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*
* MSP430 CODE EXAMPLE DISCLAIMER
*
* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
* concise manner. For this the code may rely on the device's power-on default
* register values and settings such as the clock configuration and care must
* be taken when combining code from several examples to avoid potential side
* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
* for an API functional library-approach to peripheral configuration.
*
* --/COPYRIGHT--*/
//******************************************************************************
// MSP430FR235x Demo - eUSCI_B0 I2C Master RX multiple bytes from MSP430 Slave
//
// Description: This demo connects two MSP430's via the I2C bus. The master
// reads 5 bytes from the slave. This is the MASTER CODE. The data from the slave
// transmitter begins at 0 and increments with each transfer.
// The USCI_B0 RX interrupt is used to know when new data has been received.
// ACLK = default REFO ~32768Hz, MCLK = SMCLK = BRCLK = DCODIV ~1MHz.
//
// *****used with "msp430fr235x_euscib0_i2c_11.c"****
//
// /|\ /|\
// MSP430FR2355 10k 10k MSP430FR2355
// slave | | master
// ----------------- | | -----------------
// | P1.2/UCB0SDA|<-|----|->|P1.2/UCB0SDA |
// | | | | |
// | | | | |
// | P1.3/UCB0SCL|<-|------>|P1.3/UCB0SCL |
// | | | P1.0|--> LED
//
// Cash Hao
// Texas Instruments Inc.
// November 2016
// Built with IAR Embedded Workbench v6.50.0 & Code Composer Studio v6.2.0
//******************************************************************************
#include <msp430.h>
volatile unsigned char RXData[128];
int i =0,r=0;
void init_receive(void)
{
// Configure USCI_B0 for I2C mode
UCB0CTLW0 |= UCSWRST; // Software reset enabled
UCB0CTLW0 |= UCMODE_3 | UCMST | UCSYNC; // I2C mode, Master mode, sync
UCB0CTLW1 |= UCASTP_2; // Automatic stop generated
// after UCB0TBCNT is reached
UCB0BRW = 0x0008; // baudrate = SMCLK / 8
UCB0TBCNT = 0x0005; // number of bytes to be received
UCB0I2CSA = 0x0048; // Slave address
UCB0CTLW0 &=~UCTR; //接收模式
UCB0CTL1 &= ~UCSWRST;
UCB0IE &=~UCTXIE; //停止发送中断
UCB0IE |= UCRXIE | UCNACKIE | UCBCNTIE;
}
void init_trans(void)
{
// Configure USCI_B0 for I2C mode
UCB0CTLW0 |= UCSWRST; // put eUSCI_B in reset state
UCB0CTLW0 |= UCMODE_3 | UCMST | UCSYNC; // I2C master mode, SMCLK
UCB0BRW = 0x8; // baudrate = SMCLK / 8
UCB0CTLW0 |=UCTR; //发送模式
UCB0I2CSA = 0x48; // configure slave address
UCB0CTLW0 &=~ UCSWRST; // clear reset register
UCB0IE &=~UCRXIE; //停止接收中断
UCB0IE |= UCTXIE | UCNACKIE | UCBCNTIE; // transmit and NACK interrupt enable
}
int main(void)
{
WDTCTL = WDTPW | WDTHOLD;
// Configure GPIO
P1SEL0 |= BIT2 | BIT3; // I2C pins
// Disable the GPIO power-on default high-impedance mode to activate
// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;
_EINT();
_NOP();
while (1)
{
//配置成接收模式中断接收字节
init_receive();
while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent
UCB0CTL1 |= UCTXSTT; // I2C start condition
__delay_cycles(2000);
//配置成发送模式发送字节 中断发送字节
init_trans();
while (UCB0CTLW0 & UCTXSTP); // Ensure stop condition got sent
UCB0CTLW0 |= UCTR | UCTXSTT; // I2C TX, start condition
__delay_cycles(10000);
}
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = USCI_B0_VECTOR
__interrupt void USCIB0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_B0_VECTOR))) USCIB0_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
UCB0CTL1 |= UCTXSTT; // I2C start condition
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 14: TXIFG3
case USCI_I2C_UCRXIFG2: break; // Vector 16: RXIFG2
case USCI_I2C_UCTXIFG2: break; // Vector 18: TXIFG2
case USCI_I2C_UCRXIFG1: break; // Vector 20: RXIFG1
case USCI_I2C_UCTXIFG1: break; // Vector 22: TXIFG1
case USCI_I2C_UCRXIFG0: // Vector 24: RXIFG0
RXData[i] = UCB0RXBUF; // Get RX data
i++;
if(i>52)
{
i=0;
}
break;
case USCI_I2C_UCTXIFG0:
UCB0TXBUF = 0x55; // Load TX buffer
UCB0CTLW0 |= UCTXSTP; // I2C stop condition
UCB0IFG &= ~UCTXIFG; // Clear USCI_B0 TX int flag
r++;
if(r>20)
{
r=0;
}
break; // Vector 26: TXIFG0
case USCI_I2C_UCBCNTIFG: // Vector 28: BCNTIFG
break;
case USCI_I2C_UCCLTOIFG: break; // Vector 30: clock low timeout
case USCI_I2C_UCBIT9IFG: break; // Vector 32: 9th bit
default: break;
}
}
//以上是我参考TI官方提供的例程，两个合在一块，接收正常，但是发送失败？不知道自己配置哪里出现问题，单独两个例程（master 读例程 master写例程）与从机测试都OK
