255 lines
8.3 KiB
C
255 lines
8.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Scott Shawcroft
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* Copyright (c) 2019 Lucian Copeland for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdbool.h>
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#include "shared-bindings/busio/I2C.h"
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#include "py/mperrno.h"
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#include "py/runtime.h"
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#include "stm32f4xx_hal.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "supervisor/shared/translate.h"
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#include "common-hal/microcontroller/Pin.h"
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STATIC bool reserved_i2c[3];
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STATIC bool never_reset[3];
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void i2c_reset(void) {
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//Note: I2Cs are also forcibly reset in construct, due to silicon error
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#ifdef I2C1
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reserved_i2c[0] = false;
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__HAL_RCC_I2C1_CLK_DISABLE();
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#endif
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#ifdef I2C2
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reserved_i2c[1] = false;
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__HAL_RCC_I2C2_CLK_DISABLE();
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#endif
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#ifdef I2C3
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reserved_i2c[2] = false;
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__HAL_RCC_I2C3_CLK_DISABLE();
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#endif
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}
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void common_hal_busio_i2c_never_reset(busio_i2c_obj_t *self) {
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for (size_t i = 0 ; i < MP_ARRAY_SIZE(mcu_i2c_banks); i++) {
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if (self->handle.Instance == mcu_i2c_banks[i]) {
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never_reset[i] = true;
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never_reset_pin_number(self->scl->pin->port, self->scl->pin->number);
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never_reset_pin_number(self->sda->pin->port, self->scl->pin->number);
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break;
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}
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}
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}
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void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
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const mcu_pin_obj_t* scl, const mcu_pin_obj_t* sda, uint32_t frequency, uint32_t timeout) {
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//match pins to I2C objects
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I2C_TypeDef * I2Cx;
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uint8_t sda_len = sizeof(mcu_i2c_sda_list)/sizeof(*mcu_i2c_sda_list);
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uint8_t scl_len = sizeof(mcu_i2c_scl_list)/sizeof(*mcu_i2c_scl_list);
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bool i2c_taken = false;
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for(uint i=0; i<sda_len;i++) {
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if (mcu_i2c_sda_list[i].pin == sda) {
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for(uint j=0; j<scl_len;j++) {
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if ((mcu_i2c_scl_list[j].pin == scl)
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&& (mcu_i2c_scl_list[j].i2c_index == mcu_i2c_sda_list[i].i2c_index)) {
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//keep looking if the I2C is taken, could be another SCL that works
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if(reserved_i2c[mcu_i2c_scl_list[i].i2c_index-1]) {
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i2c_taken = true;
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continue;
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}
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self->scl = &mcu_i2c_scl_list[j];
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self->sda = &mcu_i2c_sda_list[i];
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break;
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}
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}
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}
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}
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//handle typedef selection, errors
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if(self->sda!=NULL && self->scl!=NULL ) {
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I2Cx = mcu_i2c_banks[self->sda->i2c_index-1];
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} else {
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if (i2c_taken) {
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mp_raise_ValueError(translate("Hardware busy, try alternative pins"));
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} else {
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mp_raise_ValueError(translate("Invalid I2C pin selection"));
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}
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}
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//Start GPIO for each pin
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = pin_mask(sda->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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GPIO_InitStruct.Alternate = self->sda->altfn_index;
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HAL_GPIO_Init(pin_port(sda->port), &GPIO_InitStruct);
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GPIO_InitStruct.Pin = pin_mask(scl->number);
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GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStruct.Pull = GPIO_PULLUP;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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GPIO_InitStruct.Alternate = self->scl->altfn_index;
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HAL_GPIO_Init(pin_port(scl->port), &GPIO_InitStruct);
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//Fix for HAL error caused by soft reboot GPIO init SDA pin voltage drop. See Eratta.
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//Must be in this exact spot or I2C will get stuck in infinite loop.
