void SPI::beginTransaction(SPISettings settings) {
pthread_mutex_lock (&spiMutex);
setBitOrder(settings.border);
setDataMode(settings.dmode);
setClockDivider(settings.clck);
}
void _CoreSPI::begin() {
// Set the SPI0 pins to the Alt 0 function to enable SPI0 access on them
// GPIO.selectFunction(CS0, FSEL_ALT0);
// GPIO.selectFunction(CS1, FSEL_ALT0);
GPIO.selectFunction(MISO, FSEL_ALT0);
GPIO.selectFunction(MOSI, FSEL_ALT0);
GPIO.selectFunction(SCK, FSEL_ALT0);
map_peripheral(&spi);
reg = (bcm2835_spi_registers *)spi.map;
reg->cs_val = 0;
sync_peripheral(&spi);
reg->cs.clear = 0b11;
reg->cs.cs = 0b11;
sync_peripheral(&spi);
setClockDivider(SPI_CLOCK_DIV256);
// setChipSelectPolarity(SPI_CS0, LOW);
// setChipSelectPolarity(SPI_CS1, LOW);
// setChipSelectPolarity(SPI_CS2, LOW);
// chipSelect(SPI_CS0);
started = true;
}
BroadcomI2C::Result BroadcomI2C::initialize()
{
// Map I2C registers
if (m_io.map(IO_BASE + BSC1, PAGESIZE,
Memory::User|Memory::Readable|Memory::Writable|Memory::Device) != IO::Success)
return IOError;
// Initialize GPIO controller
if (m_gpio.initialize() != BroadcomGPIO::Success)
return IOError;
// Set GPIO pins to ALT0 function for SDA, SCL pins
m_gpio.setAltFunction(2, BroadcomGPIO::Function0);
m_gpio.setAltFunction(3, BroadcomGPIO::Function0);
// Detect I2C controller. In Qemu, the ClockDivider is always zero.
if (m_io.read(ClockDivider) == 0)
{
return NotFound;
}
// Set a slow clock to attempt workaround the I2C bug in Broadcom 2835
setClockDivider(0x5dc * 3);
DEBUG("I2C GPIO pins set");
DEBUG("ClockDivider is " << m_io.read(ClockDivider));
DEBUG("Status is " << m_io.read(Status));
// Done
return Success;
}
void SPIClass::begin()
{
if (!initialized) {
void *pciDev = NULL;
// Get SPI device base address
pciDev = pci_Alloc(0x00, 0x10, 0x01); // PCI SPI configuration space
if(pciDev == NULL) {printf("SPI device don't exist\n"); return;}
SPI_IOaddr = (unsigned)(pci_In16(pciDev, 0x10) & 0xFFFFFFF0L); // get SPI base address
#if defined DEBUG_MODE
printf("SPI base address = %04X\n", SPI_IOaddr);
#endif
pci_Free(pciDev);
WriteCTRR(FULLDUPEX + SPI_MODE0 + RESET);
io_outpb(SPI_IOaddr + 7, FULLDUPEX); // full-dupex
io_outpb(SPI_IOaddr + 7, io_inpb(SPI_IOaddr + 7) & 0xF1 | SPI_MODE0); // set mode
io_outpb(SPI_IOaddr + 0x0b, 0x08); // delay clk between two transfers
//SOURCE clock/(2 * SPI_CLOCK_DIV)
setClockDivider(13); // 100/(2*13) ~= 4MHz
useFIFO();
detachInterrupt();
io_outpb(SPI_IOaddr + 4, 0x01); // set CS = high
// Set SS to high so a connected chip will be "deselected" by default
pinMode(SS, OUTPUT);
digitalWrite(SS, HIGH);
}
initialized++; // reference count
}
void SPIClass::begin()
{
init();
// NPCS control is left to the user
// Default speed set to 4Mhz
setClockDivider(BOARD_SPI_DEFAULT_SS, 21);
setDataMode(BOARD_SPI_DEFAULT_SS, SPI_MODE0);
setBitOrder(BOARD_SPI_DEFAULT_SS, MSBFIRST);
}
void SPIClass::begin() {
initCb();
SPI_Configure(spi, id, SPI_MR_MSTR | SPI_MR_PS | SPI_MR_MODFDIS);
SPI_Enable(spi);
