int main(void)
{
//! [main_setup]
//! [system_init]
system_init();
//! [system_init]
//! [run_config]
configure_spi_master();
//! [run_config]
//! [main_setup]
//! [main_use_case]
//! [inf_loop]
while (true) {
/* Infinite loop */
if(!port_pin_get_input_level(BUTTON_0_PIN)) {
//! [select_slave]
spi_select_slave(&spi_master_instance, &slave, true);
//! [select_slave]
//! [write]
spi_write_buffer_wait(&spi_master_instance, buffer, BUF_LENGTH);
//! [write]
//! [deselect_slave]
spi_select_slave(&spi_master_instance, &slave, false);
//! [deselect_slave]
//! [light_up]
port_pin_set_output_level(LED_0_PIN, LED0_ACTIVE);
//! [light_up]
}
}
//! [inf_loop]
//! [main_use_case]
}
/**
* \brief Write a register value.
*
* \param reg the register address to modify.
* \param wrdata the new register value.
*/
void ksz8851_reg_write(uint16_t reg, uint16_t wrdata)
{
uint8_t inbuf[4];
uint8_t outbuf[4];
uint16_t cmd = 0;
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, true);
/* Move register address to cmd bits 9-2, make 32-bit address. */
cmd = (reg << 2) & REG_ADDR_MASK;
/* Last 2 bits still under "don't care bits" handled with byte enable. */
/* Select byte enable for command. */
if (reg & 2) {
/* Odd word address writes bytes 2 and 3 */
cmd |= (0xc << 10);
} else {
/* Even word address write bytes 0 and 1 */
cmd |= (0x3 << 10);
}
/* Add command write code. */
cmd |= CMD_WRITE;
outbuf[0] = cmd >> 8;
outbuf[1] = cmd & 0xff;
outbuf[2] = wrdata & 0xff;
outbuf[3] = wrdata >> 8;
/* Perform SPI transfer. */
spi_transceive_buffer_wait(&ksz8851snl_master, outbuf, inbuf, 4);
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, false);
}
/*!
* @brief Receives data from BMM050 on SPI
*
* @param[in] dev_addr Device I2C slave address (not used)
*
* @param[in] reg_addr Address of destination register
*
* @param[out] reg_data Pointer to data buffer to be received
*
* @param[in] length Length of the data to be received
*
* @retval 0 BMG160_SUCCESS
* @retval -1 BMG160_ERROR
*
*/
int8_t bmg_spi_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *rx_data, uint8_t length)
{
enum status_code bmg_read_stat = STATUS_NO_CHANGE;
/* This variable is used to avoid infinite loops. */
uint16_t loop_count;
uint16_t dummy = 0;
reg_addr = reg_addr | 0x80;
spi_select_slave(&spi_master_instance, &bmg160_spi_slave, true);
loop_count = 0;
do
{
bmg_read_stat = spi_write_buffer_wait(&spi_master_instance, ®_addr, 1);
loop_count++;
}while(bmg_read_stat != STATUS_OK && loop_count < 100);
loop_count = 0;
do
{
bmg_read_stat = spi_read_buffer_wait(&spi_master_instance, rx_data, length, dummy);
loop_count++;
}while(bmg_read_stat != STATUS_OK && loop_count < 100);
spi_select_slave(&spi_master_instance, &bmg160_spi_slave, false);
if (bmg_read_stat != STATUS_OK)
{
return -1;
}
return 0;
}
/**
* \internal
* \brief Test sending and receiving 9-bit data by polling.
*
* This test sends (writes) one 9-bit data to the slave and
* receives (reads) the data back and compares.
*
* Writing and reading are carried out by polling.
*
* \param test Current test case.
*/
static void run_transfer_9bit_test(const struct test_case *test)
{
uint16_t txd_data = 0x155;
uint16_t rxd_data = 0;
/* Skip test if initialization failed */
test_assert_true(test, spi_init_success,
"Skipping test due to failed initialization");
/* Send data to slave */
spi_select_slave(&master, &slave_inst, true);
while (!spi_is_ready_to_write(&master)) {
}
spi_write(&master, txd_data);
while (!spi_is_write_complete(&master)) {
}
/* Dummy read SPI master data register */
while (!spi_is_ready_to_read(&master)) {
}
spi_read(&master, &rxd_data);
/* Read SPI slave data register */
while (!spi_is_ready_to_read(&slave)) {
}
spi_read(&slave, &rxd_data);
spi_select_slave(&master, &slave_inst, false);
/* Output test result */
test_assert_true(test, rxd_data == txd_data,
"Failed transmitting/receiving byte. TX='%d', RX='%d'",
txd_data, rxd_data);
}
/**
* \brief Writes a command to the display controller
*
* This functions pull pin D/C# low before writing to the controller. Different
* data write function is called based on the selected interface.
