2 * ============ Hardware Abstraction Layer for MSP-EXP430G2 LaunchPad ============
6 #include "Em_Message.h"
11 /* -------- INTERNAL FEATURES -------- */
13 #define GREEN_LED_CONFIG() (P1DIR |= BIT6)
14 #define GREEN_LED_ON() (P1OUT |= BIT6)
15 #define GREEN_LED_OFF() (P1OUT &= ~BIT6)
16 #define GREEN_LED_READ() (P1OUT & BIT6)
17 #define GREEN_LED_TOGGLE() (P1OUT ^= BIT6)
19 #define RED_LED_CONFIG() (P1DIR |= BIT0)
20 #define RED_LED_ON() (P1OUT |= BIT0)
21 #define RED_LED_OFF() (P1OUT &= ~BIT0)
22 #define RED_LED_READ() (P1OUT & BIT0)
23 #define RED_LED_TOGGLE() (P1OUT ^= BIT0)
25 #define GPIO_CONFIG(mask) (P1DIR &= ~mask, P1REN |= mask, P1OUT |= mask, P1IES |= mask);
26 #define GPIO_ENABLE(mask) (P1IFG &= ~mask, P1IE |= mask)
27 #define GPIO_DISABLE(mask) (P1IE &= ~mask, P1IFG &= ~mask)
28 #define GPIO_FIRED(mask) (P1IFG & mask)
29 #define GPIO_ACK(mask) (P1IFG &= ~mask)
30 #define GPIO_LOW(mask) (!(P1IN & mask))
31 #define GPIO_DEBOUNCE_MSECS 100
33 #define EAP_RX_BUF UCA0RXBUF
34 #define EAP_TX_BUF UCA0TXBUF
36 #define EAP_RX_VECTOR USCIAB0RX_VECTOR
37 #define EAP_TX_VECTOR USCIAB0TX_VECTOR
38 #define EAP_TX_ACK_VECTOR PORT2_VECTOR
40 #define EAP_RX_ENABLE() (P1SEL |= BIT1, P1SEL2 |= BIT1)
41 #define EAP_RX_DISABLE() (P1SEL &= ~BIT1, P1SEL2 &= ~BIT1)
42 #define EAP_TX_ENABLE() (P1SEL |= BIT2, P1SEL2 |= BIT2)
43 #define EAP_TX_DISABLE() (P1SEL &= ~BIT2, P1SEL2 &= ~BIT2)
45 #define EAP_RX_ACK_CONFIG() (P2DIR |= BIT0)
46 #define EAP_RX_ACK_SET() (P2OUT |= BIT0)
47 #define EAP_RX_ACK_CLR() (P2OUT &= ~BIT0)
49 #define EAP_TX_ACK_CONFIG() (P2DIR &= ~BIT1, P2IES |= BIT1, P2IFG &= ~BIT1, P2IE |= BIT1)
50 #define EAP_TX_ACK_TST() (P2IFG & BIT1)
51 #define EAP_TX_ACK_CLR() (P2IFG &= ~BIT1)
53 #define EAP_RX_INT_CLR() (IFG2 &= ~UCA0RXIFG)
54 #define EAP_RX_INT_ENABLE() (IE2 |= UCA0RXIE)
55 #define EAP_TX_INT_CLR() (IFG2 &= ~UCA0TXIFG)
56 #define EAP_TX_INT_DISABLE() (IE2 &= ~UCA0TXIE)
57 #define EAP_TX_INT_ENABLE() (IE2 |= UCA0TXIE)
59 #define MCLK_TICKS_PER_MS 1000L
60 #define ACLK_TICKS_PER_SECOND 1500L /* was 12000L with divider /1 */
61 #define UART_WATCHDOG_PERIOD (ACLK_TICKS_PER_SECOND * 250) / 1000
63 #define UART_WATCH_DISABLE() (TA1CCTL1 = 0) // Turn off CCR1 Interrupt
64 #define UART_WATCH_ENABLE() (TA1CCR1 = TA1R + UART_WATCHDOG_PERIOD, TA1CCTL1 = CCIE) // Set CCR1, and Enable CCR1 Interrupt
67 #define DINT() __disable_interrupt()
68 #define EINT() __enable_interrupt()
70 #define SLEEP() _BIS_SR(LPM3_bits + GIE)
71 #define WAKEUP() _BIC_SR_IRQ(LPM3_bits)
74 #ifdef __TI_COMPILER_VERSION__
75 #define DINT() (_disable_interrupt())
76 #define EINT() (_enable_interrupt())
77 #define INTERRUPT interrupt
78 #define SLEEP() (__bis_SR_register(LPM3_bits + GIE))
79 #define WAKEUP() (__bic_SR_register_on_exit(LPM3_bits))
82 #define NUM_HANDLERS 5
84 #define EVENT3_HANDLER_ID 0
85 #define EVENT4_HANDLER_ID 1
86 #define EVENT5_HANDLER_ID 2
87 #define TICK_HANDLER_ID 3
88 #define DISPATCH_HANDLER_ID 4
90 static void gpioHandler(uint8_t id);
91 static void postEvent(uint8_t handlerId);
93 static Hal_Handler appSettleHandler;
94 static void (*appJitterHandler)(uint8_t id, uint32_t count);
95 static volatile uint16_t handlerEvents = 0;
96 static uint16_t clockTick = 0;
97 static Hal_Handler handlerTab[NUM_HANDLERS];
98 static volatile uint32_t gpioCount[3] = {0};
99 static bool timerActive[3] = {false, false, false};
100 static uint16_t timerPoint[3];
102 /* -------- INTERNAL FUNCTIONS -------- */
104 static uint32_t getCount(uint8_t id) {
106 uint32_t count = gpioCount[id];
112 static void setTimer(uint8_t id, uint16_t delay) {
116 timerActive[id] = true;
117 // enable clock if it was disabled to save power?
