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器件型号：CC1120 工具与软件：
您好！
我需要使用 CC1120在可变数据包长度模式下发送大于128字节的数据包。
我已按如下方式设置 GPIO：
- GPIO0配置为 GPIO0_CFG = 0x00。 上升沿中断设置标志"RxFifoThresholdExced"
- GPIO2设置为 GPIO2_CFG = 0x06。 下降沿中断设置标志"RxTxEndOfPacket"
下面的代码适用于低于#define RX_FIFO_THRESHOLD_SIZE (设置为120)的数据包长度
我无法解决的问题是 CC1120 GPIO0线路上偶尔会出现毛刺脉冲。
下图显示了这些问题。 毛刺脉冲信号直接在 GPIO0输出上获取。
CC1120上的不同 GPIO 输出是否存在任何限制？
我已经在这上面呆了几天,我是不知道的想法。
下面：红色低电平表示远程 Tx 正在发送
这是 GPIO0低脉冲的特写
代码：
/**********************************************************************************************
* Function: CC1120_ReceiveData
* Purpose: Receive a packet of FSK data. Manage FIFO to ensure no overflow occurs.
* Max Packet size is 255 bytes (less 2 if PKT_CFG1.APPEND_STATUS enabled)
* Return: 0 for timeout or no invalid CRC etc.
* 1..255 indicating packet size
//Setup GPIOx for rising edge interrupt on RXFIFO_THR.
**********************************************************************************************/
u8 CC1120_ReceiveData(u8 *pData)
{
u8 * pBuffer = pData;
u8 length = 0;
u8 BytesRemaining =0;
u32 startTime = HAL_GetTick(); // Get the current system tick
RxRssi = 0;
RxLqi =0;
RxCrcOK = 0;
CC1120_Strobe(CC1120_SIDLE);
// Reset RxFIFO IFF overflow, underflow
if (CC1120_ReadRegister(MODEM_STATUS1) & (MOD_S1_RXFIFO_OVERFLOW | MOD_S1_RXFIFO_UNDERFLOW ))
{
CC1120_Strobe(CC1120_SIDLE); // Must be in idle state
CC1120_Strobe(CC1120_CMD_SFRX); // Flush RX FIFO. Places CC1120 into IDLE mode
CC1120_Initialise(); // Reinit device
Println("RxFIFO flushed", RED);
RxFifoThresholdExceeded = FALSE;
RxTxEndOfPacket = FALSE;
}
CC1120_ReadRegister(NUM_RXBYTES); // ****** "NUM_RXBYTES or RX_LAST should be read before strobing SRX" *******
CC1120_Strobe(CC1120_CMD_SRX); // Put into RX mode
while(1) // Now receive the data
{
// Case 1: FIFO threshold is exceeded (set by rising edge on GPIO0. GPIO0_CFG = 0)
if (RxFifoThresholdExceeded ) // Flag set by RISING edge from CC1120 GPIO1 - Set as GPIO0_CFG = 0
{
RxFifoThresholdExceeded = FALSE;
// If the length byte hasn't been received yet, read the packet length
if (!length)
{
length = CC1120_ReadRegister(CC1120_FIFO); // Read packet length (Fist byte in packet)
BytesRemaining = length; // length byte doesn't include the first byte in VPM
}
CC1120_ReadBurst(CC1120_FIFO, pData, RX_FIFO_THRESHOLD_SIZE); // Read the RxFIFO contents
BytesRemaining -= RX_FIFO_THRESHOLD_SIZE;
pData += RX_FIFO_THRESHOLD_SIZE;
}
// Case 2: End of packet detected (set by falling edge on GPIO2 - Set as GPIO2_CFG = 6)
else if (RxTxEndOfPacket)
{
RxTxEndOfPacket = FALSE;
if (!length) // Extract length.. DON'T include with data
{
length = CC1120_ReadRegister(CC1120_FIFO); // Read packet length from FIFO
BytesRemaining = length; // length byte doesn't include the first byte in VPM
}
// Process data from the two status bytes appended to the data
RxRssi =CC1120_ReadRegister(CC1120_FIFO); // Read remaining contents
RxLqi =CC1120_ReadRegister(CC1120_FIFO); // Read remaining contents
RxCrcOK = RxLqi & 0x80;
RxLqi &= 0x7F; // Keep 7 LSbits
if (!RxCrcOK) // MSBit is CRC
length =0; // Indicates a bad CRC == packet no good
break; // We're done!
}
if ((HAL_GetTick() - startTime) >= CC1120_RX_TIMEOUT_1S)
{
length = 0; // Timeout
break;
}
}
while(1);
return length;
}
