/**
******************************************************************************
* @file stm3210c_eval_ioe.c
* @author MCD Application Team
* @version V4.5.0
* @date 07-March-2011
* @brief This file includes the IO Expander driver for STMPE811 IO Expander
* devices.
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
*
© COPYRIGHT 2011 STMicroelectronics
******************************************************************************
*/
/* File Info : ---------------------------------------------------------------
Note:
-----
- This driver uses the DMA method for sending and receiving data on I2C bus
which allow higher efficiency and reliability of the communication.
SUPPORTED FEATURES:
- IO Read/write : Set/Reset and Read (Polling/Interrupt)
- Joystick: config and Read (Polling/Interrupt)
- Touch Screen Features: Single point mode (Polling/Interrupt)
- TempSensor Feature: accuracy not determined (Polling).
UNSUPPORTED FEATURES:
- Row ADC Feature is not supported (not implemented on STM3210C-EVAL board)
----------------------------------------------------------------------------*/
/* Includes ------------------------------------------------------------------*/
#include "stm3210c_eval_ioe.h"
/** @addtogroup Utilities
* @{
*/
/** @addtogroup STM32_EVAL
* @{
*/
/** @addtogroup STM3210C_EVAL
* @{
*/
/** @defgroup STM3210C_EVAL_IOE
* @brief This file includes the IO Expander driver for STMPE811 IO Expander
* devices.
* @{
*/
/** @defgroup STM3210C_EVAL_IOE_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup STM3210C_EVAL_IOE_Private_Defines
* @{
*/
#define TIMEOUT_MAX 0x1000 /* 0; count--);
if(TS_State.TouchDetected)
{
x = IOE_TS_Read_X();
y = IOE_TS_Read_Y();
xDiff = x > _x? (x - _x): (_x - x);
yDiff = y > _y? (y - _y): (_y - y);
if (xDiff + yDiff > 5)
{
_x = x;
_y = y;
}
}
/* Update the X position */
TS_State.X = _x;
/* Update the Y position */
TS_State.Y = _y;
/* Update the Z Pression index */
TS_State.Z = IOE_TS_Read_Z();
/* Clear the interrupt pending bit and enable the FIFO again */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x01);
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x00);
/* Return pointer to the updated structure */
return &TS_State;
}
/**
* @brief Returns the temperature row value (in 16 bit format).
* @param None
* @retval The temperature row value.
*/
uint32_t IOE_TempSens_GetData(void)
{
static __IO uint32_t tmp = 0;
/* Aquire data enable */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x03);
/* Enable the TEMPSENS module */
tmp = (uint32_t)((I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_DATA) & 0x03) << 8);
tmp |= (uint32_t)I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_DATA + 1);
tmp = (uint32_t)((33 * tmp * 100) / 751);
tmp = (uint32_t)((tmp + 5) / 10);
/* return the temprature row value */
return tmp;
}
/**
* @brief Checks the selected Global interrupt source pending bit
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param Global_IT: the Global interrupt source to be checked, could be:
* @arg Global_IT_GPIO : All IOs interrupt
* @arg Global_IT_ADC : ADC interrupt
* @arg Global_IT_TEMP : Temperature Sensor interrupts
* @arg Global_IT_FE : Touch Screen Controller FIFO Error interrupt
* @arg Global_IT_FF : Touch Screen Controller FIFO Full interrupt
* @arg Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt
* @arg Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt
* @arg Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt
* @retval Status of the checked flag. Could be SET or RESET.
*/
FlagStatus IOE_GetGITStatus(uint8_t DeviceAddr, uint8_t Global_IT)
{
__IO uint8_t tmp = 0;
/* get the Interrupt status */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_STA);
if ((tmp & (uint8_t)Global_IT) != 0)
{
return SET;
}
else
{
return RESET;
}
}
/**
* @brief Clears the selected Global interrupt pending bit(s)
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param Global_IT: the Global interrupt to be cleared, could be any combination
* of the following values:
* @arg Global_IT_GPIO : All IOs interrupt
* @arg Global_IT_ADC : ADC interrupt
* @arg Global_IT_TEMP : Temperature Sensor interrupts
* @arg Global_IT_FE : Touch Screen Controller FIFO Error interrupt
* @arg Global_IT_FF : Touch Screen Controller FIFO Full interrupt
* @arg Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt
* @arg Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt
* @arg Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_ClearGITPending(uint8_t DeviceAddr, uint8_t Global_IT)
{
/* Write 1 to the bits that have to be cleared */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_STA, Global_IT);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Checks the status of the selected IO interrupt pending bit
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_IT: the IO interrupt to be checked could be IO_ITx Where x can be
* from 0 to 7.
