Hi,
Although I have posted tty utils before it may not be simple enough to be used.
以前に tty utils をポストしてはいたのですが、簡潔さが不充分と感じたため
Re: tty_utils a utility sample for CLI type program
So I posted a line read sample for PSoC 5LP.
昨夜、UART からの 1行読み込みのサンプルを PSoC 5LP 用に書いてポストしました。
PSoC 5LP Simple Samples for Uart input in char array save
And here is a version for PSoC 4.
で、折角なので PSoC 4 版も作成してみました。
The followings are a version using polling and a version using interrupt.
以下、ポーリング版と割込み利用版です。
(1) Polling Version / ポーリング版
schematic
pins
Tera Term log
main.c
=====================
#include "project.h"
#include "stdio.h"
#define CR '\r'
#define NL '\n'
#define BS '\b'
#define RX_BUF_LEN 64
char rx_buf[RX_BUF_LEN+1] ; /* 1byte for NULL */
void print(char *str)
{
UART_UartPutString(str) ;
}
void printc(char c)
{
UART_UartPutChar(c) ;
}
int line_received = 0 ;
int rx_index = 0 ;
int get_line(void)
{
uint8_t c ;
while((line_received == 0) && (UART_SpiUartGetRxBufferSize() > 0)) {
c = UART_UartGetByte() ;
switch(c) {
case 0x00:
case 0xFF:
break ;
case BS: /* backspace */
if (rx_index > 1) {
rx_index-- ;
rx_buf[rx_index] = 0 ;
print("\b \b") ;
}
break ;
case NL:
case CR:
printc(c) ;
rx_buf[rx_index] = 0 ;
rx_index = 0 ;
line_received = 1 ;
break ;
default:
printc(c) ;
rx_buf[rx_index] = c ;
rx_index++ ;
if (rx_index >= RX_BUF_LEN) { /* buffer overflow */
rx_buf[RX_BUF_LEN] = 0 ; /* terminate the string */
line_received = -1 ; /* not 0 but not 1 as this is error */
rx_index = 0 ;
}
}
}
return(line_received) ;
}
void prompt(void)
{
print("> ") ;
}
int main(void)
{
CyGlobalIntEnable; /* Enable global interrupts. */
UART_Start() ;
print("\x1b[2J\x1b[;H") ; /* clear screen */
print("UART polling test ") ;
snprintf(rx_buf, RX_BUF_LEN, "(%s %s)\n", __DATE__, __TIME__) ;
print(rx_buf) ;
prompt() ;
for(;;)
{
if (get_line()) {
print("Line: ") ;
print(rx_buf) ;
print("\n") ;
line_received = 0 ;
prompt() ;
}
}
}
=====================
(2) Interrupt version / 割込み使用版
schematic
pins
Tera Term log
main.c
==================
#include "project.h"
#include "stdio.h"
#define CR '\r'
#define NL '\n'
#define BS '\b'
#define RX_BUF_LEN 64
volatile char rx_buf[RX_BUF_LEN] ;
#define STR_LEN 32
char str[STR_LEN+1] ; /* 1 byte for NULL */
void print(char *str)
{
UART_UartPutString(str) ;
while(UART_SpiUartGetTxBufferSize() > 0) ;
}
void printc(char c)
{
UART_UartPutChar(c) ;
}
volatile int line_received = 0 ;
volatile int rx_write_index = 0 ;
int rx_read_index = 0 ;
int str_index = 0 ;
CY_ISR(uart_isr)
{
uint32_t status ;
uint8_t c ;
status = UART_GetRxInterruptSource() ;
if (status & UART_INTR_RX_NOT_EMPTY){
c = UART_UartGetByte() ;
if ((c != 0x00) && (c != 0xFF)) {
rx_buf[rx_write_index] = c ;
rx_write_index = (rx_write_index + 1) % RX_BUF_LEN ;
}
}
UART_ClearRxInterruptSource(status) ;
}
int get_line(void)
{
uint8_t c ;
while((line_received == 0)&&(rx_read_index != rx_write_index)) {
c = rx_buf[rx_read_index] ;
switch(c) {
case 0x00:
case 0xFF:
break ;
case BS: /* backspace */
if (str_index > 0) {
str_index-- ;
str[str_index] = 0 ;
print("\b \b") ;
}
break ;
case NL:
case CR:
printc(c) ;
str[str_index] = 0 ;
str_index = 0 ;
line_received = 1 ;
break ;
default:
printc(c) ;
str[str_index] = c ;
str_index++ ;
if (str_index >= STR_LEN) { /* buffer overflow */
str[STR_LEN] = 0 ; /* terminate the string */
line_received = -1 ; /* not 0 but not 1 as this is error */
str_index = 0 ;
}
}
rx_read_index = (rx_read_index + 1) % RX_BUF_LEN ;
}
return(line_received) ;
}
void prompt(void)
{
print("> ") ;
}
int main(void)
{
CyGlobalIntEnable; /* Enable global interrupts. */
tty_rx_int_ClearPending() ;
tty_rx_int_StartEx(uart_isr) ;
UART_Start() ;
print("\x1b[2J\x1b[;H") ; /* clear screen */
print("UART interrupt test ") ;
snprintf(str, STR_LEN, "(%s %s)\n", __DATE__, __TIME__) ;
print(str) ;
prompt() ;
for(;;)
{
if (get_line()) {
print("Line: ") ;
print(str) ;
print("\n") ;
line_received = 0 ;
prompt() ;
}
}
}
==================
26-Jun-2020
moto
