/*
* Apply device specific configuration of SPI controller
*/
static void ad_spi_bus_apply_config(spi_device_config *device)
{
const HW_SPI_ID id = ad_spi_get_hw_spi_id(device);
current_config[id == HW_SPI1 ? 0 : 1] = device;
device->bus_data->current_device = device;
hw_spi_init(id, &device->hw_init);
}
// Constructor for hardware SPI -- must connect to MOSI, SCK pins
Adafruit_DotStar::Adafruit_DotStar(uint16_t n, uint8_t o) :
numLEDs(n), dataPin(USE_HW_SPI), brightness(0), pixels(NULL),
rOffset(o & 3), gOffset((o >> 2) & 3), bOffset((o >> 4) & 3)
{
updateLength(n);
}
// Constructor for 'soft' (bitbang) SPI -- any two pins can be used
Adafruit_DotStar::Adafruit_DotStar(uint16_t n, uint8_t data, uint8_t clock,
uint8_t o) :
dataPin(data), clockPin(clock), brightness(0), pixels(NULL),
rOffset(o & 3), gOffset((o >> 2) & 3), bOffset((o >> 4) & 3)
{
updateLength(n);
}
Adafruit_DotStar::~Adafruit_DotStar(void) { // Destructor
if(pixels) free(pixels);
if(dataPin == USE_HW_SPI) hw_spi_end();
else sw_spi_end();
}
void Adafruit_DotStar::begin(void) { // Initialize SPI
if(dataPin == USE_HW_SPI) hw_spi_init();
else sw_spi_init();
}
// Pins may be reassigned post-begin(), so a sketch can store hardware
// config in flash, SD card, etc. rather than hardcoded. Also permits
// "recycling" LED ram across multiple strips: set pins to first strip,
// render & write all data, reassign pins to next strip, render & write,
// etc. They won't update simultaneously, but usually unnoticeable.
// Change to hardware SPI -- must connect to MOSI, SCK pins
void Adafruit_DotStar::updatePins(void) {
sw_spi_end();
dataPin = USE_HW_SPI;
hw_spi_init();
}
void hw_init(void)
{
gpio_rs_fd = sysfs_gpio_open("out", GPIO_RS_PIN);
if(gpio_rs_fd < 0) {
fprintf(stderr, "Error: hw_gpio_init(GPIO_RS_PIN)\n");
exit(1);
}
spi_fd = hw_spi_init();
if(spi_fd < 0) {
fprintf(stderr, "Error: hw_spi_init()\n");
exit(1);
}
}
static void bus_spi_open(void)
{
hw_spi_init();
}
