spiClient_t *spiClientInit(SPI_TypeDef *spi, uint16_t baud, GPIO_TypeDef *csPort, uint16_t csPin, volatile uint32_t *flag, spiCallback_t *callback) {
spiClient_t *client;
client = (spiClient_t *)aqCalloc(1, sizeof(spiClient_t));
#ifdef SPI_SPI1_CLOCK
if (spi == SPI1) {
client->interface = 0;
spi1Init();
}
#endif
#ifdef SPI_SPI2_CLOCK
if (spi == SPI2) {
client->interface = 1;
spi2Init();
}
#endif
#ifdef SPI_SPI3_CLOCK
if (spi == SPI3) {
client->interface = 2;
spi3Init();
}
#endif
client->cs = digitalInit(csPort, csPin, 1);
spiDeselect(client);
spiChangeBaud(client, baud);
client->flag = flag;
client->callback = callback;
return client;
}
static inline bool cdeselect(void)
{
spiDeselect();
// spi_disable();
nRF905_interrupt_on();
return false;
}
void spi_transfer(uint8_t *buf, uint16_t len, uint8_t toggle_cs)
{
spiSelect (SS_PB2);
spiMultiByteTransfer(buf, len);
if (toggle_cs)
spiDeselect (SS_PB2);
return;
}
static void spiStartTxn(spiStruct_t *interface) {
spiSlot_t *slot = &interface->slots[interface->tail];
spiClient_t *client = slot->client;
uint32_t tmp;
// is the current txn taking too long?
if (interface->txRunning != 0 && (timerMicros() - interface->txnStart) > SPI_MAX_TXN_TIME) {
spiDisableDMA(interface);
spiDisableSPI(interface);
spiDeselect(client);
interface->tail = (interface->tail + 1) % SPI_SLOTS;
slot = &interface->slots[interface->tail];
client = slot->client;
interface->txRunning = 0;
interface->txnTimeouts++;
}
if (interface->tail != interface->head && interface->txRunning == 0) {
interface->txRunning = 1;
interface->txnStart = timerMicros();
// set baud rate
tmp = interface->spi->CR1 & SPI_BAUD_MASK;
tmp |= client->baud;
interface->spi->CR1 = tmp;
// clear DR
SPI_I2S_ReceiveData(interface->spi);
spiSelect(client);
// specify "in transaction"
if (client->flag)
*client->flag = 0;
interface->rxDMAStream->M0AR = slot->rxBuf;
interface->rxDMAStream->NDTR = slot->size;
DMA_Cmd(interface->rxDMAStream, ENABLE);
interface->txDMAStream->M0AR = slot->txBuf;
interface->txDMAStream->NDTR = slot->size;
DMA_Cmd(interface->txDMAStream, ENABLE);
SPI_Cmd(interface->spi, ENABLE);
}
}
static void spiEndTxn(spiStruct_t *interface) {
uint8_t tail = interface->tail;
spiClient_t *client = interface->slots[tail].client;
uint32_t tmp;
spiDisableSPI(interface);
spiDisableDMA(interface);
spiDeselect(client);
// record longest txn
tmp = timerMicros() - interface->txnStart;
if (tmp > interface->txnMaxTime)
interface->txnMaxTime = tmp;
spiNotify(client);
tail = (tail + 1) % SPI_SLOTS;
interface->tail = tail;
interface->txRunning = 0;
spiTriggerSchedule(client->interface);
}
void nRF905_init()
{
#ifdef ARDUINO
pinMode(TRX_EN, OUTPUT);
pinMode(PWR_MODE, OUTPUT);
pinMode(TX_EN, OUTPUT);
#if NRF905_COLLISION_AVOID
pinMode(CD, INPUT);
#endif
#if AM_IS_USED_HW
pinMode(AM, INPUT);
#endif
#if !NRF905_DR_SW
pinMode(DR, INPUT);
#endif
digitalWrite(CSN, HIGH);
pinMode(CSN, OUTPUT);
SPI.begin();
SPI.setClockDivider(SPI_CLOCK_DIV2);
#else
TRX_EN_DDR |= _BV(TRX_EN_BIT);
PWR_MODE_DDR |= _BV(PWR_MODE_BIT);
TX_EN_DDR |= _BV(TX_EN_BIT);
#if NRF905_COLLISION_AVOID
CD_DDR &= ~_BV(CD_BIT);
#endif
#if AM_IS_USED_HW
AM_DDR &= ~_BV(AM_BIT);
#endif
#if !NRF905_DR_SW
DR_DDR &= ~_BV(DR_BIT);
#endif
spiDeselect();
CSN_DDR |= _BV(CSN_BIT);
spi_init();
#endif
radio.state = NRF905_RADIO_STATE_IDLE;
// Startup
enableStandbyMode();
receiveMode();
nRF905_powerDown();
_delay_ms(3);
defaultConfig();
#if NRF905_INTERRUPTS
// Set interrupts
REG_EXTERNAL_INT_CTL |= BIT_EXTERNAL_INT_CTL;
nRF905_interrupt_on();
#endif
nRF905_powerUp();
}
