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drivers: uart for LPC devices interrupt enabled

NXP's MCU LPC families uart interrupt was enabled.

Signed-off-by: Andrei Gansari <andrei.gansari@nxp.com>
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agansari authored and MaureenHelm committed May 8, 2019
1 parent bf0f6d9 commit 58e05ddcc10df0bbd7739d6809097b3a8b315fd7
@@ -11,6 +11,7 @@ CONFIG_BOARD_LPCXPRESSO54114_M4=y
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_CORTEX_M_SYSTICK=y
CONFIG_GPIO=y
CONFIG_PINMUX=y
@@ -10,6 +10,7 @@ CONFIG_BOARD_LPCXPRESSO55S69_CPU0=y
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_CORTEX_M_SYSTICK=y
CONFIG_GPIO=y
CONFIG_PINMUX=y
@@ -8,6 +8,7 @@ menuconfig USART_MCUX_LPC
bool "MCUX USART driver"
depends on HAS_MCUX
select SERIAL_HAS_DRIVER
select SERIAL_SUPPORT_INTERRUPT
help
Enable the MCUX USART driver.

@@ -5,12 +5,11 @@
*/

/** @file
* @brief USART driver for LPC54XXX family
* @brief USART driver for LPC54XXX and LPC55xxx families.
*
* Note:
* - Only basic USART features sufficient to support printf functionality
* are currently implemented.
* - The driver works only in polling mode, interrupt mode is not implemented.
* - The driver is implemented for only one device, multiple instances
* will be implemented in the future.
*/

#include <errno.h>
@@ -25,10 +24,16 @@ struct usart_mcux_lpc_config {
USART_Type *base;
clock_name_t clock_source;
u32_t baud_rate;
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
void (*irq_config_func)(struct device *dev);
#endif
};

struct usart_mcux_lpc_data {
/* put irq call back instance when required */
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
uart_irq_callback_user_data_t callback;
void *cb_data;
#endif
};

static int usart_mcux_lpc_poll_in(struct device *dev, unsigned char *c)
@@ -83,6 +88,158 @@ static int usart_mcux_lpc_err_check(struct device *dev)
return err;
}

#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static int usart_mcux_lpc_fifo_fill(struct device *dev, const u8_t *tx_data,
int len)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u8_t num_tx = 0U;

while ((len - num_tx > 0) &&
(USART_GetStatusFlags(config->base)
& kUSART_TxFifoNotFullFlag)) {

USART_WriteByte(config->base, tx_data[num_tx++]);
}

return num_tx;
}

static int usart_mcux_lpc_fifo_read(struct device *dev, u8_t *rx_data,
const int len)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u8_t num_rx = 0U;

while ((len - num_rx > 0) &&
(USART_GetStatusFlags(config->base)
& kUSART_RxFifoNotEmptyFlag)) {

rx_data[num_rx++] = USART_ReadByte(config->base);
}

return num_rx;
}

static void usart_mcux_lpc_irq_tx_enable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_TxLevelInterruptEnable;

USART_EnableInterrupts(config->base, mask);
}

static void usart_mcux_lpc_irq_tx_disable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_TxLevelInterruptEnable;

USART_DisableInterrupts(config->base, mask);
}

static int usart_mcux_lpc_irq_tx_complete(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t flags = USART_GetStatusFlags(config->base);

return (flags & kUSART_TxFifoEmptyFlag) != 0U;
}

static int usart_mcux_lpc_irq_tx_ready(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_TxLevelInterruptEnable;

return (USART_GetEnabledInterrupts(config->base) & mask)
&& usart_mcux_lpc_irq_tx_complete(dev);
}

static void usart_mcux_lpc_irq_rx_enable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_RxLevelInterruptEnable;

USART_EnableInterrupts(config->base, mask);
}

static void usart_mcux_lpc_irq_rx_disable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_RxLevelInterruptEnable;

USART_DisableInterrupts(config->base, mask);
}

static int usart_mcux_lpc_irq_rx_full(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t flags = USART_GetStatusFlags(config->base);

return (flags & kUSART_RxFifoNotEmptyFlag) != 0U;
}

static int usart_mcux_lpc_irq_rx_ready(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kUSART_RxLevelInterruptEnable;

return (USART_GetEnabledInterrupts(config->base) & mask)
&& usart_mcux_lpc_irq_rx_full(dev);
}

static void usart_mcux_lpc_irq_err_enable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kStatus_USART_NoiseError |
kStatus_USART_FramingError |
kStatus_USART_ParityError;

USART_EnableInterrupts(config->base, mask);
}

static void usart_mcux_lpc_irq_err_disable(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
u32_t mask = kStatus_USART_NoiseError |
kStatus_USART_FramingError |
kStatus_USART_ParityError;

