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Added standard clock setup routines.

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Thanks to Thomas Otto for pointing out problems with the clock code in
examples and his clock routine implementations. Based on that the most
common clock combination routines were added to the library and all
routines in examples setting up the clock replaced with calls to that
functions.
This commit is contained in:
Piotr Esden-Tempski
2010-03-04 20:37:04 +01:00
parent d84c4030b2
commit d7489ebfbd
7 changed files with 114 additions and 94 deletions
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22
examples/mb525/fancyblink/fancyblink.c
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@@ -21,33 +21,17 @@
#include <libopenstm32/rcc.h>
#include <libopenstm32/gpio.h>
/* Set STM32 to 72 MHz. */
void clock_setup(void)
{
/* Select HSI as SYSCLK source. */
rcc_set_sysclk_source(SW_SYSCLKSEL_HSICLK);
rcc_clock_setup_in_hse_8mhz_out_72mhz();
/* Set the PLL multiplication factor to 9. */
rcc_set_pll_multiplication_factor(PLLMUL_PLL_CLK_MUL9);
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPCEN);
/* Select HSI/2 as PLL source. */
rcc_set_pll_source(PLLSRC_HSI_CLK_DIV2);
rcc_set_pllxtpre(PLLXTPRE_HSE_CLK_DIV2);
/* Enable PLL oscillator and wait for it to stabilize. */
rcc_osc_on(PLL);
rcc_wait_for_osc_ready(PLL);
/* Select PLL as SYSCLK source. */
rcc_set_sysclk_source(SW_SYSCLKSEL_PLLCLK);
}
void gpio_setup(void)
{
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, IOPCEN);
/* Set GPIO6 (in GPIO port C) to 'output push-pull'. */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO6 | GPIO7 | GPIO8 | GPIO9);