UART - 通用异步收发传输器
Universal Asynchronous Receiver/Transmitter,通用异步收发传输器
- Compatible with industry-standard 16450/16550 UARTs
- 64-Byte Transmit and receive data FIFOs
- Supports DMA controller interface
- Supports Software/ Hardware Flow Control
- Supports IrDA 1.0 SIR
- Supports RS-485 mode
模块配置
其menuconfig 的配置如下:
Kernel Setup --->
    Drivers Setup --->
        SoC HAL Drivers --->
            UART devices --->
                [*] enable uart driver
                [*] enbale uart hal APIs Test command
源码结构
.
│  hal_uart.c         # 驱动源码
│  platform-uart.h    # 平台选择头文件
│  uart.h             # 驱动私有头文件
└─platform
        uart-sun20iw2p1.h # 平台特化定义
模块接口说明
头文件
#include <hal_uart.h>
返回值枚举
typedef enum
{
    HAL_UART_STATUS_ERROR_PARAMETER = -4,      /**< Invalid user input parameter. */
    HAL_UART_STATUS_ERROR_BUSY = -3,           /**< UART port is currently in use. */
    HAL_UART_STATUS_ERROR_UNINITIALIZED = -2,  /**< UART port has not been initialized. */
    HAL_UART_STATUS_ERROR = -1,                /**< UART driver detected a common error. */
    HAL_UART_STATUS_OK = 0                     /**< UART function executed successfully. */
} hal_uart_status_t;
波特率枚举
typedef enum
{
    UART_BAUDRATE_300 = 0,
    UART_BAUDRATE_600,
    UART_BAUDRATE_1200,
    UART_BAUDRATE_2400,
    UART_BAUDRATE_4800,
    UART_BAUDRATE_9600,
    UART_BAUDRATE_19200,
    UART_BAUDRATE_38400,
    UART_BAUDRATE_57600,
    UART_BAUDRATE_115200,
    UART_BAUDRATE_230400,
    UART_BAUDRATE_576000,
    UART_BAUDRATE_921600,
    UART_BAUDRATE_1000000,
    UART_BAUDRATE_1500000,
    UART_BAUDRATE_3000000,
    UART_BAUDRATE_4000000,
    UART_BAUDRATE_MAX,
} uart_baudrate_t;
UART 字长枚举
typedef enum
{
    UART_WORD_LENGTH_5 = 0,
    UART_WORD_LENGTH_6,
    UART_WORD_LENGTH_7,
    UART_WORD_LENGTH_8,
} uart_word_length_t;
UART 停止位枚举
typedef enum
{
    UART_STOP_BIT_1 = 0,
    UART_STOP_BIT_2,
} uart_stop_bit_t;
UART 奇偶枚举
typedef enum
{
    UART_PARITY_NONE = 0,
    UART_PARITY_ODD,
    UART_PARITY_EVEN
} uart_parity_t;
UART 配置结构体
typedef struct
{
    uart_baudrate_t baudrate;
    uart_word_length_t word_length;
    uart_stop_bit_t stop_bit;
    uart_parity_t parity;
} _uart_config_t;
获取UART驱动的版本号
函数 原型:
sunxi_hal_version_t hal_uart_get_version(int32_t dev)
参数:
- dev:UART端口号
返回:
- UART 驱动版本号
初始化UART驱动
函数原型:
int32_t hal_uart_init(int32_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 0:成功
- 负数:失败
初始化异构AMP UART控制台
函数原型:
int32_t hal_uart_init_for_amp_cli(int32_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 0:成功
- 负数:失败
卸载UART驱动
函数原型:
int32_t hal_uart_deinit(int32_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 0:成功
- 负数:失败
发送数据
函数原型:
int32_t hal_uart_send(int32_t dev, const uint8_t *data, uint32_t num);
参数:
- dev:UART 端口号
- data:准备发送的数据buffer
- num:buffer 大小
返回:
- 成功发送的字节数
发送一个字符
函数原型:
int32_t hal_uart_put_char(int32_t dev, char c);
参数:
- dev:UART 端口号
- c:待发送的字符
返回:
- 1:成功
接收数据
函数原型:
int32_t hal_uart_receive(int32_t dev, uint8_t *data, uint32_t num);
参数:
- dev:UART 端口号
- data:接收数据缓冲区
- num:接收数据的大小
返回:
- size:接收到的数据大小
非阻塞接收数据
函数原型:
int32_t hal_uart_receive_no_block(int32_t dev, uint8_t *data, uint32_t num, int32_t timeout);
参数:
- dev:UART 端口号
- data:接收数据缓冲区
- num:接收数据的大小
- timeout:超时时间
返回:
- size:接收到的数据大小
接收一个字符
函数原型:
uint8_t hal_uart_get_char(int32_t dev);
参数:
- dev:UART 端口号
返回:
- 收到的字符值
设置 UART 工作参数
函数原型:
int32_t hal_uart_control(int32_t uart_port, int cmd, void *args);
