static void board_init_spi2(void)
{
/* Remap SPI2 to DMA channels 6 and 7 */
STM32_SYSCFG_CFGR1 |= (1 << 24);
/* Set pin NSS to general purpose output mode (01b). */
/* Set pins SCK, MISO, and MOSI to alternate function (10b). */
STM32_GPIO_MODER(GPIO_B) &= ~0xff000000;
STM32_GPIO_MODER(GPIO_B) |= 0xa9000000;
/* Set all four pins to alternate function 0 */
STM32_GPIO_AFRH(GPIO_B) &= ~(0xffff0000);
/* Set all four pins to output push-pull */
STM32_GPIO_OTYPER(GPIO_B) &= ~(0xf000);
/* Set pullup on NSS */
STM32_GPIO_PUPDR(GPIO_B) |= 0x1000000;
/* Set all four pins to high speed */
STM32_GPIO_OSPEEDR(GPIO_B) |= 0xff000000;
/* Reset SPI2 */
STM32_RCC_APB1RSTR |= (1 << 14);
STM32_RCC_APB1RSTR &= ~(1 << 14);
/* Enable clocks to SPI2 module */
STM32_RCC_APB1ENR |= STM32_RCC_PB1_SPI2;
}
static void pins_init(void)
{
/* Pin usage:
* PA0 (OUT - OD GPIO) : Wakeup on Vnc / Threshold
* PA1 (ANALOG - ADC_IN1) : CC sense
* PA2 (ANALOG - ADC_IN2) : Current sense
* PA3 (ANALOG - ADC_IN3) : Voltage sense
* PA4 (OUT - OD GPIO) : PD TX enable
* PA5 (AF0 - SPI1_SCK) : TX clock in
* PA6 (AF0 - SPI1_MISO) : PD TX
* PA7 (AF5 - TIM3_CH2) : PD RX
* PA9 (AF1 - UART1_TX) : [DEBUG] UART TX
* PA10 (AF1 - UART1_RX) : [DEBUG] UART RX
* PA13 (OUT - GPIO) : voltage select[0]
* PA14 (OUT - GPIO) : voltage select[1]
* PB1 (AF0 - TIM14_CH1) : TX clock out
* PF0 (OUT - GPIO) : LM5050 FET driver off
* PF1 (OUT - GPIO) : discharge FET
*/
STM32_GPIO_ODR(GPIO_A) = /* HIGH(0) | */ HIGH(4);
STM32_GPIO_AFRL(GPIO_A) = AFx(7, 1);
STM32_GPIO_AFRH(GPIO_A) = AFx(9, 1) | AFx(10, 1);
STM32_GPIO_OTYPER(GPIO_A) = ODR(0) | ODR(4);
STM32_GPIO_OSPEEDR(GPIO_A) = HISPEED(5) | HISPEED(6) | HISPEED(7);
STM32_GPIO_MODER(GPIO_A) = OUT(0) | ANALOG(1) | ANALOG(2) | ANALOG(3)
| OUT(4) | AF(5) /*| AF(6)*/ | AF(7) | AF(9)
| AF(10) | OUT(13) | OUT(14);
/* set PF0 / PF1 as output */
STM32_GPIO_ODR(GPIO_F) = 0;
STM32_GPIO_MODER(GPIO_F) = OUT(0) | OUT(1);
STM32_GPIO_OTYPER(GPIO_F) = 0;
/* Set PB1 as AF0 (TIM14_CH1) */
STM32_GPIO_OSPEEDR(GPIO_B) = HISPEED(1);
STM32_GPIO_MODER(GPIO_B) = AF(1);
}