problem with nrf24l01 and stm32 wrong address value is sent

[salar1991]

hi I used the code in this link

https://github.com/MYaqoobEmbedded/STM32-Tutorials/tree/master/Tutorial%2024%20-%20NRF24L01%20Radio%20Transceiver

for communicating with nrf24l01 with stm32 and it worked fine but I wanted to rewrite it in register level so I rewrote the code but I encountered a problem. the default transmitter address should be E7,E7,E7,E7,E7 based on the datasheet but the address that I am getting with uart is something different like 0B,E0,00,C6,30. the RF power is shown 0 dB which is correct and also 4 of receiver pipe addresses are correct. but I don't get the sent characters from the transmitter microcontroller. I attached my code below. what do you think might caused this problem?

the nrf24l01 driver code is about 1000 lines so i can't copy all of it here but the most important functions in this driver code is as follows :

void GPIO_config(void)
{
	//spi config
	RCC->APB2ENR |= (1<<12); /* Enable SPI1 clock */
	RCC->APB2ENR |= (1<<2); // enable GPIOA clock
	RCC->APB2ENR |= (1<<3);
	GPIOA->CRL&=~0xFFF00000; // clear A.5 , A.6 , A.7 
	GPIOA->CRL |=0xB4B00000; // A.5 and A.7 alternate function output A.6 input
	/* Enable SPI in Master Mode, CPOL=0, CPHA=0. */
	/* Clock speed = fPCLK1 / 256 = 280 kHz at 72 MHz PCLK1 clk. */
	SPI1->CR1 = (0 << 0) | // Clock phase
	(0 << 1) | // Clock polarity 
	(1 << 2) | // Master selection
	(5 << 3) | // Baud rate control clock/256
	(1 << 6) | // SPI enable
	(0 << 7) | // Frame format : 0: MSB transmitted first
	(1 << 8) | // Internal slave select
	(1 << 9) | // Software slave management enabled
	(0 << 11); // Data frame format : 0: 8-bit
	SPI1->CR2 = 0x0000;
	//other GPIO config
		 // enable GPIOB clock 
	GPIOB->CRL &= ~0xF; // GPIOB.0 clear
	GPIOB->CRL |= 0x3; // GPIOB.0 output push pull
	GPIOB->CRL &= ~(0xF00F0000); // GPIOB.4 and GPIOB.7 clearing
	GPIOB->CRL |= 0x10010000;	// GPIOB.4 and GPIOB.7 output pushpull 10 MHz
}
 
uint8_t SendBuf (uint8_t *buf, int sz) 
{
 /* Send buffer to SPI interface. */
	int i;										 
 
	for (i = 0; i < sz; i++) 
	{ 
		SPI1->DR = buf[i];
		/* Wait if TXE cleared, Tx FIFO is full. */
		while (!(SPI1->SR & TXE));
		SPI1->DR;
	}
 /* Wait until Tx finished, drain Rx FIFO. */
	while (SPI1->SR & (BSY | RXNE)) 
	{
	SPI1->DR;
	}
	return (1);							 
}
 
uint8_t RecBuf (uint8_t *buf, int sz) {
 /* Receive SPI data to buffer. */
	int i;
 
	for (i = 0; i < sz; i++) 
	{
		SPI1->DR = 0xFF;
		/* Wait if RNE cleared, Rx FIFO is empty. */
		while (!(SPI1->SR & RXNE));
		buf[i] = SPI1->DR;
	}
	return (1);
}
 
//3. Read single byte from a register
uint8_t NRF24_read_register(uint8_t reg)
{
	uint8_t spiBuf[3];
	uint8_t retData;
	//Put CSN low
	NRF24_csn(0);
	//Transmit register address
	spiBuf[0] = reg&0x1F;
	SendBuf(spiBuf,1);
	//Receive data
	RecBuf(&spiBuf[1],1);
	retData = spiBuf[1];
	//Bring CSN high
	NRF24_csn(1);
	return retData;
}
//4. Read multiple bytes register
void NRF24_read_registerN(uint8_t reg, uint8_t *buf, uint8_t len)
{
	uint8_t spiBuf[3];
	//Put CSN low
	NRF24_csn(0);
	//Transmit register address
	spiBuf[0] = reg&0x1F;
	//spiStatus = NRF24_SPI_Write(spiBuf, 1);
	SendBuf(spiBuf,1);
	//Receive data
	RecBuf(buf,len);
	//Bring CSN high
	NRF24_csn(1);
}
//5. Write single byte register
void NRF24_write_register(uint8_t reg, uint8_t value)
{
	uint8_t spiBuf[3];
	//Put CSN low
	NRF24_csn(0);
	//Transmit register address and data
	spiBuf[0] = reg|0x20;
	spiBuf[1] = value;
	SendBuf(spiBuf,2);
	//Bring CSN high
	NRF24_csn(1);
}
//6. Write multipl bytes register
void NRF24_write_registerN(uint8_t reg, const uint8_t* buf, uint8_t len)
{
	uint8_t spiBuf[3];
	//Put CSN low
	NRF24_csn(0);
	//Transmit register address and data
	spiBuf[0] = reg|0x20;
	SendBuf(spiBuf,1);
	SendBuf(spiBuf,len);
	//Bring CSN high
	NRF24_csn(1);
}
 

void NRF24_begin( void)
{ 
	uint8_t pipeAddrVar[6];
	//Copy SPI handle variable
	//Copy Pins and Port variables
	
	//Put pins to idle state
	NRF24_csn(1);
	NRF24_ce(0);
	//5 ms initial delay
	Delay_ms(5);
	