119 timerPoint[id] = now + delay;
120 left = ACLK_TICKS_PER_SECOND;
121 for (i = 0; i < 3; i++)
122 if (timerActive[i] && (timerPoint[i] - now) < left) {
123 left = timerPoint[i] - now;
125 TA1CCR0 = now + left;
129 static void clearTimer(uint8_t id) {
133 timerActive[id] = false;
134 for (i = 0; i < 3; i++)
135 if (timerActive[i]) keep = true;
138 // disable clock to save power?
142 static void gpioHandler(uint8_t id) {
145 setTimer(id, ACLK_TICKS_PER_SECOND); // One second ahead
148 static void tickHandler(uint16_t clock) {
151 for (i = 0; i < 3; i++)
152 if (timerActive[i] && timerPoint[i] == clock) {
153 uint32_t count = getCount(i);
154 uint16_t mask = BIT3 << i;
157 setTimer(i, ACLK_TICKS_PER_SECOND); // One second ahead
158 if (appJitterHandler) (*appJitterHandler)(i, count);
161 if (GPIO_LOW(mask) && appSettleHandler) (*appSettleHandler)(i);
164 // if all timers are unset, disable ticker.
167 static void postEvent(uint8_t handlerId) {
168 uint8_t key = Em_Hal_lock();
169 handlerEvents |= 1 << handlerId;
173 /* -------- APP-HAL INTERFACE -------- */
175 void Hal_gpioEnable(Hal_Handler shandler, void (*jhandler)(uint8_t id, uint32_t count)) {
179 for (id = 0, mask = BIT3; id < 3; id++, mask <<= 1) {
180 handlerTab[id] = gpioHandler;
181 appSettleHandler = shandler;
182 appJitterHandler = jhandler;
183 (P1DIR &= ~mask, P1REN |= mask, P1OUT |= mask, P1IES |= mask);
185 (P1IFG &= ~mask, P1IE |= mask);
187 handlerTab[TICK_HANDLER_ID] = tickHandler;
190 void Hal_connected(void) {
193 void Hal_delay(uint16_t msecs) {
195 __delay_cycles(MCLK_TICKS_PER_MS);
199 void Hal_disconnected(void) {
202 void Hal_init(void) {
206 WDTCTL = WDTPW + WDTHOLD;
208 /* MCLK divider = /1 */
209 /* SMCLK divider = /1 */
210 BCSCTL2 = SELM_0 + DIVM_0 + DIVS_0;
211 if (CALBC1_1MHZ != 0xFF) {
213 BCSCTL1 = CALBC1_1MHZ; /* Set DCO to 1MHz */
214 DCOCTL = CALDCO_1MHZ;
216 /* XT2 is off (Not used for MCLK/SMCLK) */
217 /* ACLK divider = /8 */
218 BCSCTL1 |= XT2OFF + DIVA_3;
219 /* XT2 range = 0.4 - 1 MHz */
220 /* LFXT1 range/VLO = VLOCLK (or 3-16 MHz if XTS=1) */
222 BCSCTL3 = XT2S_0 + LFXT1S_2 + XCAP_1;
232 TA1CTL = TASSEL_1 + MC_2; // ACLK, Continuous mode
233 UART_WATCH_DISABLE();
250 UCA0CTL1 = UCSSEL_2 + UCSWRST;
251 UCA0MCTL = UCBRF_0 + UCBRS_6;
253 UCA0CTL1 &= ~UCSWRST;
255 handlerTab[DISPATCH_HANDLER_ID] = Em_Message_dispatch;
258 void Hal_idleLoop(void) {
263 // atomically read/clear all handlerEvents
265 uint16_t events = handlerEvents;
268 if (events) { // dispatch all current events
273 for (id = 0, mask = 0x1; id < NUM_HANDLERS; id++, mask <<= 1) {
274 if ((events & mask) && handlerTab[id]) {
