From 1bb7af4d446174b7181c9bb22dbd14c93642ea10 Mon Sep 17 00:00:00 2001 From: Joel Challis Date: Tue, 17 Aug 2021 23:43:09 +0100 Subject: Relocate platform specific drivers (#13894) * Relocate platform specific drivers * Move stm eeprom * Tidy up slightly --- drivers/avr/i2c_master.c | 241 ----------------------------------------------- 1 file changed, 241 deletions(-) delete mode 100644 drivers/avr/i2c_master.c (limited to 'drivers/avr/i2c_master.c') diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c deleted file mode 100644 index 2773e00778..0000000000 --- a/drivers/avr/i2c_master.c +++ /dev/null @@ -1,241 +0,0 @@ -/* Copyright (C) 2019 Elia Ritterbusch - + - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see . - */ -/* Library made by: g4lvanix - * GitHub repository: https://github.com/g4lvanix/I2C-master-lib - */ - -#include -#include - -#include "i2c_master.h" -#include "timer.h" -#include "wait.h" - -#ifndef F_SCL -# define F_SCL 400000UL // SCL frequency -#endif - -#ifndef I2C_START_RETRY_COUNT -# define I2C_START_RETRY_COUNT 20 -#endif // I2C_START_RETRY_COUNT - -#define TWBR_val (((F_CPU / F_SCL) - 16) / 2) - -#define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) - -void i2c_init(void) { - TWSR = 0; /* no prescaler */ - TWBR = (uint8_t)TWBR_val; - -#ifdef __AVR_ATmega32A__ - // set pull-up resistors on I2C bus pins - PORTC |= 0b11; - - // enable TWI (two-wire interface) - TWCR |= (1 << TWEN); - - // enable TWI interrupt and slave address ACK - TWCR |= (1 << TWIE); - TWCR |= (1 << TWEA); -#endif -} - -static i2c_status_t i2c_start_impl(uint8_t address, uint16_t timeout) { - // reset TWI control register - TWCR = 0; - // transmit START condition - TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN); - - uint16_t timeout_timer = timer_read(); - while (!(TWCR & (1 << TWINT))) { - if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { - return I2C_STATUS_TIMEOUT; - } - } - - // check if the start condition was successfully transmitted - if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) { - return I2C_STATUS_ERROR; - } - - // load slave address into data register - TWDR = address; - // start transmission of address - TWCR = (1 << TWINT) | (1 << TWEN); - - timeout_timer = timer_read(); - while (!(TWCR & (1 << TWINT))) { - if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { - return I2C_STATUS_TIMEOUT; - } - } - - // check if the device has acknowledged the READ / WRITE mode - uint8_t twst = TW_STATUS & 0xF8; - if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) { - return I2C_STATUS_ERROR; - } - - return I2C_STATUS_SUCCESS; -} - -i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { - // Retry i2c_start_impl a bunch times in case the remote side has interrupts disabled. - uint16_t timeout_timer = timer_read(); - uint16_t time_slice = MAX(1, (timeout == (I2C_TIMEOUT_INFINITE)) ? 5 : (timeout / (I2C_START_RETRY_COUNT))); // if it's infinite, wait 1ms between attempts, otherwise split up the entire timeout into the number of retries - i2c_status_t status; - do { - status = i2c_start_impl(address, time_slice); - } while ((status < 0) && ((timeout == I2C_TIMEOUT_INFINITE) || (timer_elapsed(timeout_timer) < timeout))); - return status; -} - -i2c_status_t i2c_write(uint8_t data, uint16_t timeout) { - // load data into data register - TWDR = data; - // start transmission of data - TWCR = (1 << TWINT) | (1 << TWEN); - - uint16_t timeout_timer = timer_read(); - while (!(TWCR & (1 << TWINT))) { - if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { - return I2C_STATUS_TIMEOUT; - } - } - - if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) { - return I2C_STATUS_ERROR; - } - - return I2C_STATUS_SUCCESS; -} - -int16_t i2c_read_ack(uint16_t timeout) { - // start TWI module and acknowledge data after reception - TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA); - - uint16_t timeout_timer = timer_read(); - while (!(TWCR & (1 << TWINT))) { - if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { - return I2C_STATUS_TIMEOUT; - } - } - - // return received data from TWDR - return TWDR; -} - -int16_t i2c_read_nack(uint16_t timeout) { - // start receiving without acknowledging reception - TWCR = (1 << TWINT) | (1 << TWEN); - - uint16_t timeout_timer = timer_read(); - while (!(TWCR & (1 << TWINT))) { - if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { - return I2C_STATUS_TIMEOUT; - } - } - - // return received data from TWDR - return TWDR; -} - -i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) { - i2c_status_t status = i2c_start(address | I2C_WRITE, timeout); - - for (uint16_t i = 0; i < length && status >= 0; i++) { - status = i2c_write(data[i], timeout); - } - - i2c_stop(); - - return status; -} - -i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) { - i2c_status_t status = i2c_start(address | I2C_READ, timeout); - - for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) { - status = i2c_read_ack(timeout); - if (status >= 0) { - data[i] = status; - } - } - - if (status >= 0) { - status = i2c_read_nack(timeout); - if (status >= 0) { - data[(length - 1)] = status; - } - } - - i2c_stop(); - - return (status < 0) ? status : I2C_STATUS_SUCCESS; -} - -i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) { - i2c_status_t status = i2c_start(devaddr | 0x00, timeout); - if (status >= 0) { - status = i2c_write(regaddr, timeout); - - for (uint16_t i = 0; i < length && status >= 0; i++) { - status = i2c_write(data[i], timeout); - } - } - - i2c_stop(); - - return status; -} - -i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) { - i2c_status_t status = i2c_start(devaddr, timeout); - if (status < 0) { - goto error; - } - - status = i2c_write(regaddr, timeout); - if (status < 0) { - goto error; - } - - status = i2c_start(devaddr | 0x01, timeout); - - for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) { - status = i2c_read_ack(timeout); - if (status >= 0) { - data[i] = status; - } - } - - if (status >= 0) { - status = i2c_read_nack(timeout); - if (status >= 0) { - data[(length - 1)] = status; - } - } - -error: - i2c_stop(); - - return (status < 0) ? status : I2C_STATUS_SUCCESS; -} - -void i2c_stop(void) { - // transmit STOP condition - TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO); -} -- cgit v1.2.3