diff options
Diffstat (limited to 'examples/device/cdc_dual_ports/src/main.c')
| -rw-r--r-- | examples/device/cdc_dual_ports/src/main.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/examples/device/cdc_dual_ports/src/main.c b/examples/device/cdc_dual_ports/src/main.c index 34cd29edd..0264f0566 100644 --- a/examples/device/cdc_dual_ports/src/main.c +++ b/examples/device/cdc_dual_ports/src/main.c @@ -39,7 +39,8 @@ int main(void) { board_init(); - tusb_init(); + // init device stack on configured roothub port + tud_init(BOARD_TUD_RHPORT); while (1) { @@ -54,17 +55,19 @@ int main(void) // with Serial0 as all lower case, Serial1 as all upper case static void echo_serial_port(uint8_t itf, uint8_t buf[], uint32_t count) { + uint8_t const case_diff = 'a' - 'A'; + for(uint32_t i=0; i<count; i++) { if (itf == 0) { // echo back 1st port as lower case - if (isupper(buf[i])) buf[i] += 'a' - 'A'; + if (isupper(buf[i])) buf[i] += case_diff; } else { // echo back 2nd port as upper case - if (islower(buf[i])) buf[i] -= 'a' - 'A'; + if (islower(buf[i])) buf[i] -= case_diff; } tud_cdc_n_write_char(itf, buf[i]); |