/**
* \brief Start waiting new command.
*/
static void spi_slave_new_command(void)
{
switch (gs_ul_spi_state) {
case SLAVE_STATE_IDLE:
case SLAVE_STATE_END:
gs_ul_spi_cmd = RC_SYN;
spi_slave_transfer(&gs_ul_spi_cmd, sizeof(gs_ul_spi_cmd));
break;
case SLAVE_STATE_TEST:
gs_ul_spi_cmd = RC_RDY;
spi_slave_transfer(&gs_ul_spi_cmd, sizeof(gs_ul_spi_cmd));
break;
case SLAVE_STATE_DATA:
if (gs_spi_status.ul_total_block_number < gs_ul_test_block_number) {
spi_slave_transfer(gs_uc_spi_buffer, COMM_BUFFER_SIZE);
}
break;
case SLAVE_STATE_STATUS_ENTRY:
gs_ul_spi_cmd = RC_RDY;
spi_slave_transfer(&gs_ul_spi_cmd, sizeof(gs_ul_spi_cmd));
gs_ul_spi_state = SLAVE_STATE_STATUS;
break;
case SLAVE_STATE_STATUS:
gs_ul_spi_cmd = RC_SYN;
spi_slave_transfer(&gs_spi_status, sizeof(struct status_block_t));
gs_ul_spi_state = SLAVE_STATE_END;
break;
}
}
/**
* \brief Initialize SPI as slave.
*/
static void spi_slave_initialize(void)
{
uint32_t i;
/* Reset status */
gs_spi_status.ul_total_block_number = 0;
gs_spi_status.ul_total_command_number = 0;
for (i = 0; i < NB_STATUS_CMD; i++) {
gs_spi_status.ul_cmd_list[i] = 0;
}
gs_ul_spi_state = SLAVE_STATE_IDLE;
gs_ul_spi_cmd = RC_SYN;
puts("-I- Initialize SPI as slave \r");
/* Configure an SPI peripheral. */
spi_enable_clock(SPI_SLAVE_BASE);
spi_disable(SPI_SLAVE_BASE);
spi_reset(SPI_SLAVE_BASE);
spi_set_slave_mode(SPI_SLAVE_BASE);
spi_disable_mode_fault_detect(SPI_SLAVE_BASE);
spi_set_peripheral_chip_select_value(SPI_SLAVE_BASE, SPI_CHIP_SEL);
spi_set_clock_polarity(SPI_SLAVE_BASE, SPI_CHIP_SEL, SPI_CLK_POLARITY);
spi_set_clock_phase(SPI_SLAVE_BASE, SPI_CHIP_SEL, SPI_CLK_PHASE);
spi_set_bits_per_transfer(SPI_SLAVE_BASE, SPI_CHIP_SEL, SPI_CSR_BITS_8_BIT);
spi_enable_interrupt(SPI_SLAVE_BASE, SPI_IER_RDRF);
spi_enable(SPI_SLAVE_BASE);
/* Start waiting command. */
spi_slave_transfer(&gs_ul_spi_cmd, sizeof(gs_ul_spi_cmd));
}
/**
* \brief Interrupt handler for the SPI slave.
*/
void SPI_Handler(void)
{
uint32_t status;
status = spi_read_status(SPI_SLAVE_BASE) ;
if(status & SPI_SR_NSSR) {
if ( status & SPI_SR_RXBUFF ) {
spi_slave_transfer(gs_uc_spi_s_tbuffer, COMM_BUFFER_SIZE,
gs_uc_spi_s_rbuffer, COMM_BUFFER_SIZE);
}
}
}
/**
* \brief Initialize SPI as slave.
*/
static void spi_slave_initialize(void)
{
uint32_t i;
/* Get pointer to SPI slave PDC register base */
g_p_spis_pdc = spi_get_pdc_base(SPI_MASTER_BASE);
puts("-I- Initialize SPI as slave \r");
for (i = 0; i < COMM_BUFFER_SIZE; i++) {
gs_uc_spi_s_tbuffer[i] = i;
}
#if (SAMG55)
/* Enable the peripheral and set SPI mode. */
flexcom_enable(BOARD_FLEXCOM_SPI);
flexcom_set_opmode(BOARD_FLEXCOM_SPI, FLEXCOM_SPI);
#else
/* Configure an SPI peripheral. */
pmc_enable_periph_clk(SPI_ID);
#endif
spi_disable(SPI_SLAVE_BASE);
spi_reset(SPI_SLAVE_BASE);
spi_set_slave_mode(SPI_SLAVE_BASE);
spi_disable_mode_fault_detect(SPI_SLAVE_BASE);
spi_set_peripheral_chip_select_value(SPI_SLAVE_BASE, SPI_CHIP_SEL);
spi_set_clock_polarity(SPI_SLAVE_BASE, SPI_CHIP_SEL, SPI_CLK_POLARITY);
spi_set_clock_phase(SPI_SLAVE_BASE, SPI_CHIP_SEL, SPI_CLK_PHASE);
spi_set_bits_per_transfer(SPI_SLAVE_BASE, SPI_CHIP_SEL,
SPI_CSR_BITS_8_BIT);
spi_enable(SPI_SLAVE_BASE);
pdc_disable_transfer(g_p_spis_pdc, PERIPH_PTCR_RXTDIS |
PERIPH_PTCR_TXTDIS);
spi_slave_transfer(gs_uc_spi_s_tbuffer, COMM_BUFFER_SIZE,
gs_uc_spi_s_rbuffer, COMM_BUFFER_SIZE);
}
/*! \brief Main function.
*/
int main(void)
{
sysclk_init();
/* Initialize the board.
* The board-specific conf_board.h file contains the configuration of
* the board initialization.
*/
board_init();
/* Config the USART_SPI in master mode. */
usart_spi_init(USART_SPI_EXAMPLE);
usart_spi_setup_device(USART_SPI_EXAMPLE, &USART_SPI_DEVICE_EXAMPLE,
SPI_MODE_0, USART_SPI_EXAMPLE_BAUDRATE, 0);
usart_spi_enable(USART_SPI_EXAMPLE);
/* Config the SPI module in slave mode. */
spi_slave_init(SPI_SLAVE_EXAMPLE, SPI_MODE_0);
spi_enable(SPI_SLAVE_EXAMPLE);
/* Enable global interrupt */
cpu_irq_enable();
/* Show the test result by LED. */
if (spi_usart_master_transfer() == true && spi_slave_transfer() ==
true) {
ioport_set_pin_level(SPI_SLAVE_EXAMPLE_LED_PIN,
IOPORT_PIN_LEVEL_LOW);
} else {
ioport_set_pin_level(SPI_SLAVE_EXAMPLE_LED_PIN,
IOPORT_PIN_LEVEL_HIGH);
}
while (1) {
/* Do nothing */
}
}