USART_DisableInterrupts(config->base, mask);
}

static int usart_mcux_lpc_irq_is_pending(struct device *dev)
{
return (usart_mcux_lpc_irq_tx_ready(dev)
|| usart_mcux_lpc_irq_rx_ready(dev));
}

static int usart_mcux_lpc_irq_update(struct device *dev)
{
return 1;
}

static void usart_mcux_lpc_irq_callback_set(struct device *dev,
uart_irq_callback_user_data_t cb,
void *cb_data)
{
struct usart_mcux_lpc_data *data = dev->driver_data;

data->callback = cb;
data->cb_data = cb_data;
}

static void usart_mcux_lpc_isr(void *arg)
{
struct device *dev = arg;
struct usart_mcux_lpc_data *data = dev->driver_data;

if (data->callback) {
data->callback(data->cb_data);
}
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */


static int usart_mcux_lpc_init(struct device *dev)
{
const struct usart_mcux_lpc_config *config = dev->config->config_info;
@@ -98,20 +255,47 @@ static int usart_mcux_lpc_init(struct device *dev)

USART_Init(config->base, &usart_config, clock_freq);

#ifdef CONFIG_UART_INTERRUPT_DRIVEN
config->irq_config_func(dev);
#endif

return 0;
}

static const struct uart_driver_api usart_mcux_lpc_driver_api = {
.poll_in = usart_mcux_lpc_poll_in,
.poll_out = usart_mcux_lpc_poll_out,
.err_check = usart_mcux_lpc_err_check,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = usart_mcux_lpc_fifo_fill,
.fifo_read = usart_mcux_lpc_fifo_read,
.irq_tx_enable = usart_mcux_lpc_irq_tx_enable,
.irq_tx_disable = usart_mcux_lpc_irq_tx_disable,
.irq_tx_complete = usart_mcux_lpc_irq_tx_complete,
.irq_tx_ready = usart_mcux_lpc_irq_tx_ready,
.irq_rx_enable = usart_mcux_lpc_irq_rx_enable,
.irq_rx_disable = usart_mcux_lpc_irq_rx_disable,
.irq_rx_ready = usart_mcux_lpc_irq_rx_ready,
.irq_err_enable = usart_mcux_lpc_irq_err_enable,
.irq_err_disable = usart_mcux_lpc_irq_err_disable,
.irq_is_pending = usart_mcux_lpc_irq_is_pending,
.irq_update = usart_mcux_lpc_irq_update,
.irq_callback_set = usart_mcux_lpc_irq_callback_set,
#endif
};

#ifdef CONFIG_USART_MCUX_LPC_0
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void usart_mcux_lpc_config_func_0(struct device *dev);
#endif

static const struct usart_mcux_lpc_config usart_mcux_lpc_0_config = {
.base = (USART_Type *)DT_USART_MCUX_LPC_0_BASE_ADDRESS,
.clock_source = kCLOCK_Flexcomm0,
.baud_rate = DT_USART_MCUX_LPC_0_BAUD_RATE,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.irq_config_func = usart_mcux_lpc_config_func_0,
#endif
};

static struct usart_mcux_lpc_data usart_mcux_lpc_0_data;
@@ -121,4 +305,16 @@ DEVICE_AND_API_INIT(usart_0, DT_USART_MCUX_LPC_0_NAME,
&usart_mcux_lpc_0_data, &usart_mcux_lpc_0_config,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
&usart_mcux_lpc_driver_api);

#ifdef CONFIG_UART_INTERRUPT_DRIVEN
static void usart_mcux_lpc_config_func_0(struct device *dev)
{
IRQ_CONNECT(DT_USART_MCUX_LPC_0_IRQ,
DT_USART_MCUX_LPC_0_IRQ_PRI,
usart_mcux_lpc_isr, DEVICE_GET(usart_0), 0);

irq_enable(DT_USART_MCUX_LPC_0_IRQ);
}
#endif

#endif /* CONFIG_USART_MCUX_LPC_0 */
@@ -14,6 +14,7 @@

#define DT_USART_MCUX_LPC_0_BASE_ADDRESS DT_NXP_LPC_USART_40086000_BASE_ADDRESS
#define DT_USART_MCUX_LPC_0_BAUD_RATE DT_NXP_LPC_USART_40086000_CURRENT_SPEED
#define DT_USART_MCUX_LPC_0_IRQ DT_NXP_LPC_USART_40086000_IRQ_0
#define DT_USART_MCUX_LPC_0_IRQ_PRI DT_NXP_LPC_USART_40086000_IRQ_0_PRIORITY
#define DT_USART_MCUX_LPC_0_NAME DT_NXP_LPC_USART_40086000_LABEL

@@ -10,6 +10,7 @@

#define DT_USART_MCUX_LPC_0_BASE_ADDRESS DT_NXP_LPC_USART_50086000_BASE_ADDRESS
#define DT_USART_MCUX_LPC_0_BAUD_RATE DT_NXP_LPC_USART_50086000_CURRENT_SPEED
#define DT_USART_MCUX_LPC_0_IRQ DT_NXP_LPC_USART_50086000_IRQ_0
#define DT_USART_MCUX_LPC_0_IRQ_PRI DT_NXP_LPC_USART_50086000_IRQ_0_PRIORITY
#define DT_USART_MCUX_LPC_0_NAME DT_NXP_LPC_USART_50086000_LABEL

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