我使用MSP430FR2033的I2C读取气压传感器HP203B的气压值，在读取前进入LPM3的话功耗为4uA，在读取后进入的话为640uA，我量了这两种情况的气压传感器各引脚状态，都是一样的，而且我用完H气压传感器后已经断电了。下面是我的I2C代码和HP203B代码。
/*
* i2c_hw.c
*
* Created on: 2017年8月7日
* Author: johnsonzhou
*/
#include "i2c_hw.h"
unsigned char *tx_data;
unsigned char *rx_data;
int tx_byte;
int TXByteCtr;
int rx_byte;
int RXByteCtr;
void i2c_Write(unsigned char addr, unsigned char *pstr, int num)
{
tx_data = pstr;
tx_byte = num;
__delay_cycles(1000); // Delay between transmissions
UCB0I2CSA = addr; // configure slave address
TXByteCtr = 0; // Load TX byte counter
while (UCB0CTLW0 & UCTXSTP); // Ensure stop condition got sent
UCB0CTLW0 |= UCTR | UCTXSTT; // I2C TX, start condition
__bis_SR_register(LPM0_bits | GIE); // Enter LPM0 w/ interrupts
}
void i2c_read(unsigned char addr, unsigned char *pstr, int num)
{
rx_data = pstr;
rx_byte = num;
__delay_cycles(1000); // Delay between transmissions
UCB0I2CSA = addr; // configure slave address
RXByteCtr = 0; // Load TX byte counter
while (UCB0CTLW0 & UCTXSTP); // Ensure stop condition got sent
UCB0CTLW0 &= ~UCTR; // I2C RX
UCB0CTLW0 |= UCTXSTT; // start condition
__bis_SR_register(LPM0_bits | GIE); // Enter LPM0 w/ interrupts
}
void i2c_init(void)
{
// Configure USCI_B0 for I2C mode
UCB0CTLW0 = UCSWRST; // put eUSCI_B in reset state
UCB0CTLW0 |= UCMODE_3 | UCMST | UCSSEL__SMCLK; // I2C master mode, SMCLK
UCB0BRW = 0x50; // baudrate = SMCLK / 80
UCB0CTLW0 &= ~UCSWRST; // clear reset register
UCB0IE |= UCTXIE0 | UCRXIE0 | UCNACKIE; // transmit and NACK interrupt enable
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_B0_VECTOR))) USCI_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{
switch(__even_in_range(UCB0IV, USCI_I2C_UCBIT9IFG))
{
case USCI_NONE: break; // Vector 0: No interrupts
case USCI_I2C_UCALIFG: break; // Vector 2: ALIFG
case USCI_I2C_UCNACKIFG: // Vector 4: NACKIFG
UCB0CTLW0 |= UCTXSTT; // resend start if NACK
break;
case USCI_I2C_UCSTTIFG: break; // Vector 6: STTIFG
case USCI_I2C_UCSTPIFG: break; // Vector 8: STPIFG
case USCI_I2C_UCRXIFG3: break; // Vector 10: RXIFG3
case USCI_I2C_UCTXIFG3: break; // Vector 12: TXIFG3
case USCI_I2C_UCRXIFG2: break; // Vector 14: RXIFG2
case USCI_I2C_UCTXIFG2: break; // Vector 16: TXIFG2
case USCI_I2C_UCRXIFG1: break; // Vector 18: RXIFG1
case USCI_I2C_UCTXIFG1: break; // Vector 20: TXIFG1
case USCI_I2C_UCRXIFG0: // Vector 22: RXIFG0
if ((RXByteCtr >= 0) && (RXByteCtr < rx_byte)) // Check TX byte counter
{
*rx_data++ = UCB0RXBUF; // Read RX buffer
RXByteCtr++; // Decrement RX byte counter
}
else
{
UCB0CTLW0 |= UCTXSTP; // I2C stop condition
UCB0IFG &= ~UCRXIFG; // Clear USCI_B0 TX int flag
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0
}
break;
case USCI_I2C_UCTXIFG0: // Vector 24: TXIFG0
if ((TXByteCtr >= 0) & (TXByteCtr < tx_byte)) // Check TX byte counter
{
UCB0TXBUF = *tx_data++; // Load TX buffer