*
* \param command the command to write
*/
void ssd1306_write_command(uint8_t command)
{
spi_select_slave(&ssd1306_master, &ssd1306_slave, true);
port_pin_set_output_level(SSD1306_DC_PIN, false);
spi_write_buffer_wait(&ssd1306_master, &command, 1);
spi_select_slave(&ssd1306_master, &ssd1306_slave, false);
}
/**
* \internal
* \brief Test: Send & receive data using transceive functions.
*
* This test sends (writes) an array of data to the slave and
* receives (reads) the buffer back using transceive functions
* and compares.
*
* \param test Current test case.
*/
static void run_transceive_buffer_test(const struct test_case *test)
{
enum status_code status = STATUS_ERR_IO;
/* Skip test if initialization failed */
test_assert_true(test, spi_init_success,
"Skipping test due to failed initialization");
/* Start the test */
spi_transceive_buffer_job(&slave, slave_tx_buf, slave_rx_buf,
BUFFER_LENGTH);
spi_select_slave(&master, &slave_inst, true);
status = spi_transceive_buffer_wait(&master, tx_buf, rx_buf,
BUFFER_LENGTH);
spi_select_slave(&master, &slave_inst, false);
test_assert_true(test, status == STATUS_OK,
"Transceive buffer failed");
/* Compare received data with transmitted data */
if (status == STATUS_OK) {
for (uint16_t i = 0; i < BUFFER_LENGTH; i++) {
test_assert_true(test, tx_buf[i] == slave_rx_buf[i],
"During TX: Bytes differ at buffer index %d : %d != %d",
i, tx_buf[i], slave_rx_buf[i]);
test_assert_true(test, slave_tx_buf[i] == rx_buf[i],
"During RX: Bytes differ at buffer index %d : %d != %d",
i, slave_tx_buf[i], rx_buf[i]);
}
}
}
int main(void)
{
//! [main_setup]
//! [system_init]
system_init();
//! [system_init]
//! [run_config]
configure_spi_master();
//! [run_config]
//! [main_setup]
//! [main_use_case]
//! [select_slave]
spi_select_slave(&spi_master_instance, &slave, true);
//! [select_slave]
//! [write]
spi_write_buffer_wait(&spi_master_instance, buffer, BUF_LENGTH);
//! [write]
//! [deselect_slave]
spi_select_slave(&spi_master_instance, &slave, false);
//! [deselect_slave]
//! [inf_loop]
while (true) {
/* Infinite loop */
}
//! [inf_loop]
//! [main_use_case]
}
/**
* \brief Write data to the display controller
*
* This functions sets the pin D/C# before writing to the controller. Different
* data write function is called based on the selected interface.
