James Coleman / lmic_MOTE_L152RC

Updates as of 2-17-16 for debugging K22F LoRa platform.

Fork of lmic_MOTE_L152RC by Timothy Mulrooney

TARGET_MOTE_L152RC/hal.cpp@0:f2716e543d97, 2015-06-02 (annotated)

Committer:
dudmuck
Date:
Tue Jun 02 19:04:29 2015 +0000
Revision:
0:f2716e543d97
Child:
1:04fd63382b03
lmic-v1.5 for MOTE_L152RC

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dudmuck 0:f2716e543d97 1 /* HAL for MOTE_L152RC */
dudmuck 0:f2716e543d97 2
dudmuck 0:f2716e543d97 3 #include "mbed.h"
dudmuck 0:f2716e543d97 4 #include "oslmic.h"
dudmuck 0:f2716e543d97 5 #include "debug.h"
dudmuck 0:f2716e543d97 6
dudmuck 0:f2716e543d97 7 #define RADIO_MOSI PB_15
dudmuck 0:f2716e543d97 8 #define RADIO_MISO PB_14
dudmuck 0:f2716e543d97 9 #define RADIO_SCLK PB_13
dudmuck 0:f2716e543d97 10 #define RADIO_NSS PB_12
dudmuck 0:f2716e543d97 11 #define RESET_PIN PC_2
dudmuck 0:f2716e543d97 12
dudmuck 0:f2716e543d97 13 #define RFSW1 PC_4 //NorAm_Mote RFSwitch_CNTR_1
dudmuck 0:f2716e543d97 14 #define RFSW2 PC_13 //NorAm_Mote RFSwitch_CNTR_2
dudmuck 0:f2716e543d97 15
dudmuck 0:f2716e543d97 16 static DigitalOut nss(RADIO_NSS);
dudmuck 0:f2716e543d97 17 static SPI spi(RADIO_MOSI, RADIO_MISO, RADIO_SCLK); // (mosi, miso, sclk)
dudmuck 0:f2716e543d97 18
dudmuck 0:f2716e543d97 19 static DigitalInOut rst(RESET_PIN);
dudmuck 0:f2716e543d97 20
dudmuck 0:f2716e543d97 21 //DigitalOut RFSwitch_CNTR_2(PC_13);
dudmuck 0:f2716e543d97 22 //static DigitalOut rxtx(PC_4); // RFSwitch_CNTR_1
dudmuck 0:f2716e543d97 23 DigitalOut rfsw1(RFSW1);
dudmuck 0:f2716e543d97 24 DigitalOut rfsw2(RFSW2);
dudmuck 0:f2716e543d97 25
dudmuck 0:f2716e543d97 26 static DigitalOut hdr_fem_ctx(PC_7);
dudmuck 0:f2716e543d97 27
dudmuck 0:f2716e543d97 28 static InterruptIn dio0(PC_6);
dudmuck 0:f2716e543d97 29 static InterruptIn dio1(PC_10);
dudmuck 0:f2716e543d97 30 static InterruptIn dio2(PC_11);
dudmuck 0:f2716e543d97 31
dudmuck 0:f2716e543d97 32 extern RTC_HandleTypeDef RtcHandle;
dudmuck 0:f2716e543d97 33
dudmuck 0:f2716e543d97 34 // HAL state
dudmuck 0:f2716e543d97 35 static struct {
dudmuck 0:f2716e543d97 36 int irqlevel;
dudmuck 0:f2716e543d97 37 } HAL;
dudmuck 0:f2716e543d97 38
dudmuck 0:f2716e543d97 39 void radio_irq_handler (u1_t dio);
dudmuck 0:f2716e543d97 40
dudmuck 0:f2716e543d97 41 static void dio0Irq( void ){
dudmuck 0:f2716e543d97 42 radio_irq_handler( 0 );
dudmuck 0:f2716e543d97 43 }
