si4438 cca 侦听 | 易学教程

/* set GPIO0 for RSSI interrupt / CCA */
txbuf[0] = CMD_GPIO_PIN_CFG;
txbuf[1] = 27; /* GPIO[0] = 27: CCA or 37: CCA_LATCH */
txbuf[2] = 0; /* GPIO[1] = DONOTHING */
txbuf[3] = 0; /* GPIO[2] = DONOTHING */
txbuf[4] = 0; /* GPIO[3] = DONOTHING */
txbuf[5] = 0; /* NIRQ = behavior not modified */
txbuf[6] = 0; /* SDO = behavior not modified*/
txbuf[7] = 0; /* GEN_CONFIG = GPIO outputs will have the highest drive strength*/
si446x_SendCommand(8, txbuf);
si446x_WaitForCTS();

/* set RSSI threshold */
txbuf[0] = CMD_SET_PROPERTY;
txbuf[1] = PROP_MODEM_GROUP;
txbuf[2] = 0x03; /* num of property */
txbuf[3] = PROP_MODEM_RSSI_THRESH;/* start address */
txbuf[4] = 30; /* MODEM_RSSI_THRESH: if < 30, CCA GPIO0 becomes low */
txbuf[5] = 0x0c; /* MODEM_RSSI_JUMP_THRESH: default */
txbuf[6] = 0x22; /* MODEM_RSSI_CONTROL: check thresh after latch, latch RSSI when sync word is detected */
si446x_SendCommand(5, txbuf);
si446x_WaitForCTS();