*
* \param data the data to write
*/
void ssd1306_write_data(uint8_t data)
{
spi_select_slave(&ssd1306_master, &ssd1306_slave, true);
port_pin_set_output_level(SSD1306_DC_PIN, true);
spi_write_buffer_wait(&ssd1306_master, &data, 1);
spi_select_slave(&ssd1306_master, &ssd1306_slave, false);
}
void rom_erase() {
rom_write_enable();
while(rom_status() & 0x1);
spi_select_slave(SPI_SLAVE_ROM);
spi_send_recv(ROM_COMMAND_ERASE_CHIP);
spi_select_slave(SPI_SLAVE_NONE);
}
void test_spi_select_slave(void) {
delay_ms(1);
spi_select_slave(SPI0, SPI_SELECTOR_0);
TEST_ASSERT_TRUE((SPI0->SPI_MR & SPI_MR_PCS_MASK) >> 16 == 0b0000);
spi_select_slave(SPI0, SPI_SELECTOR_1);
TEST_ASSERT_TRUE((SPI0->SPI_MR & SPI_MR_PCS_MASK) >> 16 == 0b0001);
spi_select_slave(SPI0, SPI_SELECTOR_2);
TEST_ASSERT_TRUE((SPI0->SPI_MR & SPI_MR_PCS_MASK) >> 16 == 0b0011);
}
int main (void)
{
system_init();
while ( !system_clock_source_is_ready(SYSTEM_CLOCK_SOURCE_DPLL) ) {
}
// Disable the pin select for the CAN Controller
fnc_can_controller_disable();
// Perform the SERCOM configuration for this board
bastian_complete_sercom_setup();
// TCC Configuration
tcc_configure_function(); // Counter Configuration
tcc_callback_configuration(); // Timer Callback Configuration
// Select Slave
spi_select_slave(&spi_master, &spi_shield, false);
// Wait the necessary time for the chip to restart
inProgress = true;
intProgressTimer = 100; // wait for 11ms
while ( inProgress ) { }
// Read the status from the on-board CAN controller
spi_select_slave(&spi_master, &spi_CAN_controller, true);
spi_write_buffer_wait(&spi_master, wr_can_buffer_startup, SYSTEM_SLAVE_TX_SINGLE_BYTE);
spi_select_slave(&spi_master, &spi_CAN_controller, false);
// Wait the necessary time for the chip to restart
inProgress = true;
intProgressTimer = 50; // wait for 11ms
while ( inProgress ) { }
spi_select_slave(&spi_master, &spi_CAN_controller, true);
spi_transceive_buffer_job(&spi_master, &wr_can_buffer_startup[1], rd_buffer, SYSTEM_SLAVE_STATUS_TRANSACTION_LENGTH);
//spi_select_slave(&spi_master, &spi_CAN_controller, false);
// inProgress = true;
// intProgressTimer = 10; // wait for 2ms
// while ( inProgress ) { }
//
// spi_select_slave(&spi_master, &spi_CAN_controller, true);
// spi_transceive_buffer_job(&spi_master, wr_can_buffer, rd_buffer, SYSTEM_SLAVE_STATUS_TRANSACTION_LENGTH);
// Main Loop
while (1) {
}
}
uint8_t rom_status() {
uint8_t status;
spi_select_slave(SPI_SLAVE_ROM);
spi_send_recv(ROM_COMMAND_READ_STATUS);
status = spi_send_recv(0xFF);
spi_select_slave(SPI_SLAVE_NONE);
return status;
}
void rom_read(uint32_t address, uint8_t *buffer, uint32_t size) {
while(rom_status() & 0x1);
spi_select_slave(SPI_SLAVE_ROM);
spi_send_recv(ROM_COMMAND_READ_DATA);
spi_send_recv((address >> 16) & 0xFF);
spi_send_recv((address >> 8) & 0xFF);
spi_send_recv(address & 0xFF);
while(size--)
*buffer++ = spi_send_recv(0xFF);
spi_select_slave(SPI_SLAVE_NONE);
}
enum ab1815_status ab1815_write(struct ab1815_t *clock, uint8_t offset, uint8_t *buf, uint8_t length)
{
uint8_t buffer[length + 1];
enum ab1815_status ret_code = ab1815_status_ERROR;
buffer[0] = AB1815_SPI_WRITE(offset);
memcpy(buffer + 1, buf, length);
spi_select_slave(clock->spi_bus, clock->slave, true);
if(spi_write_buffer_wait(clock->spi_bus, buffer, length + 1) == STATUS_OK)
{
ret_code = ab1815_status_OK;
}