dudmuck 0:f2716e543d97 44 static void dio1Irq( void ){
dudmuck 0:f2716e543d97 45 radio_irq_handler( 1 );
dudmuck 0:f2716e543d97 46 }
dudmuck 0:f2716e543d97 47 static void dio2Irq( void ){
dudmuck 0:f2716e543d97 48 radio_irq_handler( 2 );
dudmuck 0:f2716e543d97 49 }
dudmuck 0:f2716e543d97 50
dudmuck 0:f2716e543d97 51 void hal_disableIRQs()
dudmuck 0:f2716e543d97 52 {
dudmuck 0:f2716e543d97 53 __disable_irq();
dudmuck 0:f2716e543d97 54 HAL.irqlevel++;
dudmuck 0:f2716e543d97 55 }
dudmuck 0:f2716e543d97 56
dudmuck 0:f2716e543d97 57 void hal_enableIRQs()
dudmuck 0:f2716e543d97 58 {
dudmuck 0:f2716e543d97 59 if (--HAL.irqlevel == 0) {
dudmuck 0:f2716e543d97 60 __enable_irq();
dudmuck 0:f2716e543d97 61 }
dudmuck 0:f2716e543d97 62 }
dudmuck 0:f2716e543d97 63
dudmuck 0:f2716e543d97 64 void hal_failed ()
dudmuck 0:f2716e543d97 65 {
dudmuck 0:f2716e543d97 66 while (1)
dudmuck 0:f2716e543d97 67 asm("nop");
dudmuck 0:f2716e543d97 68 }
dudmuck 0:f2716e543d97 69
dudmuck 0:f2716e543d97 70 static void rtc_wkup_irq(void)
dudmuck 0:f2716e543d97 71 {
dudmuck 0:f2716e543d97 72 HAL_RTCEx_WakeUpTimerIRQHandler(&RtcHandle);
dudmuck 0:f2716e543d97 73 }
dudmuck 0:f2716e543d97 74
dudmuck 0:f2716e543d97 75 void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc)
dudmuck 0:f2716e543d97 76 {
dudmuck 0:f2716e543d97 77 /* Clear Wake Up Flag */
dudmuck 0:f2716e543d97 78 __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
dudmuck 0:f2716e543d97 79 }
dudmuck 0:f2716e543d97 80
dudmuck 0:f2716e543d97 81 /*void HAL_RCC_CCSCallback()
dudmuck 0:f2716e543d97 82 {
dudmuck 0:f2716e543d97 83 for (;;) asm("nop");
dudmuck 0:f2716e543d97 84 }*/
dudmuck 0:f2716e543d97 85
dudmuck 0:f2716e543d97 86
dudmuck 0:f2716e543d97 87 volatile uint32_t /*rcc_cr_a, rcc_cr_b,*/ rcc_cr_c;
dudmuck 0:f2716e543d97 88 void hal_init (void)
dudmuck 0:f2716e543d97 89 {
dudmuck 0:f2716e543d97 90 memset(&HAL, 0x00, sizeof(HAL));
dudmuck 0:f2716e543d97 91 hal_disableIRQs();
dudmuck 0:f2716e543d97 92
dudmuck 0:f2716e543d97 93 #if USE_SMTC_RADIO_DRIVER
dudmuck 0:f2716e543d97 94
dudmuck 0:f2716e543d97 95 #else
dudmuck 0:f2716e543d97 96 // configure input lines
dudmuck 0:f2716e543d97 97 dio0.mode(PullDown);
dudmuck 0:f2716e543d97 98 dio0.rise(dio0Irq);
dudmuck 0:f2716e543d97 99 dio0.enable_irq();
dudmuck 0:f2716e543d97 100 dio1.mode(PullDown);
dudmuck 0:f2716e543d97 101 dio1.rise(dio1Irq);
