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подготовка к альфа-тестированию
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@@ -0,0 +1,384 @@
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#include <stdlib.h>
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#include <inttypes.h>
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#include "Arduino.h"
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#include "twi.h"
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#include "mik32_hal_i2c.h"
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#include "mik32_hal_irq.h"
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#define TIMEOUT_TICKS 1000000
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#define TWI_FREQ_DEF WIRE_FREQ_100K // default is 100 kHz
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static void (*twi_onSlaveTransmit)(void);
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static void (*twi_onSlaveReceive)(uint8_t*, int);
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static uint8_t twi_rxBuffer[TWI_BUFFER_LENGTH];
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static volatile uint8_t twi_rxBufferIndex;
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I2C_HandleTypeDef hi2c;
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static uint32_t CurrentFrequency = TWI_FREQ_DEF;
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static bool twiIsOn = false;
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// ---------------------------------------------------------------- //
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/*
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* Function twi_init
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* Desc readys twi pins and sets twi bitrate
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* Input slaveAddress - address of Arduino if working in slave mode
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* Output none
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*/
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uint8_t twi_init(uint8_t slaveAddress)
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{
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// Common settings
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uint32_t EPICmask;
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#if I2C_NUM == 0
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hi2c.Instance = I2C_0;
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EPICmask = HAL_EPIC_I2C_0_MASK;
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#elif I2C_NUM == 1
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hi2c.Instance = I2C_1;
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EPICmask = HAL_EPIC_I2C_1_MASK;
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#else
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#error "Unsupported I2C_NUM value in pins_arduino.h"
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#endif
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hi2c.Init.DigitalFilter = I2C_DIGITALFILTER_2CLOCKCYCLES;
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hi2c.Init.AnalogFilter = I2C_ANALOGFILTER_DISABLE;
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if (slaveAddress == 0) // if there is no address - master mode
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{
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hi2c.Init.Mode = HAL_I2C_MODE_MASTER;
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hi2c.Init.AutoEnd = I2C_AUTOEND_ENABLE;
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}
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else
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{
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// 7-bit address without any additional bits
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hi2c.Init.Mode = HAL_I2C_MODE_SLAVE;
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hi2c.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; // stretch is used
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hi2c.Init.OwnAddress1 = slaveAddress;
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}
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// set the frequency
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if (hi2c.Init.Mode == HAL_I2C_MODE_MASTER)
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twi_setFrequency(CurrentFrequency, true);
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else
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twi_setFrequency(0, true);
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if (HAL_I2C_Init(&hi2c) != HAL_OK)
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return I2C_ERROR;
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// enable interrupts for slave mode
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if (hi2c.Init.Mode == HAL_I2C_MODE_SLAVE)
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{
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// enable interrupts for addressing, byte reception and transfer completion
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HAL_I2C_InterruptDisable(&hi2c, I2C_INTMASK);
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HAL_I2C_InterruptEnable(&hi2c, I2C_CR1_ADDRIE_M | I2C_CR1_RXIE_M | I2C_CR1_STOPIE_M);
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// enable interrupt from i2c
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HAL_EPIC_MaskLevelSet(EPICmask);
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}
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twiIsOn = true;
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return I2C_OK;
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}
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/*
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* Function twi_deinit
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* Desc disables twi pins
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* Input none
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* Output none
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*/
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void twi_deinit(void)
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{
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uint32_t EPICmask;
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HAL_I2C_Disable(&hi2c);
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// disable clock
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#if I2C_NUM == 0
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hi2c.Instance = I2C_0;
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EPICmask = HAL_EPIC_I2C_0_MASK;
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__HAL_PCC_I2C_0_CLK_DISABLE();
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#elif I2C_NUM == 1
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hi2c.Instance = I2C_1;
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EPICmask = HAL_EPIC_I2C_1_MASK;
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__HAL_PCC_I2C_1_CLK_DISABLE();
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#else
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#error "Unsupported I2C_NUM value in pins_arduino.h"
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#endif
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// for slave mode disable interrupts from i2c
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if (hi2c.Init.Mode == HAL_I2C_MODE_SLAVE)
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HAL_EPIC_MaskLevelClear(EPICmask);
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// reconfigure pins to z state
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GPIO_InitTypeDef GPIO_InitStruct;
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memset(&GPIO_InitStruct, 0, sizeof(GPIO_InitStruct));
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// SDA
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GPIO_InitStruct.Pin = (HAL_PinsTypeDef)digitalPinToBitMask(PIN_WIRE_SDA);
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GPIO_InitStruct.Mode = HAL_GPIO_MODE_GPIO_INPUT;
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GPIO_InitStruct.Pull = HAL_GPIO_PULL_NONE;
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HAL_GPIO_Init(digitalPinToPort(PIN_WIRE_SDA), &GPIO_InitStruct);
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// SCL