TXByteCtr++; // Decrement TX byte counter
}
else
{
UCB0CTLW0 |= UCTXSTP; // I2C stop condition
UCB0IFG &= ~UCTXIFG; // Clear USCI_B0 TX int flag
__bic_SR_register_on_exit(LPM0_bits); // Exit LPM0
}
break;
default: break;
}
}
/*
* sht3x.c
*
* Created on: 2017年8月7日
* Author: johnsonzhou
*/
#include "hp203b.h"
#include "timer_delay.h"
struct adc_cvt_struct adc_cvt = {
ADC_CVT_H,
OSR_1024,
0,
};
struct hp203b_struct hp203b = {
0x76,
0x6,
((0x2 << 5) | (0x2 << 2) | 0x0), //OSR=1024,Temperature and Pressure Channels
0x10, //read Pressure and Temperature value
0x30, //read Pressure value
0x32, //read Temperature value
{0, 0, 0},
{0, 0, 0},
0,
0,
};
unsigned char hp203b_cmd[3];
unsigned char hp203b_data[6];
unsigned char hp203b_press_data[3];
unsigned char hp203b_temp_data[3];
void hp203b_off(void)
{
P3OUT &= ~BIT2; // off sensor power
}
void hp203b_on(void)
{
P3OUT |= BIT2; // on sensor power
}
void hp203b_rst(void)
{
hp203b_cmd[0] = hp203b.soft_rst_cmd;
i2c_Write(hp203b.Address, hp203b_cmd, 1);
}
void hp203b_adc_cvt(void)
{
hp203b.osr_ch_cmd = (adc_cvt.h << 5) | (adc_cvt.osr << 2) | (adc_cvt.chnl);
hp203b_cmd[0] = hp203b.osr_ch_cmd;
i2c_Write(hp203b.Address, hp203b_cmd, 1);
}
void hp203b_read_pt(void)
{
hp203b_cmd[0] = hp203b.read_pt_cmd;
i2c_Write(hp203b.Address, hp203b_cmd, 1);
i2c_read(hp203b.Address, hp203b_data, 6);
}
void hp203b_read_p(void)
{
hp203b_cmd[0] = hp203b.read_p_cmd;
i2c_Write(hp203b.Address, hp203b_cmd, 1);
i2c_read(hp203b.Address, hp203b_press_data, 3);
}
void hp203b_read_t(void)
{
hp203b_cmd[0] = hp203b.read_t_cmd;
i2c_Write(hp203b.Address, hp203b_cmd, 1);
i2c_read(hp203b.Address, hp203b_temp_data, 3);
}
void get_press_temp(void)
{
adc_cvt.chnl = CHNL_PT;
hp203b_on();
delay_hw_ms(10);
hp203b_rst();
delay_hw_ms(10);
hp203b_adc_cvt();
delay_hw_ms(100);
hp203b_read_pt();
hp203b.temp = ((hp203b_data[0] << 16) | (hp203b_data[1] << 8) | (hp203b_data[2] << 0)) & 0xfffff;
hp203b.temp = (hp203b.temp + 50) / 100;
hp203b.press = ((hp203b_data[3] << 16) | (hp203b_data[4] << 8) | (hp203b_data[5] << 0)) & 0xfffff;
hp203b.press = (hp203b.press + 50) / 100;
}
void get_press(void)
{
adc_cvt.chnl = CHNL_PT;
hp203b_on();
delay_hw_ms(10);
hp203b_rst();
delay_hw_ms(10);
hp203b_adc_cvt();
delay_hw_ms(100);
hp203b_read_p();
hp203b.press = ((hp203b_press_data[0] << 16) | (hp203b_press_data[1] << 8) | (hp203b_press_data[2] << 0)) & 0xfffff;
hp203b.press = (hp203b.press + 50) / 100;
}
void get_temp(void)
{
adc_cvt.chnl = CHNL_T;
hp203b_on();
delay_hw_ms(10);
hp203b_rst();
delay_hw_ms(10);
hp203b_adc_cvt();
delay_hw_ms(100);
hp203b_read_t();
hp203b.temp = ((hp203b_temp_data[0] << 16) | (hp203b_temp_data[1] << 8) | (hp203b_temp_data[2] << 0)) & 0xfffff;
hp203b.temp = (hp203b.temp + 50) / 100;
}
void hp203b_init(void)
{
get_press_temp();
//hp203b_rst();
delay_hw_ms(10);
hp203b_off();
}