#include <reg51.h>
#include <string.h>
#include "radio.h"
#include"spi.h"
#include"uart.h"
#define U8 unsigned char
#define SEND_OUT_MESSAGE_WITH_ACK "NEED_ACK"
#define SEND_OUT_MESSAGE_NO_ACK "NO_ACK"
#define SEND_OUT_ACK "ACK!"
#define SEND_OUT_MESSAGE_WITH_ACK_LEN 8
#define SEND_OUT_MESSAGE_NO_ACK_LEN 6
#define SEND_OUT_ACK_LEN 4
#define SNED_OUT_MSG_MAX_LEN 8 //It is the maxium length of the send out packet.
extern idata U8 ItStatus1,ItStatus2;
void delay_ms(unsigned int ms)
{
unsigned int i;
unsigned char j;
for(i=0;i<ms;i++)
{
for(j=0;j<200;j++);
for(j=0;j<102;j++);
}
}
void Init_Device(void)
{
// Reset_Sources_Init();
// PCA_Init();
// Port_IO_Init(); // Oscillator_Init();
// Timer0_Init();
SPI_Init();
EA = 1; //Enable Gloable interruption.
//启动射频模块，模块的SDN引脚拉低后必须延时至少30ms，实际上可以直接把SDN引脚接地，这样就不用在程序中初始化了；
RF_SDN=0;
delay_ms(30);
delay_ms(30);
// RF_SDN = 0;
// DelayMs(30);
// NSEL = 1;
// SCLK = 0;
SpiWriteRegister(0x0B, 0xCA);
SpiWriteRegister(0x0C, 0xCA);
SpiWriteRegister(0x0D, 0xCA);
//1.Blink the LED to show that the initialization is finished.
//2.Wait for more than 16ms to wait for the radio chip to work correctly.
// TurnOnAllLEDs();
// DelayMs(20);
delay_ms(20);
// TurnOffAllLEDs();
}
void main(void)
{
U8 length,temp8, *str, sendLen;
U8 payload[10];
//Initialize the MCU:
UART_Init();
Init_Device();
UART_Send_Str("MCU初始化完毕....\n");
//读取中断状态寄存器清除中断标志以便释放NIRQ引脚
//如果中断来了，那么NIRQ引脚会被拉低；如果这时候中断状态寄存器0x03和0x04被读取，那么NIRQ引脚会被释放恢复高电平
ItStatus1 = SpiReadRegister(0x03); //read the Interrupt Status1 register
ItStatus2 = SpiReadRegister(0x04); //read the Interrupt Status2 register
//SW reset，软件复位这个模块主控芯片
SpiWriteRegister(0x07, 0x80); //write 0x80 to the Operating & Function Control1 register
// DelayMs(20);
delay_ms(20);
delay_ms(20);
//wait for POR interrupt from the radio (while the nIRQ pin is high)
//wait for chip ready interrupt from the radio (while the nIRQ pin is high)
//等待软复位完成，当软复位完成后有中断发生。客户也可以在这里直接延时至少20ms而不用等待中断来；等待至少20ms后复位完成，这时候必须读中断状态寄存器释放中断引脚
while ( NIRQ == 1);
//read interrupt status registers to clear the interrupt flags and release NIRQ pin
ItStatus1 = SpiReadRegister(0x03); //read the Interrupt Status1 register
ItStatus2 = SpiReadRegister(0x04); //read the Interrupt Status2 register
//根据不同的射频参数初始化射频模块；
RF_init();
UART_Send_Str("RF芯片si4432初始化完毕....\n");
//Enable two interrupts:
// a) one which shows that a valid packet received: 'ipkval'
// b) second shows if the packet received with incorrect CRC: 'icrcerror'
//设置中断使能寄存器，这里设置为只有当有效的数据包被接收或者接收到的数据包数据CRC校验出错才来中断；具体设置参考0x05和0x06寄存器
SpiWriteRegister(0x05, 0x03); //write 0x03 to the Interrupt Enable 1 register
SpiWriteRegister(0x06, 0x00); //write 0x00 to the Interrupt Enable 2 register
//output dummy data.
PB1_TX = 1;
PB2_TX = 1;
str = SEND_OUT_MESSAGE_WITH_ACK;
sendLen = SEND_OUT_MESSAGE_WITH_ACK_LEN;
//设置模块处于接收状态，当没有按键按下的时候一直处于接收状态，等待接收数据
RFSetRxMode();
UART_Send_Str("模块处于接收状态....\n");
/*MAIN Loop*/
while(1)
{
//当按键被按下就有一个数据包被发出；
if(PB1_TX == 0)
{
while( PB1_TX == 0 );
UART_Send_Str("按键按下,开始发送....\n");
RFFIFOSendData(sendLen, str);
//after packet transmission set the interrupt enable bits according receiving mode
//Enable two interrupts:
// a) one which shows that a valid packet received: 'ipkval'
// b) second shows if the packet received with incorrect CRC: 'icrcerror'
//设置中断使能寄存器，这里设置为只有当有效的数据包被接收或者接收到的数据包数据CRC校验出错才来中断；具体设置参考0x05和0x06寄存器
SpiWriteRegister(0x05, 0x03); //write 0x03 to the Interrupt Enable 1 register
SpiWriteRegister(0x06, 0x00); //write 0x00 to the Interrupt Enable 2 register
