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NRF24.c
205 lines (178 loc) · 4.86 KB
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NRF24.c
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#include <stddef.h>
#include "efm32.h"
#include "NRF24.h"
#include "nRF24L01.h"
#include "efm32_usart.h"
#include "efm32_emu.h"
//#include "rtc.h"
#include "config.h"
#include "nrf24_config.h"
void NRF_Delay()
{
volatile int i;
for (i = 0; i < 100000; i++) {};
}
uint8_t NRF_Status(void)
{
volatile uint8_t blah;
NRF_CSN_lo;
while((NRF_USART->STATUS & USART_STATUS_RXDATAV)) {
blah = NRF_USART->RXDATA;
}
while(!(NRF_USART->STATUS & USART_STATUS_TXBL));
NRF_USART->TXDATA = 0xFF;
while (!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
NRF_CSN_hi;
return USART_Rx(NRF_USART);
}
uint8_t NRF_ReadByte(uint8_t cmd)
{
volatile uint8_t blah;
NRF_CSN_lo;
while((NRF_USART->STATUS & USART_STATUS_RXDATAV)) {
blah = NRF_USART->RXDATA;
}
while(!(NRF_USART->STATUS & USART_STATUS_TXBL));
NRF_USART->TXDATA = cmd;
while(!(NRF_USART->STATUS & USART_STATUS_TXC));
USART_Rx(NRF_USART);
NRF_USART->TXDATA = 0x00;
while (!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
NRF_CSN_hi;
return USART_Rx(NRF_USART);
}
uint8_t NRF_ReadRegister(uint8_t reg)
{
return NRF_ReadByte(reg | NRF_R_REGISTER);
}
void NRF_WriteRegister(uint8_t reg, uint8_t data)
{
NRF_SendCommand((reg | NRF_W_REGISTER), data);
}
void NRF_WriteRegisterMulti(uint8_t reg, uint8_t bytes, uint8_t *data)
{
NRF_SendPayload((NRF_W_REGISTER | reg), bytes, data);
}
void NRF_SendPayload(uint8_t reg, uint8_t bytes, uint8_t *data)
{
NRF_CSN_lo;
volatile uint8_t blah;
while(!(NRF_USART->STATUS & USART_STATUS_TXBL));
NRF_USART->TXDATA = reg;
while(!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
blah = NRF_USART->RXDATA;
for (int i = 0; i < bytes; i++) {
while(!(NRF_USART->STATUS & USART_STATUS_TXBL));
NRF_USART->TXDATA = data[i];
while(!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
blah = NRF_USART->RXDATA;
}
NRF_CSN_hi;
}
void NRF_ReceivePayload(uint8_t cmd, uint8_t bytes, uint8_t *buf)
{
NRF_CSN_lo;
NRF_USART->CMD = USART_CMD_CLEARRX;
USART_Tx(NRF_USART, cmd);
USART_Rx(NRF_USART);
for (int i = 0; i < bytes; i++) {
USART_Tx(NRF_USART, 0xFF);
buf[i] = USART_Rx(NRF_USART);
}
//while(!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
NRF_CSN_hi;
}
void NRF_SendCommand(uint8_t cmd, uint8_t data)
{
NRF_CSN_lo;
while(!(NRF_USART->STATUS & USART_STATUS_TXBL));
NRF_USART->TXDATA = cmd;
while(!(NRF_USART->STATUS & USART_STATUS_TXC));
USART_Rx(NRF_USART);
NRF_USART->TXDATA = data;
while (!(NRF_USART->STATUS & USART_STATUS_TXC)) ;
NRF_CSN_hi;
}
void NRF_SetupTX(void)
{
uint8_t addr_array[5];
NRF_CE_lo;
NRF_WriteRegister(NRF_CONFIG, 0x0C);
//NRF_WriteRegister(NRF_EN_AA, 0x3F); // AutoAcknowledge
NRF_WriteRegister(NRF_EN_AA, 0x3F);
NRF_WriteRegister(NRF_EN_RXADDR, 0x3F); // Receive Pipe 0 enabled
NRF_WriteRegister(NRF_SETUP_RETR, 15); // Retransmits
NRF_WriteRegister(NRF_SETUP_AW, 0x03); // Address Width (5 bytes)
NRF_WriteRegister(NRF_RF_SETUP, 0x0F); // RF Setup
//NRF_WriteRegister(NRF_RF_SETUP, 0x08); // -28dB
NRF_WriteRegister(NRF_RF_CH, NODE_CH); // RF Channel
NRF_WriteRegister(NRF_RX_PW_P0, 32); // RX Payload Width
NRF_WriteRegister(NRF_FEATURE, 0x01);
#if NODE_ID == 1
addr_array[0] = 0xE7;
addr_array[1] = 0xE7;
addr_array[2] = 0xE7;
addr_array[3] = 0xE7;
addr_array[4] = 0xE7;
#else
addr_array[0] = 0xC0 + NODE_ID;
addr_array[1] = 0xC2;
addr_array[2] = 0xC2;
addr_array[3] = 0xC2;
addr_array[4] = 0xC2;
#endif
NRF_WriteRegisterMulti(NRF_TX_ADDR, 5, addr_array);
NRF_WriteRegisterMulti(NRF_RX_ADDR_P0, 5, addr_array);
//NRF_WriteRegister(NRF_RX_ADDR_P1, 2);
NRF_WriteRegister(NRF_STATUS, 0x7E); // Clear Interrupts
//NRF_WriteRegister(NRF_CONFIG, 0x0E); // Power Up, Transmitter
NRF_SendCommand(NRF_FLUSH_TX, 0xFF);
NRF_WriteRegister(NRF_CONFIG, 0x0E);
}
void NRF_EnableRX(void)
{
NRF_WriteRegister(NRF_STATUS, 0x7E);
NRF_WriteRegister(NRF_CONFIG, 0x0F);
NRF_SendCommand(NRF_FLUSH_RX, 0xFF);
for (int i =0; i < 2; i++) {
NRF_Delay();
}
NRF_CE_hi;
for (int i =0; i < 2; i++) {
NRF_Delay();
}
NRF_SendCommand(NRF_FLUSH_RX, 0xFF);
}
void CE_Lo_TriggerFunc(void)
{
NRF_CE_lo;
}
void NRF_TransmitPacket(uint8_t bytes, uint8_t *data)
{
NRF_WriteRegister(NRF_CONFIG, 0x0E); // Power Up, Transmitter
NRF_SendPayload(NRF_W_TX_PAYLOAD_NOACK, bytes, data);
NRF_CE_hi;
}
void NRF_PowerDown(void)
{
GPIO->P[NRF_RXEN_PORT].DOUT &= ~(1 << NRF_RXEN_PIN);
NRF_WriteRegister(NRF_CONFIG, NRF_ReadRegister(NRF_CONFIG) & (~0x02));
}
void NRF_PowerUp(void)
{
NRF_WriteRegister(NRF_CONFIG, NRF_ReadRegister(NRF_CONFIG) | 0x02);
}
void NRF_Carrier(void)
{
volatile int j;
NRF_CE_lo;
NRF_WriteRegister(NRF_CONFIG, 0x00);
for(j = 0; j < 500000; j++);
NRF_WriteRegister(NRF_CONFIG, 0x02);
NRF_WriteRegister(NRF_EN_AA, 0x00);
NRF_WriteRegister(NRF_SETUP_RETR, 0x00);
for(j = 0; j < 5000; j++);
NRF_WriteRegister(NRF_RF_SETUP, 0x9E);
NRF_WriteRegister(NRF_RF_CH, NODE_CH);
NRF_CE_hi;
}