* @retval Status of the checked flag. Could be SET or RESET.
*/
FlagStatus IOE_GetIOITStatus(uint8_t DeviceAddr, uint8_t IO_IT)
{
uint8_t tmp = 0;
/* get the Interrupt status */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_STA);
if ((tmp & (uint8_t)IO_IT) != 0)
{
return SET;
}
else
{
return RESET;
}
}
/**
* @brief Clears the selected IO interrupt pending bit(s).
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_IT: the IO interrupt to be checked could be IO_ITx Where x can be
* from 0 to 7.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_ClearIOITPending(uint8_t DeviceAddr, uint8_t IO_IT)
{
/* Write 1 to the bits that have to be cleared */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_STA, IO_IT);
/* Clear the Edge detection pending bit*/
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_ED, IO_IT);
/* Clear the Rising edge pending bit */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_RE, IO_IT);
/* Clear the Falling edge pending bit */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_GPIO_FE, IO_IT);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Checks if the selected device is correctly configured and
* communicates correctly ont the I2C bus.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @retval IOE_OK if IOE is operational. Other value if failure.
*/
uint8_t IOE_IsOperational(uint8_t DeviceAddr)
{
/* Return Error if the ID is not correct */
if( IOE_ReadID(DeviceAddr) != (uint16_t)STMPE811_ID )
{
/* Check if a Timeout occured */
if (IOE_TimeOut == 0)
{
return (IOE_TimeoutUserCallback());
}
else
{
return IOE_FAILURE; /* ID is not Correct */
}
}
else
{
return IOE_OK; /* ID is correct */
}
}
/**
* @brief Resets the IO Expander by Software (SYS_CTRL1, RESET bit).
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_Reset(uint8_t DeviceAddr)
{
/* Power Down the IO_Expander */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL1, 0x02);
/* wait for a delay to insure registers erasing */
_delay_(2);
/* Power On the Codec after the power off => all registers are reinitialized*/
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL1, 0x00);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Reads the selected device's ID.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @retval The Device ID (two bytes).
*/
uint16_t IOE_ReadID(uint8_t DeviceAddr)
{
uint16_t tmp = 0;
/* Read device ID */
tmp = I2C_ReadDeviceRegister(DeviceAddr, 0);
tmp = (uint32_t)(tmp << 8);
tmp |= (uint32_t)I2C_ReadDeviceRegister(DeviceAddr, 1);
/* Return the ID */
return (uint16_t)tmp;
}
/**
* @brief Configures the selcted IO Expander functionalities.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IOE_TEMPSENS_FCT: the functions to be configured. could be any
* combination of the following values:
* @arg IOE_IO_FCT : IO function
* @arg IOE_TS_FCT : Touch Screen function
* @arg IOE_ADC_FCT : ADC function
* @arg IOE_TEMPSENS_FCT : Tempreature Sensor function
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_FnctCmd(uint8_t DeviceAddr, uint8_t Fct, FunctionalState NewState)
{
uint8_t tmp = 0;
/* Get the register value */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL2);
if (NewState != DISABLE)
{
/* Set the Functionalities to be Enabled */
tmp &= ~(uint8_t)Fct;
}
else
{
/* Set the Functionalities to be Disabled */
tmp |= (uint8_t)Fct;
}
/* Set the register value */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_SYS_CTRL2, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Configures the selected pin direction (to be an input or an output)
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_Pin: IO_Pin_x: Where x can be from 0 to 7.
* @param Direction: could be Direction_IN or Direction_OUT.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_IOPinConfig(uint8_t DeviceAddr, uint8_t IO_Pin, uint8_t Direction)
{
uint8_t tmp = 0;
/* Get all the Pins direction */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_DIR);
if (Direction != Direction_IN)
{
tmp |= (uint8_t)IO_Pin;
}
else
{
tmp &= ~(uint8_t)IO_Pin;
}
/* Write the register new value */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_DIR, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Enables or disables the Global interrupt.
