example code now also uses USB CDC ACM
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19
main.c
19
main.c
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@ -25,10 +25,12 @@
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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/* own libraries */
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/* own libraries */
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#include "main.h" // board definitions
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#include "main.h" // board definitions
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#include "usart.h" // USART utilities
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#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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/* default output (i.e. for printf) */
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/* default output (i.e. for printf) */
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int _write(int file, char *ptr, int len)
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int _write(int file, char *ptr, int len)
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@ -39,8 +41,10 @@ int _write(int file, char *ptr, int len)
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for (i = 0; i < len; i++) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
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if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
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usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
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usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
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cdcacm_putchar('\r'); // a second line feed doesn't break the display
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}
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}
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usart_putchar_nonblocking(ptr[i]); // send byte over USART
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usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar(ptr[i]); // send byte over USB
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}
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}
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return i;
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return i;
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}
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}
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@ -56,8 +60,7 @@ static void clock_setup(void)
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static void gpio_setup(void)
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static void gpio_setup(void)
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{
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{
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/* set LED pin to 'output push-pull' */
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN);
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}
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}
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int main(void)
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int main(void)
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@ -67,16 +70,24 @@ int main(void)
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clock_setup(); // setup main clock
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clock_setup(); // setup main clock
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gpio_setup(); // setup main inputs/ouputs
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gpio_setup(); // setup main inputs/ouputs
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usart_setup(); // setup USART (for printing)
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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printf("welcome to the STM32F1 CuVoodoo example code\n");
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/* blink the LED with every transmitted character */
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/* blink the LED with every transmitted character */
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while (1) {
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while (1) {
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while (usart_received) { // echo every received character
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while (usart_received) { // echo every received character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",usart_getchar()); // transmit receive character
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printf("%c",usart_getchar()); // transmit receive character
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}
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}
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__asm__("wfi"); // go to sleep
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while (cdcacm_received) { // echo every received character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",cdcacm_getchar()); // transmit receive character
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}
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__WFI(); // go to sleep
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}
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}
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return 0;
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return 0;
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2
main.h
2
main.h
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@ -15,9 +15,9 @@
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/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
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/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
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/* LED is on pin 11/PA1 */
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/* LED is on pin 11/PA1 */
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#define LED_RCC RCC_GPIOA
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#define LED_PORT GPIOA
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#define LED_PORT GPIOA
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#define LED_PIN GPIO1
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#define LED_PIN GPIO1
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#define LED_RCC RCC_GPIOA
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/* default output (i.e. for printf) */
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/* default output (i.e. for printf) */
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int _write(int file, char *ptr, int len);
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int _write(int file, char *ptr, int len);
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