spi_select_slave(clock->spi_bus, clock->slave, false);
return ret_code;
};
static sint8 spi_rw(uint8* pu8Mosi, uint8* pu8Miso, uint16 u16Sz)
{
uint8 u8Dummy = 0;
uint8 u8SkipMosi = 0, u8SkipMiso = 0;
uint16_t txd_data = 0;
uint16_t rxd_data = 0;
if (!pu8Mosi) {
pu8Mosi = &u8Dummy;
u8SkipMosi = 1;
}
else if(!pu8Miso) {
pu8Miso = &u8Dummy;
u8SkipMiso = 1;
}
else {
return M2M_ERR_BUS_FAIL;
}
spi_select_slave(&master, &slave_inst, true);
while (u16Sz) {
txd_data = *pu8Mosi;
while (!spi_is_ready_to_write(&master))
;
while(spi_write(&master, txd_data) != STATUS_OK)
;
/* Read SPI master data register. */
while (!spi_is_ready_to_read(&master))
;
while (spi_read(&master, &rxd_data) != STATUS_OK)
;
*pu8Miso = rxd_data;
u16Sz--;
if (!u8SkipMiso)
pu8Miso++;
if (!u8SkipMosi)
pu8Mosi++;
}
while (!spi_is_write_complete(&master))
;
spi_select_slave(&master, &slave_inst, false);
return M2M_SUCCESS;
}
enum ab1815_status ab1815_read(struct ab1815_t *clock, uint8_t offset, uint8_t *buf, uint8_t length)
{
uint8_t address = AB1815_SPI_READ(offset);
enum ab1815_status ret_code = ab1815_status_ERROR;
spi_select_slave(clock->spi_bus, clock->slave, true);
if(spi_write_buffer_wait(clock->spi_bus, &address, 1) == STATUS_OK)
{
if(spi_read_buffer_wait(clock->spi_bus, buf, length, SPI_DUMMY) == STATUS_OK)
{
ret_code = ab1815_status_OK;
}
}
spi_select_slave(clock->spi_bus, clock->slave, false);
return ret_code;
};
/**
* \internal
* \brief Test: Sends data at different baud rates.
*
* This test sends (writes) a byte to the slave and receives the data
* at different baudrate testing up to the maximum allowed level.
*
* Transmission and reception are carried out by polling.
*
* \param test Current test case.
*/
static void run_baud_test(const struct test_case *test)
{
uint32_t test_baud = 1000000;
uint8_t txd_data = 0x55;
uint8_t rxd_data = 0;
bool max_baud = true;
/* Skip test if initialization failed */
test_assert_true(test, spi_init_success,
"Skipping test due to failed initialization");
/* Structure for SPI configuration */
struct spi_config config;
/* Configure the SPI master */
spi_get_config_defaults(&config);
config.mux_setting = CONF_SPI_MASTER_SPI_MUX;
config.pinmux_pad0 = CONF_SPI_MASTER_DATA_IN_PIN_MUX;
config.pinmux_pad1 = PINMUX_UNUSED;
config.pinmux_pad2 = CONF_SPI_MASTER_DATA_OUT_PIN_MUX;
config.pinmux_pad3 = CONF_SPI_MASTER_SCK_PIN_MUX;
do {
spi_disable(&master);
config.mode_specific.master.baudrate = test_baud;
spi_init(&master, CONF_SPI_MASTER_MODULE, &config);
spi_enable(&master);
/* Send data to slave */
spi_select_slave(&master, &slave_inst, true);
spi_write_buffer_wait(&master, &txd_data, 1);
spi_read_buffer_wait(&slave, &rxd_data, 1, 0);
spi_select_slave(&master, &slave_inst, false);
if (txd_data != rxd_data) {
max_baud = false;
break;
}
test_baud += 1000000;
} while (test_baud <= 24000000);
/* Output the result */
test_assert_true(test, max_baud,
"Test failed at baudrate: %lu", test_baud);
}
/*---------------------------------------------------------------------------*/
void
st7565s_arch_spi_select(bool is_data)
{
spi_select_slave(&esd_spi_master_instance, &st7565s_spi_slave, true);
configure_miso(true);
port_pin_set_output_level(DISPLAY_CMD_DATA_PIN, is_data);
}
/**
* \brief Complete write operation.
*
* \param pad amount of dummy data (bytes) to write to keep 32 bits alignment
* in the internal FIFO.
