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example code now also uses USB CDC ACM

This commit is contained in:
King Kévin 2016-01-18 16:23:35 +01:00
parent 4a149d6a80
commit 2eff94979e
2 changed files with 16 additions and 5 deletions
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19
main.c
View File

@ -25,10 +25,12 @@
#include <libopencm3/stm32/rcc.h> // real-time control clock library
#include <libopencm3/stm32/gpio.h> // general purpose input output library
#include <libopencm3/cm3/scb.h> // vector table definition
#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
/* own libraries */
#include "main.h" // board definitions
#include "usart.h" // USART utilities
#include "usb_cdcacm.h" // USB CDC ACM utilities
/* default output (i.e. for printf) */
int _write(int file, char *ptr, int len)
@ -39,8 +41,10 @@ int _write(int file, char *ptr, int len)
for (i = 0; i < len; i++) {
if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
cdcacm_putchar('\r'); // a second line feed doesn't break the display
}
usart_putchar_nonblocking(ptr[i]); // send byte over USART
cdcacm_putchar(ptr[i]); // send byte over USB
}
return i;
}
@ -56,8 +60,7 @@ static void clock_setup(void)
static void gpio_setup(void)
{
/* set LED pin to 'output push-pull' */
gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN);
gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
}
int main(void)
@ -67,16 +70,24 @@ int main(void)
clock_setup(); // setup main clock
gpio_setup(); // setup main inputs/ouputs
usart_setup(); // setup USART (for printing)
cdcacm_setup(); // setup USB CDC ACM (for printing)
setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
printf("welcome to the STM32F1 CuVoodoo example code\n");
/* blink the LED with every transmitted character */
while (1) {
while (usart_received) { // echo every received character
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
printf("%c",usart_getchar()); // transmit receive character
}
__asm__("wfi"); // go to sleep
while (cdcacm_received) { // echo every received character
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
printf("%c",cdcacm_getchar()); // transmit receive character
}
__WFI(); // go to sleep
}
return 0;

2
main.h
View File

@ -15,9 +15,9 @@
/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
/* LED is on pin 11/PA1 */
#define LED_RCC RCC_GPIOA
#define LED_PORT GPIOA
#define LED_PIN GPIO1
#define LED_RCC RCC_GPIOA
/* default output (i.e. for printf) */
int _write(int file, char *ptr, int len);