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148 lines
5.6 KiB
C
148 lines
5.6 KiB
C
/*============================================================================
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* ET: embedded test; BSP for EK-TM4C123GXL
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*
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* Q u a n t u m L e a P s
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* ------------------------
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* Modern Embedded Software
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*
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* Copyright (C) 2005 Quantum Leaps, <state-machine.com>.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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============================================================================*/
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#include "et.h" /* ET: embedded test */
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#include "TM4C123GH6PM.h" /* the device specific header (TI) */
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/* add other drivers if necessary... */
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//DBC_MODULE_NAME("bsp_ek-tm4c123gxl")
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/* Local-scope objects -----------------------------------------------------*/
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/* LEDs on the board */
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#define LED_RED (1U << 1)
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#define LED_GREEN (1U << 3)
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#define LED_BLUE (1U << 2)
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/* Buttons on the board */
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#define BTN_SW1 (1U << 4)
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#define BTN_SW2 (1U << 0)
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/* Test pins */
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#define PD0_PIN (1U << 0)
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#define PD1_PIN (1U << 1)
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/* UART for testing */
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#define UART_BAUD_RATE 115200U
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#define UART_FR_TXFE (1U << 7)
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#define UART_FR_RXFE (1U << 4)
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#define UART_BUSY (1U << 3)
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#define UART_TXFF (1U << 5)
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#define UART_TXFIFO_DEPTH 16U
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/*..........................................................................*/
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void ET_onInit(int argc, char *argv[]) {
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(void)argc;
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(void)argv;
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/* NOTE: SystemInit() has been already called from the startup code
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* but SystemCoreClock needs to be updated
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*/
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SystemCoreClockUpdate();
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/* enable clock for to the peripherals used by this application... */
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SYSCTL->RCGCGPIO |= (1U << 5); /* enable Run mode for GPIOF */
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SYSCTL->GPIOHBCTL |= (1U << 5); /* enable AHB for GPIOF */
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__ISB();
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__DSB();
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/* configure LEDs (digital output) */
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GPIOF_AHB->DIR |= (LED_RED | LED_BLUE | LED_GREEN);
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GPIOF_AHB->DEN |= (LED_RED | LED_BLUE | LED_GREEN);
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GPIOF_AHB->DATA_Bits[LED_RED | LED_BLUE | LED_GREEN] = 0U;
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/* configure switches... */
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/* unlock access to the SW2 pin because it is PROTECTED */
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GPIOF_AHB->LOCK = 0x4C4F434BU; /* unlock GPIOCR register for SW2 */
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/* commit the write (cast const away) */
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*(uint32_t volatile *)&GPIOF_AHB->CR = 0x01U;
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GPIOF_AHB->DIR &= ~(BTN_SW1 | BTN_SW2); /* input */
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GPIOF_AHB->DEN |= (BTN_SW1 | BTN_SW2); /* digital enable */
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GPIOF_AHB->PUR |= (BTN_SW1 | BTN_SW2); /* pull-up resistor enable */
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*(uint32_t volatile *)&GPIOF_AHB->CR = 0x00U;
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GPIOF_AHB->LOCK = 0x0; /* lock GPIOCR register for SW2 */
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/* enable clock for UART0 and GPIOA (used by UART0 pins) */
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SYSCTL->RCGCUART |= (1U << 0); /* enable Run mode for UART0 */
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SYSCTL->RCGCGPIO |= (1U << 0); /* enable Run mode for GPIOA */
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/* configure UART0 pins for UART operation */
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uint32_t tmp = (1U << 0) | (1U << 1);
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GPIOA->DIR &= ~tmp;
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GPIOA->SLR &= ~tmp;
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GPIOA->ODR &= ~tmp;
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GPIOA->PUR &= ~tmp;
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GPIOA->PDR &= ~tmp;
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GPIOA->AMSEL &= ~tmp; /* disable analog function on the pins */
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GPIOA->AFSEL |= tmp; /* enable ALT function on the pins */
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GPIOA->DEN |= tmp; /* enable digital I/O on the pins */
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GPIOA->PCTL &= ~0x00U;
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GPIOA->PCTL |= 0x11U;
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/* configure the UART for the desired baud rate, 8-N-1 operation */
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tmp = (((SystemCoreClock * 8U) / UART_BAUD_RATE) + 1U) / 2U;
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UART0->IBRD = tmp / 64U;
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UART0->FBRD = tmp % 64U;
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UART0->LCRH = (0x3U << 5); /* configure 8-N-1 operation */
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UART0->CTL = (1U << 0) /* UART enable */
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| (1U << 8) /* UART TX enable */
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| (1U << 9) /* UART RX enable */
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| (1U << 4); /* EOT end of transmission */
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}
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/*..........................................................................*/
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void ET_onPrintChar(char const ch) {
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/* busy-wait as long as UART busy */
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while ((UART0->FR & UART_BUSY) != 0) {
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}
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UART0->DR = ch; /* write the byte into Data Register */
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}
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/*..........................................................................*/
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void ET_onExit(int err) {
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(void)err;
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/* turn all LEDs off */
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GPIOF_AHB->DATA_Bits[LED_RED | LED_BLUE | LED_GREEN] = 0U;
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/* blink the on-board LED2... */
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for (;;) {
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unsigned volatile ctr;
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GPIOF_AHB->DATA_Bits[LED_GREEN] ^= LED_GREEN;
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for (ctr = 200000U; ctr != 0U; --ctr) {}
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}
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}
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/*..........................................................................*/
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/* fault handler called from the exception handlers in the startup code */
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void assert_failed(char const * const module, int const loc) {
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(void)module;
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(void)loc;
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ET_onExit(-1);
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}
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