ChibiOS Free Embedded RTOS

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        // Activates the UART driver 1, PA9(TX) and PA10(RX) are routed to USART1.
        // Activates the UART driver 2, PA2(TX) and PA3(RX) are routed to USART2.
        // Activates the UART driver 3, PB10(TX) and PB11(RX) are routed to USART3.
        // Activates the UART driver 4, PC10(TX) and PC11(RX) are routed to UART4.
        // Activates the UART driver 5, PC12(TX) and PD2(RX) are routed to UART5.
        // Activates the UART driver 6, PC6(TX) and PC7(RX) are routed to USART6.

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while (TRUE) {
                i++;
                if (SDU1.config->usbp->state == USB_ACTIVE) {
                        chprintf((BaseSequentialStream *)&SDU1, "Serial USB: %d\r\n", i);
                }
                chprintf((BaseSequentialStream *)&SD1, "Serial 1: %d\r\n", i);
                chprintf((BaseSequentialStream *)&SD2, "Serial 2: %d\r\n", i);
                chprintf((BaseSequentialStream *)&SD3, "Serial 3: %d\r\n", i);
                chprintf((BaseSequentialStream *)&SD4, "Serial 4: %d\r\n", i);
                chprintf((BaseSequentialStream *)&SD5, "Serial 5: %d\r\n", i);
                chprintf((BaseSequentialStream *)&SD6, "Serial 6: %d\r\n", i);
                chThdSleepMilliseconds(1000);
        }