* @param DeviceAddr: The address of the IOExpander, could be :I OE_1_ADDR
* or IOE_2_ADDR.
* @param NewState: could be ENABLE or DISABLE.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_GITCmd(uint8_t DeviceAddr, FunctionalState NewState)
{
uint8_t tmp = 0;
/* Read the Interrupt Control register */
I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_CTRL);
if (NewState != DISABLE)
{
/* Set the global interrupts to be Enabled */
tmp |= (uint8_t)IOE_GIT_EN;
}
else
{
/* Set the global interrupts to be Disabled */
tmp &= ~(uint8_t)IOE_GIT_EN;
}
/* Write Back the Interrupt Control register */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_CTRL, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Configures the selected source to generate or not a global interrupt
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param Global_IT: the interrupt source to be configured, could be:
* @arg Global_IT_GPIO : All IOs interrupt
* @arg Global_IT_ADC : ADC interrupt
* @arg Global_IT_TEMP : Temperature Sensor interrupts
* @arg Global_IT_FE : Touch Screen Controller FIFO Error interrupt
* @arg Global_IT_FF : Touch Screen Controller FIFO Full interrupt
* @arg Global_IT_FOV : Touch Screen Controller FIFO Overrun interrupt
* @arg Global_IT_FTH : Touch Screen Controller FIFO Threshold interrupt
* @arg Global_IT_TOUCH : Touch Screen Controller Touch Detected interrupt
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_GITConfig(uint8_t DeviceAddr, uint8_t Global_IT, FunctionalState NewState)
{
uint8_t tmp = 0;
/* Get the current value of the INT_EN register */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_INT_EN);
if (NewState != DISABLE)
{
/* Set the interrupts to be Enabled */
tmp |= (uint8_t)Global_IT;
}
else
{
/* Set the interrupts to be Disabled */
tmp &= ~(uint8_t)Global_IT;
}
/* Set the register */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_INT_EN, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Configures the selected pins to generate an interrupt or not.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_IT: The IO interrupt to be configured. This parameter could be any
* combination of the following values:
* @arg IO_IT_x: where x can be from 0 to 7.
* @param NewState: could be ENABLE or DISABLE.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_IOITConfig(uint8_t DeviceAddr, uint8_t IO_IT, FunctionalState NewState)
{
uint8_t tmp = 0;
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_EN);
if (NewState != DISABLE)
{
/* Set the interrupts to be Enabled */
tmp |= (uint8_t)IO_IT;
}
else
{
/* Set the interrupts to be Disabled */
tmp &= ~(uint8_t)IO_IT;
}
/* Set the register */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_INT_EN, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Configures the touch Screen Controller (Single point detection)
* @param None
* @retval IOE_OK if all initializations are OK. Other value if error.
*/
uint8_t IOE_TS_Config(void)
{
uint8_t tmp = 0;
/* Enable TSC Fct: already done in IOE_Config */
tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_SYS_CTRL2);
tmp &= ~(uint32_t)(IOE_TS_FCT | IOE_ADC_FCT);
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_SYS_CTRL2, tmp);
/* Enable the TSC gloabl interrupts */
tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_INT_EN);
tmp |= (uint32_t)(IOE_GIT_TOUCH | IOE_GIT_FTH | IOE_GIT_FOV);
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_EN, tmp);
/* Select Sample Time, bit number and ADC Reference */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_ADC_CTRL1, 0x49);
/* Wait for ~20 ms */
_delay_(2);
/* Select the ADC clock speed: 3.25 MHz */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_ADC_CTRL2, 0x01);
/* Select TSC pins in non default mode */
tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_AF);
tmp &= ~(uint8_t)TOUCH_IO_ALL;
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_AF, tmp);
/* Select 2 nF filter capacitor */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CFG, 0x9A);
/* Select single point reading */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_TH, 0x01);
/* Write 0x01 to clear the FIFO memory content. */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x01);
/* Write 0x00 to put the FIFO back into operation mode */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_FIFO_STA, 0x00);
/* set the data format for Z value: 7 fractional part and 1 whole part */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_FRACT_XYZ, 0x01);
/* set the driving capability of the device for TSC pins: 50mA */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_I_DRIVE, 0x01);
/* Use no tracking index, touchscreen controller operation mode (XYZ) and
enable the TSC */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CTRL, 0x01);
/* Clear all the status pending bits */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_STA, 0xFF);
/* Initialize the TS structure to their default values */
TS_State.TouchDetected = TS_State.X = TS_State.Y = TS_State.Z = 0;
/* All configuration done */
return IOE_OK;
}
/**
* @brief Configures and enables the Temperature sensor module.
