mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_STM/TARGET_STM32L1/TARGET_XDOT_L151CC/xdot_low_power.c@168:9672193075cf, 2017-07-06 (annotated)

Committer:
AnnaBridge
Date:
Thu Jul 06 15:42:05 2017 +0100
Revision:
168:9672193075cf
Parent:
149:156823d33999
Child:
173:e131a1973e81
This updates the lib to the mbed lib v 146

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 148:21d94c44109e 1 /* mbed Microcontroller Library
<> 148:21d94c44109e 2 *******************************************************************************
<> 148:21d94c44109e 3 * Copyright (c) 2016, MultiTech Systems
<> 148:21d94c44109e 4 * All rights reserved.
<> 148:21d94c44109e 5 *
<> 148:21d94c44109e 6 * Redistribution and use in source and binary forms, with or without
<> 148:21d94c44109e 7 * modification, are permitted provided that the following conditions are met:
<> 148:21d94c44109e 8 *
<> 148:21d94c44109e 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 148:21d94c44109e 10 * this list of conditions and the following disclaimer.
<> 148:21d94c44109e 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 148:21d94c44109e 12 * this list of conditions and the following disclaimer in the documentation
<> 148:21d94c44109e 13 * and/or other materials provided with the distribution.
<> 148:21d94c44109e 14 * 3. Neither the name of MultiTech nor the names of its contributors
<> 148:21d94c44109e 15 * may be used to endorse or promote products derived from this software
<> 148:21d94c44109e 16 * without specific prior written permission.
<> 148:21d94c44109e 17 *
<> 148:21d94c44109e 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 148:21d94c44109e 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 148:21d94c44109e 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 148:21d94c44109e 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 148:21d94c44109e 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 148:21d94c44109e 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 148:21d94c44109e 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 148:21d94c44109e 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 148:21d94c44109e 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 148:21d94c44109e 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 148:21d94c44109e 28 *******************************************************************************
<> 148:21d94c44109e 29 */
<> 148:21d94c44109e 30
<> 148:21d94c44109e 31 #include "xdot_low_power.h"
<> 148:21d94c44109e 32 #include "stdio.h"
<> 148:21d94c44109e 33
<> 148:21d94c44109e 34 static uint32_t portA[6];
<> 148:21d94c44109e 35 static uint32_t portB[6];
<> 148:21d94c44109e 36 static uint32_t portC[6];
<> 148:21d94c44109e 37 static uint32_t portH[6];
<> 148:21d94c44109e 38
<> 148:21d94c44109e 39 void xdot_disable_systick_int() {
<> 148:21d94c44109e 40 SysTick->CTRL &= ~SysTick_CTRL_TICKINT_Msk;
<> 148:21d94c44109e 41 }
<> 148:21d94c44109e 42
<> 148:21d94c44109e 43 void xdot_enable_systick_int() {
<> 148:21d94c44109e 44 SysTick->CTRL |= SysTick_CTRL_TICKINT_Msk;
<> 148:21d94c44109e 45 }
<> 148:21d94c44109e 46
<> 148:21d94c44109e 47 void xdot_save_gpio_state() {
<> 148:21d94c44109e 48 portA[0] = GPIOA->MODER;
<> 148:21d94c44109e 49 portA[1] = GPIOA->OTYPER;
<> 148:21d94c44109e 50 portA[2] = GPIOA->OSPEEDR;
<> 148:21d94c44109e 51 portA[3] = GPIOA->PUPDR;
<> 148:21d94c44109e 52 portA[4] = GPIOA->AFR[0];
