ExOS: the next-generation OS for microcontrollers. From hardware prototype to commercial product in no time.

#define LED1_MASK (1<<23) int main(){    // Initialize CAN bus through HAL API    hal_can_initialize(0, 250000, CAN_INITF_DISABLE_RETRANSMISSION);     int err;     // Create and set up sockets through OS Services API (dynamic, POSIX)    int server = socket(AF_INET, SOCK_STREAM, 0);    if (server >= 0)    {        struct sockaddr_in local = (struct sockaddr_in)        {            .sin_family = AF_INET,            .sin_addr.s_addr = INADDR_ANY,            .sin_port = htons(23)        };         if (-1 != bind(server, (struct sockaddr *)&local, sizeof(local)) &&            -1 != listen(server, 1))        {            while (1)            {                struct sockaddr_in remote;                socklen_t remote_len;                static unsigned char buffer;                 // Accept connection from network client (OS API)                int fd = accept(server, (struct sockaddr *)&remote, &remote_len);                if (fd == -1) break;                 // Activate GPIO3 pin on an LPC17xx micro (Direct access, no API)                LPC_GPIO3->DIR |= LED1_MASK;                 // Read value (1 byte)                size_t done = read(fd, &buffer, 1);                 // Send the same byte to the CAN bus (HAL API)                CAN_BUFFER data;                data.u8[0] = buffer;                hal_can_send((CAN_EP) { .Id = 0x200, .Bus = 0 }, &data, 1, CANF_PRI_ANY);                 close(fd);                 // Deactivate GPIO3 pin on an LPC17xx micro (Direct access)                LPC_GPIO3->DIR &= ~LED1_MASK;            }        }         err = errno;        close(server);    }}

int main(){    // Open the iAP connection as if it were a serial device    int fd = open("dev/iap/com.miolabs.test_protocol", O_RDWR);     if (fd > 0)    {        char buffer[1024];        // If it's open, read the value sent from the iPhone        int done = read(fd, buffer, sizeof(buffer));        // Write it back to the iPhone        write(fd, buffer, done);         // And close the connection        close(fd);    }}