int main(void) {
//
// Enable lazy stacking for interrupt handlers. This allows floating-point
// instructions to be used within interrupt handlers, but at the expense of
// extra stack usage.
//
FPULazyStackingEnable();
FPUEnable();
//
// Set the clocking to run directly from the crystal.
// Clock to 80MHZ
//
SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
SYSCTL_OSC_MAIN);
IntMasterEnable();
//set up the radio
if( !nrf24l01p_setup(&nrf, GPIO_PORTC_BASE, GPIO_PIN_4, SSI0_BASE) ){
//we couldn't communicate with the radio
return 1;
}
nrf24l01p_set_PA_level(&nrf, RF24_PA_LOW);
nrf24l01p_open_writing_pipe(&nrf, addresses[0]);
nrf24l01p_open_reading_pipe(&nrf, 1,addresses[1]);
nrf24l01p_start_listening(&nrf);
while(1){
if (nrf24l01p_available(&nrf)) {
uint32_t got_time;
// Variable for the received timestamp
while (nrf24l01p_available(&nrf)) { // While there is data ready
nrf24l01p_read(&nrf, &got_time, sizeof(uint32_t)); // Get the payload
}
nrf24l01p_stop_listening(&nrf); // First, stop listening so we can talk
nrf24l01p_write(&nrf, &got_time, sizeof(uint32_t)); // Send the final one back.
nrf24l01p_start_listening(&nrf); // Now, resume listening so we catch the next packets.
}
//give it a little space
SysCtlDelay((SysCtlClockGet() >> 12) * 5);
}
return 0;
}
int main(void)
{
uint8_t buf[NRF24L01P_PAYLOAD_WIDTH];
uint32_t counter = 0;
#if 0
uint8_t x;
#endif
/* setup spi first */
spi_setup_master();
spi_set_sck_freq(SPI_SCK_FREQ_FOSC2);
uart_setup();
nrf24l01p_setup();
/* sparkfun usb serial board configuration */
/* NOTE: nrf24l01p_enable_crc8(); for nrf24l01p board */
/* nrf24l01p_enable_crc16(); */
nrf24l01p_disable_crc();
/* auto ack disabled */
/* auto retransmit disabled */
/* 4 bytes payload */
/* 1mbps, 0dbm */
/* nrf24l01p_set_rate(NRF24L01P_RATE_1MBPS); */
nrf24l01p_set_rate(NRF24L01P_RATE_2MBPS);
/* nrf24l01p_set_rate(NRF24L01P_RATE_250KBPS); */
/* channel 2 */
nrf24l01p_set_chan(2);
/* 5 bytes addr width */
/* nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_5); */
nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_3);
/* rx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_RX_ADDR_P0);
/* tx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_TX_ADDR);
/* enable tx no ack command */
nrf24l01p_enable_tx_noack();
nrf24l01p_powerdown_to_standby();
nrf24l01p_standby_to_tx();
if (nrf24l01p_is_tx_empty() == 0) nrf24l01p_flush_tx();
#if 0
uart_write((uint8_t*)"tx side\r\n", 9);
uart_write((uint8_t*)"press space\r\n", 13);
uart_read_uint8(&x);
uart_write((uint8_t*)"starting\r\n", 10);
#endif
/* enable interrupts */
sei();
while (1)
{
if ((++counter) != (200000UL / 8UL)) continue ;
counter = 0;
make_pattern(buf);
nrf24l01p_write_tx_noack_zero(buf);
nrf24l01p_complete_tx_noack_zero();
while (nrf24l01p_is_tx_irq() == 0) ;
}
return 0;
}
int main(void)
{
uint16_t counter;
uint8_t x;
#define CONFIG_CHECK 0
#if CONFIG_CHECK
uint16_t error;
#endif
/* setup spi first */
spi_setup_master();
spi_set_sck_freq(SPI_SCK_FREQ_FOSC2);
uart_setup();
/* setup timer1, normal mode, interrupt on match 0xffff */
OCR1A = 0xffff;
TCCR1A = 0;
TCCR1B = 0;
TCCR1C = 0;
TIMSK1 = 1 << 1;
/* enable interrupts */
sei();
nrf24l01p_setup();
/* sparkfun usb serial board configuration */