//发射完毕后设置模块让它又工作在接收状态下；
RFSetRxMode();
UART_Send_Str("发送完毕，恢复到接收状态....\n");
}
//check whether interrupt occured
//查询中断是否到来，如果中断来了，根据我们前面中断使能寄存器的设置，说明有效数据包已经收到，或者收到的数据包CRC校验出错；
//如果客户采用中断触发的方式，那么服务程序必须包括这些内容。在中断服务程序中必须判断被使能的那些中断的状态位是否被置位，然后根据不同的
//状态位进行处理
if( NIRQ == 0 )
{
//设置模块处于空闲模式，处理收到的数据包，不继续接收数据
RFSetIdleMode();
UART_Send_Str("中断来了....\n");
/*CRC Error interrupt occured*/
//判断是否由于CRC校验出错引发的中断；在RFSetIdleMode中已经读出了中断状态寄存器的值
if( (ItStatus1 & 0x01) == 0x01 )
{
//reset the RX FIFO
//如果是CRC校验出错，那么接收FIFO复位；
SpiWriteRegister(0x08, 0x02); //write 0x02 to the Operating Function Control 2 register
SpiWriteRegister(0x08, 0x00); //write 0x00 to the Operating Function Control 2 register
//blink all LEDs to show the error
//闪灯提示，客户移植代码的时候这个闪灯操作根据不同客户不同操作
// TurnOnAllLEDs();
// DelayMs(2);
UART_Send_Str("CRC校验出错中断....\n");
// TurnOffAllLEDs();
}
/*packet received interrupt occured*/
//判断是否是数据包已经被正确接收。
if( (ItStatus1 & 0x02) == 0x02 )
{
//Read the length of the received payload
//数据包已经被正确接收，读取收到的数据包长度
length = SpiReadRegister(0x4B); //read the Received Packet Length register
//根据长度判断相应的操作。客户可以不做这些，而直接从FIFO读出收到的数据；
//check whether the received payload is not longer than the allocated buffer in the MCU
if(length <= SNED_OUT_MSG_MAX_LEN)
{
//Get the reeived payload from the RX FIFO
//直接从FIFO中读取收到的数据。客户只要读出FIFO的数据就算收到数据。
for(temp8=0;temp8 < length;temp8++)
{
payload[temp8] = SpiReadRegister(0x7F); //read the FIFO Access register
}
for(temp8=0;temp8 < length;temp8++)
{
UART_Send_Byte(payload[temp8]); //向串口发送接收到的数据
}
UART_Send_Str("向串口发送接收到的数据....\n");
//check whether the acknowledgement packet received
//判断是否是预先设定的数据；一般应用情况客户可以不理会这个，这个判断只是我们demo板的应用。客户只要读出FIFO的数据就算收到数据；
if(( length == SEND_OUT_ACK_LEN ) || (length == SEND_OUT_MESSAGE_NO_ACK_LEN))
{
if((memcmp(&payload[0], SEND_OUT_ACK, SEND_OUT_ACK_LEN - 1) == 0 )
|| (memcmp(&payload[0], SEND_OUT_MESSAGE_NO_ACK, SEND_OUT_MESSAGE_NO_ACK_LEN - 1) == 0))
{
//blink LED2 to show that ACK received
// RxLEDOn();
//Show the Rx LED for about 10ms
UART_Send_Str("数据包已经被正确接收....\n");
// DelayMs(2);
// TurnOffAllLEDs();
}
}
//check whether an expected packet received, this should be acknowledged
//判断是否是需要发送回答信号的数据包。这个只是根据收到的数据做的不同操作，在客户那里可能是根据收到的数据做的特定的操作，例如控制某个开关
if( length == SEND_OUT_MESSAGE_WITH_ACK_LEN )
{
//必须发送应答信号，启动发送
if( memcmp(&payload[0], SEND_OUT_MESSAGE_WITH_ACK, SEND_OUT_MESSAGE_WITH_ACK_LEN - 1) == 0 )
{
//blink LED2 to show that the packet received
//RxLEDOn();
//Show the Rx LED for about 10ms
// DelayMs(2);
UART_Send_Str("发送应答....\n");
// TurnOffAllLEDs();
//发送应答信号。
/*send back an acknowledgement*/
RFFIFOSendData(SEND_OUT_ACK_LEN, SEND_OUT_ACK);
//after packet transmission set the interrupt enable bits according receiving mode
//Enable two interrupts:
// a) one which shows that a valid packet received: 'ipkval'
// b) second shows if the packet received with incorrect CRC: 'icrcerror'
SpiWriteRegister(0x05, 0x03); //write 0x03 to the Interrupt Enable 1 register
SpiWriteRegister(0x06, 0x00); //write 0x00 to the Interrupt Enable 2 register
//read interrupt status registers to release all pending interrupts
ItStatus1 = SpiReadRegister(0x03); //read the Interrupt Status1 register
ItStatus2 = SpiReadRegister(0x04); //read the Interrupt Status2 register
}
}
}
}
//reset the RX FIFO
SpiWriteRegister(0x08, 0x02); //write 0x02 to the Operating Function Control 2 register
SpiWriteRegister(0x08, 0x00); //write 0x00 to the Operating Function Control 2 register
RFSetRxMode();
}
}
}</pre>

