EMTime/libopencm3-examples
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[stm32f429i-discovery] Switched over to UART1.

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UART1 is connected through two jumpers to the programmer chip on the
board. Making the use of it very streight forward.
This commit is contained in:
Piotr Esden-Tempski
2015-01-22 18:27:28 -08:00
parent d6cb05d792
commit 86c42bc2dd
6 changed files with 67 additions and 64 deletions
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25
examples/stm32/f4/stm32f429i-discovery/usart_console/usart_console.c
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@@ -35,7 +35,7 @@
* we can use on a serial port.
*/
#define CONSOLE_UART USART2
#define CONSOLE_UART USART1
void console_putc(char c);
char console_getc(int wait);
@@ -134,28 +134,29 @@ int main(void) {
clock_setup(); // initialize our clock
/* MUST enable the GPIO clock in ADDITION to the USART clock */
rcc_periph_clock_enable(RCC_GPIOD);
rcc_periph_clock_enable(RCC_GPIOA);
/* This example uses PD5 and PD6 for Tx and Rx respectively
* but other pins are available for this role on USART2 (our chosen
* USART) as well, such as PA2 and PA3. You can also split them
* so PA2 for Tx, PD6 for Rx but you would have to enable both
* the GPIOA and GPIOD clocks in that case
/* This example uses PA9 and PA10 for Tx and Rx respectively
* but other pins are available for this role on USART1 (our chosen
* USART) as it is connected to the programmer interface through
* jumpers.
*/
gpio_mode_setup(GPIOD, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO5 | GPIO6);
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9 | GPIO10);
/* Actual Alternate function number (in this case 7) is part
* depenedent, check the data sheet for the right number to
* use.
*/
gpio_set_af(GPIOD, GPIO_AF7, GPIO5 | GPIO6);
gpio_set_af(GPIOA, GPIO_AF7, GPIO9 | GPIO10);
/* This then enables the clock to the USART2 peripheral which is
* attached inside the chip to the APB2 bus. Different peripherals
/* This then enables the clock to the USART1 peripheral which is
* attached inside the chip to the APB1 bus. Different peripherals
* attach to different buses, and even some UARTS are attached to
* APB1 and some to APB2, again the data sheet is useful here.
* We use the rcc_periph_clock_enable function that knows on which bus
* the peripheral is and sets things up accordingly.
*/
rcc_periph_clock_enable(RCC_USART2);
rcc_periph_clock_enable(RCC_USART1);
/* Set up USART/UART parameters using the libopencm3 helper functions */
usart_set_baudrate(CONSOLE_UART, 115200);