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subsys: console: tty: Allow to specify transmit timeout

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Previously, transmit was effectively non-blocking - a character either
went into buffer, or -1 was returned. Now it's possible to block if
buffer is full. Timeout is K_FOREVER by default, can be adjusted
with tty_set_tx_timeout() (similar to receive timeout).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
This commit is contained in:
Paul Sokolovsky 2018-10-23 20:02:25 +03:00 • committed by Anas Nashif
commit 9d3b48fd48
2 changed files with 25 additions and 0 deletions
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16
include/console.h
View file

@ -23,9 +23,11 @@ struct tty_serial {
u16_t rx_get, rx_put;
s32_t rx_timeout;
struct k_sem tx_sem;
u8_t *tx_ringbuf;
u32_t tx_ringbuf_sz;
u16_t tx_get, tx_put;
s32_t tx_timeout;
};
/**
@ -62,6 +64,20 @@ static inline void tty_set_rx_timeout(struct tty_serial *tty, s32_t timeout)
tty->rx_timeout = timeout;
}
/**
* @brief Set transmit timeout for tty device.
*
* Set timeout for putchar() operation, for a case when output buffer is full.
* Default timeout after device initialization is K_FOREVER.
*
* @param tty tty device structure
* @param timeout timeout in milliseconds, or K_FOREVER, or K_NO_WAIT
*/
static inline void tty_set_tx_timeout(struct tty_serial *tty, s32_t timeout)
{
tty->tx_timeout = timeout;
}
/**
* @brief Input a character from a tty device.
*

9
subsys/console/tty.c
View file

@ -42,6 +42,7 @@ static void tty_uart_isr(void *user_data)
if (tty->tx_get >= tty->tx_ringbuf_sz) {
tty->tx_get = 0;
}
k_sem_give(&tty->tx_sem);
}
}
}
@ -72,6 +73,12 @@ int tty_putchar(struct tty_serial *tty, u8_t c)
{
unsigned int key;
int tx_next;
int res;
res = k_sem_take(&tty->tx_sem, tty->tx_timeout);
if (res < 0) {
return res;
}
key = irq_lock();
tx_next = tty->tx_put + 1;
@ -123,8 +130,10 @@ void tty_init(struct tty_serial *tty, struct device *uart_dev,
tty->tx_ringbuf_sz = txbuf_sz;
tty->rx_get = tty->rx_put = tty->tx_get = tty->tx_put = 0;
k_sem_init(&tty->rx_sem, 0, UINT_MAX);
k_sem_init(&tty->tx_sem, txbuf_sz - 1, UINT_MAX);
tty->rx_timeout = K_FOREVER;
tty->tx_timeout = K_FOREVER;
uart_irq_callback_user_data_set(uart_dev, tty_uart_isr, tty);
uart_irq_rx_enable(uart_dev);