<> 148:21d94c44109e 53 portA[5] = GPIOA->AFR[1];
<> 148:21d94c44109e 54
<> 148:21d94c44109e 55 portB[0] = GPIOB->MODER;
<> 148:21d94c44109e 56 portB[1] = GPIOB->OTYPER;
<> 148:21d94c44109e 57 portB[2] = GPIOB->OSPEEDR;
<> 148:21d94c44109e 58 portB[3] = GPIOB->PUPDR;
<> 148:21d94c44109e 59 portB[4] = GPIOB->AFR[0];
<> 148:21d94c44109e 60 portB[5] = GPIOB->AFR[1];
<> 148:21d94c44109e 61
<> 148:21d94c44109e 62 portC[0] = GPIOC->MODER;
<> 148:21d94c44109e 63 portC[1] = GPIOC->OTYPER;
<> 148:21d94c44109e 64 portC[2] = GPIOC->OSPEEDR;
<> 148:21d94c44109e 65 portC[3] = GPIOC->PUPDR;
<> 148:21d94c44109e 66 portC[4] = GPIOC->AFR[0];
<> 148:21d94c44109e 67 portC[5] = GPIOC->AFR[1];
<> 148:21d94c44109e 68
<> 148:21d94c44109e 69 portH[0] = GPIOH->MODER;
<> 148:21d94c44109e 70 portH[1] = GPIOH->OTYPER;
<> 148:21d94c44109e 71 portH[2] = GPIOH->OSPEEDR;
<> 148:21d94c44109e 72 portH[3] = GPIOH->PUPDR;
<> 148:21d94c44109e 73 portH[4] = GPIOH->AFR[0];
<> 148:21d94c44109e 74 portH[5] = GPIOH->AFR[1];
<> 148:21d94c44109e 75 }
<> 148:21d94c44109e 76
<> 148:21d94c44109e 77 void xdot_restore_gpio_state() {
<> 148:21d94c44109e 78 GPIOA->MODER = portA[0];
<> 148:21d94c44109e 79 GPIOA->OTYPER = portA[1];
<> 148:21d94c44109e 80 GPIOA->OSPEEDR = portA[2];
<> 148:21d94c44109e 81 GPIOA->PUPDR = portA[3];
<> 148:21d94c44109e 82 GPIOA->AFR[0] = portA[4];
<> 148:21d94c44109e 83 GPIOA->AFR[1] = portA[5];
<> 148:21d94c44109e 84
<> 148:21d94c44109e 85 GPIOB->MODER = portB[0];
<> 148:21d94c44109e 86 GPIOB->OTYPER = portB[1];
<> 148:21d94c44109e 87 GPIOB->OSPEEDR = portB[2];
<> 148:21d94c44109e 88 GPIOB->PUPDR = portB[3];
<> 148:21d94c44109e 89 GPIOB->AFR[0] = portB[4];
<> 148:21d94c44109e 90 GPIOB->AFR[1] = portB[5];
<> 148:21d94c44109e 91
<> 148:21d94c44109e 92 GPIOC->MODER = portC[0];
<> 148:21d94c44109e 93 GPIOC->OTYPER = portC[1];
<> 148:21d94c44109e 94 GPIOC->OSPEEDR = portC[2];
<> 148:21d94c44109e 95 GPIOC->PUPDR = portC[3];
<> 148:21d94c44109e 96 GPIOC->AFR[0] = portC[4];
<> 148:21d94c44109e 97 GPIOC->AFR[1] = portC[5];
<> 148:21d94c44109e 98
<> 148:21d94c44109e 99 GPIOH->MODER = portH[0];
<> 148:21d94c44109e 100 GPIOH->OTYPER = portH[1];
<> 148:21d94c44109e 101 GPIOH->OSPEEDR = portH[2];
<> 148:21d94c44109e 102 GPIOH->PUPDR = portH[3];
<> 148:21d94c44109e 103 GPIOH->AFR[0] = portH[4];
<> 148:21d94c44109e 104 GPIOH->AFR[1] = portH[5];
<> 148:21d94c44109e 105 }
<> 148:21d94c44109e 106
<> 148:21d94c44109e 107 void xdot_enter_stop_mode() {
<> 148:21d94c44109e 108 GPIO_InitTypeDef GPIO_InitStruct;
<> 148:21d94c44109e 109
<> 148:21d94c44109e 110 // disable ADC and DAC - they can consume power in stop mode
<> 148:21d94c44109e 111 ADC1->CR2 &= ~ADC_CR2_ADON;
<> 148:21d94c44109e 112 ADC->CCR &= ~ADC_CCR_TSVREFE;
<> 148:21d94c44109e 113 DAC->CR &= ~DAC_CR_EN1;
<> 148:21d94c44109e 114 DAC->CR &= ~DAC_CR_EN2;
<> 148:21d94c44109e 115
<> 148:21d94c44109e 116 // enable ULP and enable fast wakeup
<> 148:21d94c44109e 117 HAL_PWREx_EnableUltraLowPower();
<> 148:21d94c44109e 118 HAL_PWREx_EnableFastWakeUp();
<> 148:21d94c44109e 119
<> 148:21d94c44109e 120 // disable HSI, MSI, and LSI if they are running
<> 148:21d94c44109e 121 if (RCC->CR & RCC_CR_HSION) {
<> 148:21d94c44109e 122 RCC->CR &= ~RCC_CR_HSION;
<> 148:21d94c44109e 123 }
<> 148:21d94c44109e 124 if (RCC->CR & RCC_CR_MSION) {
<> 148:21d94c44109e 125 RCC->CR &= ~RCC_CR_MSION;
<> 148:21d94c44109e 126 }
<> 148:21d94c44109e 127 if (RCC->CSR & RCC_CSR_LSION) {
