321 lines
8.2 KiB
C
321 lines
8.2 KiB
C
/*
|
|
* Copyright (c) 2017, NXP
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/** @file
|
|
* @brief USART driver for LPC54XXX and LPC55xxx families.
|
|
*
|
|
* Note:
|
|
* - The driver is implemented for only one device, multiple instances
|
|
* will be implemented in the future.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <device.h>
|
|
#include <drivers/uart.h>
|
|
#include <fsl_usart.h>
|
|
#include <fsl_clock.h>
|
|
#include <soc.h>
|
|
#include <fsl_device_registers.h>
|
|
|
|
struct mcux_flexcomm_config {
|
|
USART_Type *base;
|
|
u32_t clock_source;
|
|
u32_t baud_rate;
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
void (*irq_config_func)(struct device *dev);
|
|
#endif
|
|
};
|
|
|
|
struct mcux_flexcomm_data {
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
uart_irq_callback_user_data_t callback;
|
|
void *cb_data;
|
|
#endif
|
|
};
|
|
|
|
static int mcux_flexcomm_poll_in(struct device *dev, unsigned char *c)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t flags = USART_GetStatusFlags(config->base);
|
|
int ret = -1;
|
|
|
|
if (flags & kUSART_RxFifoFullFlag) {
|
|
*c = USART_ReadByte(config->base);
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void mcux_flexcomm_poll_out(struct device *dev,
|
|
unsigned char c)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
|
|
/* Wait until space is available in TX FIFO */
|
|
while (!(USART_GetStatusFlags(config->base) & kUSART_TxFifoEmptyFlag)) {
|
|
}
|
|
|
|
USART_WriteByte(config->base, c);
|
|
}
|
|
|
|
static int mcux_flexcomm_err_check(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t flags = USART_GetStatusFlags(config->base);
|
|
int err = 0;
|
|
|
|
if (flags & kStatus_USART_RxRingBufferOverrun) {
|
|
err |= UART_ERROR_OVERRUN;
|
|
}
|
|
|
|
if (flags & kStatus_USART_ParityError) {
|
|
err |= UART_ERROR_PARITY;
|
|
}
|
|
|
|
if (flags & kStatus_USART_FramingError) {
|
|
err |= UART_ERROR_FRAMING;
|
|
}
|
|
|
|
USART_ClearStatusFlags(config->base,
|
|
kStatus_USART_RxRingBufferOverrun |
|
|
kStatus_USART_ParityError |
|
|
kStatus_USART_FramingError);
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static int mcux_flexcomm_fifo_fill(struct device *dev, const u8_t *tx_data,
|
|
int len)
|
|
{
|
|
const struct mcux_flexcomm_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 mcux_flexcomm_fifo_read(struct device *dev, u8_t *rx_data,
|
|
const int len)
|
|
{
|
|
const struct mcux_flexcomm_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 mcux_flexcomm_irq_tx_enable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_TxLevelInterruptEnable;
|
|
|
|
USART_EnableInterrupts(config->base, mask);
|
|
}
|
|
|
|
static void mcux_flexcomm_irq_tx_disable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_TxLevelInterruptEnable;
|
|
|
|
USART_DisableInterrupts(config->base, mask);
|
|
}
|
|
|
|
static int mcux_flexcomm_irq_tx_complete(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t flags = USART_GetStatusFlags(config->base);
|
|
|
|
return (flags & kUSART_TxFifoEmptyFlag) != 0U;
|
|
}
|
|
|
|
static int mcux_flexcomm_irq_tx_ready(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_TxLevelInterruptEnable;
|
|
|
|
return (USART_GetEnabledInterrupts(config->base) & mask)
|
|
&& mcux_flexcomm_irq_tx_complete(dev);
|
|
}
|
|
|
|
static void mcux_flexcomm_irq_rx_enable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_RxLevelInterruptEnable;
|
|
|
|
USART_EnableInterrupts(config->base, mask);
|
|
}
|
|
|
|
static void mcux_flexcomm_irq_rx_disable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_RxLevelInterruptEnable;
|
|
|
|
USART_DisableInterrupts(config->base, mask);
|
|
}
|
|
|
|
static int mcux_flexcomm_irq_rx_full(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t flags = USART_GetStatusFlags(config->base);
|
|
|
|
return (flags & kUSART_RxFifoNotEmptyFlag) != 0U;
|
|
}
|
|
|
|