/* NOTE: nrf24l01p_enable_crc8(); for nrf24l01p board */
/* nrf24l01p_enable_crc16(); */
nrf24l01p_disable_crc();
/* auto ack disabled */
/* auto retransmit disabled */
/* 4 bytes payload */
/* 1mbps, 0dbm */
/* nrf24l01p_set_rate(NRF24L01P_RATE_1MBPS); */
nrf24l01p_set_rate(NRF24L01P_RATE_2MBPS);
/* nrf24l01p_set_rate(NRF24L01P_RATE_250KBPS); */
/* channel 2 */
nrf24l01p_set_chan(2);
/* 5 bytes addr width */
/* nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_5); */
nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_3);
/* rx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_RX_ADDR_P0);
/* tx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_TX_ADDR);
/* enable tx no ack command */
nrf24l01p_enable_tx_noack();
nrf24l01p_powerdown_to_standby();
uart_write((uint8_t*)"rx side\r\n", 9);
redo_receive:
#if CONFIG_CHECK
error = 0;
#endif
counter = 0;
is_timer1_irq = 0;
uart_write((uint8_t*)"press space\r\n", 13);
uart_read_uint8(&x);
uart_write((uint8_t*)"starting\r\n", 10);
nrf24l01p_standby_to_rx();
/* wait for the starting packet */
if (nrf24l01p_is_rx_full()) nrf24l01p_flush_rx();
while (nrf24l01p_is_rx_irq() == 0) ;
nrf24l01p_read_rx();
/* clock source disabled, safe to access 16 bits counter */
TCNT1 = 0;
/* prescaler set to 256 */
/* interrupt every 16000000 / (65535 * 256) = 0.954 s */
TCCR1B = 1 << 2;
while (1)
{
if (is_timer1_irq == 1)
{
break ;
}
else if (nrf24l01p_is_rx_irq())
{
#if CONFIG_CHECK
uint8_t i;
for (i = 0; i < NRF24L01P_PAYLOAD_WIDTH; ++i)
nrf24l01p_cmd_buf[i] = 0x00;
#endif
nrf24l01p_read_rx();
#if CONFIG_CHECK
for (i = 0; i < NRF24L01P_PAYLOAD_WIDTH; ++i)
{
if (nrf24l01p_cmd_buf[i] != (0x2a + i))
{
++error;
break ;
}
}
#endif
++counter;
}
}
/* print counter */
uart_write((uint8_t*)"counter: ", 9);
uart_write((uint8_t*)uint16_to_string(counter), 4);
uart_write((uint8_t*)"\r\n", 2);
#if CONFIG_CHECK
/* print error */
uart_write((uint8_t*)"error: ", 7);
uart_write((uint8_t*)uint16_to_string(error), 4);
uart_write((uint8_t*)"\r\n", 2);
#endif
/* still in rx mode */
nrf24l01p_set_standby();
goto redo_receive;
return 0;
}
int main(void)
{
uint16_t counter;
uint8_t x;
/* setup spi first */
spi_setup_master();
spi_set_sck_freq(SPI_SCK_FREQ_FOSC2);
uart_setup();
/* setup timer1, normal mode, interrupt on match 0x8000 */
OCR1A = 0x8000;
TCCR1A = 0;
TCCR1B = 0;
TCCR1C = 0;
TIMSK1 = 1 << 1;
/* enable interrupts */
sei();
nrf24l01p_setup();
/* sparkfun usb serial board configuration */
/* NOTE: nrf24l01p_enable_crc8(); for nrf24l01p board */
/* nrf24l01p_enable_crc16(); */
nrf24l01p_disable_crc();
/* auto ack disabled */
/* auto retransmit disabled */
/* 4 bytes payload */
/* 1mbps, 0dbm */
/* nrf24l01p_set_rate(NRF24L01P_RATE_1MBPS); */
nrf24l01p_set_rate(NRF24L01P_RATE_2MBPS);
/* nrf24l01p_set_rate(NRF24L01P_RATE_250KBPS); */
/* channel 2 */
nrf24l01p_set_chan(2);
/* 5 bytes addr width */
/* nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_5); */
nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_3);
/* rx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_RX_ADDR_P0);
/* tx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_TX_ADDR);
/* enable tx no ack command */
nrf24l01p_enable_tx_noack();
nrf24l01p_powerdown_to_standby();
