void set_address(char *address, int address_size) {
spi_csl();
spi_send(NRF_WRITE | NRF_TX_ADDR);
spi_send_buffer(address, address_size);
spi_csh();
spi_csl();
spi_send(NRF_WRITE | NRF_RX_ADDR_P0);
spi_send_buffer(address, address_size);
spi_csh();
}
/*
* SPI.c
*
* Created on: Nov 22, 2012
* Author: Admin
*/
void SPI_Init(void)
{
/**
* From TIs users manual
*
* The recommended USCI initialization/re-configuration process is:
* 1. Set UCSWRST (BIS.B #UCSWRST,&UCxCTL1)
* 2. Initialize all USCI registers with UCSWRST=1 (including UCxCTL1)
* 3. Configure ports
* 4. Clear UCSWRST via software (BIC.B #UCSWRST,&UCxCTL1)
* 5. Enable interrupts (optional) via UCxRXIE and/or UCxTXIE
*/
// (1)
UCB0CTL1 = UCSWRST;
// (2)
P1DIR |= CE;
P1DIR |= CSN;
P1OUT |= CSN;
P1SEL |= SOMI + SIMO + SCLK;
P1SEL2 |= SOMI + SIMO + SCLK;
// (3) 3-pin, 8-bit SPI master
UCB0CTL0 |= UCCKPH + UCMSB + UCMST + UCSYNC;
UCB0CTL1 |= UCSSEL_2; // SMCLK
// (4)
UCB0CTL1 &= ~UCSWRST;
spi_csh();
}
char nrf_rx() {
char tmp;
spi_csl();
spi_send(NRF_R_PAYLOAD);
tmp = spi_send(NRF_NOOP);
spi_csh();
return tmp;
}
char nrf_read( char address ) {
char tmp;
spi_csl();
spi_send(NRF_READ | address);
tmp = spi_send(NRF_NOOP);
spi_csh();
return tmp;
}
/*
* SPI.c
*
* Created on: Nov 22, 2012
* Author: Admin
*/
void SPI_Init_For_RF(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Init CSN pin */
GPIO_InitStructure.GPIO_Pin = CSN_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(CSN_PORT, &GPIO_InitStructure);
/* Init CE pin */
GPIO_InitStructure.GPIO_Pin = CE_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(CE_PORT, &GPIO_InitStructure);
/* Init IRQ pin */
GPIO_InitStructure.GPIO_Pin = IRQ_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(IRQ_PORT, &GPIO_InitStructure);
/* Enable SPI1 clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = SCLK_PIN | MISO_PIN | MOSI_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(SCLK_PORT, &GPIO_InitStructure);
/* SPI1 configuration */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1 */
SPI_Cmd(SPI1, ENABLE);
spi_csh();
}
void nrf_tx(char data) {
char tmp = nrf_read(NRF_FIFO_STATUS);
if(tmp & NRF_STAT_TX_FULL) {
return;
}
radio_on();
spi_csl();
spi_send(NRF_TX);
spi_send(data);
spi_csh();
nrf_ceh();
//start transmission (pulse CE > 10us)
__delay_cycles(20);
nrf_cel();
__delay_cycles(1000);
radio_off();
}
void draw_square()
{
int count = 0;
if(change_duty) {
square_wave_init();
change_duty = 0;
}
while(count < NUM_DIVISIONS) {
if (timeCount > oldTimeCount) {
oldTimeCount = timeCount;
spi_csl();
spi_xfer_byte((squareVals[count] | 0x1000) >> 8);
spi_xfer_byte(squareVals[count++] & 0xFF);
spi_csh();
}
}
void send_command(char command) {
spi_csl();
spi_send(command);
spi_csh();
}
void nrf_write(char address, char data) {
spi_csl();
spi_send(NRF_WRITE | address);
spi_send(data);
spi_csh();
}
