uint8_t TM_NRF24L01_Init(uint8_t channel, uint8_t payload_size) {
//Initialize CE and CSN pins
TM_NRF24L01_InitPins();
//Initialize SPI
TM_SPI_Init(NRF24L01_SPI, NRF24L01_SPI_PINS);
//Max payload is 32bytes
if (payload_size > 32) {
payload_size = 32;
}
TM_NRF24L01_Struct.Channel = channel;
TM_NRF24L01_Struct.PayloadSize = payload_size;
TM_NRF24L01_Struct.OutPwr = TM_NRF24L01_OutputPower_0dBm;
TM_NRF24L01_Struct.DataRate = TM_NRF24L01_DataRate_2M;
//Reset nRF24L01+ to power on registers values
TM_NRF24L01_SoftwareReset();
//Channel select
TM_NRF24L01_SetChannel(TM_NRF24L01_Struct.Channel);
//Set pipeline to max possible 32 bytes
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P0, TM_NRF24L01_Struct.PayloadSize); // Auto-ACK pipe
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P1, TM_NRF24L01_Struct.PayloadSize); // Data payload pipe
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P2, 0x00);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P3, 0x00);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P4, 0x00);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P5, 0x00);
//Set RF settings (2mbps, output power)
TM_NRF24L01_SetRF(TM_NRF24L01_Struct.DataRate, TM_NRF24L01_Struct.OutPwr);
//Config register
TM_NRF24L01_WriteRegister(NRF24L01_REG_CONFIG, NRF24L01_CONFIG);
//Enable auto-acknowledgment for all pipes
TM_NRF24L01_WriteRegister(NRF24L01_REG_EN_AA, 0xFF);
// Enable RX addresses
TM_NRF24L01_WriteRegister(NRF24L01_REG_EN_RXADDR, 0xFF);
//Auto retransmit delay: 1000 (4x250) us and Up to 15 retransmit trials
TM_NRF24L01_WriteRegister(NRF24L01_REG_SETUP_RETR, 0x4F);
// Dynamic length configurations: No dynamic length
TM_NRF24L01_WriteRegister(NRF24L01_REG_DYNPD, (0 << NRF24L01_DPL_P0) | (0 << NRF24L01_DPL_P1) | (0 << NRF24L01_DPL_P2) | (0 << NRF24L01_DPL_P3) | (0 << NRF24L01_DPL_P4) | (0 << NRF24L01_DPL_P5));
//Clear FIFOs
NRF24L01_FLUSH_TX;
NRF24L01_FLUSH_RX;
//Go to RX mode
TM_NRF24L01_PowerUpRx();
return 1;
}
int main(void) {
/* Init system clock for maximum system speed */
TM_RCC_InitSystem();
/* Init HAL layer */
HAL_Init();
/* Init leds */
TM_DISCO_LedInit();
/* Init button */
TM_DISCO_ButtonInit();
/* Initialize USART, TX: PB6, RX: PB7 */
TM_USART_Init(USART1, TM_USART_PinsPack_2, 115200);
/* Initialize NRF24L01+ on channel 15 and 32bytes of payload */
/* By default 2Mbps data rate and 0dBm output power */
/* NRF24L01 goes to RX mode by default */
TM_NRF24L01_Init(15, 32);
/* Set RF settings, Data rate to 2Mbps, Output power to -18dBm */
TM_NRF24L01_SetRF(TM_NRF24L01_DataRate_2M, TM_NRF24L01_OutputPower_M18dBm);
/* Set my address, 5 bytes */
TM_NRF24L01_SetMyAddress(MyAddress);
/* Set TX address, 5 bytes */
TM_NRF24L01_SetTxAddress(TxAddress);
while (1) {
/* If data is ready on NRF24L01+ */
if (TM_NRF24L01_DataReady()) {
/* Get data from NRF24L01+ */
TM_NRF24L01_GetData(dataIn);
/* Start send */
TM_DISCO_LedOn(LED_GREEN);
/* Send it back, automatically goes to TX mode */
TM_NRF24L01_Transmit(dataIn);
/* Wait for data to be sent */
do {
/* Wait till sending */
transmissionStatus = TM_NRF24L01_GetTransmissionStatus();
} while (transmissionStatus == TM_NRF24L01_Transmit_Status_Sending);
/* Send done */
TM_DISCO_LedOff(LED_GREEN);
/* Go back to RX mode */
TM_NRF24L01_PowerUpRx();
}
}
}
uint8_t TM_NRF24L01_Init(uint8_t channel, uint8_t payload_size) {
/* Initialize CE and CSN pins */
TM_NRF24L01_InitPins();
/* Initialize SPI */
TM_SPI_Init(NRF24L01_SPI, NRF24L01_SPI_PINS);
/* Max payload is 32bytes */
if (payload_size > 32) {
payload_size = 32;
}
/* Fill structure */
TM_NRF24L01_Struct.Channel = !channel; /* Set channel to some different value for TM_NRF24L01_SetChannel() function */
TM_NRF24L01_Struct.PayloadSize = payload_size;
TM_NRF24L01_Struct.OutPwr = TM_NRF24L01_OutputPower_0dBm;