jackwang

院士

2013-12-25 20:51:19 评分

2楼

没有使用贴代码功能？

Snake0301

高工

2013-12-25 22:06:48 评分

3楼

修饰一下，帅多了、

禅子

菜鸟

2013-12-27 11:44:02 评分

4楼

4432应该是兼容的吧？ Si4438与Si446x收发器产品引脚兼容以及软件兼容哦（是针对全球部署智能电表和智能电网产品而设计的sub-GHz ISM频段产品）。

lili路亚

菜鸟

2014-01-02 14:34:25 评分

5楼

多谢版主帮修饰，确实好看多了！

回LS的：并不完全兼容，下面是我请世强的杨工提供的采用Si4438的部分代码，大家可以参考下，完整的代码可以找深圳世强的FAE杨工要。大家可以对比研究下。

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#include "compiler_defs.h"
#include "c8051f960_defs.h"
#include "hardware_defs.h"
#include "control_IO.h"
#include "spi.h"
#include "Si446x_B0_defs.h"
#include "ezrp_next_api.h"
#include "modem_params.h"
// Define capacitor bank value
#define CAP_BANK_VALUE 0x48 // Capacitor bank value for adjusting the XTAL frequency
// Note that it may varies on different test cards
/*------------------------------------------------------------------------*/
/* GLOBAL variables */
/*------------------------------------------------------------------------*/
// Set up modem parameters database; data is retrieved from modem_params.h header file which is
// automatically generated by the WDS (Wireless Development Suite)
SEG_CODE U8 ModemTrx1[] = {7, MODEM_MOD_TYPE_7};
SEG_CODE U8 ModemTrx2[] = {5, MODEM_CLKGEN_BAND_5};
SEG_CODE U8 ModemTrx3[] = {11, SYNTH_PFDCP_CPFF_11};
SEG_CODE U8 ModemTrx4[] = {12, FREQ_CONTROL_INTE_12};
SEG_CODE U8 ModemRx1[] = {11, MODEM_MDM_CTRL_11};
SEG_CODE U8 ModemRx2[] = {14, MODEM_BCR_OSR_1_14};
SEG_CODE U8 ModemRx3[] = {12, MODEM_AFC_GEAR_12};
SEG_CODE U8 ModemRx4[] = {5, MODEM_AGC_CONTRL_5};
SEG_CODE U8 ModemRx4_1[] = {7, MODEM_AGC_WINDOW_SIZE_7};
SEG_CODE U8 ModemRx5[] = {9, MODEM_FSK4_GAIN1_9};
SEG_CODE U8 ModemRx6[] = {8, MODEM_OOK_PDTC_8};
SEG_CODE U8 ModemRx7[] = {8, MODEM_RAW_SEARCH_8};
SEG_CODE U8 ModemRx8[] = {6, MODEM_ANT_DIV_MODE_6};
SEG_CODE U8 ModemRx9[] = {13, MODEM_CHFLT_RX1_CHFLT_COE13_7_0_13};
SEG_CODE U8 ModemRx10[] = {13, MODEM_CHFLT_RX1_CHFLT_COE4_7_0_13};
SEG_CODE U8 ModemRx11[] = {13, MODEM_CHFLT_RX2_CHFLT_COE13_7_0_13};
SEG_CODE U8 ModemRx12[] = {13, MODEM_CHFLT_RX2_CHFLT_COE4_7_0_13};
/*------------------------------------------------------------------------*/
/* LOCAL function prototypes */
/*------------------------------------------------------------------------*/
void MCU_Init(void);
/*------------------------------------------------------------------------*/
/* MAIN function */
/*------------------------------------------------------------------------*/
void main(void)
{
SEGMENT_VARIABLE(wDelay, U16, SEG_XDATA);
SEGMENT_VARIABLE(bButtonNumber, U8, SEG_XDATA);
BIT fValidPacket;
//initialize the MCU peripherals
MCU_Init();
InitIO();
// Reset the radio
EZRP_PWRDN = 1;
// Wait ~300us (SDN pulse width)
for(wDelay=0; wDelay<330; wDelay++);
// Wake up the chip from SDN
EZRP_PWRDN = 0;
// Wait for POR (power on reset); ~5ms
for(wDelay=0; wDelay<5500; wDelay++);
// Start the radio
abApi_Write[0] = CMD_POWER_UP; // Use API command to power up the radio IC
abApi_Write[1] = 0x01; // Write global control registers
abApi_Write[2] = 0x00; // Write global control registers
bApi_SendCommand(3,abApi_Write); // Send command to the radio IC