dudmuck 0:f2716e543d97 102 dio1.enable_irq();
dudmuck 0:f2716e543d97 103 dio2.mode(PullDown);
dudmuck 0:f2716e543d97 104 dio2.rise(dio2Irq);
dudmuck 0:f2716e543d97 105 dio2.enable_irq();
dudmuck 0:f2716e543d97 106 // configure reset line
dudmuck 0:f2716e543d97 107 rst.input();
dudmuck 0:f2716e543d97 108 // configure spi
dudmuck 0:f2716e543d97 109 spi.frequency(8000000);
dudmuck 0:f2716e543d97 110 spi.format(8, 0);
dudmuck 0:f2716e543d97 111 nss = 1;
dudmuck 0:f2716e543d97 112 //RFSwitch_CNTR_2 = 1;
dudmuck 0:f2716e543d97 113 #endif
dudmuck 0:f2716e543d97 114
dudmuck 0:f2716e543d97 115 set_time(0); // initialize RTC
dudmuck 0:f2716e543d97 116
dudmuck 0:f2716e543d97 117 /* Enable Ultra low power mode */
dudmuck 0:f2716e543d97 118 HAL_PWREx_EnableUltraLowPower();
dudmuck 0:f2716e543d97 119
dudmuck 0:f2716e543d97 120 /* Enable the fast wake up from Ultra low power mode */
dudmuck 0:f2716e543d97 121 HAL_PWREx_EnableFastWakeUp();
dudmuck 0:f2716e543d97 122
dudmuck 0:f2716e543d97 123 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RtcHandle, RTC_FLAG_WUTF);
dudmuck 0:f2716e543d97 124
dudmuck 0:f2716e543d97 125 NVIC_SetVector(RTC_WKUP_IRQn, (uint32_t)rtc_wkup_irq);
dudmuck 0:f2716e543d97 126 NVIC_EnableIRQ(RTC_WKUP_IRQn);
dudmuck 0:f2716e543d97 127
dudmuck 0:f2716e543d97 128 hdr_fem_ctx = 0;
dudmuck 0:f2716e543d97 129
dudmuck 0:f2716e543d97 130 hal_enableIRQs();
dudmuck 0:f2716e543d97 131
dudmuck 0:f2716e543d97 132 GPIOA->MODER |= 0x01415500; // unused pins as outputs: PA4, PA5, PA6, PA7, PA8, (PA11,PA12 USB)
dudmuck 0:f2716e543d97 133 GPIOB->MODER |= 0x00000401; // unused pins as outputs: PB0(HDR_DIO1), PB5 (PB10 pulled hi by LED), PB3-T_SWO
dudmuck 0:f2716e543d97 134 GPIOC->MODER |= 0x00000041; // unused pins as outputs: PC0(HDR_FEM_CSD), PC3(SPI3_enable)
dudmuck 0:f2716e543d97 135
dudmuck 0:f2716e543d97 136
dudmuck 0:f2716e543d97 137 }
dudmuck 0:f2716e543d97 138
dudmuck 0:f2716e543d97 139 u4_t hal_ticks ()
dudmuck 0:f2716e543d97 140 {
dudmuck 0:f2716e543d97 141 RTC_DateTypeDef dateStruct;
dudmuck 0:f2716e543d97 142 RTC_TimeTypeDef timeStruct;
dudmuck 0:f2716e543d97 143 struct tm timeinfo;
dudmuck 0:f2716e543d97 144 uint16_t sub_seconds;
dudmuck 0:f2716e543d97 145
dudmuck 0:f2716e543d97 146 RtcHandle.Instance = RTC;
dudmuck 0:f2716e543d97 147
dudmuck 0:f2716e543d97 148 // Read actual date and time
dudmuck 0:f2716e543d97 149 // Warning: the time must be read first!