<> 148:21d94c44109e 128 RCC->CSR &= ~RCC_CSR_LSION;
<> 148:21d94c44109e 129 }
<> 148:21d94c44109e 130
<> 148:21d94c44109e 131 // configure USBTX & USBRX, LORA SPI, LORA_DIO, LORA_RESET, Secure Element, crystal pins, and SWD pins to analog nopull
<> 148:21d94c44109e 132 // the application must do the same with WAKE, GPIO*, UART1_*, I2C_*, and SPI_*
<> 148:21d94c44109e 133
<> 148:21d94c44109e 134 // GPIO Ports Clock Enable
<> 148:21d94c44109e 135 __GPIOA_CLK_ENABLE();
<> 148:21d94c44109e 136 __GPIOB_CLK_ENABLE();
<> 148:21d94c44109e 137 __GPIOC_CLK_ENABLE();
<> 148:21d94c44109e 138 __GPIOH_CLK_ENABLE();
<> 148:21d94c44109e 139
<> 148:21d94c44109e 140 // USBTX & USBRX to analog nopull
<> 148:21d94c44109e 141 GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
<> 148:21d94c44109e 142 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 143 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 144 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
<> 148:21d94c44109e 145
<> 148:21d94c44109e 146 // LORA_RESET to analog nopull
<> 148:21d94c44109e 147 GPIO_InitStruct.Pin = GPIO_PIN_1;
<> 148:21d94c44109e 148 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 149 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 150 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
<> 148:21d94c44109e 151
<> 148:21d94c44109e 152 // LORA_MISO to analog nopull
<> 148:21d94c44109e 153 GPIO_InitStruct.Pin = GPIO_PIN_4;
<> 148:21d94c44109e 154 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 155 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 156 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
<> 148:21d94c44109e 157
<> 148:21d94c44109e 158 // LORA_SCK & LORA_MOSI to input pulldown - additional current draw if left floating
<> 148:21d94c44109e 159 GPIO_InitStruct.Pin = GPIO_PIN_3 | GPIO_PIN_5;
<> 148:21d94c44109e 160 GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
<> 148:21d94c44109e 161 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
<> 148:21d94c44109e 162 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
<> 148:21d94c44109e 163
<> 148:21d94c44109e 164 // LORA_NSS to analog nopull
<> 148:21d94c44109e 165 GPIO_InitStruct.Pin = GPIO_PIN_15;
<> 148:21d94c44109e 166 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 167 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 168 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
<> 148:21d94c44109e 169
<> 148:21d94c44109e 170 // LORA_DIO0 - LORA_DIO2 to analog nopull
<> 148:21d94c44109e 171 GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8;
<> 148:21d94c44109e 172 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 173 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 174 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
<> 148:21d94c44109e 175
<> 148:21d94c44109e 176 // LORA_DIO3 - LORA_DIO4 to analog nopull
<> 148:21d94c44109e 177 GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
<> 148:21d94c44109e 178 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 179 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 180 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
<> 148:21d94c44109e 181
<> 148:21d94c44109e 182 // SE_CTRL, SE_IO, & SE_CLK to analog nopull
<> 148:21d94c44109e 183 GPIO_InitStruct.Pin = GPIO_PIN_1 | GPIO_PIN_10 | GPIO_PIN_11;
<> 148:21d94c44109e 184 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 185 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 186 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
