我正在尝试通过输入 UART 事件处理程序捕获输入数字,并使用该数字的一些乘法将其打印回来。它可以很好地打印字符串,但是在打印之后程序不再对任何输入做出反应。可以打印 alfabet 或显示错误消息,但是当我使用 printf 函数时,终端停止响应输入并且光标位于下一行的中途。
这是C代码:
#include "mss_uart.h"
#include <stdio.h>
#define RX_BUFF_SIZE 64
#define MSS_UART_57600_BAUD 57600
uint8_t g_rx_buff[RX_BUFF_SIZE];
uint8_t g_rx_idx;
void uart0_rx_handler( mss_uart_instance_t * this_uart )
{
MSS_UART_get_rx( &g_mss_uart0, &g_rx_buff[g_rx_idx], sizeof(g_rx_buff) );
if(g_rx_buff[g_rx_idx] > 96 && g_rx_buff[g_rx_idx] < 123)
{
uint8_t message[55] = "De letter was: x, de uppercase letter van : x is y.\n\r";
message[15] = g_rx_buff[g_rx_idx];
message[44] = g_rx_buff[g_rx_idx];
message[49] = g_rx_buff[g_rx_idx] - 32;
MSS_UART_polled_tx( &g_mss_uart0, message, sizeof(message) );
}
else if(g_rx_buff[g_rx_idx] > 64 && g_rx_buff[g_rx_idx] < 91)
{
uint8_t message[55] = "De letter was: x, de lowercase letter van : x is y.\n\r";
message[15] = g_rx_buff[g_rx_idx];
message[44] = g_rx_buff[g_rx_idx];
message[49] = g_rx_buff[g_rx_idx] + 32;
MSS_UART_polled_tx( &g_mss_uart0, message, sizeof(message) );
}
else if(g_rx_buff[g_rx_idx] > 47 && g_rx_buff[g_rx_idx] < 58)
{
int number = g_rx_buff[g_rx_idx] - '0';
int number2 = number * number;
int number3 = number2 * number;
int number4 = number3 * number;
printf("Getallenreeks: %d, %d, %d, %d.\n\r", number, number2, number3, number4);
}
else
{
uint8_t message[10] = "Error.\n\r";
MSS_UART_polled_tx( &g_mss_uart0, message, sizeof(message) );
}
}
int main(void)
{
MSS_UART_init
(
&g_mss_uart0,
MSS_UART_57600_BAUD,
MSS_UART_DATA_8_BITS | MSS_UART_NO_PARITY | MSS_UART_ONE_STOP_BIT
);
MSS_UART_set_rx_handler( &g_mss_uart0, uart0_rx_handler, MSS_UART_FIFO_SINGLE_BYTE );
while ( 1 )
{}
return(0);
}
void uart0_rx_handler是中断处理程序,MSS_UART_get_rx将输入放入 g_rx_buff[g_rx_idx]。
我尝试使用与字符相同的MSS_UART_polled_tx函数打印数字,但没有运气。它打印错误的 ascii 值:
if(g_rx_buff[g_rx_idx] > 47 && g_rx_buff[g_rx_idx] < 58)
{
int number = g_rx_buff[g_rx_idx] - '0';
int number2 = number * number;
int number3 = number2 * number;
int number4 = number3 * number;
uint8_t message[15] = "Getallenreeks: ";
uint8_t komma[2] = ", ";
uint8_t end[5] = ".\n\r";
char numberstring2[2];
char numberstring3[3];
char numberstring4[4];
sprintf(numberstring2, "%d", number2);
sprintf(numberstring3, "%d", number3);
sprintf(numberstring4, "%d", number4);
uint8_t messagenumber[1];
uint8_t messagenumber2[1];
uint8_t messagenumber3[1];
uint8_t messagenumber4[1];
messagenumber[0] = '0' + number;
messagenumber2[0] = '0' + number2;
messagenumber3[0] = '0' + number3;
messagenumber4[0] = '0' + number4;
http://imageshack.us/photo/my-images/843/testlan.jpg/( &g_mss_uart0, message, sizeof(message) );
MSS_UART_polled_tx( &g_mss_uart0, messagegetal, sizeof(messagenumber) );
MSS_UART_polled_tx( &g_mss_uart0, komma, sizeof(komma) );
MSS_UART_polled_tx( &g_mss_uart0, messagegetal2, sizeof(messagenumber2) );
MSS_UART_polled_tx( &g_mss_uart0, komma, sizeof(komma) );
MSS_UART_polled_tx( &g_mss_uart0, messagegetal3, sizeof(messagenumber3) );
MSS_UART_polled_tx( &g_mss_uart0, komma, sizeof(komma) );
MSS_UART_polled_tx( &g_mss_uart0, messagegetal4, sizeof(messagenumber4) );
MSS_UART_polled_tx( &g_mss_uart0, end, sizeof(end) );
}
代码输出示例: http: //imageshack.us/photo/my-images/843/testlan.jpg/ 左侧终端显示使用printf函数,右侧终端显示使用MSS_UART_polled_tx函数处理数字(如第二个代码块所示) )。