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drivers: serial: uart_mcux_lpuart: Add configure functions

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This enables support for the confgure and config_get functions in
the UART API, allowing users to change baudrate, parity, stop bits,
data bits and flow control in runtime.

Signed-off-by: Jesper Derander <jesper.derander@endian.se>
This commit is contained in:
Jesper Derander 2020-08-13 15:38:07 +02:00 • committed by Maureen Helm
commit 5b80d4eac8
1 changed files with 115 additions and 3 deletions
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118
drivers/serial/uart_mcux_lpuart.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2017, NXP
* Copyright (c) 2020 Softube
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -28,6 +29,7 @@ struct mcux_lpuart_data {
uart_irq_callback_user_data_t callback;
void *cb_data;
#endif
struct uart_config uart_config;
};
static int mcux_lpuart_poll_in(const struct device *dev, unsigned char *c)
@ -232,10 +234,11 @@ static void mcux_lpuart_isr(const struct device *dev)
}
#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
static int mcux_lpuart_init(const struct device *dev)
static int mcux_lpuart_configure_init(const struct device *dev,
const struct uart_config *cfg)
{
const struct mcux_lpuart_config *config = dev->config;
lpuart_config_t uart_config;
struct mcux_lpuart_data *data = dev->data;
const struct device *clock_dev;
uint32_t clock_freq;
@ -249,13 +252,120 @@ static int mcux_lpuart_init(const struct device *dev)
return -EINVAL;
}
lpuart_config_t uart_config;
LPUART_GetDefaultConfig(&uart_config);
/* Translate UART API enum to LPUART enum from HAL */
switch (cfg->parity) {
case UART_CFG_PARITY_NONE:
uart_config.parityMode = kLPUART_ParityDisabled;
break;
case UART_CFG_PARITY_ODD:
uart_config.parityMode = kLPUART_ParityOdd;
break;
case UART_CFG_PARITY_EVEN:
uart_config.parityMode = kLPUART_ParityEven;
break;
default:
return -ENOTSUP;
}
switch (cfg->data_bits) {
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && \
FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
case UART_CFG_DATA_BITS_7:
uart_config.dataBitsCount = kLPUART_SevenDataBits;
break;
#endif
case UART_CFG_DATA_BITS_8:
uart_config.dataBitsCount = kLPUART_EightDataBits;
break;
default:
return -ENOTSUP;
}
#if defined(FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT) && \
FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT
switch (cfg->stop_bits) {
case UART_CFG_STOP_BITS_1:
uart_config.stopBitCount = kLPUART_OneStopBit;
break;
case UART_CFG_STOP_BITS_2:
uart_config.stopBitCount = kLPUART_TwoStopBit;
break;
default:
return -ENOTSUP;
}
#endif
#if defined(FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT) && \
FSL_FEATURE_LPUART_HAS_MODEM_SUPPORT
switch (cfg->flow_ctrl) {
case UART_CFG_FLOW_CTRL_NONE:
uart_config.enableTxCTS = false;
uart_config.enableRxRTS = false;
break;
case UART_CFG_FLOW_CTRL_RTS_CTS:
uart_config.enableTxCTS = true;
uart_config.enableRxRTS = true;
break;
default:
return -ENOTSUP;
}
#endif
uart_config.baudRate_Bps = cfg->baudrate;
uart_config.enableTx = true;
uart_config.enableRx = true;
uart_config.baudRate_Bps = config->baud_rate;
LPUART_Init(config->base, &uart_config, clock_freq);
/* update internal uart_config */
data->uart_config = *cfg;
return 0;
}
static int mcux_lpuart_config_get(const struct device *dev, struct uart_config *cfg)
{
struct mcux_lpuart_data *data = dev->data;
*cfg = data->uart_config;
return 0;
}
static int mcux_lpuart_configure(const struct device *dev,
const struct uart_config *cfg)
{
const struct mcux_lpuart_config *config = dev->config;
/* disable LPUART */
LPUART_Deinit(config->base);
int ret = mcux_lpuart_configure_init(dev, cfg);
if (ret) {
return ret;
}
/* wait for hardware init */
k_sleep(K_MSEC(1));
return 0;
}
static int mcux_lpuart_init(const struct device *dev)
{
const struct mcux_lpuart_config *config = dev->config;
struct mcux_lpuart_data *data = dev->data;
struct uart_config *uart_api_config = &data->uart_config;
uart_api_config->baudrate = config->baud_rate;
uart_api_config->parity = UART_CFG_PARITY_NONE;
uart_api_config->stop_bits = UART_CFG_STOP_BITS_1;
uart_api_config->data_bits = UART_CFG_DATA_BITS_8;
uart_api_config->flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
/* set initial configuration */
mcux_lpuart_configure_init(dev, uart_api_config);
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
config->irq_config_func(dev);
#endif
@ -267,6 +377,8 @@ static const struct uart_driver_api mcux_lpuart_driver_api = {
.poll_in = mcux_lpuart_poll_in,
.poll_out = mcux_lpuart_poll_out,
.err_check = mcux_lpuart_err_check,
.configure = mcux_lpuart_configure,
.config_get = mcux_lpuart_config_get,
#ifdef CONFIG_UART_INTERRUPT_DRIVEN
.fifo_fill = mcux_lpuart_fifo_fill,
.fifo_read = mcux_lpuart_fifo_read,