Should the first byte of tx buffer be length byte ?

[uludag2806]

Hi;

I do not want to send the lenght of my buffer. I just want to send exactly my buffer but on my code if ı do not send a size of my buffer first and even if I change the inside of my buffer, it continues to send old data. Even PKTCTRL0 (Packet automation control) is "0x05",it is meaning Infinite packet length mode. So ı do not need to send a size of buffer. But my problem is lets say ı am sending a fener[26] buffer and ı delete the send a size of buffer on cc1101_send_packet function and change the sending data lets say ı made packet[26] and reload program again but it still send old(fener[26]) data. but when ı open the sending size function in cc1101_send_packet function

My codes;

void SpiCWriteBurstReg(uint8_t Addr,uint8_t *Buffer,uint8_t Count) { uint8_t i=0; uint8_t temptxburst[Count+2]; HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_RESET); while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_6) != GPIO_PIN_RESET); // temptxburst[0] = SPI_ReadWrite(Addr|WRITE_BURST); // adreside yanlislikla yazdirdigim yer. temptxburst[0] = Addr|WRITE_BURST; HAL_SPI_Transmit(&hspi1,&temptxburst[0],1,10);

HAL_SPI_Transmit(&hspi1,Buffer,Count,10); // DATA TOPLU GONDERIM

HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_SET); }

void SPiCWriteReg(uint8_t Addr,uint8_t Value) { // SPiCPowerUpReset(); Power_up_reset(); uint8_t Data_Write[2]; Data_Write[0]=Addr; Data_Write[1]=Value; HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_RESET); while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_6) != GPIO_PIN_RESET); HAL_SPI_Transmit(&hspi1,Data_Write,2,10); HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_SET); }

void SpiCStrobe(uint8_t Strobe) { HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_RESET); //CS enable while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_6) != GPIO_PIN_RESET); SPI_ReadWrite(Strobe); HAL_GPIO_WritePin(SPI1_CSn_GPIO_Port, SPI1_CSn_Pin, GPIO_PIN_SET); //CS disable }

void cc1101_send_packet(uint8_t* txBuffer, uint8_t size) {

SpiCStrobe(CCxxx0_SIDLE);

SPiCWriteReg(CCxxx0_TXFIFO, size); //I DO NOT WANT TO SEND SIZE . when i close this program is not working correctly.

SpiCWriteBurstReg(CCxxx0_TXFIFO, txBuffer, size);

SpiCStrobe(CCxxx0_STX); }

uint8_t DataBufferX1[26]= {0x19, 0x44, 0x55, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x65, 0x20, 0x54, 0x75, 0x72, 0x61, 0x6E, 0x20, 0x20, 0x43, 0x43, 0x31, 0x31, 0x30, 0x31, 0x20}; uint8_t fener[26] = {0x66, 0x65, 0x6e, 0x65, 0x72, 0x62, 0x61, 0x68, 0x63, 0x65, 0x20, 0x63, 0x6f, 0x6b, 0x20, 0x79, 0x61, 0x73, 0x61, 0x20, 0x6f, 0x6f, 0x6f, 0x6c, 0x65, 0x79}; uint8_t packet[26] = {0x43, 0x43, 0x31, 0x31, 0x30, 0x31, 0x20, 0x74, 0x61, 0x6d, 0x61, 0x6d, 0x6c, 0x61, 0x6e, 0x64, 0x69, 0x20, 0x59, 0x45, 0x53, 0x53, 0x53, 0x21, 0x21, 0x21};

while (1) { HAL_Delay(500); SpiCStrobe(CCxxx0_SFTX);

cc1101_send_packet(fener,26 );

while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_2) == GPIO_PIN_SET);// while(HAL_GPIO_ReadPin(GDO0_GPIO_Port, GDO0_Pin)); while(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_2) != GPIO_PIN_SET);// while(!HAL_GPIO_ReadPin(GDO0_GPIO_Port, GDO0_Pin));

}

and ı make also ; 1) I made the changes

0x04, // PKTCTRL0 Packet automation control.

0x1A // PKTLEN Packet length (in decimal 26)

2) I delete the sending size of buffer

void cc1101_send_packet(uint8_t* txBuffer, uint8_t size) {

SpiCStrobe(CCxxx0_SIDLE);

// SPiCWriteReg(CCxxx0_TXFIFO, size); *** SpiCWriteBurstReg(CCxxx0_TXFIFO, txBuffer, size);

SpiCStrobe(CCxxx0_STX); }

3) Result;

1. sending data:uint8_t packet[26] = {0x43, 0x43, 0x31, 0x31, 0x30, 0x31, 0x20, 0x74, 0x61, 0x6d, 0x61, 0x6d, 0x6c, 0x61, 0x6e, 0x64, 0x69, 0x20, 0x59, 0x45, 0x53, 0x53, 0x53, 0x21, 0x21, 0x21};

1.receive data: 1A 43 43 31 31 30 31 20 74 61 6D 61 6D 6C 61 6E 64 69 20 59 45 53 53 53 21 21

NOTE: as you see first byte 1A means in decimal 26 so it still send the old data because i did not send the size. i have no idea about how this happened?

2.sending data: fener[26] = {0x66, 0x65, 0x6e, 0x65, 0x72, 0x62, 0x61, 0x68, 0x63, 0x65, 0x20, 0x63, 0x6f, 0x6b, 0x20, 0x79, 0x61, 0x73, 0x61, 0x20, 0x6f, 0x6f, 0x6f, 0x6c, 0x65, 0x79};

2.receive data: 66 43 43 31 31 30 31 20 74 61 6D 61 6D 6C 61 6E 64 69 20 59 45 53 53 53 21 21

NOTE:As you see just change the first byte. first byte is true but the rest of the buffer are old information.

4) But when i use SPiCWriteReg(CCxxx0_TXFIFO, size); (mean send the size of buffer) every message goes true. But ı dont want to send length of buffer