单片机 MSP430 IIC控制器编程(2)
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直接附上最近调试成功的IIC控制器程序，只贴出IIC模块，因为程序最主要的东西就是IIC通信了，其次是那些参数的设置。
这个程序暂时还比较简单，因为项目还才做到一半。
iic.h
#include "utils.h"#ifndef __IIC_H__#define __IIC_H__void iic_master_init(uint8 slave_address);int8 iic_write_register_data(uint8 slave_address, uint8 reg_address, uint8 *data, uint8 data_len);int8 iic_read_register_one_byte(uint8 slave_address, uint8 reg_address, uint8 *data);#endif /* end of iic.h */
iic.h
#include "iic.h"#include "uart.h"#define MASTER_USE_NO_INTERRUPTvoid iic_master_init(uint8 slave_address){ //Assign I2C pins to USCI_B0 P3.1 IIC_SDA P3.2 IIC_SCL P3SEL |= 0x06; //选择USCI模式 UCB0CTL1 |= UCSWRST; //置位UCSWRST, 使得USCI处于复位状态 UCB0CTL0 |= UCMST + UCMODE_3 + UCSYNC; //主控, I2C, 同步模式 UCB0CTL1 |= UCSSEL_2 + UCSWRST; // Use SMCLK UCB0BR0 = 240; // fSCL = SMCLK/240 = 100kHz UCB0BR1 = 0; UCB0I2CSA = (slave_address >> 1); // Slave Address UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation}static void iic_slave_init(uint8 self_address){ //Assign I2C pins to USCI_B0 P3.1 IIC_SDA P3.2 IIC_SCL P3SEL |= 0x06; //选择USCI模式 UCB0CTL1 |= UCSWRST; //置位UCSWRST, 使得USCI处于复位状态 UCB0CTL0 &= ~UCMST; //受控 UCB0CTL0 |= UCMODE_3 + UCSYNC; //I2C, 同步模式 UCB0I2COA = self_address; // self address UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation}static uint8 iic_is_busy(void){ uint8 busy = UCB0STAT & UCBBUSY; //0, idle; 1, busy return !!busy;}#ifdef MASTER_USE_NO_INTERRUPTstatic void iic_master_set_writemode(void){ UCB0CTL1 |= UCTR; //发送器 IFG2 &= ~UCB0TXIFG; //清除发送中断标志 IE2 &= ~UCB0RXIE; // Disable RX interrupt IE2 &= ~UCB0TXIE; // Disable TX interrupt}static void iic_master_set_readmode(void){ UCB0CTL1 &= ~UCTR; //接收器 IFG2 &= ~UCB0RXIFG; //清除接收中断标志 IE2 &= ~UCB0TXIE; // Disable TX interrupt IE2 &= ~UCB0RXIE; // Disable RX interrupt}//===========================================static int8 iic_master_send_multibyte_start_timeout(uint32 time_out){ volatile uint32 timeout = 0; //发送起始信号 UCB0CTL1 |= UCTXSTT; timeout = time_out; //起始信号产生后，TXIFG会被置位，此时从器件已经对地址作出应答(可以再判断UCTXSTT是否被清零) while(!(IFG2 & UCB0TXIFG) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; //超时 } IFG2 &= ~UCB0TXIFG; //清除发送中断标志 return __OK;}static int8 iic_master_send_multibyte_next_timeout(uint8 tx_data, uint32 time_out){ volatile uint32 timeout = 0; //先发送一个字节数据 UCB0TXBUF = tx_data; timeout = time_out; //等待该字节发送完毕 while(!(IFG2 & UCB0TXIFG) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; //超时 } IFG2 &= ~UCB0TXIFG; //清除发送中断标志 return __OK;}static int8 iic_master_send_multibyte_finish_timeout(uint8 tx_data, uint32 time_out){ iic_master_send_multibyte_next_timeout(tx_data, time_out); //发送停止信号 UCB0CTL1 |= UCTXSTP; return __OK;}static void iic_master_send_multibyte_stop(void){ //发送停止信号 UCB0CTL1 |= UCTXSTP;}//==================================================static int8 iic_master_recv_multibyte_start_timeout(uint32 time_out){ volatile uint32 timeout = 0; //Send start condition, and master device will send slave_address to slave device UCB0CTL1 |= UCTXSTT; timeout = time_out; //从器件已经对地址作出应答，UCTXSTT就被清零 while((UCB0CTL1 & UCTXSTT) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; //超时 } return __OK;}static int8 iic_master_recv_multibyte_next_timeout(uint8 *rx_data, uint32 time_out){ volatile uint32 timeout = 0; timeout = time_out; // Wait for RX buffer while((!(IFG2 & UCB0RXIFG)) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; } IFG2 &= ~UCB0RXIFG; //Capture data from receive buffer after setting stop bit due to //MSP430 I2C critical timing. *rx_data = UCB0RXBUF; return __OK;}static int8 iic_master_recv_multibyte_finish_timeout(uint8 *rx_data, uint32 time_out){ volatile uint32 timeout = 0; //发送停止信号 UCB0CTL1 |= UCTXSTP; timeout = time_out; //等待停止信号发送成功: 主机在接收完最后一个字节后，就发起停止信号，从机停止向主机发送数据 while((UCB0CTL1 & UCTXSTP) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; } timeout = time_out; // Wait for RX buffer while((!