* @param None
* @retval IOE_OK if all initializations are OK. Other value if error.
*/
uint8_t IOE_TempSens_Config(void)
{
__IO uint8_t tmp = 0;
/* Enable Temperature Sensor Fct: already done in IOE_Config */
tmp = I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_SYS_CTRL2);
tmp &= ~(uint32_t)(IOE_TEMPSENS_FCT | IOE_ADC_FCT);
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_SYS_CTRL2, tmp);
/* Enable the TEMPSENS module */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x01);
/* Aquire data enable */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_TEMP_CTRL, 0x3);
/* All configuration done */
return IOE_OK;
}
/**
* @brief Configures the selected pin to be in Alternate function or not
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_Pin: IO_Pin_x, Where x can be from 0 to 7.
* @param NewState: State of the AF for the selected pin, could be
* ENABLE or DISABLE.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_IOAFConfig(uint8_t DeviceAddr, uint8_t IO_Pin, FunctionalState NewState)
{
uint8_t tmp = 0;
/* Get the current state of the GPIO_AF register */
tmp = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_AF);
if (NewState != DISABLE)
{
/* Enable the selected pins alternate function */
tmp |= (uint8_t)IO_Pin;
}
else
{
/* Disable the selected pins alternate function */
tmp &= ~(uint8_t)IO_Pin;
}
/* Write back the new valu in GPIO_AF register */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_AF, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Configures the Edge for which a transition is detectable for the
* the selected pin.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param IO_Pin: IO_Pin_x, Where x can be from 0 to 7.
* @param Edge: The edge which will be detected. This parameter can be one or a
* a combination of follwing values: EDGE_FALLING and EDGE_RISING .
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_IOEdgeConfig(uint8_t DeviceAddr, uint8_t IO_Pin, uint8_t Edge)
{
uint8_t tmp1 = 0, tmp2 = 0;
/* Get the registers values */
tmp1 = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_FE);
tmp2 = I2C_ReadDeviceRegister(DeviceAddr, IOE_REG_GPIO_RE);
/* Disable the Falling Edge */
tmp1 &= ~(uint8_t)IO_Pin;
/* Disable the Falling Edge */
tmp2 &= ~(uint8_t)IO_Pin;
/* Enable the Falling edge if selected */
if (Edge & EDGE_FALLING)
{
tmp1 |= (uint8_t)IO_Pin;
}
/* Enable the Rising edge if selected */
if (Edge & EDGE_RISING)
{
tmp2 |= (uint8_t)IO_Pin;
}
/* Write back the registers values */
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_FE, tmp1);
I2C_WriteDeviceRegister(DeviceAddr, IOE_REG_GPIO_RE, tmp2);
/* if OK return 0 */
return IOE_OK;
}
/**
* @brief Configures the Interrupt line active state and format (level/edge)
* @param Polarity: could be
* @arg Polarity_Low: Interrupt line is active Low/Falling edge
* @arg Polarity_High: Interrupt line is active High/Rising edge
* @param Type: Interrupt line activity type, could be one of the following values
* @arg Type_Level: Interrupt line is active in level model
* @arg Type_Edge: Interrupt line is active in edge model
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_ITOutConfig(uint8_t Polarity, uint8_t Type)
{
uint8_t tmp = 0;
/* Get the register IOE_REG_INT_CTRL value */
tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_INT_CTRL);
/* Mask the polarity and type bits */
tmp &= ~(uint8_t)0x06;
/* Modify the Interrupt Output line configuration */
tmp |= (uint8_t)(Polarity | Type);
/* Set the register */
I2C_WriteDeviceRegister(IOE_1_ADDR, IOE_REG_INT_CTRL, tmp);
/* Get the register IOE_REG_INT_CTRL value */
tmp = I2C_ReadDeviceRegister(IOE_2_ADDR, IOE_REG_INT_CTRL);
/* Mask the polarity and type bits */
tmp &= ~(uint8_t)0x06;
/* Modify the Interrupt Output line configuration */
tmp |= (uint8_t)(Polarity | Type);
/* Set the register */
I2C_WriteDeviceRegister(IOE_2_ADDR, IOE_REG_INT_CTRL, tmp);
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Writes a value in a register of the device through I2C.
