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subsys: console: tty: Allow to specify receive timeout

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This allows to specify receive timeout, instead of previously
hardcoded K_FOREVER value. K_FOREVER is still the default, and can
be changes after tty initialization using tty_set_rx_timeout() call,
and timeout is stored as a property of tty. (Instead of e.g. being
a param of each receive call. Handling like that is required for
POSIX-like behavior of tty).

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
This commit is contained in:
Paul Sokolovsky 2018-10-22 21:01:22 +03:00 committed by Anas Nashif
parent 79ea613a32
commit 680085b3e2
3 changed files with 27 additions and 4 deletions
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18
include/console.h
View file

@ -21,6 +21,7 @@ struct tty_serial {
u8_t *rx_ringbuf;
u32_t rx_ringbuf_sz;
u16_t rx_get, rx_put;
s32_t rx_timeout;
u8_t *tx_ringbuf;
u32_t tx_ringbuf_sz;
@ -47,13 +48,28 @@ void tty_init(struct tty_serial *tty, struct device *uart_dev,
u8_t *rxbuf, u16_t rxbuf_sz,
u8_t *txbuf, u16_t txbuf_sz);
/**
* @brief Set receive timeout for tty device.
*
* Set timeout for getchar() operation. 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_rx_timeout(struct tty_serial *tty, s32_t timeout)
{
tty->rx_timeout = timeout;
}
/**
* @brief Input a character from a tty device.
*
* @param tty tty device structure
* @return >=0, an input character
* <0, an error (e.g. -EAGAIN if timeout expired)
*/
u8_t tty_getchar(struct tty_serial *tty);
int tty_getchar(struct tty_serial *tty);
/**
* @brief Output a character from to tty device.

3
subsys/console/getchar.c
View file

@ -20,7 +20,8 @@ int console_putchar(char c)
u8_t console_getchar(void)
{
return tty_getchar(&console_serial);
/* Console works in blocking mode, so we don't expect an error here */
return (u8_t)tty_getchar(&console_serial);
}
void console_init(void)

10
subsys/console/tty.c
View file

@ -91,12 +91,16 @@ int tty_putchar(struct tty_serial *tty, u8_t c)
return 0;
}
u8_t tty_getchar(struct tty_serial *tty)
int tty_getchar(struct tty_serial *tty)
{
unsigned int key;
u8_t c;
int res;
k_sem_take(&tty->rx_sem, K_FOREVER);
res = k_sem_take(&tty->rx_sem, tty->rx_timeout);
if (res < 0) {
return res;
}
key = irq_lock();
c = tty->rx_ringbuf[tty->rx_get++];
@ -120,6 +124,8 @@ void tty_init(struct tty_serial *tty, struct device *uart_dev,
tty->rx_get = tty->rx_put = tty->tx_get = tty->tx_put = 0;
k_sem_init(&tty->rx_sem, 0, UINT_MAX);
tty->rx_timeout = K_FOREVER;
uart_irq_callback_user_data_set(uart_dev, tty_uart_isr, tty);
uart_irq_rx_enable(uart_dev);
}