/**
* @brief Fades the error LED on and off
* @sideeffect Sets output push-pull on ERROR_LED_PIN.
*/
void throb(void) {
#ifdef HAVE_ERROR_LED
int32 slope = 1;
uint32 CC = 0x0000;
uint32 TOP_CNT = 0x0800;
uint32 i = 0;
gpio_set_mode(ERROR_LED_PIN, GPIO_OUTPUT_PP);
/* Error fade. */
while (1) {
if (CC == TOP_CNT) {
slope = -1;
} else if (CC == 0) {
slope = 1;
}
if (i == TOP_CNT) {
CC += slope;
i = 0;
}
if (i < CC) {
gpio_set_pin(ERROR_LED_PIN);
} else {
gpio_clear_pin(ERROR_LED_PIN);
}
i++;
}
#else
/* No error LED is defined; do nothing. */
while (1)
;
#endif
}
void system_setup(void) {
init_pll_clock(PLL_SRC_HSE, 16, 336, 0, 7); // (M, N, P ,Q) => 168 MHz PLL clock
init_timer_2(168, 1000);
gpio_d_clk_enable();
gpio_init( GPIOD,
GPIO_PIN_N15 | GPIO_PIN_N14 | GPIO_PIN_N13 | GPIO_PIN_N12,
GPIO_PIN_MODE_OUTPUT,
GPIO_PIN_OTYPE_PP,
GPIO_PIN_PULL_NONE,
GPIO_PIN_SPEED_VHIGH);
gpio_clear_pin(GPIOD, GPIO_PIN_N15 | GPIO_PIN_N14 | GPIO_PIN_N13 | GPIO_PIN_N12);
init_uart_2(); // UART 2 Rx->PD6 Tx->PD5
init_uart_3(); // UART 3 Rx->PB11 Tx->PB10
uart_2_send_string("STM32 initialization complete\n\r");
}