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GPIO_InitStruct.Pin = (HAL_PinsTypeDef)digitalPinToBitMask(PIN_WIRE_SCL);
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HAL_GPIO_Init(digitalPinToPort(PIN_WIRE_SCL), &GPIO_InitStruct);
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twiIsOn = false;
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}
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/*
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* Function twi_setClock
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* Desc sets twi bit rate
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* Input Clock Frequency - 100000 / 400000 / 1000000,
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* onInit = true only if function is called from twi_init()
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* Output I2C_OK - frequency changed, I2C_ERROR - frequency didn't change
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*/
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uint8_t twi_setFrequency(uint32_t frequency, bool onInit)
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{
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uint8_t ret = I2C_OK;
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// change the frequency only during or after bus initialization
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if (twiIsOn || onInit)
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{
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// You can change the frequency only when the interface is turned off
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HAL_I2C_Disable(&hi2c);
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if (frequency == WIRE_FREQ_100K) // 100 kHz
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{
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hi2c.Clock.PRESC = 2;
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hi2c.Clock.SCLDEL = 8;
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hi2c.Clock.SDADEL = 2;
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hi2c.Clock.SCLH = 49;
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hi2c.Clock.SCLL = 49;
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CurrentFrequency = WIRE_FREQ_100K;
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}
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else if (frequency == WIRE_FREQ_400K) // 400 kHz
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{
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hi2c.Clock.PRESC = 0;
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hi2c.Clock.SCLDEL = 3;
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hi2c.Clock.SDADEL = 2;
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hi2c.Clock.SCLH = 30;
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hi2c.Clock.SCLL = 30;
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CurrentFrequency = WIRE_FREQ_400K;
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}
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else if (frequency == WIRE_FREQ_1000K)// 1000 kHz
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{
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hi2c.Clock.PRESC = 0;
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hi2c.Clock.SCLDEL = 1;
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hi2c.Clock.SDADEL = 2;
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hi2c.Clock.SCLH = 6;
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hi2c.Clock.SCLL = 6;
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CurrentFrequency = WIRE_FREQ_1000K;
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}
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else if (frequency == 0) // slave mode
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{
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hi2c.Clock.PRESC = 0;
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hi2c.Clock.SCLDEL = 0;
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hi2c.Clock.SDADEL = 2;
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hi2c.Clock.SCLH = 0;
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hi2c.Clock.SCLL = 0;
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}
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else
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// frequency does not change
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ret = I2C_ERROR;
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// write the timings to the register if everything is OK
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if (ret == I2C_OK)
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HAL_I2C_SetClockSpeed(&hi2c);
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//turn the interface back only if initialization has already passed
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if (twiIsOn)
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HAL_I2C_Enable(&hi2c);
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}
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else
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ret = I2C_ERROR;
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return ret;
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}
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/*
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* Function twi_masterReadFrom
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* Desc attempts to become twi bus master and read a
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* series of bytes from a device on the bus
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* Input address: 7bit i2c device address
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* data: pointer to byte array
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* length: number of bytes to read into array
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* sendStop: Boolean indicating whether to send a stop at the end
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* Output number of bytes read
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*/
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uint8_t twi_masterReadFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop)
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{
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uint8_t ret = 0;
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// if there are errors left from previous transactions, you need to restart
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// the interface for correct operation
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if (hi2c.ErrorCode != I2C_ERROR_NONE)
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HAL_I2C_Reset(&hi2c);
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if (sendStop) hi2c.Init.AutoEnd = 1;
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else hi2c.Init.AutoEnd = 0;
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// put the data directly into the external buffer
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if (HAL_I2C_Master_Receive(&hi2c, address, data, length, TIMEOUT_TICKS) == HAL_OK)
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ret = length;
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return ret;
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}
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/*
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* Function twi_masterWriteTo
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* Desc attempts to become twi bus master and write a
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* series of bytes to a device on the bus
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* Input address: 7bit i2c device address
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* data: pointer to byte array
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* length: number of bytes in array
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* sendStop: boolean indicating whether or not to send a stop at the end
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* Output 0 .. success
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* 1 .. length to long for buffer
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* 2 .. address send, NACK received
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* 3 .. data send, NACK received
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* 4 .. other twi error (lost bus arbitration, bus error, ..)