参数:
- uart_port:UART 端口号
- cmd:保留
- args: 指向 _uart_config_t 类型的结构体
返回:
- 0:成功
- 负数:失败
轮询接收
函数原型:
int32_t hal_uart_receive_polling(int32_t dev, uint8_t *data, uint32_t num);
参数:
- dev:UART 端口号
- data:接收数据缓冲区
- num:接收数据的大小
返回:
- size:接收到的数据大小
查看轮询接收状态
函数原型:
int32_t hal_uart_check_poll_state(int32_t dev_id, short key);
参数:
- dev_id:UART 端口号
- key:标志位,取值 POLLIN,POLLOUT,POLLERR
返回:
- UART 当前的接收状态
执行唤醒处理函数
函数原型:
int32_t hal_uart_poll_wakeup(int32_t dev_id, short key);
参数:
- dev_id:UART 端口号
- key:标志位,取值 POLLIN,POLLOUT,POLLERR
返回:
- 回调函数执行返回值
注册唤醒处理函数
函数原型:
int32_t hal_uart_register_poll_wakeup(poll_wakeup_func poll_wakeup);
参数:
- poll_wakeup:回调函数
返回:
- 0
设置硬件流控
函数原型:
void hal_uart_set_hardware_flowcontrol(uart_port_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 无
禁用硬件流控
函数原型:
void hal_uart_disable_flowcontrol(uart_port_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 无
设置 UART 回环
函数原型:
void hal_uart_set_loopback(uart_port_t uart_port, bool enable);
参数:
- uart_port:UART 端口号
- enable:是否开启
返回:
- 无
使能 RX 中断
函数原型:
int32_t hal_uart_enable_rx(int32_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 0
失能 RX 中断
函数原型:
int32_t hal_uart_disable_rx(int32_t uart_port);
参数:
- uart_port:UART 端口号
返回:
- 0
模块使用范例
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <hal_log.h>
#include <hal_cmd.h>
#include <hal_timer.h>
#include <hal_uart.h>
static void cmd_usage(void)
{
	printf("Usage:\n"
		"\t hal_uart <port> <baudrate>\n");
}
int cmd_test_uart(int argc, char **argv)
{
	uint8_t tbuf[6] = {"hello"};
	uint8_t rbuf[10] = {0};
	uart_port_t port;
	uint32_t baudrate;
	_uart_config_t uart_config;
	int i;
	hal_log_info("Testing UART in loopback mode");
	if (argc != 3) {
		cmd_usage();
		return -1;
	}
	port = strtol(argv[1], NULL, 0);
	baudrate = strtol(argv[2], NULL, 0);
	if(CONFIG_CLI_UART_PORT == port){
		hal_log_info("uart0 can't test, please use other port!");
		return -1;
	}
	memset(rbuf, 0, 10 * sizeof(uint8_t));
	switch (baudrate) {
	case 4800:
		uart_config.baudrate = UART_BAUDRATE_4800;
		break;
	case 9600:
		uart_config.baudrate = UART_BAUDRATE_9600;
		break;
	case 115200:
		uart_config.baudrate = UART_BAUDRATE_115200;
		break;
	case 1500000:
		uart_config.baudrate = UART_BAUDRATE_1500000;
		break;
	case 4000000:
		uart_config.baudrate = UART_BAUDRATE_4000000;
		break;
	default:
		hal_log_info("Using default baudrate: 115200");
		uart_config.baudrate = UART_BAUDRATE_115200;
		break;
	}
	uart_config.word_length = UART_WORD_LENGTH_8;
	uart_config.stop_bit = UART_STOP_BIT_1;
	uart_config.parity = UART_PARITY_NONE;
	hal_uart_init(port);
	hal_uart_control(port, 0, &uart_config);
	hal_uart_disable_flowcontrol(port);
	hal_uart_set_loopback(port, 1);
	/* send */
	hal_uart_send(port, tbuf, 5);
	/* loopback receive */
	hal_uart_receive_no_block(port, rbuf, 5, MS_TO_OSTICK(1000));
	printf("Sending:");
	for (i = 0; i < 5; i++)
		printf("%c", tbuf[i]);
	printf("\n");
	printf("Receiving:");
	for (i = 0; i < 5; i++)
		printf("%c", rbuf[i]);
	printf("\n");
	/* verify data */
	for (i = 0; i < 5; i++) {
		if (tbuf[i] != rbuf[i])
			break;
	}
	if (i == 5) {
		hal_log_info("Test hal_uart_init API success!");
		hal_log_info("Test hal_uart_control API success!");
		hal_log_info("Test hal_uart_disable_flowcontrol API success!");
		hal_log_info("Test hal_uart_set_loopback API success!");
		hal_log_info("Test hal_uart_send API success!");
