CC1101: CC1101读取寄存器问题，只返回状态码，不返回数据

我搜到类似的问题，但没人解决。里面有一个链接引用，也不能访问了。只能再问一次

我想用CC2530读取CC1101的0x31寄存器（VERSION），但是逻辑分析仪的结果如下图，只返回状态码0x0F，但是不返回数据（预期0x14）

下面是CC2530的最小源文件

#include <pinDefine.h>
#include <shortTypes.h>
#include <CC1101PinDefine.h>
#include <ioCC2530.h>
#include <helpTools.h>

#define MISO P1_7 //orange
#define MOSI P1_6 //red
#define SCK  P1_5 //yellow
#define CSn  P1_4 //brown

#define WR_OP_S(addr)( (addr & 0x3f) | 0x00 )//  [7, 6] = 00
#define RD_OP_S(addr)( (addr & 0x3f) | 0x80 )//  [7, 6] = 10


void SPI_init(void){//!UART1 use alt 2 positionPERCFG  |=  0x02;P1SEL|=  0xE0;//MISO, MOSI, SCK set to peripheral functionP1SEL&=  ~0x10;  //CSn, general I/OP1DIR|=  0x70;//CSn, SCK, MOSI, set to outputP1DIR&=  ~0x80;//MISO set to input//!SPI SCK freq, clk is 32MHz, here is 1.5MHzU1GCR|=  15;U1BAUD  |=  128;//!SPI mode cfgU1GCR&=  ~0xC0;  //!assure that CPOL/CPHA = 0U1CSR&=  ~0xA0;  //!assuure that mode = 0, namely SPI modeU1GCR|=  0x20;//!MSB
}

//by SPI, send data to CC1101
uchar SPI_send(uchar data){U1DBUF = data;//write to send bufferwhile(!(U1CSR & 0x01));//wait for send(TX)U1CSR &= ~0x01;//clear flagreturn U1DBUF;//read receive, because SPI is full-duplex
}

uchar CC1101_ReadReg(uchar addr){uchar value = 0x44;CSn = 0;Delay(1);SPI_send(RD_OP_S(addr));value = SPI_send(0x00);Delay(1);CSn = 1;return value;
}

void CC1101_WriteReg(uchar addr, uchar data){CSn = 0;Delay(1);//lower CSnSPI_send(WR_OP_S(addr));//write addr, here bit7 = 0 means writeSPI_send(data);//write dataDelay(1);CSn = 1;//upper CSn
}

void CC1101_SendCommand(uchar cmd){CSn = 0;Delay(1);SPI_send(cmd);Delay(1);CSn = 1;
}

void CC1101_Init(void){//hardware resetCSn = 1;Delay(10);CSn = 0;Delay(100);CSn = 1;Delay(100);//software resetCC1101_SendCommand(CC1101_SRES);Delay(200);
}

void CLK_init(void){CLKCONCMD&=~0x40;while(CLKCONSTA & 0x40);CLKCONCMD&=~0x47;
}

void LED_Init(){P1SEL &= ~0x03;P1DIR |=  0x03;LED1 = 1;LED2 = 1;
}

void LED1_blink(){LED1 = 1;Delay(100); LED1 = 0;
}

void light_LED2(){LED2 = 0;
}

int main(){LED_Init();SPI_init();CC1101_Init();light_LED2();//init finish indicatorwhile(1){Delay(1000);LED1_blink();//working indicatorCC1101_ReadReg(CC1101_VERSION);}
}

Alice：

您好， 已经收到了您的案例，调查需要些时间，感谢您的耐心等待。

,

F T：

问题已经解决了，关键是CC1101 DataSheet Section 10.2/Page 32，有一句很重要的话：

"For register addresses in the range 0x30-0x3D, the burst bit is used to select between status registers when burst bit is one, and between command strobes when burst bit is zero."

这句话太容易忽略了，应该加粗的。

就具体解决，只需把CC1101_ReadReg中的SPI_send(RD_OP_S(addr));，改为SPI_send(RD_OP_B(addr));

#define RD_OP_B(addr) ( (addr & 0x3f) | 0xc0 ) // [7, 6] = 11

这份代码也挺短小精悍的，就留给新手入门吧