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drivers: serial: gd32 usart parity bit config

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Initialize parity bit(Default NONE) from DTS.

Signed-off-by: HaiLong Yang <cameledyang@pm.me>
This commit is contained in:
HaiLong Yang 2021-11-08 11:08:22 +08:00 • committed by Anas Nashif
commit 9418a4f763
1 changed files with 30 additions and 3 deletions
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33
drivers/serial/usart_gd32.c
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@ -5,6 +5,7 @@
#define DT_DRV_COMPAT gd_gd32_usart
#include <errno.h>
#include <drivers/pinctrl.h>
#include <drivers/uart.h>
@ -12,6 +13,7 @@ struct gd32_usart_config {
uint32_t reg;
uint32_t rcu_periph_clock;
const struct pinctrl_dev_config *pcfg;
uint32_t parity;
};
struct gd32_usart_data {
@ -22,6 +24,8 @@ static int usart_gd32_init(const struct device *dev)
{
const struct gd32_usart_config *const cfg = dev->config;
struct gd32_usart_data *const data = dev->data;
uint32_t word_length;
uint32_t parity;
int ret;
ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
@ -29,13 +33,34 @@ static int usart_gd32_init(const struct device *dev)
return ret;
}
/**
* In order to keep the transfer data size to 8 bits(1 byte),
* append word length to 9BIT if parity bit enabled.
*/
switch (cfg->parity) {
case UART_CFG_PARITY_NONE:
parity = USART_PM_NONE;
word_length = USART_WL_8BIT;
break;
case UART_CFG_PARITY_ODD:
parity = USART_PM_ODD;
word_length = USART_WL_9BIT;
break;
case UART_CFG_PARITY_EVEN:
parity = USART_PM_EVEN;
word_length = USART_WL_9BIT;
break;
default:
return -ENOTSUP;
}
rcu_periph_clock_enable(cfg->rcu_periph_clock);
usart_deinit(cfg->reg);
usart_baudrate_set(cfg->reg, data->baud_rate);
usart_word_length_set(cfg->reg, USART_WL_8BIT);
usart_parity_config(cfg->reg, USART_PM_NONE);
usart_parity_config(cfg->reg, parity);
usart_word_length_set(cfg->reg, word_length);
/* Default to 1 stop bit */
usart_stop_bit_set(cfg->reg, USART_STB_1BIT);
usart_parity_config(cfg->reg, USART_PM_NONE);
usart_receive_config(cfg->reg, USART_RECEIVE_ENABLE);
usart_transmit_config(cfg->reg, USART_TRANSMIT_ENABLE);
usart_enable(cfg->reg);
@ -114,6 +139,8 @@ static const struct uart_driver_api usart_gd32_driver_api = {
.reg = DT_INST_REG_ADDR(n), \
.rcu_periph_clock = DT_INST_PROP(n, rcu_periph_clock), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.parity = DT_ENUM_IDX_OR(DT_DRV_INST(n), parity, \
UART_CFG_PARITY_NONE), \
}; \
DEVICE_DT_INST_DEFINE(n, &usart_gd32_init, \
NULL, \