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/* metadata:
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manufacturer: Texas Instruments
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*/
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#include "bsp/board_api.h"
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#include "board.h"
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//--------------------------------------------------------------------+
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// Forward USB interrupt events to TinyUSB IRQ Handler
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//--------------------------------------------------------------------+
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void USB0_Handler(void) {
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#if CFG_TUH_ENABLED
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tuh_int_handler(0, true);
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#endif
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#if CFG_TUD_ENABLED
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tud_int_handler(0);
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#endif
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}
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//--------------------------------------------------------------------+
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// MACRO TYPEDEF CONSTANT ENUM
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//--------------------------------------------------------------------+
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static void board_uart_init(void) {
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SYSCTL->RCGCUART |= (1 << 0); // Enable the clock to UART0
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SYSCTL->RCGCGPIO |= (1 << 0); // Enable the clock to GPIOA
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while (!(SYSCTL->PRGPIO & (1 << 0))) {} // Wait for the GPIOA clock to stabilize
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while (!(SYSCTL->PRUART & (1 << 0))) {} // Wait for the UART0 clock to stabilize
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GPIOA->AFSEL |= (1 << 1) | (1 << 0); // Enable the alternate function on pin PA0 & PA1
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GPIOA->PCTL |= (1 << 0) | (1 << 4); // Configure the GPIOPCTL register to select UART0 in PA0 and PA1
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GPIOA->DEN |= (1 << 0) | (1 << 1); // Enable the digital functionality in PA0 and PA1
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// BAUDRATE = 115200, with SystemCoreClock = 50 Mhz refer manual for calculation
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// - BRDI = SystemCoreClock / (16* baud)
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// - BRDF = int(fraction*64 + 0.5)
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UART0->CTL &= ~(1U << 0); // Disable UART0 by clearing UARTEN bit in the UARTCTL register
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UART0->IBRD = 27; // Write the integer portion of the BRD to the UARTIRD register
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UART0->FBRD = 8; // Write the fractional portion of the BRD to the UARTFBRD registerer
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UART0->LCRH = (0x3 << 5); // 8-bit, no parity, 1 stop bit
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UART0->CC = 0x0; // Configure the UART clock source as system clock
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UART0->CTL = (1 << 0) | (1 << 8) | (1 << 9); // UART0 Enable, Transmit Enable, Receive Enable
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}
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static void board_button_init(GPIOA_Type* port, uint8_t PinMsk) {
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/* Enable Port Clock */
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SYSCTL->RCGCGPIO |= (1 << BTN_PORT_CLK);
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/* Let the clock stabilize */
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while (!((SYSCTL->PRGPIO) & (1 << BTN_PORT_CLK))) {}
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/* Port Digital Enable */
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port->DEN |= PinMsk;
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/* Set direction */
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port->DIR &= ~PinMsk;
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/* Enable internal pull so the idle state is deterministic. LaunchPad buttons
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* connect the pin to GND when pressed (active-low) and require a pull-up. */
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#if BUTTON_STATE_ACTIVE == 0
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port->PUR |= PinMsk;
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#else
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port->PDR |= PinMsk;
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#endif
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}
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static void board_led_init(GPIOA_Type* port, uint8_t PinMsk, uint8_t dirmsk) {
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/* Enable Port Clock */
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SYSCTL->RCGCGPIO |= (1 << LED_PORT_CLK);
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/* Let the clock stabilize */
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while (!((SYSCTL->PRGPIO) & (1 << LED_PORT_CLK))) {}
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/* Port Digital Enable */
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port->DEN |= PinMsk;
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/* Set direction */
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port->DIR = dirmsk;
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}
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static void WriteGPIOPin(GPIOA_Type* port, uint8_t PinMsk, bool state) {
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if (state) {
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port->DATA |= PinMsk;
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} else {
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port->DATA &= ~(PinMsk);
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}
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}
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static uint32_t ReadGPIOPin(GPIOA_Type* port, uint8_t pinMsk) {
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return (port->DATA & pinMsk);
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}
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void board_init(void) {
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#ifdef TM4C123_H
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SystemCoreClockUpdate();
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#endif
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#if CFG_TUSB_OS == OPT_OS_NONE
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// 1ms tick timer
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SysTick_Config(SystemCoreClock / 1000);
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#elif CFG_TUSB_OS == OPT_OS_FREERTOS
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// Explicitly disable systick to prevent its ISR from running before scheduler start