<> 148:21d94c44109e 187
<> 148:21d94c44109e 188 // SE_RESET to analog nopull
<> 148:21d94c44109e 189 GPIO_InitStruct.Pin = GPIO_PIN_13;
<> 148:21d94c44109e 190 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 191 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 192 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
<> 148:21d94c44109e 193
<> 148:21d94c44109e 194 // SWDIO & SWCLK to analog nopull
<> 148:21d94c44109e 195 GPIO_InitStruct.Pin = GPIO_PIN_13 | GPIO_PIN_14;
<> 148:21d94c44109e 196 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 197 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 198 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
<> 148:21d94c44109e 199
<> 148:21d94c44109e 200 // OSC32_IN & OSC32_OUT to analog nopull
<> 148:21d94c44109e 201 GPIO_InitStruct.Pin = GPIO_PIN_14 | GPIO_PIN_15;
<> 148:21d94c44109e 202 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 203 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 204 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
<> 148:21d94c44109e 205
<> 148:21d94c44109e 206 // OSC_IN & OSC_OUT to analog nopull
<> 148:21d94c44109e 207 GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
<> 148:21d94c44109e 208 GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
<> 148:21d94c44109e 209 GPIO_InitStruct.Pull = GPIO_NOPULL;
<> 148:21d94c44109e 210 HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
<> 148:21d94c44109e 211
<> 148:21d94c44109e 212 // done configuring pins to analog nopull
<> 148:21d94c44109e 213
<> 148:21d94c44109e 214 // make sure wakeup flag is cleared
<> 148:21d94c44109e 215 PWR->CR |= PWR_CR_CWUF;
<> 148:21d94c44109e 216
<> 148:21d94c44109e 217 // enter stop mode - don't execute past here until woken up
<> 148:21d94c44109e 218 HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
<> 148:21d94c44109e 219
<> 148:21d94c44109e 220 RCC_ClkInitTypeDef RCC_ClkInitStruct;
AnnaBridge 168:9672193075cf 221 RCC_OscInitTypeDef HSERCC_OscInitStruct;
<> 148:21d94c44109e 222 /* Enable HSE and HSI48 oscillators and activate PLL with HSE as source */
AnnaBridge 168:9672193075cf 223 HSERCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI;
AnnaBridge 168:9672193075cf 224 HSERCC_OscInitStruct.HSEState = RCC_HSE_ON; /* External 24 MHz xtal on OSC_IN/OSC_OUT */
AnnaBridge 168:9672193075cf 225 HSERCC_OscInitStruct.HSIState = RCC_HSI_OFF;
<> 148:21d94c44109e 226 // SYSCLK = 32 MHz ((24 MHz * 4) / 3)
<> 148:21d94c44109e 227 // USBCLK = 48 MHz ((24 MHz * 4) / 2) --> USB OK
AnnaBridge 168:9672193075cf 228 HSERCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
AnnaBridge 168:9672193075cf 229 HSERCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
AnnaBridge 168:9672193075cf 230 HSERCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL4;
AnnaBridge 168:9672193075cf 231 HSERCC_OscInitStruct.PLL.PLLDIV = RCC_PLL_DIV3;
AnnaBridge 168:9672193075cf 232 if (HAL_RCC_OscConfig(&HSERCC_OscInitStruct) != HAL_OK) {
<> 148:21d94c44109e 233 printf("OSC initialization failed - initiating soft reset\r\n");
<> 148:21d94c44109e 234 NVIC_SystemReset();
<> 148:21d94c44109e 235 }
<> 148:21d94c44109e 236
<> 148:21d94c44109e 237 /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
<> 148:21d94c44109e 238 RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
