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