You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/* Board Support Package (BSP) for the EK-TM4C123GXL board */
|
|
#include <stdint.h> /* Standard integers. WG14/N843 C99 Standard */
|
|
|
|
#include "bsp.h"
|
|
#include "TM4C123GH6PM.h" /* the TM4C MCU Peripheral Access Layer (TI) */
|
|
|
|
/* on-board LEDs */
|
|
#define LED_RED (1U << 1)
|
|
#define LED_BLUE (1U << 2)
|
|
#define LED_GREEN (1U << 3)
|
|
|
|
// Buttons on the board (GPIOF)
|
|
#define BTN_SW1 (1U << 4U)
|
|
#define BTN_SW2 (1U << 0U)
|
|
|
|
uint32_t volatile ready_set;
|
|
|
|
/* ISRs ===============================================*/
|
|
void GPIOPortF_IRQHandler(void); // prototype
|
|
void GPIOPortF_IRQHandler(void) {
|
|
uint32_t pins = GPIOF_AHB->MIS;
|
|
GPIOF_AHB->ICR = 0xFFU; // clear interrupt sources
|
|
if ((pins & BTN_SW1) != 0U) {
|
|
ready_set |= ISR_1; // activate task-1
|
|
}
|
|
if ((pins & BTN_SW2) != 0U) {
|
|
ready_set |= ISR_2; // activate task-2
|
|
}
|
|
}
|
|
|
|
/* BSP functions ===========================================================*/
|
|
void BSP_init(void) {
|
|
SYSCTL->RCGCGPIO |= (1U << 5); /* enable Run mode for GPIOF */
|
|
SYSCTL->GPIOHBCTL |= (1U << 5); /* enable AHB for GPIOF */
|
|
GPIOF_AHB->DIR |= (LED_RED | LED_BLUE | LED_GREEN);
|
|
GPIOF_AHB->DEN |= (LED_RED | LED_BLUE | LED_GREEN);
|
|
|
|
// configure switches...
|
|
// unlock access to the SW2 pin because it is PROTECTED
|
|
GPIOF_AHB->LOCK = 0x4C4F434BU; // unlock GPIOCR register for SW2
|
|
// commit the write (cast const away)
|
|
*(uint32_t volatile *)&GPIOF_AHB->CR = 0x01U;
|
|
|
|
GPIOF_AHB->DIR &= ~(BTN_SW1 | BTN_SW2); // input pin
|
|
GPIOF_AHB->DEN |= (BTN_SW1 | BTN_SW2); // digital enable
|
|
GPIOF_AHB->PUR |= (BTN_SW1 | BTN_SW2); // pull-up resistor enable
|
|
|
|
*(uint32_t volatile *)&GPIOF_AHB->CR = 0x00U;
|
|
GPIOF_AHB->LOCK = 0x0; // lock GPIOCR register for SW2
|
|
|
|
// GPIO interrupt setup for SW1 and SW2
|
|
GPIOF_AHB->IS &= ~(BTN_SW1 | BTN_SW2); // edge detect
|
|
GPIOF_AHB->IBE &= ~(BTN_SW1 | BTN_SW2); // only one edge generate the interrupt
|
|
GPIOF_AHB->IEV &= ~(BTN_SW1 | BTN_SW2); // a falling edge triggers the interrupt
|
|
GPIOF_AHB->IM |= (BTN_SW1 | BTN_SW2); // enable GPIOF interrupt
|
|
|
|
// enable IRQs in the NVIC...
|
|
NVIC_EnableIRQ(GPIOF_IRQn);
|
|
// ...
|
|
}
|
|
|
|
void BSP_deployAirbag(void) {
|
|
GPIOF_AHB->DATA_Bits[LED_RED] = LED_RED;
|
|
}
|
|
|
|
void BSP_engageABS(void) {
|
|
GPIOF_AHB->DATA_Bits[LED_BLUE] = LED_BLUE;
|
|
}
|
|
|
|
uint32_t goToSleepCtr = 0;
|
|
void BSP_goToSleep() {
|
|
++goToSleepCtr;
|
|
// disable clock to the unused peripherals
|
|
// setup the desired sleep mode
|
|
__WFI(); // wait for interrupt; EXECUTION STOPS!
|
|
// enable clock to the used peripherals
|
|
__enable_irq(); // enable interrupts with PRIMASK
|
|
}
|
|
|
|
void BSP_intDisable(void) {
|
|
__disable_irq();
|
|
}
|
|
|
|
void BSP_intEnable(void) {
|
|
__enable_irq();
|
|
}
|
|
|
|
//............................................................................
|
|
_Noreturn void assert_failed(char const * const module, int const id) {
|
|
(void)module; // unused parameter
|
|
(void)id; // unused parameter
|
|
#ifndef NDEBUG
|
|
// light up all LEDs
|
|
GPIOF_AHB->DATA_Bits[LED_GREEN | LED_RED | LED_BLUE] = 0xFFU;
|
|
// for debugging, hang on in an endless loop...
|
|
for (;;) {
|
|
}
|
|
#endif
|
|
NVIC_SystemReset();
|
|
}
|