uart_write((uint8_t*)"tx side\r\n", 9);
redo_transmit:
counter = 0;
is_timer1_irq = 0;
uart_write((uint8_t*)"press space\r\n", 13);
uart_read_uint8(&x);
uart_write((uint8_t*)"starting\r\n", 10);
nrf24l01p_standby_to_tx();
if (nrf24l01p_is_tx_empty() == 0) nrf24l01p_flush_tx();
/* clock source disabled, safe to access 16 bits counter */
TCNT1 = 0;
/* prescaler set to 1024 */
/* interrupt every 2.01s (match on 0x8000) */
TCCR1B = 5 << 0;
while (1)
{
#define CONFIG_CHECK 0
#if CONFIG_CHECK
uint8_t i;
for (i = 0; i < NRF24L01P_PAYLOAD_WIDTH; ++i)
nrf24l01p_cmd_buf[i] = 0x2a + i;
#endif
nrf24l01p_write_tx_noack();
while (nrf24l01p_is_tx_irq() == 0) ;
++counter;
if (is_timer1_irq == 1) break ;
}
/* print counter */
uart_write((uint8_t*)"counter: ", 9);
uart_write((uint8_t*)uint16_to_string(counter), 4);
uart_write((uint8_t*)"\r\n", 2);
goto redo_transmit;
return 0;
}
int main(void)
{
uart_setup();
nrf24l01p_setup();
/* sparkfun usb serial board configuration */
/* NOTE: nrf24l01p_enable_crc8(); for nrf24l01p board */
nrf24l01p_enable_crc16();
/* auto ack disabled */
/* auto retransmit disabled */
/* 4 bytes payload */
/* 1mbps, 0dbm */
nrf24l01p_set_rate(NRF24L01P_RATE_1MBPS);
/* channel 2 */
nrf24l01p_set_chan(2);
/* 5 bytes addr width */
nrf24l01p_set_addr_width(NRF24L01P_ADDR_WIDTH_5);
/* rx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_RX_ADDR_P0);
/* tx address */
nrf24l01p_cmd_buf[0] = 0xe7;
nrf24l01p_cmd_buf[1] = 0xe7;
nrf24l01p_cmd_buf[2] = 0xe7;
nrf24l01p_cmd_buf[3] = 0xe7;
nrf24l01p_cmd_buf[4] = 0xe7;
nrf24l01p_write_reg40(NRF24L01P_REG_TX_ADDR);
/* enable tx no ack command */
nrf24l01p_enable_tx_noack();
nrf24l01p_powerdown_to_standby();
uart_write((uint8_t*)"starting\r\n", 10);
#if 1
nrf24l01p_standby_to_tx();
if (nrf24l01p_is_tx_empty() == 0) nrf24l01p_flush_tx();
nrf24l01p_cmd_buf[0] = '0';
nrf24l01p_cmd_buf[1] = '1';
nrf24l01p_cmd_buf[2] = '2';
nrf24l01p_cmd_buf[3] = '3';
nrf24l01p_write_tx_noack();
while (nrf24l01p_is_tx_irq() == 0) ;
uart_write((uint8_t*)"first\r\n", 7);
if (nrf24l01p_is_tx_empty() == 0) nrf24l01p_flush_tx();
nrf24l01p_cmd_buf[0] = 'a';
nrf24l01p_cmd_buf[1] = 'b';
nrf24l01p_cmd_buf[2] = 'c';
nrf24l01p_cmd_buf[3] = 'd';
nrf24l01p_write_tx_noack();
while (nrf24l01p_is_tx_irq() == 0) ;
uart_write((uint8_t*)"second\r\n", 8);
/* still in standby mode */
#endif
redo_receive:
nrf24l01p_standby_to_rx();
if (nrf24l01p_is_rx_full()) nrf24l01p_flush_rx();
while (nrf24l01p_is_rx_irq() == 0) ;
nrf24l01p_read_rx();
if (nrf24l01p_cmd_len == 0)
{
uart_write((uint8_t*)"ko", 2);
}
else
{
uint8_t saved_buf[4];
uint8_t i;
uart_write((uint8_t*)nrf24l01p_cmd_buf, nrf24l01p_cmd_len);
/* save before new commands */
for (i = 0; i < nrf24l01p_cmd_len; ++i)
saved_buf[i] = nrf24l01p_cmd_buf[i];
/* result in setting standby mode */
nrf24l01p_rx_to_tx();
if (nrf24l01p_is_tx_empty() == 0)
{
uart_write((uint8_t*)"\r\nNE", 4);
nrf24l01p_flush_tx();
}
/* restore saved buf */
nrf24l01p_cmd_len = i;
for (i = 0; i < nrf24l01p_cmd_len; ++i)
nrf24l01p_cmd_buf[i] = saved_buf[i];
/* push into the tx fifo, then pulse ce to send */
nrf24l01p_write_tx_noack();
while (nrf24l01p_is_tx_irq() == 0) ;
}
uart_write((uint8_t*)"\r\n", 2);
goto redo_receive;
return 0;
}