*/
void ksz8851_fifo_write_end(uint32_t pad)
{
uint8_t outbuf[5];
if (pad > 0) {
spi_write_buffer_wait(&ksz8851snl_master, outbuf, 4 - pad);
}
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, false);
}
/*---------------------------------------------------------------------------*/
void
st7565s_arch_spi_deselect(void)
{
port_pin_set_output_level(DISPLAY_CMD_DATA_PIN, false);
configure_miso(false);
spi_select_slave(&esd_spi_master_instance, &st7565s_spi_slave, false);
}
void test_spi_write() {
// Copy of test_spi_write_ready()
spi_enable(SPI0);
spi_select_slave(SPI0, SPI_SELECTOR_0);
TEST_ASSERT_TRUE(spi_tx_ready(SPI0));
spi_write(SPI0, 0b01011010);
TEST_ASSERT_FALSE(spi_tx_ready(SPI0));
delay_ms(1);
TEST_ASSERT_TRUE(spi_tx_ready(SPI0));
}
void test_spi_read_ready() {
delay_ms(1);
spi_enable(SPI0);
spi_select_slave(SPI0, SPI_SELECTOR_0);
spi_read(SPI0);
spi_write(SPI0, 0b00011100);
TEST_ASSERT_FALSE(spi_rx_ready(SPI0));
delay_ms(1);
TEST_ASSERT_TRUE(spi_rx_ready(SPI0));
}
//! [hal_spiSlaveSel]
uint8_t hal_spiSlaveSel(void * p_spi, bool action)
{
if (p_spi == NULL) {
// LOG_ERR("SPI was not initialized!");
return 0;
}
if (action) {
//! [select_slave]
hal_enterCritical();
spi_select_slave(&st_masterInst, (spiDesc_t *)p_spi, true);
//! [select_slave]
}
else {
//! [deselect_slave]
spi_select_slave(&st_masterInst, (spiDesc_t *)p_spi, false);
hal_exitCritical();
//! [deselect_slave]
}
return 1;
} //! [hal_spiSlaveSel]
bool spi_setup_transfer(SpiTransfer* rq) {
if (!rq->acknowledgement_try_count &&
rq->acknowledgement_mode != kSPINoAcknowledgement) {
rq->acknowledgement_mode = kSPINoAcknowledgement;
}
if (!rq->buffer_size_bytes &&
rq->acknowledgement_mode == kSPINoAcknowledgement) {
// No data to transfer; xfer complete.
if (rq->deselect_slave_when_finished)
spi_select_slave(rq->slave, false);
if (rq->transfer_complete_callback)
rq->transfer_complete_callback(rq);
return false;
}
if (rq->receive_offset < rq->buffer_size_bytes &&
rq->receive_offset + rq->receive_bytes > rq->buffer_size_bytes)
rq->receive_bytes = rq->buffer_size_bytes - rq->receive_offset;
spi_select_slave(rq->slave, true);
rq->slave->control->current_byte = 0;
// Start the transfer by writing data. The interrupt will finish things off.
if (rq->buffer_size_bytes) {
if (rq->use_transmit_constant) {
*chip_spi_transfer_register(rq->slave->control->port) = rq->transmit_constant;
} else {
*chip_spi_transfer_register(rq->slave->control->port) =
((uint8_t*) rq->transfer_buffer)[rq->slave->control->current_byte];
}
} else {
*chip_spi_transfer_register(rq->slave->control->port) = rq->acknowledgement_request_byte;
}
return true;
}
void test_spi_transmission_complete() {
delay_ms(1);
spi_enable(SPI0);
spi_select_slave(SPI0, SPI_SELECTOR_0);
spi_write(SPI0, 0b01011010);
spi_write(SPI0, 0b01011011);
TEST_ASSERT_FALSE(SPI0->SPI_SR & (0x1u << 1));
TEST_ASSERT_FALSE(SPI0->SPI_SR & (0x1u << 9));
delay_ms(1);
TEST_ASSERT_TRUE(SPI0->SPI_SR & (0x1u << 1));
TEST_ASSERT_TRUE(SPI0->SPI_SR & (0x1u << 9));
}
int main(void)
{
//! [main_start]
/* Initialize system */
//! [system_init]
system_init();
//! [system_init]
//! [run_config]
configure_spi_master();
//! [run_config]
//! [run_callback_config]
configure_spi_master_callbacks();
//! [run_callback_config]
//! [main_start]
//! [main_use_case]
//! [inf_loop]
while (true) {
/* Infinite loop */
if (!port_pin_get_input_level(BUTTON_0_PIN)) {
//! [select_slave]
spi_select_slave(&spi_master_instance, &slave, true);
//! [select_slave]
//! [write and read]
spi_transceive_buffer_job(&spi_master_instance, wr_buffer,rd_buffer,BUF_LENGTH);
//! [write and read]
//! [wait]
while (!transrev_complete_spi_master) {
/////* Wait for write and read complete */
}
//! [wait]
//! [deselect_slave]
spi_select_slave(&spi_master_instance, &slave, false);
//! [deselect_slave]
}
}
//! [inf_loop]
//! [main_use_case]
}
/**
* \internal
* \brief Test: Send data by polling & receive with interrupt.
