TI中文支持网// MSP430F550x
// —————–
// /|\| |
// | | |
// –|RST P4.7|-> LED
// | |
// | P3.2|-> Serial Clock Out (UCB0SCK)
// | P3.1|<- Data In (UCB0SOMI)
// | P3.0|-> Data Out (UCB0SIMO)
// | P3.0|-> Data Out (UCB0STE)
参考的例程为 slac129a.zip （MSP430FG4618/F2013 Experimenter’s Board Software），使用到的2个功能为：
char TI_CC_SPIReadReg(char addr)
{
char x;
TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN; // /CS enable
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for TX to finish
UCB0TXBUF = (addr | TI_CCxxx0_READ_SINGLE);// Send address
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for TX to finish
UCB0TXBUF = 0; // Dummy write so we can read data
// Address is now being TX'ed, with dummy byte waiting in TXBUF…
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for RX to finish
// Dummy byte RX'ed during addr TX now in RXBUF
UCB0IFG &= ~UCRXIFG; // Clear flag set during addr write
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for end of dummy byte TX
// Data byte RX'ed during dummy byte write is now in RXBUF
x = UCB0RXBUF; // Read data
TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN; // /CS disable
return x;
}
void TI_CC_SPIReadBurstReg(char addr, char *buffer, char count)
{
char i;
TI_CC_CSn_PxOUT &= ~TI_CC_CSn_PIN; // /CS enable
while (TI_CC_SPI_USCIB0_PxIN&TI_CC_SPI_USCIB0_SOMI);// Wait for CCxxxx ready
UCB0IFG &= ~UCRXIFG; // Clear flag
UCB0TXBUF = (addr | TI_CCxxx0_READ_BURST); // Send address
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for TXBUF ready
UCB0TXBUF = 0; // Dummy write to read 1st data byte
// Addr byte is now being TX'ed, with dummy byte to follow immediately after
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for end of addr byte TX
UCB0IFG &= ~UCRXIFG; // Clear flag
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for end of 1st data byte TX
// First data byte now in RXBUF
for (i = 0; i < (count-1); i++)
{
UCB0TXBUF = 0; //Initiate next data RX, meanwhile..
buffer[i] = UCB0RXBUF; // Store data from last data RX
while (!(UCB0IFG &= ~UCRXIFG)); // Wait for RX to finish
}
buffer[count-1] = UCB0RXBUF; // Store last RX byte in buffer
TI_CC_CSn_PxOUT |= TI_CC_CSn_PIN; // /CS disable
}
现在的问题是，时钟系统采用ACLK=32.768、SMCK=24.576MHz，当启动F5510的硬件SPI并配置端口后，CC1101模块上电，设置相关参数。为验证SPI，采用了以下2种方式对CC1101的寄存器进行读写：
方法1、连续方式的单个读寄存器，即循环使用 TI_CC_SPIReadReg() 读一批寄存器的值，结果为正确。
for (i=0; i<32; i++) RxBuf[i] = TI_CC_SPIReadReg(i);
方法2、使用例程的 TI_CC_SPIReadBurstReg(0, RxBuf, 32) 读同一批寄存器的值，结果出现第一个结果丢失的现象、其余全部正确。即期望的第1个数据不见了，第2个数据被保存在了RxBuf[0]，第3个数据被保存在了RxBuf[1]，第4个数据被保存在了RxBuf[2]，…，第32个数据被保存在了RxBuf[30]（正确位置应该是保存在RxBuf[31]）。
补充：方法2如果用于MSP430F2132+CC1101、DCO_1MHz则不会发生这种数据丢失的现象。
请求帮助分析原因并解决这个BUG，谢谢。
Young Hu：
您好，
给您提供一个文档，看看是不是有用
www.ti.com/…/swra141.pdf