* @param DeviceAddr: The address of the IOExpander, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param RegisterAddr: The target register adress
* @param RegisterValue: The target register value to be written
* @retval IOE_OK: if all operations are OK. Other value if error.
*/
uint8_t I2C_WriteDeviceRegister(uint8_t DeviceAddr, uint8_t RegisterAddr, uint8_t RegisterValue)
{
uint32_t read_verif = 0;
uint8_t IOE_BufferTX = 0;
/* Get Value to be written */
IOE_BufferTX = RegisterValue;
/* Configure DMA Peripheral */
IOE_DMA_Config(IOE_DMA_TX, (uint8_t*)(&IOE_BufferTX));
/* Enable the I2C peripheral */
I2C_GenerateSTART(IOE_I2C, ENABLE);
/* Test on SB Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB) == RESET)
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Transmit the slave address and enable writing operation */
I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
/* Test on ADDR Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Transmit the first address for r/w operations */
I2C_SendData(IOE_I2C, RegisterAddr);
/* Test on TXE FLag (data dent) */
IOE_TimeOut = TIMEOUT_MAX;
while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Enable I2C DMA request */
I2C_DMACmd(IOE_I2C,ENABLE);
/* Enable DMA TX Channel */
DMA_Cmd(IOE_DMA_TX_CHANNEL, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_TX_TCFLAG))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Wait until BTF Flag is set before generating STOP */
IOE_TimeOut = 2 * TIMEOUT_MAX;
while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))
{
}
/* Send STOP Condition */
I2C_GenerateSTOP(IOE_I2C, ENABLE);
/* Disable DMA TX Channel */
DMA_Cmd(IOE_DMA_TX_CHANNEL, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA TX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_TX_TCFLAG);
#ifdef VERIFY_WRITTENDATA
/* Verify (if needed) that the loaded data is correct */
/* Read the just written register*/
read_verif = I2C_ReadDeviceRegister(DeviceAddr, RegisterAddr);
/* Load the register and verify its value */
if (read_verif != RegisterValue)
{
/* Control data wrongly tranfered */
read_verif = IOE_FAILURE;
}
else
{
/* Control data correctly transfered */
read_verif = 0;
}
#endif
/* Return the verifying value: 0 (Passed) or 1 (Failed) */
return read_verif;
}
/**
* @brief Reads a register of the device through I2C.
* @param DeviceAddr: The address of the device, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param RegisterAddr: The target register adress (between 00x and 0x24)
* @retval The value of the read register (0xAA if Timout occured)
*/
uint8_t I2C_ReadDeviceRegister(uint8_t DeviceAddr, uint8_t RegisterAddr)
{
uint8_t IOE_BufferRX[2] = {0x00, 0x00};
/* Configure DMA Peripheral */
IOE_DMA_Config(IOE_DMA_RX, (uint8_t*)IOE_BufferRX);
/* Enable DMA NACK automatic generation */
I2C_DMALastTransferCmd(IOE_I2C, ENABLE);
/* Enable the I2C peripheral */
I2C_GenerateSTART(IOE_I2C, ENABLE);
/* Test on SB Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send device address for write */
I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
/* Test on ADDR Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send the device's internal address to write to */
I2C_SendData(IOE_I2C, RegisterAddr);
/* Test on TXE FLag (data dent) */
IOE_TimeOut = TIMEOUT_MAX;
while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send START condition a second time */
I2C_GenerateSTART(IOE_I2C, ENABLE);
/* Test on SB Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send IOExpander address for read */
I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Receiver);
/* Test on ADDR Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Enable I2C DMA request */
I2C_DMACmd(IOE_I2C,ENABLE);
/* Enable DMA RX Channel */
DMA_Cmd(IOE_DMA_RX_CHANNEL, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = 2 * TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_RX_TCFLAG))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send STOP Condition */
I2C_GenerateSTOP(IOE_I2C, ENABLE);
/* Disable DMA RX Channel */
DMA_Cmd(IOE_DMA_RX_CHANNEL, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA RX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_RX_TCFLAG);
/* return a pointer to the IOE_Buffer */
return (uint8_t)IOE_BufferRX[0];
}
/**
* @brief Reads a buffer of 2 bytes from the device registers.