		hal_log_info("Test hal_uart_receive API success!");
		hal_log_info("Test hal_uart_deinit API success!");
		hal_log_info("Test uart hal APIs success!");
	} else {
		hal_log_info("Test uart hal APIs failed!");
	}
	hal_msleep(1000);
	hal_uart_deinit(port);
	return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_test_uart, hal_uart, uart hal APIs tests)
#define BUFFSIZE 4096
static void cmd_stress_usage(void)
{
	printf("Usage:\n"
		"\t hal_uart <port> <baudrate> <flowctrl> <loopback> <len>\n");
}
int cmd_test_uart_stress(int argc, char **argv)
{
	uint8_t *tbuf = malloc(BUFFSIZE);
	uint8_t *rbuf = malloc(BUFFSIZE);
	uart_port_t port;
	uint32_t baudrate;
	_uart_config_t uart_config;
	int i;
	int flowctrl, loopback, testlen;
	hal_log_info("Testing UART in loopback mode with stress");
	if (argc != 6) {
		cmd_stress_usage();
		free(tbuf);
		free(rbuf);
		return -1;
	}
	port = strtol(argv[1], NULL, 0);
	baudrate = strtol(argv[2], NULL, 0);
	flowctrl = strtol(argv[3], NULL, 0);
	loopback = strtol(argv[4], NULL, 0);
	testlen = strtol(argv[5], NULL, 0);
	for (i = 0; i < BUFFSIZE; i++) {
		tbuf[i] = ('a' + i) & 0xff;
	}
	memset(rbuf, 0, BUFFSIZE * sizeof(uint8_t));
	switch (baudrate) {
	case 4800:
		uart_config.baudrate = UART_BAUDRATE_4800;
		break;
	case 9600:
		uart_config.baudrate = UART_BAUDRATE_9600;
		break;
	case 115200:
		uart_config.baudrate = UART_BAUDRATE_115200;
		break;
	case 1500000:
		uart_config.baudrate = UART_BAUDRATE_1500000;
		break;
	default:
		hal_log_info("Using default baudrate: 115200");
		uart_config.baudrate = UART_BAUDRATE_115200;
		break;
	}
	uart_config.word_length = UART_WORD_LENGTH_8;
	uart_config.stop_bit = UART_STOP_BIT_1;
	uart_config.parity = UART_PARITY_NONE;
	hal_uart_init(port);
	hal_uart_control(port, 0, &uart_config);
	printf("flow:%d, loopback:%d len:%d\n", flowctrl, loopback, testlen);
	if (flowctrl)
		hal_uart_set_hardware_flowcontrol(port);
	else
		hal_uart_disable_flowcontrol(port);
	if (loopback)
		hal_uart_set_loopback(port, 1);
	else
		hal_uart_set_loopback(port, 0);
	/* send */
	printf("send\n");
	hal_uart_send(port, tbuf, testlen);
	printf("send done\n");
	printf("recv\n");
	/* loopback receive */
	hal_uart_receive(port, rbuf, testlen);
	printf("recv done\n");
#if 0
	printf("Sending:");
	for (i = 0; i < testlen; i++) {
		if (i % 16 == 0)
			printf("\n");
		printf("0x%x ", tbuf[i]);
	}
	printf("\n");
	printf("Receiving:");
	for (i = 0; i < testlen; i++) {
		if (i % 16 == 0)
			printf("\n");
		printf("0x%x ", rbuf[i]);
	}
	printf("\n");
#endif
	/* verify data */
	for (i = 0; i < testlen; i++) {
		if (tbuf[i] != rbuf[i]) {
			printf("check %d fail, 0x%x != 0x%x\n", i, tbuf[i], rbuf[i]);
			break;
		}
	}
	if (i == testlen) {
		hal_log_info("Test hal_uart_init API success!");
		hal_log_info("Test hal_uart_control API success!");
		hal_log_info("Test hal_uart_disable_flowcontrol API success!");
		hal_log_info("Test hal_uart_set_loopback API success!");
		hal_log_info("Test hal_uart_send API success!");
		hal_log_info("Test hal_uart_receive API success!");
		hal_log_info("Test hal_uart_deinit API success!");
		hal_log_info("Test uart hal APIs success!");
	} else {
		hal_log_info("Test uart hal APIs failed!");
	}
	hal_msleep(1000);
	hal_uart_deinit(port);
	free(tbuf);
	free(rbuf);
	return 0;
}
FINSH_FUNCTION_EXPORT_CMD(cmd_test_uart_stress, hal_uart_stress, uart hal APIs tests)