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I2C_SendByte(reg);
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I2C_WaitAck();
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for (i = 0; i < size; i++) {
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I2C_SendByte(data[i]);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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}
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I2C_Stop();
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return 1;
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}
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int PB_I2C_Read_Byte(uint8_t addr, uint8_t reg, uint8_t* data)
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{
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if (!I2C_Start())
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return 0;
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I2C_SendByte(addr << 1 | I2C_Direction_Transmitter);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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I2C_SendByte(reg);
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I2C_WaitAck();
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I2C_Start();
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I2C_SendByte(addr << 1 | I2C_Direction_Receiver);
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I2C_WaitAck();
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*data = I2C_ReadByte();
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I2C_NoAck();
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I2C_Stop();
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return 1;
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}
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int PB_I2C_Read_Buf(uint8_t addr,uint8_t reg, uint8_t* data , uint8_t size)
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{
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if (!I2C_Start())
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return 0;
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I2C_SendByte(addr << 1 | I2C_Direction_Transmitter);
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if (!I2C_WaitAck()) {
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I2C_Stop();
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return 0;
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}
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I2C_SendByte(reg);
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I2C_WaitAck();
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I2C_Start();
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I2C_SendByte(addr << 1 | I2C_Direction_Receiver);
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I2C_WaitAck();
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while (size) {
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*data = I2C_ReadByte();
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if (size == 1)
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I2C_NoAck();
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else
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I2C_Ack();
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data++;
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size--;
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}
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I2C_Stop();
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return 1;
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}
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#ifdef __cplusplus
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}
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#endif
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