void esp_sj_uart_dispatcher(void *arg) {
int uart_no = (int) arg;
struct esp_sj_uart_state *us = &sj_us[uart_no];
cs_rbuf_t *txb = esp_uart_tx_buf(uart_no);
us->dispatch_pending = 0;
esp_uart_dispatch_rx_top(uart_no);
uint16_t tx_used_before = txb->used;
/* ignore unused because of CS_DISABLE_JS below */
(void) tx_used_before;
esp_uart_dispatch_tx_top(uart_no);
#ifndef CS_DISABLE_JS
cs_rbuf_t *rxb = esp_uart_rx_buf(uart_no);
if (us->v7 != NULL) {
/* Detect the edge of TX buffer becoming empty. */
if (tx_used_before > 0 && txb->used == 0) {
v7_val_t txcb = v7_get(us->v7, us->obj, "_txcb", 5);
if (v7_is_callable(us->v7, txcb)) {
sj_invoke_cb(us->v7, txcb, us->obj, V7_UNDEFINED);
}
}
if (rxb->used > 0) {
/* Check for JS recv handler. */
v7_val_t rxcb = esp_sj_uart_get_recv_handler(uart_no);
if (v7_is_callable(us->v7, rxcb)) {
if (!us->recv_pending) {
us->recv_pending = 1;
sj_invoke_cb(us->v7, rxcb, us->obj, V7_UNDEFINED);
/* Note: Callback has not run yet, it has been scheduled. */
}
} else if (us->prompt) {
uint8_t *cp;
while (rxb != NULL && cs_rbuf_get(rxb, 1, &cp) == 1) {
char c = (char) *cp;
cs_rbuf_consume(rxb, 1);
sj_prompt_process_char(c);
/* UART could've been re-initialized by the command from prompt. */
rxb = esp_uart_rx_buf(uart_no);
}
}
}
}
#endif
esp_uart_dispatch_bottom(uart_no);
}
static enum v7_err UART_recv(struct v7 *v7, v7_val_t *res) {
struct esp_sj_uart_state *us;
enum v7_err ret = esp_sj_uart_get_state(v7, &us);
if (ret != V7_OK) return ret;
cs_rbuf_t *rxb = esp_uart_rx_buf(us->uart_no);
size_t len = MIN((size_t) v7_to_number(v7_arg(v7, 0)), rxb->used);
uint8_t *data;
len = cs_rbuf_get(rxb, len, &data);
*res = v7_mk_string(v7, (const char *) data, len, 1 /* copy */);
cs_rbuf_consume(rxb, len);
us->recv_pending = 0;
/* This is required to unblock interrupts after buffer has been filled.
* And won't hurt in general. */
esp_sj_uart_schedule_dispatcher(us->uart_no);
return V7_OK;
}