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//TODO: See git issue #2172
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#ifdef I2C1
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__HAL_RCC_I2C1_FORCE_RESET();
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HAL_Delay(2);
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__HAL_RCC_I2C1_RELEASE_RESET();
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#endif
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#ifdef I2C2
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__HAL_RCC_I2C2_FORCE_RESET();
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HAL_Delay(2);
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__HAL_RCC_I2C2_RELEASE_RESET();
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#endif
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#ifdef I2C3
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__HAL_RCC_I2C3_FORCE_RESET();
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HAL_Delay(2);
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__HAL_RCC_I2C3_RELEASE_RESET();
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#endif
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//Keep separate so above hack can be cleanly replaced
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#ifdef I2C1
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if(I2Cx==I2C1) {
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reserved_i2c[0] = true;
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__HAL_RCC_I2C1_CLK_ENABLE();
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}
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#endif
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#ifdef I2C2
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if(I2Cx==I2C2) {
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reserved_i2c[1] = true;
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__HAL_RCC_I2C2_CLK_ENABLE();
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}
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#endif
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#ifdef I2C3
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if(I2Cx==I2C3) {
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reserved_i2c[2] = true;
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__HAL_RCC_I2C3_CLK_ENABLE();
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}
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#endif
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self->handle.Instance = I2Cx;
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self->handle.Init.ClockSpeed = 100000;
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self->handle.Init.DutyCycle = I2C_DUTYCYCLE_2;
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self->handle.Init.OwnAddress1 = 0;
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self->handle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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self->handle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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self->handle.Init.OwnAddress2 = 0;
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self->handle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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self->handle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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if(HAL_I2C_Init(&(self->handle)) != HAL_OK) {
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mp_raise_RuntimeError(translate("I2C Init Error"));
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}
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claim_pin(sda);
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claim_pin(scl);
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}
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bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) {
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return self->sda->pin == mp_const_none;
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}
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void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) {
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if (common_hal_busio_i2c_deinited(self)) {
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return;
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}
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#ifdef I2C1
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if(self->handle.Instance==I2C1) {
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never_reset[0] = false;
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reserved_i2c[0] = false;
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__HAL_RCC_I2C1_CLK_DISABLE();
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}
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#endif
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#ifdef I2C2
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if(self->handle.Instance==I2C2) {
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never_reset[1] = false;
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reserved_i2c[1] = false;
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__HAL_RCC_I2C2_CLK_DISABLE();
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}
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#endif
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#ifdef I2C3
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if(self->handle.Instance==I2C3) {
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never_reset[2] = false;
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reserved_i2c[2] = false;
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__HAL_RCC_I2C3_CLK_DISABLE();
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}
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#endif
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reset_pin_number(self->sda->pin->port,self->sda->pin->number);
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reset_pin_number(self->scl->pin->port,self->scl->pin->number);
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self->sda = mp_const_none;
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self->scl = mp_const_none;
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}
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bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr) {
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return HAL_I2C_IsDeviceReady(&(self->handle), (uint16_t)(addr<<1),2,2) == HAL_OK;
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}
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bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self) {
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bool grabbed_lock = false;
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//Critical section code that may be required at some point.
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// uint32_t store_primask = __get_PRIMASK();
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// __disable_irq();
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// __DMB();
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if (!self->has_lock) {
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grabbed_lock = true;
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self->has_lock = true;
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}
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// __DMB();
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// __set_PRIMASK(store_primask);
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return grabbed_lock;
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}
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bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self) {
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return self->has_lock;
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}
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void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self) {
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self->has_lock = false;
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}
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uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t addr,
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const uint8_t *data, size_t len, bool transmit_stop_bit) {
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HAL_StatusTypeDef result = HAL_I2C_Master_Transmit(&(self->handle), (uint16_t)(addr<<1), (uint8_t *)data, (uint16_t)len, 500);
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return result == HAL_OK ? 0 : MP_EIO;
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}
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uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t addr,
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uint8_t *data, size_t len) {
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return HAL_I2C_Master_Receive(&(self->handle), (uint16_t)(addr<<1), data, (uint16_t)len, 500) == HAL_OK ? 0 : MP_EIO;
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}
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