diff options
Diffstat (limited to 'circuitpython/lib/tinyusb/hw/bsp/tm4c123/family.c')
| -rw-r--r-- | circuitpython/lib/tinyusb/hw/bsp/tm4c123/family.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/circuitpython/lib/tinyusb/hw/bsp/tm4c123/family.c b/circuitpython/lib/tinyusb/hw/bsp/tm4c123/family.c new file mode 100644 index 0000000..b0947d6 --- /dev/null +++ b/circuitpython/lib/tinyusb/hw/bsp/tm4c123/family.c @@ -0,0 +1,178 @@ +#include "TM4C123.h" +#include "bsp/board.h" +#include "board.h" + +//--------------------------------------------------------------------+ +// Forward USB interrupt events to TinyUSB IRQ Handler +//--------------------------------------------------------------------+ +void USB0_Handler(void) +{ +#if CFG_TUH_ENABLED + tuh_int_handler(0); +#endif + +#if CFG_TUD_ENABLED + tud_int_handler(0); +#endif +} + +//--------------------------------------------------------------------+ +// MACRO TYPEDEF CONSTANT ENUM +//--------------------------------------------------------------------+ + +static void board_uart_init (void) +{ + SYSCTL->RCGCUART |= (1 << 0); // Enable the clock to UART0 + SYSCTL->RCGCGPIO |= (1 << 0); // Enable the clock to GPIOA + + GPIOA->AFSEL |= (1 << 1) | (1 << 0); // Enable the alternate function on pin PA0 & PA1 + GPIOA->PCTL |= (1 << 0) | (1 << 4); // Configure the GPIOPCTL register to select UART0 in PA0 and PA1 + GPIOA->DEN |= (1 << 0) | (1 << 1); // Enable the digital functionality in PA0 and PA1 + + // BAUDRATE = 115200, with SystemCoreClock = 50 Mhz refer manual for calculation + // - BRDI = SystemCoreClock / (16* baud) + // - BRDF = int(fraction*64 + 0.5) + UART0->CTL &= ~(1 << 0); // Disable UART0 by clearing UARTEN bit in the UARTCTL register + UART0->IBRD = 27; // Write the integer portion of the BRD to the UARTIRD register + UART0->FBRD = 8; // Write the fractional portion of the BRD to the UARTFBRD registerer + + UART0->LCRH = (0x3 << 5); // 8-bit, no parity, 1 stop bit + UART0->CC = 0x0; // Configure the UART clock source as system clock + + UART0->CTL = (1 << 0) | (1 << 8) | (1 << 9); // UART0 Enable, Transmit Enable, Recieve Enable +} + +static void initialize_board_led (GPIOA_Type *port, uint8_t PinMsk, uint8_t dirmsk) +{ + /* Enable PortF Clock */ + SYSCTL->RCGCGPIO |= (1 << 5); + + /* Let the clock stabilize */ + while ( !((SYSCTL->PRGPIO) & (1 << 5)) ) {} + + /* Port Digital Enable */ + port->DEN |= PinMsk; + + /* Set direction */ + port->DIR = dirmsk; +} + +static void board_switch_init (void) +{ + GPIOF->DIR &= ~(1 << BOARD_BTN); + GPIOF->PUR |= (1 << BOARD_BTN); + GPIOF->DEN |= (1 << BOARD_BTN); +} + +static void WriteGPIOPin (GPIOA_Type *port, uint8_t PinMsk, bool state) +{ + if ( state ) + { + port->DATA |= PinMsk; + } + else + { + port->DATA &= ~(PinMsk); + } +} + +static uint32_t ReadGPIOPin (GPIOA_Type *port, uint8_t pinMsk) +{ + return (port->DATA & pinMsk); +} + +void board_init (void) +{ + SystemCoreClockUpdate(); + +#if CFG_TUSB_OS == OPT_OS_NONE + // 1ms tick timer + SysTick_Config(SystemCoreClock / 1000); +#elif CFG_TUSB_OS == OPT_OS_FREERTOS + // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher ) + NVIC_SetPriority(USB0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY ); +#endif + + /* Reset USB */ + SYSCTL->SRCR2 |= (1u << 16); + + for ( volatile uint8_t i = 0; i < 20; i++ ) {} + + SYSCTL->SRCR2 &= ~(1u << 16); + + /* Open the USB clock gate */ + SYSCTL->RCGCUSB |= (1 << 0); + + /* Power-up USB PLL */ + SYSCTL->RCC2 &= ~(1u << 14); + + /* USB IO Initialization */ + SYSCTL->RCGCGPIO |= (1u << 3); + + /* Let the clock stabilize */ + while ( !(SYSCTL->PRGPIO & (1u << 3)) ) {} + + /* USB IOs to Analog Mode */ + GPIOD->AFSEL &= ~((1u << 4) | (1u << 5)); + GPIOD->DEN &= ~((1u << 4) | (1u << 5)); + GPIOD->AMSEL |= ((1u << 4) | (1u << 5)); + + uint8_t leds = (1 << LED_PIN_RED) | (1 << LED_PIN_BLUE) | (1 << LED_PIN_GREEN); + uint8_t dirmsk = (1 << LED_PIN_RED) | (1 << LED_PIN_BLUE) | (1 << LED_PIN_GREEN); + + /* Configure GPIO for board LED */ + initialize_board_led(LED_PORT, leds, dirmsk); + + /* Configure GPIO for board switch */ + board_switch_init(); + + /* Initialize board UART */ + board_uart_init(); + + TU_LOG1_INT(SystemCoreClock); +} + +void board_led_write (bool state) +{ + WriteGPIOPin(LED_PORT, (1 << LED_PIN_BLUE), state); +} + +uint32_t board_button_read (void) +{ + uint32_t gpio_value = ReadGPIOPin(BOARD_BTN_PORT, BOARD_BTN_Msk); + return BUTTON_STATE_ACTIVE ? gpio_value : !gpio_value; +} + +int board_uart_write (void const *buf, int len) +{ + uint8_t const * data = buf; + + for ( int i = 0; i < len; i++ ) + { + while ( (UART0->FR & (1 << 5)) != 0 ) {} // Poll until previous data was shofted out + UART0->DR = data[i]; // Write UART0 DATA REGISTER + } + + return len; +} + +int board_uart_read (uint8_t *buf, int len) +{ + (void) buf; + (void) len; + return 0; +} + +#if CFG_TUSB_OS == OPT_OS_NONE +volatile uint32_t system_ticks = 0; +void SysTick_Handler (void) +{ + system_ticks++; +} + +uint32_t board_millis (void) +{ + return system_ticks; +} +#endif + |