16.8.4.1.2 Code
Add to the main application source file, outside of any functions:
Copy-paste the following setup code to your user application:static
struct
usart_module cdc_instance,lin_instance;
#define LIN_ID_FIELD_VALUE 0x64
#define LIN_DATA_LEN 5
static
uint8_t rx_buffer[LIN_DATA_LEN]={0};
const
static
uint8_t tx_buffer[LIN_DATA_LEN]={0x4a,0x55,0x93,0xe5,0xe6};
Add to user application initialization (typically the start of main()):static
void
configure_usart_cdc(
void
)
{
struct
usart_config config_cdc;
usart_get_config_defaults(&config_cdc);
config_cdc.baudrate = 115200;
config_cdc.mux_setting = EDBG_CDC_SERCOM_MUX_SETTING;
config_cdc.pinmux_pad0 = EDBG_CDC_SERCOM_PINMUX_PAD0;
config_cdc.pinmux_pad1 = EDBG_CDC_SERCOM_PINMUX_PAD1;
config_cdc.pinmux_pad2 = EDBG_CDC_SERCOM_PINMUX_PAD2;
config_cdc.pinmux_pad3 = EDBG_CDC_SERCOM_PINMUX_PAD3;
stdio_serial_init(&cdc_instance, EDBG_CDC_MODULE, &config_cdc);
usart_enable(&cdc_instance);
}
static
void
lin_read_callback(
struct
usart_module *
const
usart_module)
{
uint8_t i = 0;
if
(CONF_LIN_NODE_TYPE == LIN_MASTER_NODE) {
for
(i = 0; i < LIN_DATA_LEN; i++){
if
(rx_buffer[i] != tx_buffer[i]) {
printf(
"Data error\r\n"
);
break
;
}
}
if
(i == LIN_DATA_LEN){
printf(
"Slave response: OK\r\n"
);
}
}
else
if
(CONF_LIN_NODE_TYPE == LIN_SLAVE_NODE) {
if
(rx_buffer[0] == LIN_ID_FIELD_VALUE) {
usart_enable_transceiver(&lin_instance,USART_TRANSCEIVER_TX);
printf(
"Receive ID field from mater: OK \r\n"
);
usart_write_buffer_job(&lin_instance,
(uint8_t *)tx_buffer, LIN_DATA_LEN);
}
}
}
static
void
lin_read_error_callback(
struct
usart_module *
const
usart_module)
{
printf(
"Data Read error\r\n"
);
}
static
void
configure_usart_lin(
void
)
{
struct
port_config pin_conf;
port_get_config_defaults(&pin_conf);
pin_conf.direction = PORT_PIN_DIR_OUTPUT;
port_pin_set_config(LIN_EN_PIN, &pin_conf);
/* Enable LIN module*/
port_pin_set_output_level(LIN_EN_PIN, 1);
struct
usart_config config_lin;
usart_get_config_defaults(&config_lin);
/* LIN frame format*/
config_lin.lin_node = CONF_LIN_NODE_TYPE;
config_lin.transfer_mode = USART_TRANSFER_ASYNCHRONOUSLY;
config_lin.sample_rate = USART_SAMPLE_RATE_16X_FRACTIONAL;
config_lin.baudrate = 115200;
config_lin.mux_setting = LIN_USART_SERCOM_MUX_SETTING;
config_lin.pinmux_pad0 = LIN_USART_SERCOM_PINMUX_PAD0;
config_lin.pinmux_pad1 = LIN_USART_SERCOM_PINMUX_PAD1;
config_lin.pinmux_pad2 = LIN_USART_SERCOM_PINMUX_PAD2;
config_lin.pinmux_pad3 = LIN_USART_SERCOM_PINMUX_PAD3;
/* Disable receiver and transmitter */
config_lin.receiver_enable =
false
;
config_lin.transmitter_enable =
false
;
if
(CONF_LIN_NODE_TYPE == LIN_SLAVE_NODE) {
config_lin.lin_slave_enable =
true
;
}
while
(usart_init(&lin_instance,
LIN_USART_MODULE, &config_lin) != STATUS_OK) {
}
usart_enable(&lin_instance);
usart_register_callback(&lin_instance,
lin_read_callback, USART_CALLBACK_BUFFER_RECEIVED);
usart_enable_callback(&lin_instance, USART_CALLBACK_BUFFER_RECEIVED);
usart_register_callback(&lin_instance,
lin_read_error_callback, USART_CALLBACK_ERROR);
usart_enable_callback(&lin_instance, USART_CALLBACK_ERROR);
system_interrupt_enable_global();
}
system_init();
configure_usart_cdc();