168 lines
4.5 KiB
C
168 lines
4.5 KiB
C
#include <TM4C123.h>
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#include <board.h>
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#define BOARD_UART UART0
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#define BOARD_UART_PORT GPIOA
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#define BOARD_BTN_PORT GPIOF
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#define BOARD_BTN 4
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#define BOARD_BTN_Msk (1u<<4)
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#define BUTTON_STATE_ACTIVE 0
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#define LED_PORT GPIOF
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#define LED_PIN_RED 1
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#define LED_PIN_BLUE 2
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#define LED_PIN_GREEN 3
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#define LED_STATE_ON 1
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static void board_uart_init(void)
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{
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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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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 = 9600 bits per second, refer manual for calculation **/
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UART0->CTL &= ~(1<<0); // Disable UART0 by clearing UARTEN bit in the UARTCTL register
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UART0->IBRD = 325; // Write the integer portion of the BRD to the UARTIRD register
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UART0->FBRD = 33; // 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, Recieve Enable
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}
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static void initialize_board_led(GPIOA_Type* port, uint8_t PinMsk, uint8_t dirmsk)
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{
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/* Enable PortF Clock */
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SYSCTL -> RCGCGPIO |= (1<<5) ;
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/* Let the clock stabilize */
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while(! ((SYSCTL->PRGPIO) & (1<<5)) ) ;
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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 board_switch_init(void)
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{
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GPIOF->DIR &= ~(1<<BOARD_BTN);
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GPIOF->PUR |= (1<<BOARD_BTN);
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GPIOF->DEN |= (1<<BOARD_BTN);
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}
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static void WriteGPIOPin(GPIOA_Type* port, uint8_t PinMsk, bool state)
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{
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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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static uint32_t ReadGPIOPin(GPIOA_Type *port, uint8_t pinMsk)
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{
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return (port -> DATA & pinMsk) ;
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}
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void board_init(void)
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{
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SystemCoreClockUpdate();
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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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// 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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/* 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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uint8_t leds = (1<<LED_PIN_RED) | (1<<LED_PIN_BLUE) | (1<<LED_PIN_GREEN) ;
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uint8_t dirmsk = (1<<LED_PIN_RED) | (1<<LED_PIN_BLUE) | (1<<LED_PIN_GREEN) ;
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/* Configure GPIO for board LED */
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initialize_board_led(LED_PORT,leds, dirmsk);
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/* Configure GPIO for board switch */
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board_switch_init();
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/* Initialize board UART */
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board_uart_init();
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}
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void board_led_write(bool state)
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{
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WriteGPIOPin(LED_PORT, (1<<LED_PIN_BLUE), state);
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}
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uint32_t board_button_read(void)
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{
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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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int board_uart_write(void const* buf, int len)
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{
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uint8_t const* data = buf;
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for(int i=0; i<len; i++)
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{
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while((UART0->FR &(1<<5)) != 0); // Poll until previous data was shofted out
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UART0->DR= data[i]; // Write UART0 DATA REGISTER
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}
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return len;
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}
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int board_uart_read(uint8_t* buf, int len)
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{
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(void) buf; (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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{
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system_ticks++;
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}
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uint32_t board_millis(void)
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{
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return system_ticks;
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}
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#endif
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