// Wait for boot
if (vApi_WaitforCTS()) // Wait for CTS
{
while (1) {} // Stop if radio power-up error
}
// Read ITs, clear pending ones
abApi_Write[0] = CMD_GET_INT_STATUS; // Use interrupt status command
abApi_Write[1] = 0; // Clear PH_CLR_PEND
abApi_Write[2] = 0; // Clear MODEM_CLR_PEND
abApi_Write[3] = 0; // Clear CHIP_CLR_PEND
bApi_SendCommand(4,abApi_Write); // Send command to the radio IC
bApi_GetResponse(8, abApi_Read ); // Make sure that CTS is ready then get the response
// Set TRX parameters of the radio IC; data retrieved from the WDS-generated modem_params.h header file
bApi_SendCommand(ModemTrx1[0],&ModemTrx1[1]); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
bApi_SendCommand(ModemTrx2[0],&ModemTrx2[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemTrx3[0],&ModemTrx3[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemTrx4[0],&ModemTrx4[1]);
vApi_WaitforCTS();
// Set Rx parameters of the radio IC
bApi_SendCommand(ModemRx1[0],&ModemRx1[1]); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
bApi_SendCommand(ModemRx2[0],&ModemRx2[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx3[0],&ModemRx3[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx4[0],&ModemRx4[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx4_1[0],&ModemRx4_1[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx5[0],&ModemRx5[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx6[0],&ModemRx6[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx7[0],&ModemRx7[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx8[0],&ModemRx8[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx9[0],&ModemRx9[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx10[0],&ModemRx10[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx11[0],&ModemRx11[1]);
vApi_WaitforCTS();
bApi_SendCommand(ModemRx12[0],&ModemRx12[1]);
vApi_WaitforCTS();
// Enable packet received and CRC error interrupt only
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_INT_CTL_GROUP; // Select property group
abApi_Write[2] = 4; // Number of properties to be written
abApi_Write[3] = PROP_INT_CTL_ENABLE; // Specify property
abApi_Write[4] = 0x01; // INT_CTL: PH interrupt enabled
abApi_Write[5] = 0x18; // INT_CTL_PH: PH PACKET_RX & CRC2_ERR interrupt enabled
abApi_Write[6] = 0x00; // INT_CTL_MODEM: -
abApi_Write[7] = 0x00; // INT_CTL_CHIP_EN: -
bApi_SendCommand(8,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Configure Fast response registers
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_FRR_CTL_GROUP; // Select property group
abApi_Write[2] = 4; // Number of properties to be written
abApi_Write[3] = PROP_FRR_CTL_A_MODE; // Specify property (1st)
abApi_Write[4] = 0x04; // FRR A: PH IT pending
abApi_Write[5] = 0x06; // FRR B: Modem IT pending
abApi_Write[6] = 0x0A; // FRR C: Latched RSSI
abApi_Write[7] = 0x00; // FRR D: disabled
bApi_SendCommand(8,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
//Set packet content
//Set preamble length
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_PREAMBLE_GROUP; // Select property group
abApi_Write[2] = 1; // Number of properties to be written