(IFG2 & UCB0RXIFG)) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { return __TIMEOUT; } IFG2 &= ~UCB0RXIFG; //Capture data from receive buffer after setting stop bit due to //MSP430 I2C critical timing. *rx_data = 0x00; *rx_data = UCB0RXBUF; return __OK;}static void iic_master_recv_multibyte_stop(void){ //发送停止信号 UCB0CTL1 |= UCTXSTP;}#endif /* end of MASTER_USE_NO_INTERRUPT *///===================================================int8 iic_write_register_data(uint8 slave_address, uint8 reg_address, uint8 *data, uint8 data_len){ uint8 i = 0; int8 ret = __OK; Printf("0000\n"); iic_master_init(slave_address); //检测IIC总线是否繁忙 while( iic_is_busy() == 1) { ; } //设置发送模式 iic_master_set_writemode(); //开始一次数据传输：先发送寄存器地址 ret = iic_master_send_multibyte_start_timeout(100); if(ret == __TIMEOUT) { iic_master_send_multibyte_stop(); Printf("1111\n"); return ret; } ret= iic_master_send_multibyte_next_timeout(reg_address, 1000); if(ret == __TIMEOUT) { iic_master_send_multibyte_stop(); Printf("2222\n"); return ret; } for(i = 0; i < data_len; i++) { ret= iic_master_send_multibyte_next_timeout(*(data + i), 1000); if(ret == __TIMEOUT) { iic_master_send_multibyte_stop(); Printf("3333\n"); return ret; } } iic_master_send_multibyte_stop(); Printf("4444\n"); return __OK;}#if 1int8 iic_read_register_one_byte(uint8 slave_address, uint8 reg_address, uint8 *data){ int8 ret = __OK; Printf("0000\n"); iic_master_init(slave_address); Printf("6666\n"); //检测IIC总线是否繁忙 while( iic_is_busy() == 1) { ; } Printf("7777\n"); //设置发送模式: 写 iic_master_set_writemode(); //发送起始信号和器件地址 ret = iic_master_send_multibyte_start_timeout(100); if(ret == __TIMEOUT) { iic_master_send_multibyte_stop(); Printf("1111\n"); return ret; } //发送寄存器地址 ret = iic_master_send_multibyte_next_timeout(reg_address, 1000); if(ret == __TIMEOUT) { iic_master_send_multibyte_stop(); Printf("2222\n"); return ret; } //设置接收模式 iic_master_set_readmode(); //发送起始信号和器件地址 ret = iic_master_recv_multibyte_start_timeout(600000); if(ret == __TIMEOUT) { iic_master_recv_multibyte_stop(); Printf("3333\n"); return ret; } //接收从机发来的一个字节 ret = iic_master_recv_multibyte_finish_timeout(data, 10000); if(ret == __TIMEOUT) { iic_master_recv_multibyte_stop(); Printf("5555\n"); return ret; } Printf("4444\n"); return __OK;}#elseint8 iic_read_register_one_byte(uint8 slave_address, uint8 reg_address, uint8 *data){ int8 ret = __OK; Printf("0000\n"); iic_master_init(slave_address); Printf("6666\n"); //检测IIC总线是否繁忙 while( iic_is_busy() == 1) { ; } Printf("1212120\n"); //设置发送模式: 写 iic_master_set_writemode(); //开始一次数据传输：先发送寄存器地址 volatile uint32 timeout = 0; //Send start condition. UCB0CTL1 |= UCTXSTT; timeout = 100; //Poll for transmit interrupt flag. while(!(IFG2 & UCB0TXIFG) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { Printf("7777 timeout\n"); return __TIMEOUT; //超时 } IFG2 &= ~UCB0TXIFG; //清除发送中断标志 //Send single byte data. UCB0TXBUF = reg_address; Printf("34444\n"); timeout = 100; //Poll for transmit interrupt flag. while(!(IFG2 & UCB0TXIFG) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { Printf("78956 timeout\n"); return __TIMEOUT; //超时 } IFG2 &= ~UCB0TXIFG; //清除发送中断标志 //设置接收模式 iic_master_set_readmode(); //发送起始信号: 读 UCB0CTL1 |= UCTXSTT; timeout = 5000; //Poll for transmit interrupt flag. while((UCB0CTL1 & UCTXSTT) && (--timeout)) { //PutChar('x'); } if(timeout == 0) { Printf("3131 timeout\n"); return __TIMEOUT; //超时 } //Send stop condition. UCB0CTL1 |= UCTXSTP; timeout = 5000; //Wait for Stop to finish while((UCB0CTL1 & UCTXSTP) && (--timeout)) { //PutChar('x'); } //Check if transfer timed out if(timeout == 0) { Printf("9990 timeout\n"); return __TIMEOUT; } Printf("2244\n"); timeout = 5000; // Wait for RX buffer while((!(IFG2 & UCB0RXIFG)) && (--timeout)) { //PutChar('x'); } //Check if transfer timed out if(timeout == 0) { Printf("1234 timeout\n"); return __TIMEOUT; } IFG2 &= ~UCB0RXIFG; //Capture data from receive buffer after setting stop bit due to //MSP430 I2C critical timing. *data = UCB0RXBUF; Printf("4444\n"); return __OK;}#endif//======================================================#ifdef USE_INTERRUPTvoid iic_set_writeMode(void){ UCB0CTL1 |= UCTR; //发送器 IFG2 &= UCB0TXIFG; //清楚发送中断标志 IE2 &= ~UCB0RXIE; // Disable RX interrupt IE2 |= UCB0TXIE; // Enable TX interrupt}void iic_ReadMode(void){ UCB0CTL1 &= ~UCTR; //接收器 IFG2 &= UCB0RXIFG; //清楚接收中断标志 IE2 &= ~UCB0TXIE; // disable TX interrupt IE2 |= UCB0RXIE; // enable RX interrupt}#endif 0 0
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