I'm trying to establish a connection with an ICM-20948 via SPI. I check the pins and they are correct but the RX buffer always returns 0x00 when I call to "whoami".
The GPIO and SPI config:
nrfx_spim_config_t spim_config = {
.sck_pin = APP_SPIM_SCK_PIN,
.mosi_pin = APP_SPIM_MOSI_PIN,
.miso_pin = APP_SPIM_MISO_PIN,
.ss_pin = APP_SPIM_CS_PIN,
.ss_active_high = false,
.irq_priority = NRFX_SPIM_DEFAULT_CONFIG_IRQ_PRIORITY,
.orc = 0xFF,
.frequency = NRF_SPIM_FREQ_4M,
.mode = NRF_SPIM_MODE_0,
.bit_order = NRF_SPIM_BIT_ORDER_MSB_FIRST,
.miso_pull = NRF_GPIO_PIN_NOPULL,
.dcx_pin = NRFX_SPIM_PIN_NOT_USED,
.rx_delay = 0x02,
.use_hw_ss = false,
.ss_duration = 0x02,
};
nrfx_spim_init(&spim, &spim_config, spim_event_handler, NULL);
gpio_pin_configure(GPIO0_PORT, APP_SPIM_CS_PIN, GPIO_OUTPUT | GPIO_OUTPUT_INIT_LOW); The comm code:
gpio_pin_set(GPIO0_PORT, APP_SPIM_CS_PIN, true);
m_tx_buf[0] = ((REG_WHO_AM_I & 0x7F) | 0x80);
nrfx_spim_xfer(&spim, &xfer_desc, 0);
waitData = true;
while(waitData) {
__WFE();
}
for(int32_t i = 0; i < len; i++)
{
printk("%i ", xfer_desc.p_rx_buffer[i]);
}
gpio_pin_set(GPIO0_PORT, APP_SPIM_CS_PIN, false);
My SPI0 devicetree:
spi0: spi@8000 {
compatible = "nordic,nrf-spim";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x8000 0x1000>;
interrupts = <8 NRF_DEFAULT_IRQ_PRIORITY>;
max-frequency = <DT_FREQ_M(8)>;
status = "okay";
cs-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
pinctrl-0 = <&spi0_default>;
pinctrl-names = "default";
};
spi0_default: spi0_default {
group1 {
psels = <NRF_PSEL(SPIM_SCK, 0, 18)>,
<NRF_PSEL(SPIM_MISO, 0, 26)>,
<NRF_PSEL(SPIM_MOSI, 0, 17)>;
};
};
Did I forget something to config?
