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samples: uart: Test irq-based APIs

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This patch extends the uart sample so the same functionality (write
buffer, read char then write buffer again) is implemented using
irq-based APIs.

Change-Id: Iefb14dae2b253f90da64ccef8c123619ed494aca
Signed-off-by: Andre Guedes <andre.guedes@intel.com>
This commit is contained in:
Andre Guedes 2016-03-04 20:30:12 -03:00 • committed by Gerrit Code Review
commit eeec6088aa
2 changed files with 69 additions and 2 deletions
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1
samples/drivers/uart/prj.config
View file

@ -1 +1,2 @@
CONFIG_SERIAL=y CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y

70
samples/drivers/uart/src/main.c
View file

@ -32,15 +32,18 @@ static const char *banner2 = "Character read:\n";
#define UART_DEVICE "UART_0" #define UART_DEVICE "UART_0"
#endif #endif
static volatile bool data_transmitted;
static volatile bool data_arrived;
static char new_data;
static void write_string(struct device *dev, const char *str, int len) static void write_string(struct device *dev, const char *str, int len)
{ {
for (int i = 0; i < len; i++) for (int i = 0; i < len; i++)
uart_poll_out(dev, str[i]); uart_poll_out(dev, str[i]);
} }
void main(void) static void test_by_polling(struct device *dev)
{ {
struct device *dev = device_get_binding(UART_DEVICE);
unsigned char data; unsigned char data;
write_string(dev, banner1, strlen(banner1)); write_string(dev, banner1, strlen(banner1));
@ -53,3 +56,66 @@ void main(void)
write_string(dev, &data, 1); write_string(dev, &data, 1);
write_string(dev, "\n", 1); write_string(dev, "\n", 1);
} }
static void interrupt_handler(struct device *dev)
{
uart_irq_update(dev);
if (uart_irq_tx_ready(dev)) {
data_transmitted = true;
}
if (uart_irq_rx_ready(dev)) {
uart_fifo_read(dev, &new_data, 1);
data_arrived = true;
}
}
static void read_char_irq(struct device *dev, char *data)
{
uart_irq_rx_enable(dev);
data_arrived = false;
while (data_arrived == false)
;
*data = new_data;
uart_irq_rx_disable(dev);
}
static void write_buf_irq(struct device *dev, const char *buf, int len)
{
int i;
uart_irq_tx_enable(dev);
for (i = 0; i < len; i++) {
data_transmitted = false;
uart_fifo_fill(dev, &buf[i], 1);
while (data_transmitted == false)
;
}
uart_irq_tx_disable(dev);
}
static void test_by_irq(struct device *dev)
{
char data;
uart_irq_callback_set(dev, interrupt_handler);
write_buf_irq(dev, banner1, strlen(banner1));
read_char_irq(dev, &data);
write_buf_irq(dev, banner2, strlen(banner2));
write_buf_irq(dev, &data, sizeof(data));
write_buf_irq(dev, "\n", 1);
}
void main(void)
{
struct device *dev = device_get_binding(UART_DEVICE);
test_by_polling(dev);
test_by_irq(dev);
}