uint8_t NRF24L01_Init(uint8_t channel, uint8_t payload_size) { /* Max payload is 32bytes */ if (payload_size > 32) { payload_size = 32; } /* Fill structure */ NRF24L01_Struct.Channel = !channel; /* Set channel to some different value for NRF24L01_SetChannel() function */ NRF24L01_Struct.PayloadSize = payload_size; NRF24L01_Struct.OutPwr = NRF24L01_OutputPower_0dBm; NRF24L01_Struct.DataRate = NRF24L01_DataRate_2M; /* Reset nRF24L01+ to power on registers values */ NRF24L01_SoftwareReset(); /* Channel select */ NRF24L01_SetChannel(channel); /* Set pipeline to max possible 32 bytes */ NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P0, NRF24L01_Struct.PayloadSize); // Auto-ACK pipe NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P1, NRF24L01_Struct.PayloadSize); // Data payload pipe NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P2, NRF24L01_Struct.PayloadSize); NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P3, NRF24L01_Struct.PayloadSize); NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P4, NRF24L01_Struct.PayloadSize); NRF24L01_WriteRegister(NRF24L01_REG_RX_PW_P5, NRF24L01_Struct.PayloadSize); /* Set RF settings (2mbps, output power) */ NRF24L01_SetRF(NRF24L01_Struct.DataRate, NRF24L01_Struct.OutPwr); /* Config register */ NRF24L01_WriteRegister(NRF24L01_REG_CONFIG, NRF24L01_CONFIG); /* Enable auto-acknowledgment for all pipes */ NRF24L01_WriteRegister(NRF24L01_REG_EN_AA, 0x3F); /* Enable RX addresses */ NRF24L01_WriteRegister(NRF24L01_REG_EN_RXADDR, 0x3F); /* Auto retransmit delay: 1000 (4x250) us and Up to 15 retransmit trials */ NRF24L01_WriteRegister(NRF24L01_REG_SETUP_RETR, 0x4F); /* Dynamic length configurations: No dynamic length */ 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 */ NRF24L01_PowerUpRx(); /* Return OK */ return 1; }
void NRF24L01_Transmit(uint8_t *data) { uint8_t count = NRF24L01_Struct.PayloadSize; /* Chip enable put to low, disable it */ NRF24L01_CE_LOW; /* Go to power up tx mode */ NRF24L01_PowerUpTx(); /* Clear TX FIFO from NRF24L01+ */ NRF24L01_FLUSH_TX(NRF24L01_SPI); /* Send payload to nRF24L01+ */ NRF24L01_CSN_LOW; /* Send write payload command */ SPI_Send(NRF24L01_SPI, NRF24L01_W_TX_PAYLOAD_MASK); /* Fill payload with data*/ SPI_WriteMulti(NRF24L01_SPI, data, count); /* Disable SPI */ NRF24L01_CSN_HIGH; /* Send data! */ NRF24L01_CE_HIGH; }