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esp32/usb: Cleanup connection detection.

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This was introduced by 35fb90bd57, but
it is much simpler and essentially the same to just use
`tud_cdc_n_connected()`.

The only difference is that tud_cdc_n_connected() only checks for DTR,
but this is correct anyway: DTR indicates device presence, RTS indicates
that the host wants to receive data.

Signed-off-by: Damien Tournoud <damien@platform.sh>
This commit is contained in:
Damien Tournoud 2022-12-13 20:38:48 -08:00
parent 9bec52a2f8
commit fd1e66edb3
1 changed files with 2 additions and 11 deletions
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13
ports/esp32/usb.c
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@ -36,7 +36,6 @@
#define CDC_ITF TINYUSB_CDC_ACM_0
static uint8_t usb_rx_buf[CONFIG_USB_CDC_RX_BUFSIZE];
static uint8_t usb_cdc_connected;
static void usb_callback_rx(int itf, cdcacm_event_t *event) {
// TODO: what happens if more chars come in during this function, are they lost?
@ -59,13 +58,6 @@ static void usb_callback_rx(int itf, cdcacm_event_t *event) {
}
}
void usb_callback_line_state_changed(int itf, cdcacm_event_t *event) {
int dtr = event->line_state_changed_data.dtr;
int rts = event->line_state_changed_data.rts;
// If dtr && rts are both true, the CDC is connected to a HOST.
usb_cdc_connected = dtr && rts;
}
void usb_init(void) {
// Initialise the USB with defaults.
tinyusb_config_t tusb_cfg = {0};
@ -78,10 +70,9 @@ void usb_init(void) {
.rx_unread_buf_sz = 256,
.callback_rx = &usb_callback_rx,
.callback_rx_wanted_char = NULL,
.callback_line_state_changed = &usb_callback_line_state_changed,
.callback_line_state_changed = NULL,
.callback_line_coding_changed = NULL
};
usb_cdc_connected = 0;
ESP_ERROR_CHECK(tusb_cdc_acm_init(&amc_cfg));
}
@ -89,7 +80,7 @@ void usb_init(void) {
void usb_tx_strn(const char *str, size_t len) {
// Write out the data to the CDC interface, but only while the USB host is connected.
uint64_t timeout = esp_timer_get_time() + (uint64_t)(MICROPY_HW_USB_CDC_TX_TIMEOUT * 1000);
while (usb_cdc_connected && len && esp_timer_get_time() < timeout) {
while (tud_cdc_n_connected(CDC_ITF) && len && esp_timer_get_time() < timeout) {
size_t l = tinyusb_cdcacm_write_queue(CDC_ITF, (uint8_t *)str, len);
str += l;
len -= l;