Spi(int bus, int cs)
{
m_spi = mraa_spi_init_raw(bus, cs);
if (m_spi == NULL) {
throw std::invalid_argument("Error initialising SPI bus");
}
}
mraa_spi_context
mraa_spi_init(int bus)
{
if (plat == NULL) {
syslog(LOG_ERR, "spi: Platform Not Initialised");
return NULL;
}
if (mraa_is_sub_platform_id(bus)) {
syslog(LOG_ERR, "spi: Spi module doesn't support subplatforms");
return NULL;
}
if (plat->spi_bus_count == 0) {
syslog(LOG_ERR, "spi: no spi buses defined in platform");
return NULL;
}
if (plat->spi_bus_count == 1) {
bus = plat->def_spi_bus;
}
if (bus >= plat->spi_bus_count) {
syslog(LOG_ERR, "spi: requested bus above spi bus count");
return NULL;
}
if (plat->adv_func->spi_init_pre != NULL) {
if (plat->adv_func->spi_init_pre(bus) != MRAA_SUCCESS) {
return NULL;
}
}
int pos = plat->spi_bus[bus].sclk;
if (plat->pins[pos].spi.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos].spi) != MRAA_SUCCESS) {
syslog(LOG_ERR, "spi: failed to set-up spi sclk multiplexer");
return NULL;
}
}
pos = plat->spi_bus[bus].mosi;
if (plat->pins[pos].spi.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos].spi) != MRAA_SUCCESS) {
syslog(LOG_ERR, "spi: failed to set-up spi mosi multiplexer");
return NULL;
}
}
pos = plat->spi_bus[bus].miso;
if (plat->pins[pos].spi.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos].spi) != MRAA_SUCCESS) {
syslog(LOG_ERR, "spi: failed to set-up spi miso multiplexer");
return NULL;
}
}
pos = plat->spi_bus[bus].cs;
if (plat->pins[pos].spi.mux_total > 0) {
if (mraa_setup_mux_mapped(plat->pins[pos].spi) != MRAA_SUCCESS) {
syslog(LOG_ERR, "spi: failed to set-up spi cs multiplexer");
return NULL;
}
}
mraa_spi_context dev = mraa_spi_init_raw(plat->spi_bus[bus].bus_id, plat->spi_bus[bus].slave_s);
if (plat->adv_func->spi_init_post != NULL) {
mraa_result_t ret = plat->adv_func->spi_init_post(dev);
if (ret != MRAA_SUCCESS) {
free(dev);
return NULL;
}
}
return dev;
}
