/* * 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 #include "shared-bindings/busio/I2C.h" #include "py/mperrno.h" #include "py/runtime.h" #include "shared-bindings/microcontroller/__init__.h" #include "supervisor/shared/translate.h" #include "common-hal/microcontroller/Pin.h" // Arrays use 0 based numbering: I2C1 is stored at index 0 #define MAX_I2C 4 STATIC bool reserved_i2c[MAX_I2C]; STATIC bool never_reset_i2c[MAX_I2C]; #define ALL_CLOCKS 0xFF STATIC void i2c_clock_enable(uint8_t mask); STATIC void i2c_clock_disable(uint8_t mask); void i2c_reset(void) { uint16_t never_reset_mask = 0x00; for(int i = 0; i < MAX_I2C; i++) { if (!never_reset_i2c[i]) { reserved_i2c[i] = false; } else { never_reset_mask |= 1 << i; } } i2c_clock_disable(ALL_CLOCKS & ~(never_reset_mask)); } 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 = MP_ARRAY_SIZE(mcu_i2c_sda_list); uint8_t scl_len = MP_ARRAY_SIZE(mcu_i2c_scl_list); bool i2c_taken = false; bool search_done = false; for (uint i = 0; i < sda_len; i++) { if (mcu_i2c_sda_list[i].pin == sda) { for (uint j = 0; j < scl_len; j++) { if ((mcu_i2c_scl_list[j].pin == scl) && (mcu_i2c_scl_list[j].periph_index == mcu_i2c_sda_list[i].periph_index)) { // Keep looking if the I2C is taken, could be another SCL that works if (reserved_i2c[mcu_i2c_scl_list[j].periph_index - 1]) { i2c_taken = true; continue; } self->scl = &mcu_i2c_scl_list[j]; self->sda = &mcu_i2c_sda_list[i]; // Multi-level break here, or it'll pick the highest numbered peripheral (inefficient) search_done = true; break; } } if (search_done) { break; } } } // Handle typedef selection, errors if (self->sda != NULL && self->scl != NULL ) { I2Cx = mcu_i2c_banks[self->sda->periph_index - 1]; } else { if (i2c_taken) { mp_raise_ValueError(translate("Hardware busy, try alternative pins")); } else { mp_raise_ValueError(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); // Note: due to I2C soft reboot issue, do not relocate clock init. i2c_clock_enable(1 << (self->sda->periph_index - 1)); reserved_i2c[self->sda->periph_index - 1] = true; // Handle the HAL handle differences #if (CPY_STM32H7 || CPY_STM32F7) self->handle.Init.Timing = 0x40604E73; //Taken from STCube examples #else self->handle.Init.ClockSpeed = 100000; self->handle.Init.DutyCycle = I2C_DUTYCYCLE_2; #endif self->handle.Instance = I2Cx; 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; self->handle.State = HAL_I2C_STATE_RESET; if (HAL_I2C_Init(&(self->handle)) != HAL_OK) { mp_raise_RuntimeError(translate("I2C Init Error")); } claim_pin(sda); claim_pin(scl); } void common_hal_busio_i2c_never_reset(busio_i2c_obj_t *self) { for (size_t i = 0; i < MP_ARRAY_SIZE(mcu_i2c_banks); i++) { if (self->handle.Instance == mcu_i2c_banks[i]) { never_reset_i2c[i] = true; never_reset_pin_number(self->scl->pin->port, self->scl->pin->number); never_reset_pin_number(self->sda->pin->port, self->sda->pin->number); break; } } } bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self) { return self->sda == NULL; } void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self) { if (common_hal_busio_i2c_deinited(self)) { return; } i2c_clock_disable(1 << (self->sda->periph_index - 1)); reserved_i2c[self->sda->periph_index - 1] = false; never_reset_i2c[self->sda->periph_index - 1] = false; reset_pin_number(self->sda->pin->port,self->sda->pin->number); reset_pin_number(self->scl->pin->port,self->scl->pin->number); self->sda = NULL; self->scl = NULL; } 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, 500); 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, 500) == HAL_OK ? 0 : MP_EIO; } STATIC void i2c_clock_enable(uint8_t mask) { // Note: hard reset required due to soft reboot issue. #ifdef I2C1 if (mask & (1 << 0)) { __HAL_RCC_I2C1_CLK_ENABLE(); __HAL_RCC_I2C1_FORCE_RESET(); __HAL_RCC_I2C1_RELEASE_RESET(); } #endif #ifdef I2C2 if (mask & (1 << 1)) { __HAL_RCC_I2C2_CLK_ENABLE(); __HAL_RCC_I2C2_FORCE_RESET(); __HAL_RCC_I2C2_RELEASE_RESET(); } #endif #ifdef I2C3 if (mask & (1 << 2)) { __HAL_RCC_I2C3_CLK_ENABLE(); __HAL_RCC_I2C3_FORCE_RESET(); __HAL_RCC_I2C3_RELEASE_RESET(); } #endif #ifdef I2C4 if (mask & (1 << 3)) { __HAL_RCC_I2C4_CLK_ENABLE(); __HAL_RCC_I2C4_FORCE_RESET(); __HAL_RCC_I2C4_RELEASE_RESET(); } #endif } STATIC void i2c_clock_disable(uint8_t mask) { #ifdef I2C1 if (mask & (1 << 0)) { __HAL_RCC_I2C1_CLK_DISABLE(); } #endif #ifdef I2C2 if (mask & (1 << 1)) { __HAL_RCC_I2C2_CLK_DISABLE(); } #endif #ifdef I2C3 if (mask & (1 << 2)) { __HAL_RCC_I2C3_CLK_DISABLE(); } #endif #ifdef I2C4 if (mask & (1 << 3)) { __HAL_RCC_I2C4_CLK_DISABLE(); } #endif }