/**
* \brief De-select the given device on the SPI bus.
*
* \param p_usart Base address of the USART instance.
* \param device SPI device.
*/
void usart_spi_deselect_device(volatile avr32_usart_t *p_usart,
struct usart_spi_device *device)
{
/* avoid Cppcheck Warning */
UNUSED(device);
usart_spi_unselectChip(p_usart);
}
/*! \brief This is an example demonstrating the SPI mode of USART IP
* functionalities using the USART driver.
*/
int main(void)
{
#if BOARD == STK600_RCUC3D
// Configure OSC0 in crystal mode, external crystal with a FOSC0 Hz frequency.
scif_configure_osc_crystalmode(SCIF_OSC0, FOSC0);
// Enable the OSC0
scif_enable_osc(SCIF_OSC0, OSC0_STARTUP, true);
// Set the main clock source as being OSC0.
pm_set_mclk_source(PM_CLK_SRC_OSC0);
#else
// Switch main clock to external oscillator 0 (crystal).
pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);
#endif
static const gpio_map_t USART_GPIO_MAP =
{
{EXAMPLE_USART_RX_PIN, EXAMPLE_USART_RX_FUNCTION},
{EXAMPLE_USART_TX_PIN, EXAMPLE_USART_TX_FUNCTION}
};
static const usart_options_t USART_OPTIONS =
{
.baudrate = 57600,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = USART_NORMAL_CHMODE
};
// Assign GPIO to USART.
gpio_enable_module(USART_GPIO_MAP,
sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
// Initialize USART in RS232 mode.
usart_init_rs232(EXAMPLE_USART, &USART_OPTIONS, FOSC0);
static const gpio_map_t USART_SPI_GPIO_MAP =
{
{EXAMPLE_USART_SPI_SCK_PIN, EXAMPLE_USART_SPI_SCK_FUNCTION },
{EXAMPLE_USART_SPI_MISO_PIN, EXAMPLE_USART_SPI_MISO_FUNCTION},
{EXAMPLE_USART_SPI_MOSI_PIN, EXAMPLE_USART_SPI_MOSI_FUNCTION},
{EXAMPLE_USART_SPI_NSS_PIN, EXAMPLE_USART_SPI_NSS_FUNCTION }
};
static const usart_spi_options_t USART_SPI_OPTIONS =
{
.baudrate = 60000,
.charlength = 8,
.spimode = 0,
.channelmode = USART_NORMAL_CHMODE
};
// Assign GPIO to SPI.
gpio_enable_module(USART_SPI_GPIO_MAP,
sizeof(USART_SPI_GPIO_MAP) / sizeof(USART_SPI_GPIO_MAP[0]));
// Initialize USART in SPI mode.
usart_init_spi_master(EXAMPLE_USART_SPI, &USART_SPI_OPTIONS, FOSC0);
// Show startup message
usart_write_line(EXAMPLE_USART, "Basic write in USART SPI Mode (press enter)\r\n");
// Press enter to continue.
while (usart_get_echo_line(EXAMPLE_USART) == USART_FAILURE); // Get and echo characters until end of line.
usart_write_line(EXAMPLE_USART, "Writing SPI test pattern.\r\n");
while (true)
{
usart_spi_selectChip(EXAMPLE_USART_SPI);
usart_putchar(EXAMPLE_USART_SPI, 0x55);
usart_putchar(EXAMPLE_USART_SPI, 0xAA);
usart_spi_unselectChip(EXAMPLE_USART_SPI);
}
}
