202 lines
8.6 KiB
C
202 lines
8.6 KiB
C
// Copyright 2010-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _DPORT_ACCESS_H_
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#define _DPORT_ACCESS_H_
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#include <stdint.h>
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#include "esp_attr.h"
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#include "esp32/dport_access.h"
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#include "soc.h"
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#include "uart_reg.h"
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#include "xtensa/xtruntime.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//Registers Operation {{
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// The _DPORT_xxx register read macros access DPORT memory directly (as opposed to
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// DPORT_REG_READ which applies SMP-safe protections).
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//
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// There are several ways to read the DPORT registers:
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// 1) Use DPORT_REG_READ versions to be SMP-safe in IDF apps.
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// This method uses the pre-read APB implementation(*) without stall other CPU.
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// This is beneficial for single readings.
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// 2) If you want to make a sequence of DPORT reads to buffer,
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// use dport_read_buffer(buff_out, address, num_words),
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// it is the faster method and it doesn't stop other CPU.
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// 3) If you want to make a sequence of DPORT reads, but you don't want to stop other CPU
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// and you want to do it faster then you need use DPORT_SEQUENCE_REG_READ().
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// The difference from the first is that the user himself must disable interrupts while DPORT reading.
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// Note that disable interrupt need only if the chip has two cores.
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// 4) If you want to make a sequence of DPORT reads,
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// use DPORT_STALL_OTHER_CPU_START() macro explicitly
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// and then use _DPORT_REG_READ macro while other CPU is stalled.
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// After completing read operations, use DPORT_STALL_OTHER_CPU_END().
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// This method uses stall other CPU while reading DPORT registers.
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// Useful for compatibility, as well as for large consecutive readings.
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// This method is slower, but must be used if ROM functions or
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// other code is called which accesses DPORT without any other workaround.
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// *) The pre-readable APB register before reading the DPORT register
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// helps synchronize the operation of the two CPUs,
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// so that reading on different CPUs no longer causes random errors APB register.
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// _DPORT_REG_WRITE & DPORT_REG_WRITE are equivalent.
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#define _DPORT_REG_READ(_r) (*(volatile uint32_t *)(_r))
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#define _DPORT_REG_WRITE(_r, _v) (*(volatile uint32_t *)(_r)) = (_v)
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// Write value to DPORT register (does not require protecting)
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#define DPORT_REG_WRITE(_r, _v) _DPORT_REG_WRITE((_r), (_v))
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/**
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* @brief Read value from register, SMP-safe version.
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*
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* This method uses the pre-reading of the APB register before reading the register of the DPORT.
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* This implementation is useful for reading DORT registers for single reading without stall other CPU.
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* There is disable/enable interrupt.
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*
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* @param reg Register address
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* @return Value
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*/
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static inline uint32_t IRAM_ATTR DPORT_REG_READ(uint32_t reg)
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{
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#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
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return _DPORT_REG_READ(reg);
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#else
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return esp_dport_access_reg_read(reg);
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#endif
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}
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/**
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* @brief Read value from register, NOT SMP-safe version.
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*
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* This method uses the pre-reading of the APB register before reading the register of the DPORT.
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* There is not disable/enable interrupt.
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* The difference from DPORT_REG_READ() is that the user himself must disable interrupts while DPORT reading.
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* This implementation is useful for reading DORT registers in loop without stall other CPU. Note the usage example.
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* The recommended way to read registers sequentially without stall other CPU
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* is to use the method esp_dport_read_buffer(buff_out, address, num_words). It allows you to read registers in the buffer.
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*
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* \code{c}
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* // This example shows how to use it.
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* { // Use curly brackets to limit the visibility of variables in macros DPORT_INTERRUPT_DISABLE/RESTORE.
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* DPORT_INTERRUPT_DISABLE(); // Disable interrupt only on current CPU.