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SysTick->CTRL &= ~1U;
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// If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
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NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY );
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#endif
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#ifdef TM4C123_H
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/* Reset USB */
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SYSCTL->SRCR2 |= (1u << 16);
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for (volatile uint8_t i = 0; i < 20; i++) {}
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SYSCTL->SRCR2 &= ~(1u << 16);
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/* Open the USB clock gate */
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SYSCTL->RCGCUSB |= (1 << 0);
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/* Power-up USB PLL */
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SYSCTL->RCC2 &= ~(1u << 14);
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/* USB IO Initialization */
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SYSCTL->RCGCGPIO |= (1u << 3);
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/* Let the clock stabilize */
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while (!(SYSCTL->PRGPIO & (1u << 3))) {}
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/* USB IOs to Analog Mode */
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GPIOD->AFSEL &= ~((1u << 4) | (1u << 5));
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GPIOD->DEN &= ~((1u << 4) | (1u << 5));
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GPIOD->AMSEL |= ((1u << 4) | (1u << 5));
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#else // TM4C129
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/* Reset USB */
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SYSCTL->SRUSB = 1;
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for (volatile uint8_t i = 0; i < 20; i++) {}
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SYSCTL->SRUSB = 0;
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/* Open the USB clock gate */
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SYSCTL->RCGCUSB = 1;
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/* Let the clock stabilize */
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while(!(SYSCTL->PRUSB & 1)) {}
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/* USB IO Initialization */
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SYSCTL->RCGCGPIO |= (1u << 10);
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/* Let the clock stabilize */
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while (!(SYSCTL->PRGPIO & (1u << 10))) {}
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/* USB IOs to Analog Mode */
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GPIOL->AFSEL &= ~((1u << 6) | (1u << 7));
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GPIOL->DEN &= ~((1u << 6) | (1u << 7));
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GPIOL->AMSEL |= ((1u << 6) | (1u << 7));
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/* USB Clock Configuration */
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USB0->CC = 0x207;
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#endif
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uint8_t leds = 1 << BOARD_LED_PIN;
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uint8_t dirmsk = 1 << BOARD_LED_PIN;
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/* Configure GPIO for board button */
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board_button_init(BOARD_BTN_PORT, BOARD_BTN_Msk);
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/* Configure GPIO for board LED */
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board_led_init(LED_PORT, leds, dirmsk);
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/* Initialize board UART */
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board_uart_init();
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TU_LOG1_INT(SystemCoreClock);
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}
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void board_led_write(bool state) {
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WriteGPIOPin(LED_PORT, (1 << BOARD_LED_PIN), state);
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}
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uint32_t board_button_read(void) {
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uint32_t gpio_value = ReadGPIOPin(BOARD_BTN_PORT, BOARD_BTN_Msk);
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return BUTTON_STATE_ACTIVE ? gpio_value : !gpio_value;
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}
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size_t board_get_unique_id(uint8_t id[], size_t max_len) {
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(void) max_len;
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uint8_t const len = 8;
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// Note: DID0, DID1 are variant ID, they aer used since TM4C123 does not have unique ID
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memcpy(id, (void*)(uintptr_t) &SYSCTL->DID0, len);
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return len;
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}
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int board_uart_write(void const* buf, int len) {
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uint8_t const* data = buf;
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int count = 0;
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while (count < len) {
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if ((UART0->FR & (1 << 5)) == 0) { // TX FIFO not full
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UART0->DR = data[count];
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count++;
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} else {
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break;
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}
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}
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return count;
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}
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int board_uart_read(uint8_t* buf, int len) {
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(void) buf;
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(void) len;
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return 0;
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}
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#if CFG_TUSB_OS == OPT_OS_NONE
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volatile uint32_t system_ticks = 0;
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void SysTick_Handler(void) {
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system_ticks++;
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}
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uint32_t tusb_time_millis_api(void) {
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return system_ticks;
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}
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#endif
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