因为对SPI的控制这方面的资料比较少，所以不知道这么做对不对。发射模块返回的状态寄存器STATUS值一直为0x07，按照附件的调试方法，返回的应该是0x2e。我想问一下关于SPI的使用有没有问题，代码如下。
#include <stdint.h>
#include <stdbool.h>
#include "inc/tm4c123gh6pm.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_ssi.h"
#include "driverlib/ssi.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/gpio.h"
#include "nrf24l01.h"
#define SSI_BitRate 1000000
// Define a static TX address
uint8_t TX_ADDRESS[TX_ADR_WIDTH] = {0x34,0x43,0x10,0x10,0x01};
uint8_t RX_ADDRESS[RX_ADR_WIDTH] = {0x34,0x43,0x10,0x10,0x01};
uint8_t Tx_Buf[TX_PLOAD_WIDTH]={0xfe,0xfd,0xfb,0xf7};
uint8_t statusx;
//*********************************************************************
//SPI initialization,配置TM4C123GH6PM的SPI硬件
void SPI_TM4C123_init(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
GPIOPinConfigure(GPIO_PA2_SSI0CLK);
GPIOPinConfigure(GPIO_PA3_SSI0FSS);
GPIOPinConfigure(GPIO_PA4_SSI0RX);
GPIOPinConfigure(GPIO_PA5_SSI0TX);
GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2);
SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0,SSI_MODE_MASTER,SSI_BitRate,SSI_CR0_DSS_8);
SSIEnable(SSI0_BASE);
ROM_SysCtlDelay(10000);
}
//********************************************************************
//用SPI配置nrf24l01的寄存器函数
uint8_t SPI_Write_register(uint8_t WriteReg,uint8_t Value)//WriteReg要写的寄存器地址，Value要写的寄存器值
{
uint32_t ui32Data;
uint8_t ui8Data;
SSIDataPut(SSI0_BASE, WriteReg);
SSIDataGet(SSI0_BASE, &ui32Data);
SSIDataPut(SSI0_BASE, Value);
SSIDataGet(SSI0_BASE, &ui32Data);
while (SSIBusy(SSI0_BASE)){}
ui8Data = ui32Data & 0xff;
return(ui8Data);
}
//**********************************************************************
uint8_t SPI_Write_Buf(uint8_t WriteReg, uint8_t *pBuf, uint8_t bytes)
{
uint8_t i,ui8Data;
uint32_t ui32Data;
SSIDataPut(SSI0_BASE,WriteReg); // Select register to write to and read status byte
SSIDataGet(SSI0_BASE, &ui32Data);
for(i=0; i<bytes; i++) // then write all byte in buffer(*pBuf)
{SSIDataPut(SSI0_BASE,*pBuf++);SSIDataGet(SSI0_BASE, &ui32Data);}
ui8Data = ui32Data & 0xff;
return(ui8Data);
}
//***********************************************************************
void nrf24l01init(void)
{
GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_6,0); // 处于待机模式一，所以可以写寄存器
SPI_Write_Buf(WRITE_REG + TX_ADDR, TX_ADDRESS, TX_ADR_WIDTH); // Writes TX_Address to nRF24L01
//SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH);
SPI_Write_register(WRITE_REG+EN_AA,0X00);//失能通道0自动应答,方便单独调试
SPI_Write_register(WRITE_REG+EN_RXADDR,0X00);//失能接受通道0，方便单独调试发送模块
SPI_Write_register(WRITE_REG+SETUP_RETR,0x00);//失能自动重发
SPI_Write_register(WRITE_REG + RF_CH, 0x02); // Select RF channel 40
SPI_Write_register(WRITE_REG +RX_PW_P0,RX_PLOAD_WIDTH);
SPI_Write_register(WRITE_REG + RF_SETUP, 0x07); // TX_PWR:0dBm, Datarate:1Mbps, LNA:HCURR
SPI_Write_register(WRITE_REG + CONFIG, 0x0e); //
}
//*************************************************************************
void nrf24l01TxMode(void)//参考功能使用文档设置
{
uint32_t ui32Loop;
GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_6,0); // 待机模式一chip enable
SPI_Write_Buf(WRITE_REG + RX_ADDR_P0, RX_ADDRESS, RX_ADR_WIDTH);
SPI_Write_Buf(WR_TX_PLOAD, Tx_Buf, TX_PLOAD_WIDTH); // Writes data to TX payload
GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_6,GPIO_PIN_6);
for(ui32Loop = 0; ui32Loop < 2000000; ui32Loop++){}//延时
GPIOPinWrite(GPIO_PORTA_BASE,GPIO_PIN_6,0);//CE从高到低
}
//*************************************************************************
uint8_t SPIReadStatus(uint8_t reg)
{
uint32_t ui32Data;
uint8_t ui8Data;
SSIDataPut(SSI0_BASE, reg);
SSIDataPut(SSI0_BASE, 0);
SSIDataGet(SSI0_BASE, &ui32Data);
ui8Data = ui32Data & 0xff;
return(ui8Data);
}
//***************************************************************************
//检测是否发射成功，成功红色的灯闪一下
void testTXWin(void)
{
uint32_t ui32Loop;
int8_t status,FIFOStatus;
status=SPIReadStatus(STATUS);
FIFOStatus=SPIReadStatus(FIFO_STATUS);
if(status==0x2e&&FIFOStatus==0x11)//红色灯亮
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE,GPIO_PIN_1);
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_PIN_1);
for(ui32Loop = 0; ui32Loop < 2000000; ui32Loop++){}
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,0);
for(ui32Loop = 0; ui32Loop < 2000000; ui32Loop++){}
}
}
//***************************************************************************
int main(void)
{
uint8_t statusx;
SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_MAIN);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE,GPIO_PIN_6);
GPIOPinTypeGPIOInput(GPIO_PORTA_BASE,GPIO_PIN_7);
SPI_TM4C123_init();
nrf24l01init();
nrf24l01TxMode();
//进入一直发射状态
while(1)
{
nrf24l01TxMode();
statusx=SPIReadStatus(STATUS);
testTXWin();
while(SSIBusy(SSI0_BASE)){}
}
}
调试的方法见文档附件。
我在TI的英文支持版块找到这个参考，一定要像它这样写吗
http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/349051
另外一个参考是来自TIVAWARE的SPI_flash.c
