diff options
Diffstat (limited to 'tests/rcc-legal-ranges/main-stm32l1-generic.c')
| -rw-r--r-- | tests/rcc-legal-ranges/main-stm32l1-generic.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/tests/rcc-legal-ranges/main-stm32l1-generic.c b/tests/rcc-legal-ranges/main-stm32l1-generic.c deleted file mode 100644 index 8c97bad..0000000 --- a/tests/rcc-legal-ranges/main-stm32l1-generic.c +++ /dev/null @@ -1,154 +0,0 @@ -/* - * Aug 2016 Karl Palsson <karlp@tweak.net.au> - */ - -#include <stdlib.h> -#include <libopencm3/stm32/flash.h> -#include <libopencm3/stm32/gpio.h> -#include <libopencm3/stm32/pwr.h> -#include <libopencm3/stm32/rcc.h> - -/* Disco board is b6 */ -#define LEDPORT GPIOB -#define LEDPIN GPIO6 - -#ifndef ARRAY_LENGTH -#define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0])) -#endif - -/* - * A set of valid clock configurations with HSI as the source. - * thankfully, L1 allows apb1/apb2 to reach full ahb speed in all cases. - */ -struct rcc_clock_scale valid_hsi_clocks[] = { - { - /* 8Mhz, hsi/div2, max perf for range 2 with 0 ws */ - .hpre = RCC_CFGR_HPRE_SYSCLK_DIV2, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE2_HCLK_NODIV, - .voltage_scale = PWR_SCALE2, - .flash_config = FLASH_ACR_LATENCY_0WS, - .ahb_frequency = 8e6, - .apb1_frequency = 8e6, - .apb2_frequency = 8e6, - }, - { - /* Slowest hsi possible */ - .hpre = RCC_CFGR_HPRE_SYSCLK_DIV512, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE1_HCLK_NODIV, - .voltage_scale = PWR_SCALE3, - .flash_config = FLASH_ACR_LATENCY_0WS, - .ahb_frequency = 31250, - .apb1_frequency = 31250, - .apb2_frequency = 31250, - }, - { - /* Fastest HSI possible, range 1, 0ws */ - .hpre = RCC_CFGR_HPRE_SYSCLK_NODIV, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE1_HCLK_NODIV, - .voltage_scale = PWR_SCALE1, - .flash_config = FLASH_ACR_LATENCY_0WS, - .ahb_frequency = 16e6, - .apb1_frequency = 16e6, - .apb2_frequency = 16e6, - }, - { - /* highest perf for range 3 with 0 wait states */ - .hpre = RCC_CFGR_HPRE_SYSCLK_DIV8, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE1_HCLK_NODIV, - .voltage_scale = PWR_SCALE3, - .flash_config = FLASH_ACR_LATENCY_0WS, - .ahb_frequency = 2e6, - .apb1_frequency = 2e6, - .apb2_frequency = 2e6, - }, - { - /* Fastest HSI for range 2, 0ws */ - .hpre = RCC_CFGR_HPRE_SYSCLK_NODIV, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE1_HCLK_NODIV, - .voltage_scale = PWR_SCALE1, - .flash_config = FLASH_ACR_LATENCY_0WS, - .ahb_frequency = 16e6, - .apb1_frequency = 16e6, - .apb2_frequency = 16e6, - }, - { - /* highest perf for range 3 */ - .hpre = RCC_CFGR_HPRE_SYSCLK_DIV4, - .ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV, - .ppre2 = RCC_CFGR_PPRE1_HCLK_NODIV, - .voltage_scale = PWR_SCALE3, - .flash_config = FLASH_ACR_LATENCY_1WS, - .ahb_frequency = 4e6, - .apb1_frequency = 4e6, - .apb2_frequency = 4e6, - }, -}; - -int shuffled[ARRAY_LENGTH(valid_hsi_clocks)]; - -/** - * blink led count times, with vile hack * 1000 asm nops - */ -static void hack_blink(int count, int hack) -{ - for (int i = 0; i < count; i++) { - gpio_toggle(LEDPORT, LEDPIN); - for (int k = 0; k < hack * 1000; k++) { - __asm__("nop"); - } - } -} - -/* Stack overflow, wiki, whathaveyou */ -/* FIXME oh yeah, did I mention that rand() is always zero? */ -static void shuffle_fisher_yates(int *array, size_t n) -{ - if (n > 1) { - size_t i; - for (i = 0; i < n - 1; i++) { - size_t j = i + rand() / (RAND_MAX / (n - i) + 1); - int t = array[j]; - array[j] = array[i]; - array[i] = t; - } - } -} - -static void run_clock_set(void) -{ - shuffle_fisher_yates(shuffled, ARRAY_LENGTH(shuffled)); - - struct rcc_clock_scale *clock; - for (size_t i = 0; i < ARRAY_LENGTH(shuffled); i++) { - clock = &valid_hsi_clocks[i]; - rcc_clock_setup_hsi(clock); - /** blink quickly/slowly as we run through these */ - hack_blink(10, clock->ahb_frequency / (500 * 1000)); - hack_blink(4, clock->ahb_frequency / (200 * 1000)); - } -} - -int main(void) -{ - /* Allow leds on any port */ - RCC_AHBENR |= 0xff; - gpio_mode_setup(LEDPORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LEDPIN); - /* blink twice with slow msi reset clock */ - hack_blink(4, 60); - - /* ok, now, "randomly" sort the list of clocks to try them out */ - for (size_t i = 0; i < ARRAY_LENGTH(shuffled); i++) { - shuffled[i] = i; - } - - while (1) { - run_clock_set(); - } - - return 0; -} |