int main (void) {
init();
led_on();
uart_str("Hello!\r\n");
spi_slave();
led_off();
while (1) {
switch (spi_recv()) {
case 0: break;
case 1:
// CPU wants to read a value. this means we are now the master, to transfer the value back.
spi_master();
spi_send(uart_read());
spi_slave();
break;
case 2:
// CPU wrote a value. Output it to serial.
uart_write(spi_recv());
break;
default:
break;
}
}
}
void spitest_init() {
#if 1
struct spi *spi;
static struct spi_slave *slave[3];
struct spi_opt opt = {
.lsb = false,
.cpol = false,
.cpha = false,
.cs = 0,
.csLowInactive = false,
.gpio = SPI_OPT_GPIO_DIS,
.size = 8,
.wdelay = 0,
.cs_hold = 8,
.cs_delay = 500,
.bautrate = 500000,
};
spi = spi_init(1, SPI_3WIRE_CS, NULL);
CONFIG_ASSERT(spi != NULL);
slave[0] = spiSlave_init(spi, &opt);
CONFIG_ASSERT(slave[0] != NULL);
opt.cs_hold = 6;
opt.cs_delay = 8;
opt.cs = 1;
slave[1] = spiSlave_init(spi, &opt);
CONFIG_ASSERT(slave[1] != NULL);
opt.cs = 2;
slave[2] = spiSlave_init(spi, &opt);
CONFIG_ASSERT(slave[2] != NULL);
#else
struct spi *spi;
static struct spi_slave *slave[3];
struct spi_ops ops = {
.lsb = false,
.cpol = false,
.cpha = false,
.cs = SPI_OPT_CS_DIS,
.csLowInactive = false,
.gpio = PTD5,
.size = 8,
.wdelay = 0,
.cs_hold = 8,
.cs_delay = 500,
.bautrate = 500000,
};
spi = spi_init(1);
CONFIG_ASSERT(spi != NULL);
ops.cpol = false;
ops.cpha = false;
ops.gpio = PTD5; /* CS 0 */
slave[0] = spi_slave(spi, &ops);
CONFIG_ASSERT(slave[0] != NULL);
ops.cpol = false;
ops.cpha = false;
ops.cs_hold = 6;
ops.cs_delay = 8;
ops.gpio = PTD4; /* CS 1 */
slave[1] = spi_slave(spi, &ops);
CONFIG_ASSERT(slave[1] != NULL);
ops.cpol = false;
ops.cpha = false;
ops.gpio = PTD3; /* CS 2 */
slave[2] = spi_slave(spi, &ops);
CONFIG_ASSERT(slave[2] != NULL);
#endif
OS_CREATE_TASK(spiTask, "SPI Test Task", 512, slave, 1, taskSPI);
}
