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| 1 | +/* |
| 2 | +* Copyright (c) 2020 - 2024 Renesas Electronics Corporation and/or its affiliates |
| 3 | +* |
| 4 | +* SPDX-License-Identifier: BSD-3-Clause |
| 5 | +*/ |
| 6 | + |
| 7 | +/*********************************************************************************************************************** |
| 8 | + * Includes <System Includes> , "Project Includes" |
| 9 | + **********************************************************************************************************************/ |
| 10 | +#include <stdint.h> |
| 11 | +#include "bsp_api.h" |
| 12 | + |
| 13 | +#if BSP_PRV_POWER_USE_DCDC |
| 14 | + |
| 15 | +/*********************************************************************************************************************** |
| 16 | + * Macro definitions |
| 17 | + **********************************************************************************************************************/ |
| 18 | + #define BSP_PRV_LDO_STABILIZATION_TIME_US (60U) |
| 19 | + |
| 20 | +/*********************************************************************************************************************** |
| 21 | + * Typedef definitions |
| 22 | + **********************************************************************************************************************/ |
| 23 | + |
| 24 | +/*********************************************************************************************************************** |
| 25 | + * Switch from DCDC to LDO. Requires LPM register protection and interrupts to be disabled. |
| 26 | + * |
| 27 | + * This function follows the procedure given in the RA2L1 User's Manual (R01UH0853EJ0100) Section 10.5.1 (4) "Switching |
| 28 | + * from High-speed/Middle-speed mode (DCDC power mode) to High-speed/Middle-speed mode (LDO power mode)" |
| 29 | + **********************************************************************************************************************/ |
| 30 | +static inline void bsp_power_dcdc_disable (bsp_power_mode_t mode) |
| 31 | +{ |
| 32 | + /* Save all module stop bits, then stop all peripherals. */ |
| 33 | + uint32_t mstpcrb = R_MSTP->MSTPCRB; |
| 34 | + R_MSTP->MSTPCRB = UINT32_MAX; |
| 35 | + uint32_t mstpcrc = R_MSTP->MSTPCRC; |
| 36 | + R_MSTP->MSTPCRC = UINT32_MAX; |
| 37 | + uint32_t mstpcrd = R_MSTP->MSTPCRD; |
| 38 | + R_MSTP->MSTPCRD = UINT32_MAX; |
| 39 | + |
| 40 | + /* Switch to LDO. */ |
| 41 | + R_SYSTEM->DCDCCTL = (uint8_t) mode; |
| 42 | + |
| 43 | + /* Wait for LDO to stabilize. */ |
| 44 | + R_BSP_SoftwareDelay(BSP_PRV_LDO_STABILIZATION_TIME_US, BSP_DELAY_UNITS_MICROSECONDS); |
| 45 | + |
| 46 | + /* Restore all module stop bits. */ |
| 47 | + R_MSTP->MSTPCRB = mstpcrb; |
| 48 | + R_MSTP->MSTPCRC = mstpcrc; |
| 49 | + R_MSTP->MSTPCRD = mstpcrd; |
| 50 | +} |
| 51 | + |
| 52 | +/*********************************************************************************************************************** |
| 53 | + * Switch from LDO to DCDC. Requires LPM register protection and interrupts to be disabled. |
| 54 | + * |
| 55 | + * This function follows the procedure given in the RA2L1 User's Manual (R01UH0853EJ0100) Section 10.5.1 (3) "Switching |
| 56 | + * from the High-Speed/Middle-Speed mode (LDO power mode) to the High-speed/Middle speed mode (DCDC power mode)" |
| 57 | + **********************************************************************************************************************/ |
| 58 | +static inline void bsp_power_dcdc_enable (void) |
| 59 | +{ |
| 60 | + /* Enable DCDC IO buffer. */ |
| 61 | + uint8_t dcdcctl = R_SYSTEM->DCDCCTL | R_SYSTEM_DCDCCTL_STOPZA_Msk; |
| 62 | + R_SYSTEM->DCDCCTL = dcdcctl; |
| 63 | + |
| 64 | + /* Turn on DCDC Vref. */ |
| 65 | + R_SYSTEM->DCDCCTL = dcdcctl & (uint8_t) (~R_SYSTEM_DCDCCTL_PD_Msk); |
| 66 | + |
| 67 | + /* Wait for Vref to stabilize. */ |
| 68 | + R_BSP_SoftwareDelay(10, BSP_DELAY_UNITS_MICROSECONDS); |
| 69 | + |
| 70 | + /* Switch DCDC Vref to low-power mode. */ |
| 71 | + R_SYSTEM->DCDCCTL = 0x10; |
| 72 | + |
| 73 | + /* Wait for Vref to stabilize. */ |