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* 5 .. timeout
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*/
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uint8_t twi_masterWriteTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop)
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{
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uint8_t ret = I2C_OK;
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// if there are errors left from previous transactions, you need to restart
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// the interface for correct operation
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if (hi2c.ErrorCode != I2C_ERROR_NONE)
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HAL_I2C_Reset(&hi2c);
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if (sendStop) hi2c.Init.AutoEnd = 1;
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else hi2c.Init.AutoEnd = 0;
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// take data from an external buffer
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HAL_I2C_Master_Transmit(&hi2c, address, data, length, TIMEOUT_TICKS);
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// parse errors
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// check separately, because in hal libraries not all functions look at this
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if (hi2c.Instance->ISR & I2C_ISR_NACKF_M)
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hi2c.ErrorCode = I2C_ERROR_NACK;
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if (hi2c.ErrorCode == (HAL_I2C_ErrorTypeDef)I2C_ERROR_TIMEOUT) ret = I2C_TIMEOUT; // timeout
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else if (hi2c.ErrorCode == (HAL_I2C_ErrorTypeDef)I2C_ERROR_NACK) ret = I2C_NACK_DATA; // didn't receive ACK
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else if (hi2c.ErrorCode != (HAL_I2C_ErrorTypeDef)I2C_OK) ret = I2C_ERROR; // any other error
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return ret;
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}
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/*
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* Function twi_slaveWrite
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* Desc attempts to become twi bus slave and write a
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* series of bytes to a master after it asks
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* Input txData: pointer to byte array
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* bytesNum: number of bytes in array
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* Output 0 .. success
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* 5 .. timeout
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*/
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i2c_status_e twi_slaveWrite(uint8_t *txData, uint8_t bytesNum)
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{
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if ((hi2c.ErrorCode != I2C_ERROR_NONE))
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HAL_I2C_Reset(&hi2c);
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// отправка данных
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HAL_StatusTypeDef error_code = HAL_OK;
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hi2c.Instance->CR2 &= ~I2C_CR2_RELOAD_M;
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if (!(hi2c.Instance->CR1 & I2C_CR1_NOSTRETCH_M)) // NOSTRETCH = 0
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hi2c.Instance->ISR |= I2C_ISR_TXE_M; // Reset TXDR contents
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hi2c.Instance->TXDR = txData[0]; // The first recording is made in advance
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// Запись байта
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for (uint32_t tx_count = 1; tx_count < bytesNum; tx_count++)
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{
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if ((error_code = HAL_I2C_Slave_WaitTXIS(&hi2c, TIMEOUT_TICKS)) != HAL_OK)
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{
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// неудачная запись
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hi2c.Instance->ISR |= I2C_ISR_TXE_M; // Reset TXDR contents
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hi2c.Instance->ICR |= I2C_ICR_STOPCF_M; // Clear the STOP detection flag on the bus
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HAL_I2C_Reset(&hi2c);
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return I2C_TIMEOUT;
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}
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hi2c.Instance->TXDR = txData[tx_count];
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}
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if ((error_code = HAL_I2C_WaitBusy(&hi2c, TIMEOUT_TICKS)) != HAL_OK)
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{
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// неудачное завершение транзакции
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HAL_I2C_Reset(&hi2c);
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return I2C_TIMEOUT;
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}
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hi2c.Instance->ISR |= I2C_ISR_TXE_M; // Reset TXDR contents
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hi2c.Instance->ICR |= I2C_ICR_STOPCF_M; // Clear the STOP detection flag on the bus
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return I2C_OK;
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}
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/*
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* Function twi_attachSlaveRxEvent
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* Desc sets function called before a slave read operation
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* Input function: callback function to use
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* Output none
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*/
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void twi_attachSlaveRxEvent( void (*function)(uint8_t*, int) )
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{
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twi_onSlaveReceive = function;
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}
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/*
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* Function twi_attachSlaveTxEvent