abApi_Write[3] = PROP_PREAMBLE_CONFIG_STD_1; // Specify property
abApi_Write[4] = 20; // 20 bits preamble detection threshold
bApi_SendCommand(5,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Set preamble pattern
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_PREAMBLE_GROUP; // Select property group
abApi_Write[2] = 1; // Number of properties to be written
abApi_Write[3] = PROP_PREAMBLE_CONFIG; // Specify property
abApi_Write[4] = 0x31; // Use `1010` pattern, length defined in bytes
bApi_SendCommand(5,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Set sync word
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_SYNC_GROUP; // Select property group
abApi_Write[2] = 3; // Number of properties to be written
abApi_Write[3] = PROP_SYNC_CONFIG; // Specify property
abApi_Write[4] = 0x01; // SYNC_CONFIG: 2 bytes sync word
abApi_Write[5] = 0xB4; // SYNC_BITS_31_24: 1st sync byte: 0x2D; NOTE: LSB transmitted first!
abApi_Write[6] = 0x2B; // SYNC_BITS_23_16: 2nd sync byte: 0xD4; NOTE: LSB transmitted first!
bApi_SendCommand(7,abApi_Write); // Send command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// General packet config (set bit order)
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_PKT_GROUP; // Select property group
abApi_Write[2] = 1; // Number of properties to be written
abApi_Write[3] = PROP_PKT_CONFIG1; // Specify property
abApi_Write[4] = 0x00; // Payload data goes MSB first
bApi_SendCommand(5,abApi_Write); // Send command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Set RSSI latch to sync word
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_MODEM_GROUP; // Select property group
abApi_Write[2] = 1; // Number of properties to be written
abApi_Write[3] = PROP_MODEM_RSSI_CONTROL; // Specify property
abApi_Write[4] = 0x12; // RSSI average over 4 bits, latch at sync detect
bApi_SendCommand(5,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Configure the GPIOs
abApi_Write[0] = CMD_GPIO_PIN_CFG; // Use GPIO pin configuration command
#ifdef ONE_SMA_WITH_RF_SWITCH
// If RF switch is used
// Select Tx state to GPIO2, Rx state to GPIO0
abApi_Write[1] = 0x21; // Configure GPIO0 as Rx state
abApi_Write[2] = 0x13; // Configure GPIO1 as Tx data
abApi_Write[3] = 0x20; // Configure GPIO2 as Tx state
abApi_Write[4] = 0x10; // Configure GPIO3 as Tx data CLK
#else
abApi_Write[1] = 0x10; // Configure GPIO0 as Tx data CLK
abApi_Write[2] = 0x13; // Configure GPIO1 as Tx data
abApi_Write[3] = 0x20; // Configure GPIO2 as Tx state
abApi_Write[4] = 0x21; // Configure GPIO3 as Rx state
#endif
bApi_SendCommand(5,abApi_Write); // Send command to the radio IC
vApi_WaitforCTS();
// Adjust XTAL clock frequency
abApi_Write[0] = CMD_SET_PROPERTY; // Use property command
abApi_Write[1] = PROP_GLOBAL_GROUP; // Select property group
abApi_Write[2] = 1; // Number of properties to be written
abApi_Write[3] = PROP_GLOBAL_XO_TUNE; // Specify property
abApi_Write[4] = CAP_BANK_VALUE; // Set cap bank value to adjust XTAL clock frequency
bApi_SendCommand(5,abApi_Write); // Send command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Read ITs, clear pending ones