| 74 | + R_BSP_SoftwareDelay(10, BSP_DELAY_UNITS_MICROSECONDS); |
| 75 | + |
| 76 | + /* Turn off LDO and turn on DCDC. */ |
| 77 | + R_SYSTEM->DCDCCTL = 0x11; |
| 78 | + |
| 79 | + /* Wait for DCDC to stabilize. */ |
| 80 | + R_BSP_SoftwareDelay(2, BSP_DELAY_UNITS_MICROSECONDS); |
| 81 | + |
| 82 | + /* Enable DCDC overcurrent protection. */ |
| 83 | + R_SYSTEM->DCDCCTL = 0x13; |
| 84 | +} |
| 85 | + |
| 86 | +/*******************************************************************************************************************//** |
| 87 | + * @addtogroup BSP_MCU_RA2L1 |
| 88 | + * @{ |
| 89 | + **********************************************************************************************************************/ |
| 90 | + |
| 91 | +/*******************************************************************************************************************//** |
| 92 | + * Select either the LDO or DCDC regulator and/or update the MCU supply voltage range. Returns the previously selected |
| 93 | + * mode. |
| 94 | + * |
| 95 | + * @note DCDC mode has the following limitations: |
| 96 | + * - Supply voltage must be 2.4V or greater |
| 97 | + * - Low- and Subosc-speed modes are not available |
| 98 | + * - Software Standby is not available |
| 99 | + * Ensure these limitations are respected before entering DCDC mode. If supply voltage may drop below 2.4V during |
| 100 | + * operation, configure a LVD channel to interrupt or reset the MCU near this threshold to switch back to the LDO. |
| 101 | + * |
| 102 | + * @note Switching to DCDC mode temporarily disables all interrupts and blocks for 22 microseconds; switching to LDO |
| 103 | + * from DCDC temporarily disables all peripherals and interrupts and blocks for 60 microseconds. |
| 104 | + * |
| 105 | + * @note If the supply voltage falls outside the range originally specified when starting the DCDC regulator, call this |
| 106 | + * function again with the updated supply voltage. |
| 107 | + * |
| 108 | + * @return The previously selected power mode. |
| 109 | + **********************************************************************************************************************/ |
| 110 | +bsp_power_mode_t R_BSP_PowerModeSet (bsp_power_mode_t mode) |
| 111 | +{ |
| 112 | + /* Get current mode to return to caller. */ |
| 113 | + bsp_power_mode_t previous_mode = R_SYSTEM->DCDCCTL & R_SYSTEM_DCDCCTL_DCDCON_Msk ? |
| 114 | + (bsp_power_mode_t) R_SYSTEM->VCCSEL : BSP_POWER_MODE_LDO; |
| 115 | + |
| 116 | + /* Enable writing to Low Power Mode registers. */ |
| 117 | + R_BSP_RegisterProtectDisable(BSP_REG_PROTECT_OM_LPC_BATT); |
| 118 | + |
| 119 | + /* Set VCCSEL if a DCDC mode is selected. */ |
| 120 | + bool dcdc_mode = mode < BSP_POWER_MODE_LDO; |
| 121 | + if (dcdc_mode) |
| 122 | + { |
| 123 | + /* Set supply voltage range. */ |
| 124 | + R_SYSTEM->VCCSEL = (uint8_t) mode; |
| 125 | + } |
| 126 | + |
| 127 | + /* Only change mode if the specified mode is not already set. */ |
| 128 | + if (dcdc_mode != (previous_mode < BSP_POWER_MODE_LDO)) |
| 129 | + { |
| 130 | + /* Enter critical section to prevent any peripheral or power mode changes while transitioning. */ |
| 131 | + FSP_CRITICAL_SECTION_DEFINE; |
| 132 | + FSP_CRITICAL_SECTION_ENTER; |
| 133 | + |
| 134 | + if (mode >= BSP_POWER_MODE_LDO) |
| 135 | + { |
| 136 | + bsp_power_dcdc_disable(mode); |
| 137 | + } |
| 138 | + else |
| 139 | + { |
| 140 | + bsp_power_dcdc_enable(); |
| 141 | + } |
| 142 | + |
| 143 | + FSP_CRITICAL_SECTION_EXIT; |
| 144 | + } |
| 145 | + |
| 146 | + /* Disable writing to Low Power Mode registers. */ |
| 147 | + R_BSP_RegisterProtectEnable(BSP_REG_PROTECT_OM_LPC_BATT); |
| 148 | + |
| 149 | + return previous_mode; |
| 150 | +} |
| 151 | + |
| 152 | +/*******************************************************************************************************************//** |
| 153 | + * @} (end addtogroup BSP_MCU_RA2L1) |
| 154 | + **********************************************************************************************************************/ |
| 155 | + |
| 156 | +#endif /* BSP_PRV_POWER_USE_DCDC */ |
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