*
* This test sends (writes) an array of data to the slave by polling and
* receives (reads) the buffer back with interrupt and compares.
*
* \param test Current test case.
*/
static void run_buffer_polled_write_interrupt_read_test
(const struct test_case *test)
{
uint16_t i;
uint16_t timeout_cycles;
/* Skip test if initialization failed */
test_assert_true(test, spi_init_success,
"Skipping test due to failed initialization");
/* Start the test */
transfer_complete = false;
timeout_cycles = 1000;
spi_select_slave(&master, &slave_inst, true);
spi_read_buffer_job(&slave, rx_buf, BUFFER_LENGTH, 0);
spi_write_buffer_wait(&master, tx_buf, BUFFER_LENGTH);
/* Wait until reception completes */
do {
timeout_cycles--;
if (transfer_complete) {
break;
}
} while (timeout_cycles != 0);
spi_select_slave(&master, &slave_inst, false);
test_assert_true(test, timeout_cycles > 0,
"Timeout in reception");
/* Compare received data with transmitted data */
if (transfer_complete) {
for (i = 0; i < BUFFER_LENGTH; i++) {
test_assert_true(test, tx_buf[i] == rx_buf[i],
"Bytes differ at buffer index %d : %d != %d",
i, tx_buf[i], rx_buf[i]);
}
}
}
void rom_write(uint32_t address, const uint8_t *buffer, uint32_t size) {
int i;
while(size >= 256) {
rom_write_enable();
while(rom_status() & 0x1);
spi_select_slave(SPI_SLAVE_ROM);
spi_send_recv(ROM_COMMAND_PAGE_PROGRAM);
spi_send_recv((address >> 16) & 0xFF);
spi_send_recv((address >> 8) & 0xFF);
spi_send_recv(address & 0xFF);
for(i = 0; i < 256; i++)
spi_send_recv(*buffer++);
spi_select_slave(SPI_SLAVE_NONE);
size -= 256;
address += 256;
}
if(size) {
rom_write_enable();
while(rom_status() & 0x1);
spi_select_slave(SPI_SLAVE_ROM);
spi_send_recv(ROM_COMMAND_PAGE_PROGRAM);
spi_send_recv((address >> 16) & 0xFF);
spi_send_recv((address >> 8) & 0xFF);
spi_send_recv(address & 0xFF);
for(i = 0; i < size; i++)
spi_send_recv(*buffer++);
spi_select_slave(SPI_SLAVE_NONE);
}
}
/**
* \brief Read internal fifo buffer.
*
* \param buf the buffer to store the data from the fifo buffer.
* \param len the amount of data to read.
*/
void ksz8851_fifo_read(uint8_t *buf, uint32_t len)
{
uint8_t tmpbuf[9];
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, true);
tmpbuf[0] = FIFO_READ;
/* Perform SPI transfer. */
spi_transceive_buffer_wait(&ksz8851snl_master, tmpbuf, tmpbuf, 9);
spi_read_buffer_wait(&ksz8851snl_master, buf, len, 0xff);
/* Read CRC (don't care). */
spi_read_buffer_wait(&ksz8851snl_master, tmpbuf, 4, 0xff);
len += 4;
/* Keep internal memory alignment. */
len &= 3;
if (len) {
spi_read_buffer_wait(&ksz8851snl_master, tmpbuf, len, 0xff);
}
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, false);
}
/**
* \brief Start to write internal fifo buffer.
*
* \param tot_len the total amount of data to write.
*/
void ksz8851_fifo_write_begin(uint32_t tot_len)
{
uint8_t outbuf[5];
static uint8_t frameID = 0;
spi_select_slave(&ksz8851snl_master, &ksz8851snl_slave, true);
/* Prepare control word and byte count. */
outbuf[0] = FIFO_WRITE;
outbuf[1] = frameID++ & 0x3f;
outbuf[2] = 0;
outbuf[3] = tot_len & 0xff;
outbuf[4] = tot_len >> 8;
/* Perform SPI transfer. */
spi_write_buffer_wait(&ksz8851snl_master, outbuf, 5);
}