static int mcux_flexcomm_irq_rx_ready(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
u32_t mask = kUSART_RxLevelInterruptEnable;
|
|
|
|
return (USART_GetEnabledInterrupts(config->base) & mask)
|
|
&& mcux_flexcomm_irq_rx_full(dev);
|
|
}
|
|
|
|
static void mcux_flexcomm_irq_err_enable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_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 mcux_flexcomm_irq_err_disable(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_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 mcux_flexcomm_irq_is_pending(struct device *dev)
|
|
{
|
|
return (mcux_flexcomm_irq_tx_ready(dev)
|
|
|| mcux_flexcomm_irq_rx_ready(dev));
|
|
}
|
|
|
|
static int mcux_flexcomm_irq_update(struct device *dev)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void mcux_flexcomm_irq_callback_set(struct device *dev,
|
|
uart_irq_callback_user_data_t cb,
|
|
void *cb_data)
|
|
{
|
|
struct mcux_flexcomm_data *data = dev->driver_data;
|
|
|
|
data->callback = cb;
|
|
data->cb_data = cb_data;
|
|
}
|
|
|
|
static void mcux_flexcomm_isr(void *arg)
|
|
{
|
|
struct device *dev = arg;
|
|
struct mcux_flexcomm_data *data = dev->driver_data;
|
|
|
|
if (data->callback) {
|
|
data->callback(data->cb_data);
|
|
}
|
|
}
|
|
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
|
|
|
|
|
|
static int mcux_flexcomm_init(struct device *dev)
|
|
{
|
|
const struct mcux_flexcomm_config *config = dev->config->config_info;
|
|
usart_config_t usart_config;
|
|
u32_t clock_freq;
|
|
|
|
clock_freq = CLOCK_GetFlexCommClkFreq(config->clock_source);
|
|
|
|
USART_GetDefaultConfig(&usart_config);
|
|
usart_config.enableTx = true;
|
|
usart_config.enableRx = true;
|
|
usart_config.baudRate_Bps = config->baud_rate;
|
|
|
|
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 mcux_flexcomm_driver_api = {
|
|
.poll_in = mcux_flexcomm_poll_in,
|
|
.poll_out = mcux_flexcomm_poll_out,
|
|
.err_check = mcux_flexcomm_err_check,
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.fifo_fill = mcux_flexcomm_fifo_fill,
|
|
.fifo_read = mcux_flexcomm_fifo_read,
|
|
.irq_tx_enable = mcux_flexcomm_irq_tx_enable,
|
|
.irq_tx_disable = mcux_flexcomm_irq_tx_disable,
|
|
.irq_tx_complete = mcux_flexcomm_irq_tx_complete,
|
|
.irq_tx_ready = mcux_flexcomm_irq_tx_ready,
|
|
.irq_rx_enable = mcux_flexcomm_irq_rx_enable,
|
|
.irq_rx_disable = mcux_flexcomm_irq_rx_disable,
|
|
.irq_rx_ready = mcux_flexcomm_irq_rx_ready,
|
|
.irq_err_enable = mcux_flexcomm_irq_err_enable,
|
|
.irq_err_disable = mcux_flexcomm_irq_err_disable,
|
|
.irq_is_pending = mcux_flexcomm_irq_is_pending,
|
|
.irq_update = mcux_flexcomm_irq_update,
|
|
.irq_callback_set = mcux_flexcomm_irq_callback_set,
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_UART_MCUX_FLEXCOMM_0
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void mcux_flexcomm_config_func_0(struct device *dev);
|
|
#endif
|
|
|
|
static const struct mcux_flexcomm_config mcux_flexcomm_0_config = {
|
|
.base = (USART_Type *)DT_NXP_LPC_USART_USART_0_BASE_ADDRESS,
|
|
.clock_source = 0,
|
|
.baud_rate = DT_NXP_LPC_USART_USART_0_CURRENT_SPEED,
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
.irq_config_func = mcux_flexcomm_config_func_0,
|
|
#endif
|
|
};
|
|
|
|
static struct mcux_flexcomm_data mcux_flexcomm_0_data;
|
|
|
|
DEVICE_AND_API_INIT(usart_0, DT_NXP_LPC_USART_USART_0_LABEL,
|
|
&mcux_flexcomm_init,
|
|
&mcux_flexcomm_0_data, &mcux_flexcomm_0_config,
|
|
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
|
|
&mcux_flexcomm_driver_api);
|
|
|
|
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
|
|
static void mcux_flexcomm_config_func_0(struct device *dev)
|
|
{
|
|
IRQ_CONNECT(DT_NXP_LPC_USART_USART_0_IRQ_0,
|
|
DT_NXP_LPC_USART_USART_0_IRQ_0_PRIORITY,
|
|
mcux_flexcomm_isr, DEVICE_GET(usart_0), 0);
|
|
|
|
irq_enable(DT_NXP_LPC_USART_USART_0_IRQ_0);
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_UART_MCUX_FLEXCOMM_0 */
|