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* Desc sets function called before a slave write operation
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* Input function: callback function to use
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* Output none
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*/
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void twi_attachSlaveTxEvent( void (*function)(void) )
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{
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twi_onSlaveTransmit = function;
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}
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/*
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* Function twi_interruptHandler
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* Desc handles an interrupts from twi
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* Input none
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* Output none
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*/
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void twi_interruptHandler(void)
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{
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uint32_t int_mask = hi2c.Instance->CR1 & I2C_INTMASK; // interrupts allowed
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uint32_t interrupt_status = hi2c.Instance->ISR; // current flags
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// master calls by address, device in slave mode
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if ((interrupt_status & I2C_ISR_ADDR_M) && (int_mask & I2C_CR1_ADDRIE_M))
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{
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// reset ADDR flag
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hi2c.Instance->ICR |= I2C_ICR_ADDRCF_M;
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// look at the transmission direction and respond to the request
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if (interrupt_status & I2C_ISR_DIR_M) // master reads, slave sends
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// отправляем данные
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twi_onSlaveTransmit();
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else // master writes, slave reads
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{
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twi_rxBufferIndex = 0; // write from the beginning of the buffer
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hi2c.State = HAL_I2C_STATE_BUSY;
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hi2c.Instance->CR2 &= ~I2C_CR2_RELOAD_M;
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// wait for interrupts because of receiving a byte or a stop condition
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}
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}
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// new byte of data received
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if ((interrupt_status & I2C_ISR_RXNE_M) && (int_mask & I2C_CR1_RXIE_M))
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{
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// put new byte into buffer
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twi_rxBuffer[twi_rxBufferIndex++] = (uint8_t)hi2c.Instance->RXDR;
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}
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// master sent a STOP to the bus
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if ((interrupt_status & I2C_ISR_STOPF_M) && (int_mask & I2C_CR1_STOPIE_M))
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{
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hi2c.State = HAL_I2C_STATE_END;
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hi2c.Instance->ISR |= I2C_ISR_TXE_M; // Reset TXDR contents
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hi2c.Instance->ICR |= I2C_ICR_STOPCF_M; // Clear the STOP detection flag on the bus
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// pass the received data to callback function
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twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
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}
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}
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@@ -0,0 +1,41 @@
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#ifndef __TWI_H__
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#define __TWI_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef TWI_BUFFER_LENGTH
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#define TWI_BUFFER_LENGTH 32
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#endif
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// I2C state
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typedef enum
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{
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I2C_OK = 0,
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I2C_DATA_TOO_LONG = 1,
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I2C_NACK_ADDR = 2,
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I2C_NACK_DATA = 3,
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I2C_ERROR = 4,
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I2C_TIMEOUT = 5,
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I2C_BUSY = 6
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} i2c_status_e;
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uint8_t twi_init(uint8_t slaveAddress);
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void twi_deinit(void);
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uint8_t twi_setFrequency(uint32_t frequency, bool onInit);
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uint8_t twi_masterReadFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop);
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uint8_t twi_masterWriteTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop);
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i2c_status_e twi_slaveWrite(uint8_t *txData, uint8_t bytesNum);
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void twi_attachSlaveRxEvent(void (*function)(uint8_t*, int));
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void twi_attachSlaveTxEvent(void (*function)(void));
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void twi_interruptHandler(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __TWI_H__ */
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