dudmuck 0:f2716e543d97 150 HAL_RTC_GetTime(&RtcHandle, &timeStruct, FORMAT_BIN);
dudmuck 0:f2716e543d97 151 HAL_RTC_GetDate(&RtcHandle, &dateStruct, FORMAT_BIN);
dudmuck 0:f2716e543d97 152 sub_seconds = 16384 - timeStruct.SubSeconds; // RTC_SSR counts down
dudmuck 0:f2716e543d97 153
dudmuck 0:f2716e543d97 154 // Setup a tm structure based on the RTC
dudmuck 0:f2716e543d97 155 timeinfo.tm_wday = dateStruct.WeekDay;
dudmuck 0:f2716e543d97 156 timeinfo.tm_mon = dateStruct.Month - 1;
dudmuck 0:f2716e543d97 157 timeinfo.tm_mday = dateStruct.Date;
dudmuck 0:f2716e543d97 158 timeinfo.tm_year = dateStruct.Year + 100;
dudmuck 0:f2716e543d97 159 timeinfo.tm_hour = timeStruct.Hours;
dudmuck 0:f2716e543d97 160 timeinfo.tm_min = timeStruct.Minutes;
dudmuck 0:f2716e543d97 161 timeinfo.tm_sec = timeStruct.Seconds;
dudmuck 0:f2716e543d97 162
dudmuck 0:f2716e543d97 163 // Convert to timestamp
dudmuck 0:f2716e543d97 164 time_t t = mktime(&timeinfo);
dudmuck 0:f2716e543d97 165
dudmuck 0:f2716e543d97 166 t &= 0xffff;
dudmuck 0:f2716e543d97 167 // 14: SSR is driven at 16384Hz
dudmuck 0:f2716e543d97 168 return (t << 14) | sub_seconds;
dudmuck 0:f2716e543d97 169 }
dudmuck 0:f2716e543d97 170
dudmuck 0:f2716e543d97 171 void hal_waitUntil (u4_t time)
dudmuck 0:f2716e543d97 172 {
dudmuck 0:f2716e543d97 173 while (hal_ticks() < time)
dudmuck 0:f2716e543d97 174 asm("nop");
dudmuck 0:f2716e543d97 175 }
dudmuck 0:f2716e543d97 176
dudmuck 0:f2716e543d97 177
dudmuck 0:f2716e543d97 178 volatile char deep_sleep;
dudmuck 0:f2716e543d97 179 /* return 1 if target time is soon, return 0 if timer was programmed */
dudmuck 0:f2716e543d97 180 u1_t hal_checkTimer (u4_t time)
dudmuck 0:f2716e543d97 181 {
dudmuck 0:f2716e543d97 182 int d = time - hal_ticks();
dudmuck 0:f2716e543d97 183
dudmuck 0:f2716e543d97 184 HAL_RTCEx_DeactivateWakeUpTimer(&RtcHandle);
dudmuck 0:f2716e543d97 185 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RtcHandle, RTC_FLAG_WUTF);
dudmuck 0:f2716e543d97 186
dudmuck 0:f2716e543d97 187 if (d < 0x10000) { // less than 4s
dudmuck 0:f2716e543d97 188 deep_sleep = 0;
dudmuck 0:f2716e543d97 189 if (d < 4)
dudmuck 0:f2716e543d97 190 return 1; // very soon
dudmuck 0:f2716e543d97 191 if (d > ms2osticks(100)) {
dudmuck 0:f2716e543d97 192 d -= 13; // HSE_PLL startup time
dudmuck 0:f2716e543d97 193 deep_sleep = 1;
dudmuck 0:f2716e543d97 194 }
dudmuck 0:f2716e543d97 195 // 61.035us steps
dudmuck 0:f2716e543d97 196 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, d, RTC_WAKEUPCLOCK_RTCCLK_DIV2);
dudmuck 0:f2716e543d97 197 } else if (d < 0x20000) { // less than 8s
dudmuck 0:f2716e543d97 198 d -= 6; // HSE_PLL startup time
dudmuck 0:f2716e543d97 199 deep_sleep = 1;
dudmuck 0:f2716e543d97 200 // 122us steps
dudmuck 0:f2716e543d97 201 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, d >> 1, RTC_WAKEUPCLOCK_RTCCLK_DIV4);
dudmuck 0:f2716e543d97 202 } else if (d < 0x40000) { // less than 16s
dudmuck 0:f2716e543d97 203 deep_sleep = 1;