// NPCS control is left to the user
// Default speed set to 4Mhz
setClockDivider(BOARD_SPI_DEFAULT_SS, 21);
setDataMode(BOARD_SPI_DEFAULT_SS, SPI_MODE0);
setBitOrder(BOARD_SPI_DEFAULT_SS, MSBFIRST);
}
SSP1::SSP1() //define constructor
{
this->port = LPCXSSP1;
bitOrder = LSBFIRST;
divider = SPI_CLOCK_DIV4; //Arduino's default
dataMode = SPI_MODE0;
bitlength = 8;
setClockDivider(divider);
setBitLength(bitlength);
setBitOrder(LSBFIRST);
begin();
}
void WIFI_SPIClass::begin() {
void *pciDev = NULL;
if(io_Init() == false)
return;
// Get SPI device base address
pciDev = pci_Alloc(0x00, 0x10, 0x01); // PCI SPI configuration space
if(pciDev == NULL) {printf("WiFi-SPI device don't exist\n"); return;}
WIFI_SPI_IOaddr = (unsigned)(pci_In16(pciDev, 0x10) & 0xFFFFFFF0L); // get SPI base address
#if defined WIFI_DEBUG_MODE
printf("WiFi-SPI base address = %04X\n", WIFI_SPI_IOaddr);
#endif
pci_Free(pciDev);
WIFI_WriteCTRR(WIFI_FULLDUPEX + WIFI_SPI_MODE0 + WIFI_RESET);
io_outpb(WIFI_SPI_IOaddr + 7, WIFI_FULLDUPEX); // full-dupex
io_outpb(WIFI_SPI_IOaddr + 7, io_inpb(WIFI_SPI_IOaddr + 7) & 0xF1 | WIFI_SPI_MODE0); // set mode
io_outpb(WIFI_SPI_IOaddr + 0x0b, 0x08); // delay clk between two transfers
//SOURCE clock/(2 * SPI_CLOCK_DIV)
setClockDivider(WIFI_SPI_CLOCK_DIV800); // 125k Hz
WIFI_useFIFO();
detachInterrupt();
io_outpb(WIFI_SPI_IOaddr + 4, 0x01); // set CS = high
// Set SS to high so a connected chip will be "deselected" by default
digitalWrite(SS, HIGH);
// When the SS pin is set as OUTPUT, it can be used as
// a general purpose output port (it doesn't influence
// SPI operations).
//pinMode(SS, OUTPUT);
// Warning: if the SS pin ever becomes a LOW INPUT then SPI
// automatically switches to Slave, so the data direction of
// the SS pin MUST be kept as OUTPUT.
//SPCR |= _BV(MSTR);
//SPCR |= _BV(SPE);
// Set direction register for SCK and MOSI pin.
// MISO pin automatically overrides to INPUT.
// By doing this AFTER enabling SPI, we avoid accidentally
// clocking in a single bit since the lines go directly
// from "input" to SPI control.
// http://code.google.com/p/arduino/issues/detail?id=888
//pinMode(SCK, OUTPUT);
//pinMode(MOSI, OUTPUT);
}
void SPIClass::begin(uint8_t _pin)
{
init();
uint32_t spiPin = BOARD_PIN_TO_SPI_PIN(_pin);
PIO_Configure(
g_APinDescription[spiPin].pPort,
g_APinDescription[spiPin].ulPinType,
g_APinDescription[spiPin].ulPin,
g_APinDescription[spiPin].ulPinConfiguration);
// Default speed set to 4Mhz
setClockDivider(_pin, 21);
setDataMode(_pin, SPI_MODE0);
setBitOrder(_pin, MSBFIRST);
}
void SPIClass::begin(uint16_t divider, uint8_t bitOrder, uint8_t dataMode)
{
setClockDivider(divider);
setBitOrder(bitOrder);
setDataMode(dataMode);
//Set CS pins polarity to low
bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, 0);
bcm2835_spi_begin();
//Initialize a timestamp for millis calculation
gettimeofday(&RHStartTime, NULL);
}
void SPIClass::setClock(uint32_t rate){
setClockDivider(SPI0F2DIV(rate));
}