abApi_Write[0] = CMD_GET_INT_STATUS; // Use interrupt status command
abApi_Write[1] = 0; // Clear PH_CLR_PEND
abApi_Write[2] = 0; // Clear MODEM_CLR_PEND
abApi_Write[3] = 0; // Clear CHIP_CLR_PEND
bApi_SendCommand(4,abApi_Write); // Send command to the radio IC
bApi_GetResponse(8,abApi_Read); // Get the response
// Start Rx
abApi_Write[0] = CMD_START_RX; // Use start Rx command
abApi_Write[1] = 0; // Set channel number
abApi_Write[2] = 0x00; // Start Rx immediately
abApi_Write[3] = 0x00; // 8 bytes to receive
abApi_Write[4] = 0x08; // 8 bytes to receive
abApi_Write[5] = 0x00; // No change if Rx timeout
abApi_Write[6] = 0x03; // Ready state after Rx
abApi_Write[7] = 0x03; // Ready state if Rx invalid
bApi_SendCommand(8,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
// Turn off LEDs
ClearLed(1);
ClearLed(2);
ClearLed(3);
ClearLed(4);
while(1)
{
if(EZRP_NIRQ == 0)
{
// Read PH IT registers to see the cause for the IT
abApi_Write[0] = CMD_GET_PH_STATUS; // Use packet handler status command
abApi_Write[1] = 0x00; // Dummy byte for a proper CTS response
bApi_SendCommand(2,abApi_Write); // Send command to the radio IC
bApi_GetResponse(1,abApi_Read); // Make sure that CTS is ready then get the response
if((abApi_Read[0] & 0x10) == 0x10) // Check if packet received
{// Packet received
// Get RSSI
bApi_GetFastResponseRegister(CMD_FAST_RESPONSE_REG_C,1,abApi_Read);
// Read the FIFO
bApi_ReadRxDataBuffer(8,abApi_Read);
fValidPacket = 0;
// Check the packet content
if ((abApi_Read[0]=='B') && (abApi_Read[1]=='U') && (abApi_Read[2]=='T') && (abApi_Read[3]=='T') && (abApi_Read[4]=='O') && (abApi_Read[5]=='N'))
{
bButtonNumber = abApi_Read[6] & 0x07; // Get button info
if((bButtonNumber > 0) && (bButtonNumber < 5))
{
SetLed(bButtonNumber); // Turn on the appropriate LED
for(wDelay=0; wDelay<30000; wDelay++); // Wait to show LED
ClearLed(bButtonNumber); // Turn off the corresponding LED
fValidPacket = 1;
}
}
// Packet content is not what was expected
if(fValidPacket == 0)
{
SetLed(1); // Blink all LEDs
SetLed(2);
SetLed(3);
SetLed(4);
for(wDelay=0; wDelay<30000; wDelay++);
ClearLed(1);
ClearLed(2);
ClearLed(3);
ClearLed(4);
}
}
// Read ITs, clear pending ones
abApi_Write[0] = CMD_GET_INT_STATUS; // Use interrupt status command
abApi_Write[1] = 0; // Clear PH_CLR_PEND
abApi_Write[2] = 0; // Clear MODEM_CLR_PEND
abApi_Write[3] = 0; // Clear CHIP_CLR_PEND
bApi_SendCommand(4,abApi_Write); // Send command to the radio IC
bApi_GetResponse(8,abApi_Read); // Get the response
// Start Rx
abApi_Write[0] = CMD_START_RX; // Use start Rx command
abApi_Write[1] = 0; // Set channel number
abApi_Write[2] = 0x00; // Start Rx immediately
abApi_Write[3] = 0x00; // 8 bytes to receive
abApi_Write[4] = 0x08; // 8 bytes to receive
abApi_Write[5] = 0x00; // No change if Rx timeout
abApi_Write[6] = 0x03; // Ready state after Rx
abApi_Write[7] = 0x03; // Ready if Rx invalid
bApi_SendCommand(8,abApi_Write); // Send API command to the radio IC
vApi_WaitforCTS(); // Wait for CTS
}
}
}

来源：https://www.cnblogs.com/zym0805/p/5718811.html

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cca

中断处理