dudmuck 0:f2716e543d97 204 // 244us steps
dudmuck 0:f2716e543d97 205 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, d >> 2, RTC_WAKEUPCLOCK_RTCCLK_DIV8);
dudmuck 0:f2716e543d97 206 } else if (d < 0x80000) { // less than 32s
dudmuck 0:f2716e543d97 207 deep_sleep = 1;
dudmuck 0:f2716e543d97 208 // 488us steps
dudmuck 0:f2716e543d97 209 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, d >> 3, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
dudmuck 0:f2716e543d97 210 } else {
dudmuck 0:f2716e543d97 211 deep_sleep = 1;
dudmuck 0:f2716e543d97 212 // 1s steps to 18hours
dudmuck 0:f2716e543d97 213 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, d >> 14, RTC_WAKEUPCLOCK_CK_SPRE_16BITS);
dudmuck 0:f2716e543d97 214 /* RTC_WAKEUPCLOCK_CK_SPRE_17BITS: 18h to 36h */
dudmuck 0:f2716e543d97 215 /*for (;;)
dudmuck 0:f2716e543d97 216 asm("nop");*/
dudmuck 0:f2716e543d97 217 }
dudmuck 0:f2716e543d97 218
dudmuck 0:f2716e543d97 219 return 0;
dudmuck 0:f2716e543d97 220 }
dudmuck 0:f2716e543d97 221
dudmuck 0:f2716e543d97 222 //#define SLEEP_DEBUG 1
dudmuck 0:f2716e543d97 223
dudmuck 0:f2716e543d97 224 void hal_sleep ()
dudmuck 0:f2716e543d97 225 {
dudmuck 0:f2716e543d97 226 #ifdef SLEEP_DEBUG
dudmuck 0:f2716e543d97 227 u4_t start_tick, end_tick;
dudmuck 0:f2716e543d97 228 volatile uint32_t time_asleep;
dudmuck 0:f2716e543d97 229 #endif /* SLEEP_DEBUG */
dudmuck 0:f2716e543d97 230
dudmuck 0:f2716e543d97 231 #ifdef USE_DEBUGGER
dudmuck 0:f2716e543d97 232 HAL_EnableDBGStopMode();
dudmuck 0:f2716e543d97 233 if (!DBGMCU->CR & DBGMCU_CR_DBG_STOP)
dudmuck 0:f2716e543d97 234 for (;;) asm("nop");
dudmuck 0:f2716e543d97 235 #endif /* USE_DEBUGGER */
dudmuck 0:f2716e543d97 236
dudmuck 0:f2716e543d97 237 if (deep_sleep)
dudmuck 0:f2716e543d97 238 debug_done(); // wait here if debug still printing
dudmuck 0:f2716e543d97 239
dudmuck 0:f2716e543d97 240 if (__HAL_RTC_WAKEUPTIMER_GET_FLAG(&RtcHandle, RTC_FLAG_WUTF) == 0) {
dudmuck 0:f2716e543d97 241 // set gpio for sleep
dudmuck 0:f2716e543d97 242 #ifdef SLEEP_DEBUG
dudmuck 0:f2716e543d97 243 start_tick = hal_ticks();
dudmuck 0:f2716e543d97 244 #endif /* SLEEP_DEBUG */
dudmuck 0:f2716e543d97 245 hdr_fem_ctx = 1;
dudmuck 0:f2716e543d97 246
dudmuck 0:f2716e543d97 247 if (deep_sleep) {
dudmuck 0:f2716e543d97 248 #ifndef USE_DEBUGGER
dudmuck 0:f2716e543d97 249 /* PA13 to undriven JTMS/SWDIO pin (from AF0 to GPIO), and PA2 */
dudmuck 0:f2716e543d97 250 GPIOA->MODER &= 0xf7ffffdf;
dudmuck 0:f2716e543d97 251 GPIOB->MODER &= 0xffffdfff; // PB6 UART_TX to input
dudmuck 0:f2716e543d97 252 #endif
dudmuck 0:f2716e543d97 253 deepsleep(); // blocks until waking
dudmuck 0:f2716e543d97 254 #ifndef USE_DEBUGGER
dudmuck 0:f2716e543d97 255 /* PA13 back to JTMS/SWDIO pin (from GPIO to AF0), and PA2 */
dudmuck 0:f2716e543d97 256 GPIOA->MODER |= 0x08000020;
dudmuck 0:f2716e543d97 257 GPIOB->MODER |= 0x00002000; // PB6 input to UART_TX
dudmuck 0:f2716e543d97 258 #endif
dudmuck 0:f2716e543d97 259 } else