275 if (id == TICK_HANDLER_ID) {
284 else { // await more events
285 SLEEP(); // this also enables interrupts
290 void Hal_greenLedOn(void) {
294 void Hal_greenLedOff(void) {
298 bool Hal_greenLedRead(void) {
299 return GREEN_LED_READ();
302 void Hal_greenLedToggle(void) {
306 void Hal_redLedOn(void) {
310 void Hal_redLedOff(void) {
314 bool Hal_redLedRead(void) {
315 return RED_LED_READ();
318 void Hal_redLedToggle(void) {
322 uint16_t Hal_tickStart(uint16_t msecs, void (*handler)(uint16_t clock)) {
323 handlerTab[TICK_HANDLER_ID] = handler;
324 clockTick = (ACLK_TICKS_PER_SECOND * msecs) / 1000;
325 uint16_t then = TA1R + clockTick;
326 TA1CCR0 = then; // Set the CCR0 interrupt for msecs from now.
327 TA1CCTL0 = CCIE; // Enable the CCR0 interrupt
331 void Hal_tickStop(void) {
332 handlerTab[TICK_HANDLER_ID] = 0;
337 /* -------- SRT-HAL INTERFACE -------- */
339 uint8_t Em_Hal_lock(void) {
340 uint8_t key = _get_interrupt_state();
342 __disable_interrupt();
344 #ifdef __TI_COMPILER_VERSION__
345 _disable_interrupt();
350 void Em_Hal_reset(void) {
351 uint8_t key = Em_Hal_lock();
352 EAP_RX_ACK_CLR(); // suspend the MCM
354 EAP_RX_ACK_SET(); // reset the MCM
363 void Em_Hal_startSend() {
364 EAP_TX_BUF = Em_Message_startTx();
367 void Em_Hal_unlock(uint8_t key) {
368 _set_interrupt_state(key);
371 void Em_Hal_watchOff(void) {
372 UART_WATCH_DISABLE();
375 void Em_Hal_watchOn(void) {
379 /* -------- INTERRUPT SERVICE ROUTINES -------- */
382 __attribute__((interrupt(PORT1_VECTOR)))
384 #ifdef __TI_COMPILER_VERSION__
385 #pragma vector=PORT1_VECTOR
387 INTERRUPT void gpioIsr(void) {
391 for (id = 0, mask = BIT3; id < 3; id++, mask <<= 1)
392 if (GPIO_FIRED(mask)) {
401 __attribute__((interrupt(EAP_RX_VECTOR)))
403 #ifdef __TI_COMPILER_VERSION__
404 #pragma vector=EAP_RX_VECTOR
406 INTERRUPT void rxIsr(void) {
407 uint8_t b = EAP_RX_BUF;
408 Em_Message_startRx();
411 if (Em_Message_addByte(b)) {
412 postEvent(DISPATCH_HANDLER_ID);
418 __attribute__((interrupt(TIMER1_A0_VECTOR)))
420 #ifdef __TI_COMPILER_VERSION__
421 #pragma vector=TIMER1_A0_VECTOR
423 INTERRUPT void timerIsr(void) {
424 // TA1CCR0 += clockTick;
425 postEvent(TICK_HANDLER_ID);
430 __attribute__((interrupt(EAP_TX_ACK_VECTOR)))
432 #ifdef __TI_COMPILER_VERSION__
433 #pragma vector=EAP_TX_ACK_VECTOR
435 INTERRUPT void txAckIsr(void) {
436 if (EAP_TX_ACK_TST()) {
438 if (Em_Message_getByte(&b)) {
447 __attribute__((interrupt(TIMER1_A1_VECTOR)))
449 #ifdef __TI_COMPILER_VERSION__
450 #pragma vector=TIMER1_A1_VECTOR
452 INTERRUPT void uartWatchdogIsr(void) {
455 UART_WATCH_DISABLE();
456 Em_Message_restart();