TM_NRF24L01_Struct.DataRate = TM_NRF24L01_DataRate_2M;
/* Reset nRF24L01+ to power on registers values */
TM_NRF24L01_SoftwareReset();
/* Channel select */
TM_NRF24L01_SetChannel(channel);
/* Set pipeline to max possible 32 bytes */
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P0, TM_NRF24L01_Struct.PayloadSize); // Auto-ACK pipe
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P1, TM_NRF24L01_Struct.PayloadSize); // Data payload pipe
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P2, TM_NRF24L01_Struct.PayloadSize);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P3, TM_NRF24L01_Struct.PayloadSize);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P4, TM_NRF24L01_Struct.PayloadSize);
TM_NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P5, TM_NRF24L01_Struct.PayloadSize);
/* Set RF settings (2mbps, output power) */
TM_NRF24L01_SetRF(TM_NRF24L01_Struct.DataRate, TM_NRF24L01_Struct.OutPwr);
/* Config register */
TM_NRF24L01_WriteRegister(NRF24L01_REG_CONFIG, NRF24L01_CONFIG);
/* Enable auto-acknowledgment for all pipes */
TM_NRF24L01_WriteRegister(NRF24L01_REG_EN_AA, 0x3F);
/* Enable RX addresses */
TM_NRF24L01_WriteRegister(NRF24L01_REG_EN_RXADDR, 0x3F);
/* Auto retransmit delay: 1000 (4x250) us and Up to 15 retransmit trials */
TM_NRF24L01_WriteRegister(NRF24L01_REG_SETUP_RETR, 0x4F);
/* Dynamic length configurations: No dynamic length */
TM_NRF24L01_WriteRegister(NRF24L01_REG_DYNPD, (0 << NRF24L01_DPL_P0) | (0 << NRF24L01_DPL_P1) | (0 << NRF24L01_DPL_P2) | (0 << NRF24L01_DPL_P3) | (0 << NRF24L01_DPL_P4) | (0 << NRF24L01_DPL_P5));
/* Clear FIFOs */
NRF24L01_FLUSH_TX;
NRF24L01_FLUSH_RX;
/* Clear interrupts */
NRF24L01_CLEAR_INTERRUPTS;
/* Go to RX mode */
TM_NRF24L01_PowerUpRx();
/* Return OK */
return 1;
}
int main(void) {
TM_NRF24L01_Transmit_Status_t transmissionStatus;
char str[40];
//Initialize system
SystemInit();
//Initialize system and Delay functions
TM_DELAY_Init();
//Initialize onboard leds
TM_DISCO_LedInit();
//Initialize USART, TX: PB6, RX: PB7
TM_USART_Init(USART1, TM_USART_PinsPack_2, 115200);
//Initialize NRF24L01+ on channel 15 and 32bytes of payload
//By default 2Mbps data rate and 0dBm output power
//NRF24L01 goes to RX mode by default
TM_NRF24L01_Init(15, 32);
//Set 2MBps data rate and -18dBm output power
TM_NRF24L01_SetRF(TM_NRF24L01_DataRate_2M, TM_NRF24L01_OutputPower_M18dBm);
//Set my address, 5 bytes
TM_NRF24L01_SetMyAddress(MyAddress);
//Set TX address, 5 bytes
TM_NRF24L01_SetTxAddress(TxAddress);
//Reset counter
TM_DELAY_SetTime(0);
while (1) {
//Every 2 seconds
if (TM_DELAY_Time() > 2000000) {
//Fill data with something
sprintf((char *)dataOut, "abcdefghijklmnoszxABCDEFCBDA");
//Display on USART
TM_USART_Puts(USART1, "pinging: ");
//Reset time, start counting microseconds
TM_DELAY_SetTime(0);
//Transmit data, goes automatically to TX mode
TM_NRF24L01_Transmit(dataOut);
TM_DISCO_LedOn(LED_PIN);
//Wait for data to be sent
do {
transmissionStatus = TM_NRF24L01_GetTransmissionStatus();
} while (transmissionStatus == TM_NRF24L01_Transmit_Status_Sending);
TM_DISCO_LedOff(LED_PIN);
//Go back to RX mode
TM_NRF24L01_PowerUpRx();
//Wait received data, wait max 100ms, if time is larger, than data was probably lost
while (!TM_NRF24L01_DataReady() && TM_DELAY_Time() < 100000);
//Format time
sprintf(str, "%d us", TM_DELAY_Time());
//Show ping time
TM_USART_Puts(USART1, str);
//Get data from NRF2L01+
TM_NRF24L01_GetData(dataIn);
//Check transmit status
if (transmissionStatus == TM_NRF24L01_Transmit_Status_Ok) {
//Transmit went OK
TM_USART_Puts(USART1, ": OK\n\r");
} else if (transmissionStatus == TM_NRF24L01_Transmit_Status_Lost) {
//Message was LOST
TM_USART_Puts(USART1, ": LOST\n\r");
} else {
//This should never happen
TM_USART_Puts(USART1, ": SENDING\n\r");
}
}
}
}
