【雅特力AT32WB415系列蓝牙BLE 5.0 MCU测评】4.0 串口通信 Printf测试
<div class='showpostmsg'><p style="text-align: center;"><span style="font-size:20px;">串口通信 Printf测试</span></p><p><span style="font-size:18px;">一、板载通信资源</span></p>
<p><span style="font-size:18px;"> </span><span style="font-size:16px;"> 雅特力AT32WB415开发板具有较为丰富通信外设资源：有3路串口通信接口，IIC，SPI，CAN，USB2.0等诸多接口。</span></p>
<p><span style="font-size:16px;"> </span><span style="font-size:18px;">二、程序分析</span></p>
<p><span style="font-size:18px;"> </span><span style="font-size:16px;">1、串口初始化</span></p>
<p><span style="font-size:16px;"> 该部分代码原理和ST差不多，学习过ST的库函数开发者基本都能理解</span></p>
<p><span style="font-size:16px;"> </span></p>
<pre>
<code class="language-cpp">void uart_print_init(uint32_t baudrate)
{
gpio_init_type gpio_init_struct;
/* enable the uart and gpio clock */
crm_periph_clock_enable(PRINT_UART_CRM_CLK, TRUE);
crm_periph_clock_enable(PRINT_UART_TX_GPIO_CRM_CLK, TRUE);
gpio_default_para_init(&gpio_init_struct);
/* configure the uart tx pin */
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_init_struct.gpio_out_type= GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
gpio_init_struct.gpio_pins = PRINT_UART_TX_PIN;
gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
gpio_init(PRINT_UART_TX_GPIO, &gpio_init_struct);
/* configure uart param */
usart_init(PRINT_UART, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);
usart_transmitter_enable(PRINT_UART, TRUE);
usart_enable(PRINT_UART, TRUE);
}</code></pre>
<p> <span style="font-size:16px;">2、Printf重定向函数</span></p>
<pre>
<code class="language-cpp">/* support printf function, usemicrolib is unnecessary */
#if (__ARMCC_VERSION > 6000000)
__asm (".global __use_no_semihosting\n\t");
void _sys_exit(int x)
{
x = x;
}
/* __use_no_semihosting was requested, but _ttywrch was */
void _ttywrch(int ch)
{
ch = ch;
}
FILE __stdout;
#else
#ifdef __CC_ARM
#pragma import(__use_no_semihosting)
struct __FILE
{
int handle;
};
FILE __stdout;
void _sys_exit(int x)
{
x = x;
}
/* __use_no_semihosting was requested, but _ttywrch was */
void _ttywrch(int ch)
{
ch = ch;
}
#endif
#endif</code></pre>
<p> <span style="font-size:16px;">记得要添加stdio.h的头文件，不然程序会出现报错</span>，最后记得勾选<span style="font-size:16px;">上这个，不然将无法通信</span></p>
<p><span style="font-size:16px;"> </span></p>
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<p>不错不错 刚好要这个</p>
<p>看起来挺容易的 不知道调试时会不会出错</p>
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