dudmuck 0:f2716e543d97 260 sleep(); // blocks until waking
dudmuck 0:f2716e543d97 261
dudmuck 0:f2716e543d97 262 hdr_fem_ctx = 0;
dudmuck 0:f2716e543d97 263 #ifdef SLEEP_DEBUG
dudmuck 0:f2716e543d97 264 end_tick = hal_ticks();
dudmuck 0:f2716e543d97 265 time_asleep = end_tick - start_tick;
dudmuck 0:f2716e543d97 266 printf("%d\r\n", time_asleep);
dudmuck 0:f2716e543d97 267 #endif /* SLEEP_DEBUG */
dudmuck 0:f2716e543d97 268 // restore gpio from sleep
dudmuck 0:f2716e543d97 269 }
dudmuck 0:f2716e543d97 270 }
dudmuck 0:f2716e543d97 271
dudmuck 0:f2716e543d97 272 void hal_pin_nss (u1_t val)
dudmuck 0:f2716e543d97 273 {
dudmuck 0:f2716e543d97 274 nss = val;
dudmuck 0:f2716e543d97 275 }
dudmuck 0:f2716e543d97 276
dudmuck 0:f2716e543d97 277 u1_t hal_spi (u1_t out)
dudmuck 0:f2716e543d97 278 {
dudmuck 0:f2716e543d97 279 return spi.write(out);
dudmuck 0:f2716e543d97 280 }
dudmuck 0:f2716e543d97 281
dudmuck 0:f2716e543d97 282 // 0=RX 1=TX
dudmuck 0:f2716e543d97 283 /*void hal_pin_rxtx (u1_t val)
dudmuck 0:f2716e543d97 284 {
dudmuck 0:f2716e543d97 285 rxtx = !val;
dudmuck 0:f2716e543d97 286 }*/
dudmuck 0:f2716e543d97 287 #define OPMODE_LORA 0x80
dudmuck 0:f2716e543d97 288 #define OPMODE_MASK 0x07
dudmuck 0:f2716e543d97 289 #define OPMODE_SLEEP 0x00
dudmuck 0:f2716e543d97 290 #define OPMODE_STANDBY 0x01
dudmuck 0:f2716e543d97 291 #define OPMODE_FSTX 0x02
dudmuck 0:f2716e543d97 292 #define OPMODE_TX 0x03
dudmuck 0:f2716e543d97 293 #define OPMODE_FSRX 0x04
dudmuck 0:f2716e543d97 294 #define OPMODE_RX 0x05
dudmuck 0:f2716e543d97 295 #define OPMODE_RX_SINGLE 0x06
dudmuck 0:f2716e543d97 296 #define OPMODE_CAD 0x07
dudmuck 0:f2716e543d97 297 void hal_opmode(u1_t mode, u1_t pa_boost)
dudmuck 0:f2716e543d97 298 {
dudmuck 0:f2716e543d97 299 if (mode == OPMODE_TX) { // start of transmission
dudmuck 0:f2716e543d97 300 // assuming always using PA_BOOST
dudmuck 0:f2716e543d97 301 if (pa_boost) {
dudmuck 0:f2716e543d97 302 rfsw2 = 0;
dudmuck 0:f2716e543d97 303 rfsw1 = 1;
dudmuck 0:f2716e543d97 304 } else {
dudmuck 0:f2716e543d97 305 rfsw2 = 1;
dudmuck 0:f2716e543d97 306 rfsw1 = 0;
dudmuck 0:f2716e543d97 307 }
dudmuck 0:f2716e543d97 308 } else if (mode == OPMODE_RX || mode == OPMODE_RX_SINGLE || mode == OPMODE_CAD) { // start of reception
dudmuck 0:f2716e543d97 309 rfsw2 = 1;
dudmuck 0:f2716e543d97 310 rfsw1 = 1;
dudmuck 0:f2716e543d97 311 } else { // RF switch shutdown
dudmuck 0:f2716e543d97 312 rfsw2 = 0;
dudmuck 0:f2716e543d97 313 rfsw1 = 0;
dudmuck 0:f2716e543d97 314 }
dudmuck 0:f2716e543d97 315 }
dudmuck 0:f2716e543d97 316
dudmuck 0:f2716e543d97 317 void hal_pin_rst (u1_t val)
dudmuck 0:f2716e543d97 318 {
dudmuck 0:f2716e543d97 319 if (val == 0 || val == 1) { // drive pin
dudmuck 0:f2716e543d97 320 rst.output();
dudmuck 0:f2716e543d97 321 rst = val;
dudmuck 0:f2716e543d97 322 } else { // keep pin floating
dudmuck 0:f2716e543d97 323 rst.input();
dudmuck 0:f2716e543d97 324 }
dudmuck 0:f2716e543d97 325 }
dudmuck 0:f2716e543d97 326