	//**** Soft Reset Registers default values ****//
	NRF24_write_register(0x00, 0x08);
	NRF24_write_register(0x01, 0x3f);
	NRF24_write_register(0x02, 0x03);
	NRF24_write_register(0x03, 0x03);
	NRF24_write_register(0x04, 0x03);
	NRF24_write_register(0x05, 0x02);
	NRF24_write_register(0x06, 0x0f);
	NRF24_write_register(0x07, 0x0e);
	NRF24_write_register(0x08, 0x00);
	NRF24_write_register(0x09, 0x00);
	
	pipeAddrVar[4]=0xE7; pipeAddrVar[3]=0xE7; pipeAddrVar[2]=0xE7; pipeAddrVar[1]=0xE7; pipeAddrVar[0]=0xE7; 
	NRF24_write_registerN(0x0A, pipeAddrVar, 5);
	pipeAddrVar[4]=0xC2; pipeAddrVar[3]=0xC2; pipeAddrVar[2]=0xC2; pipeAddrVar[1]=0xC2; pipeAddrVar[0]=0xC2; 
	NRF24_write_registerN(0x0B, pipeAddrVar, 5);
	NRF24_write_register(0x0C, 0xC3);
	NRF24_write_register(0x0D, 0xC4);
	NRF24_write_register(0x0E, 0xC5);
	NRF24_write_register(0x0F, 0xC6);
	pipeAddrVar[4]=0xE7; pipeAddrVar[3]=0xE7; pipeAddrVar[2]=0xE7; pipeAddrVar[1]=0xE7; pipeAddrVar[0]=0xE7; 
	NRF24_write_registerN(0x10, pipeAddrVar, 5);
	NRF24_write_register(0x11, 0);
	NRF24_write_register(0x12, 0);
	NRF24_write_register(0x13, 0);
	NRF24_write_register(0x14, 0);
	NRF24_write_register(0x15, 0);
	NRF24_write_register(0x16, 0);
	
	NRF24_ACTIVATE_cmd();
	NRF24_write_register(0x1c, 0);
	NRF24_write_register(0x1d, 0);
	printRadioSettings();
	//Initialise retries 15 and delay 1250 usec
	NRF24_setRetries(15, 15);
	//Initialise PA level to max (0dB)
	NRF24_setPALevel(RF24_PA_0dB);
	//Initialise data rate to 1Mbps
	NRF24_setDataRate(RF24_2MBPS);
	//Initalise CRC length to 16-bit (2 bytes)
	NRF24_setCRCLength(RF24_CRC_16);
	//Disable dynamic payload
	NRF24_disableDynamicPayloads();
	//Set payload size
	NRF24_setPayloadSize(32);
	
	//Reset status register
	NRF24_resetStatus();
	//Initialise channel to 76
	NRF24_setChannel(76);
	//Flush buffers
	NRF24_flush_tx();
	NRF24_flush_rx();
	
	NRF24_powerDown();
	
}

the main code of the receiver :

#include "MY_NRF24.h"
#include "nRF24L01.h"
#include "usart.h"
#include <stm32f10x.h>
 
uint64_t Rxpipeaddrs=0x11223344AA;
char myRxData[50];
char * buffer;
 
int main()
{
usart_init();
usart_sendstring("salam");
GPIO_config();
SysTick_Config(SystemCoreClock/1000); // setup systick timer for 1ms interrupts
NRF24_begin();
 
printRadioSettings();
NRF24_setAutoAck(false);
NRF24_setChannel(52);
NRF24_setPayloadSize(32);
NRF24_openReadingPipe(1,Rxpipeaddrs);
NRF24_startListening();
 
 
 
while(1)
{
 if (NRF24_available()) 
 {
 NRF24_read(myRxData,32);
// myRxData[32]='\r'; myRxData[32+1]='\n';
 usart_sendstring(myRxData);
 buffer=strstr(myRxData,"123456789");
 if (buffer)
 {
 
 usart_sendstring("successful");
 
 
 }
 } 
}
 
 
 
 
}

the transmitter main code :

#include "usart.h"
#include "MY_NRF24.h"
#include "nRF24L01.h"
#include <stm32f10x.h>
uint64_t Txpipeaddrs=0x11223344AA;
uint8_t myTxdata[32]="123456789";
int main ()
{
usart_init();
GPIO_config();
SysTick_Config(SystemCoreClock/1000); // setup systick timer for 1ms interrupts
NRF24_begin();
 
printRadioSettings();
 
NRF24_stopListening();
NRF24_openWritingPipe(Txpipeaddrs);
NRF24_setAutoAck(false);
NRF24_setChannel(52);
 
NRF24_setPayloadSize(32);
 
while (1)
{
 
 
 
if (NRF24_write(myTxdata,32))
 {
 usart_sendstring("transmitted successfully");
 
 }
 Delay_ms(1000);
 
 
 
 
 
 
 
 
 
}
 
 
 

[TDK]

> address should be E7,E7,E7,E7,E7 based on the datasheet but the address that I am getting with uart is something different like 0B,E0,00,C6,30.

With UART or with SPI?

It's a little hard to parse all the complexity here. Not sure anyone is going to want to do that for you.

If you can view the data on the SPI/UART lines with a scope or logic analyzer, it should confirm if the issue is with the software or not.

[Tesla DeLorean]

>> but I wanted to rewrite it in register level so I rewrote the code

Ok, but you're likely to be on your own.

Perhaps try slowly merging in your code changes to the working fork, and determine where your translation isn't working. Could do it a few routines at a time, or via bisection.