* @param DeviceAddr: The address of the device, could be : IOE_1_ADDR
* or IOE_2_ADDR.
* @param RegisterAddr: The target register adress (between 00x and 0x24)
* @retval A pointer to the buffer containing the two returned bytes (in halfword).
*/
uint16_t I2C_ReadDataBuffer(uint8_t DeviceAddr, uint32_t RegisterAddr)
{
uint8_t tmp= 0;
uint8_t IOE_BufferRX[2] = {0x00, 0x00};
/* Configure DMA Peripheral */
IOE_DMA_Config(IOE_DMA_RX, (uint8_t*)IOE_BufferRX);
/* Enable DMA NACK automatic generation */
I2C_DMALastTransferCmd(IOE_I2C, ENABLE);
/* Enable the I2C peripheral */
I2C_GenerateSTART(IOE_I2C, ENABLE);
/* Test on SB Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send device address for write */
I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Transmitter);
/* Test on ADDR Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send the device's internal address to write to */
I2C_SendData(IOE_I2C, RegisterAddr);
/* Test on TXE FLag (data dent) */
IOE_TimeOut = TIMEOUT_MAX;
while ((!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_TXE)) && (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_BTF)))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send START condition a second time */
I2C_GenerateSTART(IOE_I2C, ENABLE);
/* Test on SB Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_GetFlagStatus(IOE_I2C,I2C_FLAG_SB))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send IOExpander address for read */
I2C_Send7bitAddress(IOE_I2C, DeviceAddr, I2C_Direction_Receiver);
/* Test on ADDR Flag */
IOE_TimeOut = TIMEOUT_MAX;
while (!I2C_CheckEvent(IOE_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Enable I2C DMA request */
I2C_DMACmd(IOE_I2C,ENABLE);
/* Enable DMA RX Channel */
DMA_Cmd(IOE_DMA_RX_CHANNEL, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = 2 * TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_RX_TCFLAG))
{
if (IOE_TimeOut-- == 0) return(IOE_TimeoutUserCallback());
}
/* Send STOP Condition */
I2C_GenerateSTOP(IOE_I2C, ENABLE);
/* Disable DMA RX Channel */
DMA_Cmd(IOE_DMA_RX_CHANNEL, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA RX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_RX_TCFLAG);
/* Reorganize received data */
tmp = IOE_BufferRX[0];
IOE_BufferRX[0] = IOE_BufferRX[1];
IOE_BufferRX[1] = tmp;
/* return a pointer to the IOE_Buffer */
return *(uint16_t *)IOE_BufferRX;
}
/**
* @brief Return Touch Screen X position value
* @param None
* @retval X position.
*/
static uint16_t IOE_TS_Read_X(void)
{
int32_t x, xr;
x = I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_Y);
/* first correction */
xr = (x * 320) >> 12;
/* second correction */
xr = ((xr * 32)/29) - 17;
if(xr <= 0)
xr = 0;
return (uint16_t)(xr);
}
/**
* @brief Return Touch Screen Y position value
* @param None
* @retval Y position.
*/
static uint16_t IOE_TS_Read_Y(void)
{
int32_t y, yr;
y= I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_X);
yr= (y * 240) >> 12;
yr = ((yr * 240) / 217) - 12;
if(yr <= 0)
yr = 0;
return (uint16_t)(yr);
}
/**
* @brief Return Touch Screen Z position value
* @param None
* @retval Z position.
*/
static uint16_t IOE_TS_Read_Z(void)
{
uint32_t z;
z = I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_Z);
if(z <= 0)
z = 0;
return (uint16_t)(z);
}
/**
* @brief Initializes the GPIO pins used by the IO expander.
