nrf24l01 playload datarate

[pengyong]

When I have a test using nRF24l01+ with STM32, I can only get a playload datarate no more than 450kbps using nRF24l01+ 2M mode. How can increase the playload data rate and what is the maximum for the playload data rate? Thanks.

[pengyong]

Hi,

Thanks for you feedback. 1)The auto ACK NOT enable.I used maximum payload size (32). 2)In the testing, when a packer(32bytes) sent, 300-400us will wait for sending the next.It will take more than 500us to send a single packet.If this were is no wait, the receiver can not get correct packets. 3)The radio capability for the throughput is 2Mbps. In my testing, the sending throughput is much lower the capability .

I also have a test for the EN_AA enabled, Looks the throughput is no more than 500kbps.

In my testing, looks the receiver can not get the data immediately if keep a low error packet rate. The configuration as below: FOR TX: NRF24L01_CE=0;
NRF24L01_Write_Buf(WRITE_REG+TX_ADDR,(u8*)TX_ADDRESS,TX_ADR_WIDTH); NRF24L01_Write_Buf(WRITE_REG+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);

NRF24L01_Write_Reg(WRITE_REG+EN_AA,0x00); 
NRF24L01_Write_Reg(WRITE_REG+EN_RXADDR,0x01); 
//NRF24L01_Write_Reg(WRITE_REG+SETUP_RETR,0x1a);
NRF24L01_Write_Reg(WRITE_REG+SETUP_RETR,0x0);

NRF24L01_Write_Reg(WRITE_REG+RF_CH,120);  
//NRF24L01_Write_Reg(WRITE_REG+RF_SETUP,0x0f);
NRF24L01_Write_Reg(WRITE_REG+RF_SETUP,0x0f); 
//NRF24L01_Write_Reg(WRITE_REG+CONFIG,0x0e); 
NRF24L01_Write_Reg(WRITE_REG+CONFIG,0x02); 
NRF24L01_CE=1;

FOR RX: NRF24L01_CE=0;
NRF24L01_Write_Buf(WRITE_REG+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);

NRF24L01_Write_Reg(WRITE_REG+EN_AA,0x00);    
NRF24L01_Write_Reg(WRITE_REG+EN_RXADDR,0x01);
//NRF24L01_Write_Reg(WRITE_REG+EN_RXADDR,0x00);
NRF24L01_Write_Reg(WRITE_REG+RF_CH,120);	  	  
NRF24L01_Write_Reg(WRITE_REG+RX_PW_P0,RX_PLOAD_WIDTH);
NRF24L01_Write_Reg(WRITE_REG+RF_SETUP,0x0f);
//NRF24L01_Write_Reg(WRITE_REG+CONFIG, 0x0f);
NRF24L01_Write_Reg(WRITE_REG+CONFIG, 0x03);
NRF24L01_CE = 1; 

Is there any unreasonable configuration?

Thanks Yong

[ovrebekk]

Hi Yong

If you take advantage of the possibility to keep CE enabled over multiple packets (up to a maximum time of 4ms) you can reach 1.5Mbps or more in legacy Shockburst mode, yes.

For this to work you have to upload the next packet to the FIFO while the current packet is being transmitted.

Still, it is important to disable the TX temporarily after 4ms, otherwise the carrier frequency might drift out of spec and the packets will be lost.

Best regards