<> 148:21d94c44109e 239 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 32 MHz
<> 148:21d94c44109e 240 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 32 MHz
<> 148:21d94c44109e 241 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 32 MHz
<> 148:21d94c44109e 242 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 32 MHz
<> 148:21d94c44109e 243 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
<> 148:21d94c44109e 244 printf("PLL initialization failed - initiating soft reset\r\n");
<> 148:21d94c44109e 245 NVIC_SystemReset();
<> 148:21d94c44109e 246 }
<> 148:21d94c44109e 247
AnnaBridge 168:9672193075cf 248 /* Enable the HSI for ADC peripherals */
AnnaBridge 168:9672193075cf 249 RCC_OscInitTypeDef HSIRCC_OscInitStruct;
AnnaBridge 168:9672193075cf 250 HAL_RCC_GetOscConfig(&HSIRCC_OscInitStruct);
AnnaBridge 168:9672193075cf 251 if ( HSIRCC_OscInitStruct.HSIState != RCC_HSI_ON ) {
AnnaBridge 168:9672193075cf 252 HSIRCC_OscInitStruct.HSIState = RCC_HSI_ON;
AnnaBridge 168:9672193075cf 253 HSIRCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
AnnaBridge 168:9672193075cf 254 HSIRCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
AnnaBridge 168:9672193075cf 255 HAL_StatusTypeDef ret = HAL_RCC_OscConfig(&HSIRCC_OscInitStruct);
AnnaBridge 168:9672193075cf 256 if ( ret != HAL_OK ) {
AnnaBridge 168:9672193075cf 257 printf("HSI initialization failed - ADC will not function properly\r\n");
AnnaBridge 168:9672193075cf 258 }
AnnaBridge 168:9672193075cf 259 }
AnnaBridge 168:9672193075cf 260
<> 148:21d94c44109e 261 SystemCoreClockUpdate();
<> 148:21d94c44109e 262
<> 148:21d94c44109e 263 // clear wakeup flag in power control register
<> 148:21d94c44109e 264 PWR->CR |= PWR_CR_CWUF;
<> 148:21d94c44109e 265
<> 148:21d94c44109e 266 // enable the ADC and DAC
<> 148:21d94c44109e 267 ADC->CCR |= ADC_CCR_TSVREFE;
<> 148:21d94c44109e 268 ADC1->CR2 |= ADC_CR2_ADON;
<> 148:21d94c44109e 269 DAC->CR |= DAC_CR_EN1;
<> 148:21d94c44109e 270 DAC->CR |= DAC_CR_EN2;
<> 148:21d94c44109e 271 }
<> 148:21d94c44109e 272
<> 148:21d94c44109e 273 void xdot_enter_standby_mode() {
<> 148:21d94c44109e 274 // enable ULP and enable fast wakeup
<> 148:21d94c44109e 275 HAL_PWREx_EnableUltraLowPower();
<> 148:21d94c44109e 276 HAL_PWREx_EnableFastWakeUp();
<> 148:21d94c44109e 277
<> 148:21d94c44109e 278 // disable HSI, MSI, and LSI if they are running
<> 148:21d94c44109e 279 if (RCC->CR & RCC_CR_HSION)
<> 148:21d94c44109e 280 RCC->CR &= ~RCC_CR_HSION;
<> 148:21d94c44109e 281 if (RCC->CR & RCC_CR_MSION)
<> 148:21d94c44109e 282 RCC->CR &= ~RCC_CR_MSION;
<> 148:21d94c44109e 283 if (RCC->CSR & RCC_CSR_LSION)
<> 148:21d94c44109e 284 RCC->CSR &= ~RCC_CSR_LSION;
<> 148:21d94c44109e 285
<> 148:21d94c44109e 286
<> 148:21d94c44109e 287 // make sure wakeup and standby flags are cleared
<> 148:21d94c44109e 288 PWR->CR |= PWR_CR_CWUF;
<> 148:21d94c44109e 289 PWR->CR |= PWR_CR_CSBF;
<> 148:21d94c44109e 290
<> 148:21d94c44109e 291 // enter standby mode
<> 148:21d94c44109e 292 HAL_PWR_EnterSTANDBYMode();
<> 148:21d94c44109e 293 }
<> 148:21d94c44109e 294
<> 148:21d94c44109e 295 void xdot_enable_standby_wake_pin() {
<> 148:21d94c44109e 296 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
<> 148:21d94c44109e 297 }
<> 148:21d94c44109e 298
<> 148:21d94c44109e 299 void xdot_disable_standby_wake_pin() {
<> 148:21d94c44109e 300 HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
<> 148:21d94c44109e 301 }
<> 148:21d94c44109e 302