1 // Copyright 2021 Espressif Systems (Shanghai) PTE LTD 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 #pragma once 15 16 #define HAL_SWAP16(d) __builtin_bswap16((d)) 17 #define HAL_SWAP32(d) __builtin_bswap32((d)) 18 #define HAL_SWAP64(d) __builtin_bswap64((d)) 19 20 /** @cond */ //Doxy command to hide preprocessor definitions from docs */ 21 22 /** 23 * @brief Macro to force a 32-bit read, modify, then write on a peripheral register 24 * 25 * Due to a GCC bug, the compiler may still try to optimize read/writes to peripheral register fields by using 8/16 bit 26 * access, even if they are marked volatile (i.e., -fstrict-volatile-bitfields has no effect). 27 * 28 * For ESP chips, the peripheral bus only allows 32-bit read/writes. The following macro works around the compiler issue 29 * by forcing a 32-bit read/modify/write. 30 * 31 * @note This macro should only be called on register fields of xxx_struct.h type headers, as it depends on the presence 32 * of a 'val' field of the register union. 33 * @note Current implementation reads into a uint32_t instead of copy base_reg direclty to temp_reg. The reason being 34 * that C++ does not create a copy constructor for volatile structs. 35 */ 36 #define HAL_FORCE_MODIFY_U32_REG_FIELD(base_reg, reg_field, field_val) \ 37 { \ 38 uint32_t temp_val = base_reg.val; \ 39 __typeof__(base_reg) temp_reg; \ 40 temp_reg.val = temp_val; \ 41 temp_reg.reg_field = (field_val); \ 42 (base_reg).val = temp_reg.val; \ 43 } 44 45 /** 46 * @brief Macro to force a 32-bit read on a peripheral register 47 * 48 * @note This macro should only be called on register fields of xxx_struct.h type headers. See description above for 49 * more details. 50 * @note Current implementation reads into a uint32_t. See description above for more details. 51 */ 52 #define HAL_FORCE_READ_U32_REG_FIELD(base_reg, reg_field) ({ \ 53 uint32_t temp_val = base_reg.val; \ 54 __typeof__(base_reg) temp_reg; \ 55 temp_reg.val = temp_val; \ 56 temp_reg.reg_field; \ 57 }) 58 59 /** @endcond */ 60