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* for (i = 0; i < max; ++i) {
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* array[i] = DPORT_SEQUENCE_REG_READ(Address + i * 4); // reading DPORT registers
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* }
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* DPORT_INTERRUPT_RESTORE(); // restore the previous interrupt level
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* }
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* \endcode
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*
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* @param reg Register address
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* @return Value
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*/
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static inline uint32_t IRAM_ATTR DPORT_SEQUENCE_REG_READ(uint32_t reg)
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{
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#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
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return _DPORT_REG_READ(reg);
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#else
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return esp_dport_access_sequence_reg_read(reg);
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#endif
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}
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//get bit or get bits from register
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#define DPORT_REG_GET_BIT(_r, _b) (DPORT_REG_READ(_r) & (_b))
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//set bit or set bits to register
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#define DPORT_REG_SET_BIT(_r, _b) DPORT_REG_WRITE((_r), (DPORT_REG_READ(_r)|(_b)))
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//clear bit or clear bits of register
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#define DPORT_REG_CLR_BIT(_r, _b) DPORT_REG_WRITE((_r), (DPORT_REG_READ(_r) & (~(_b))))
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//set bits of register controlled by mask
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#define DPORT_REG_SET_BITS(_r, _b, _m) DPORT_REG_WRITE((_r), ((DPORT_REG_READ(_r) & (~(_m))) | ((_b) & (_m))))
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//get field from register, uses field _S & _V to determine mask
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#define DPORT_REG_GET_FIELD(_r, _f) ((DPORT_REG_READ(_r) >> (_f##_S)) & (_f##_V))
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//set field to register, used when _f is not left shifted by _f##_S
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#define DPORT_REG_SET_FIELD(_r, _f, _v) DPORT_REG_WRITE((_r), ((DPORT_REG_READ(_r) & (~((_f##_V) << (_f##_S))))|(((_v) & (_f##_V))<<(_f##_S))))
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//get field value from a variable, used when _f is not left shifted by _f##_S
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#define DPORT_VALUE_GET_FIELD(_r, _f) (((_r) >> (_f##_S)) & (_f))
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//get field value from a variable, used when _f is left shifted by _f##_S
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#define DPORT_VALUE_GET_FIELD2(_r, _f) (((_r) & (_f))>> (_f##_S))
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//set field value to a variable, used when _f is not left shifted by _f##_S
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#define DPORT_VALUE_SET_FIELD(_r, _f, _v) ((_r)=(((_r) & ~((_f) << (_f##_S)))|((_v)<<(_f##_S))))
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//set field value to a variable, used when _f is left shifted by _f##_S
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#define DPORT_VALUE_SET_FIELD2(_r, _f, _v) ((_r)=(((_r) & ~(_f))|((_v)<<(_f##_S))))
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//generate a value from a field value, used when _f is not left shifted by _f##_S
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#define DPORT_FIELD_TO_VALUE(_f, _v) (((_v)&(_f))<<_f##_S)
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//generate a value from a field value, used when _f is left shifted by _f##_S
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#define DPORT_FIELD_TO_VALUE2(_f, _v) (((_v)<<_f##_S) & (_f))
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//Register read macros with an underscore prefix access DPORT memory directly. In IDF apps, use the non-underscore versions to be SMP-safe.
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#define _DPORT_READ_PERI_REG(addr) (*((volatile uint32_t *)(addr)))
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#define _DPORT_WRITE_PERI_REG(addr, val) (*((volatile uint32_t *)(addr))) = (uint32_t)(val)
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#define _DPORT_REG_SET_BIT(_r, _b) _DPORT_REG_WRITE((_r), (_DPORT_REG_READ(_r)|(_b)))
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#define _DPORT_REG_CLR_BIT(_r, _b) _DPORT_REG_WRITE((_r), (_DPORT_REG_READ(_r) & (~(_b))))
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/**
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* @brief Read value from register, SMP-safe version.
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*
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* This method uses the pre-reading of the APB register before reading the register of the DPORT.
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* This implementation is useful for reading DORT registers for single reading without stall other CPU.
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*
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* @param reg Register address
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* @return Value
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*/
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static inline uint32_t IRAM_ATTR DPORT_READ_PERI_REG(uint32_t reg)
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{
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#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
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return _DPORT_REG_READ(reg);
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#else
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return esp_dport_access_reg_read(reg);
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#endif
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}
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//write value to register
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#define DPORT_WRITE_PERI_REG(addr, val) _DPORT_WRITE_PERI_REG((addr), (val))
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//clear bits of register controlled by mask
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#define DPORT_CLEAR_PERI_REG_MASK(reg, mask) DPORT_WRITE_PERI_REG((reg), (DPORT_READ_PERI_REG(reg)&(~(mask))))
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//set bits of register controlled by mask
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#define DPORT_SET_PERI_REG_MASK(reg, mask) DPORT_WRITE_PERI_REG((reg), (DPORT_READ_PERI_REG(reg)|(mask)))
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//get bits of register controlled by mask
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#define DPORT_GET_PERI_REG_MASK(reg, mask) (DPORT_READ_PERI_REG(reg) & (mask))
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//get bits of register controlled by highest bit and lowest bit
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#define DPORT_GET_PERI_REG_BITS(reg, hipos,lowpos) ((DPORT_READ_PERI_REG(reg)>>(lowpos))&((1<<((hipos)-(lowpos)+1))-1))
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//set bits of register controlled by mask and shift
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#define DPORT_SET_PERI_REG_BITS(reg,bit_map,value,shift) DPORT_WRITE_PERI_REG((reg), ((DPORT_READ_PERI_REG(reg)&(~((bit_map)<<(shift))))|(((value) & bit_map)<<(shift))))
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//get field of register
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#define DPORT_GET_PERI_REG_BITS2(reg, mask,shift) ((DPORT_READ_PERI_REG(reg)>>(shift))&(mask))
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//}}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DPORT_ACCESS_H_ */
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