* @param None
* @retval None
*/
static void IOE_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable IOE_I2C and IOE_I2C_PORT & Alternate Function clocks */
RCC_APB1PeriphClockCmd(IOE_I2C_CLK, ENABLE);
RCC_APB2PeriphClockCmd(IOE_I2C_SCL_GPIO_CLK | IOE_I2C_SDA_GPIO_CLK | IOE_IT_GPIO_CLK
| RCC_APB2Periph_AFIO, ENABLE);
/* Reset IOE_I2C IP */
RCC_APB1PeriphResetCmd(IOE_I2C_CLK, ENABLE);
/* Release reset signal of IOE_I2C IP */
RCC_APB1PeriphResetCmd(IOE_I2C_CLK, DISABLE);
/* IOE_I2C SCL and SDA pins configuration */
GPIO_InitStructure.GPIO_Pin = IOE_I2C_SCL_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(IOE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
/* IOE_I2C SCL and SDA pins configuration */
GPIO_InitStructure.GPIO_Pin = IOE_I2C_SDA_PIN;
GPIO_Init(IOE_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
/* Set EXTI pin as Input PullUp - IO_Expander_INT */
GPIO_InitStructure.GPIO_Pin = IOE_IT_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(IOE_IT_GPIO_PORT, &GPIO_InitStructure);
/* Connect IO Expander IT line to EXTI line */
GPIO_EXTILineConfig(IOE_IT_EXTI_PORT_SOURCE, IOE_IT_EXTI_PIN_SOURCE);
}
/**
* @brief Configure the I2C Peripheral used to communicate with IO_Expanders.
* @param None
* @retval None
*/
static void IOE_I2C_Config(void)
{
I2C_InitTypeDef I2C_InitStructure;
/* IOE_I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = IOE_I2C_SPEED;
I2C_Init(IOE_I2C, &I2C_InitStructure);
}
/**
* @brief Configure the DMA Peripheral used to handle communication via I2C.
* @param None
* @retval None
*/
static void IOE_DMA_Config(IOE_DMADirection_TypeDef Direction, uint8_t* buffer)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(IOE_DMA_CLK, ENABLE);
/* Initialize the DMA_PeripheralBaseAddr member */
DMA_InitStructure.DMA_PeripheralBaseAddr = IOE_I2C_DR;
/* Initialize the DMA_MemoryBaseAddr member */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)buffer;
/* Initialize the DMA_PeripheralInc member */
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
/* Initialize the DMA_MemoryInc member */
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
/* Initialize the DMA_PeripheralDataSize member */
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
/* Initialize the DMA_MemoryDataSize member */
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
/* Initialize the DMA_Mode member */
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
/* Initialize the DMA_Priority member */
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
/* Initialize the DMA_M2M member */
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
/* If using DMA for Reception */
if (Direction == IOE_DMA_RX)
{
/* Initialize the DMA_DIR member */
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
/* Initialize the DMA_BufferSize member */
DMA_InitStructure.DMA_BufferSize = 2;
DMA_DeInit(IOE_DMA_RX_CHANNEL);
DMA_Init(IOE_DMA_RX_CHANNEL, &DMA_InitStructure);
}
/* If using DMA for Transmission */
else if (Direction == IOE_DMA_TX)
{
/* Initialize the DMA_DIR member */
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
/* Initialize the DMA_BufferSize member */
DMA_InitStructure.DMA_BufferSize = 1;
DMA_DeInit(IOE_DMA_TX_CHANNEL);
DMA_Init(IOE_DMA_TX_CHANNEL, &DMA_InitStructure);
}
}
/**
* @brief Configures the IO expander Interrupt line and GPIO in EXTI mode.
* @param None
* @retval None
*/
static void IOE_EXTI_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
/* Enable Button GPIO clock */
RCC_APB2PeriphClockCmd(IOE_IT_GPIO_CLK | RCC_APB2Periph_AFIO, ENABLE);
/* Configure Button pin as input floating */
GPIO_InitStructure.GPIO_Pin = IOE_IT_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(IOE_IT_GPIO_PORT, &GPIO_InitStructure);
/* Connect Button EXTI Line to Button GPIO Pin */
GPIO_EXTILineConfig(IOE_IT_EXTI_PORT_SOURCE, IOE_IT_EXTI_PIN_SOURCE);
/* Configure Button EXTI line */
EXTI_InitStructure.EXTI_Line = IOE_IT_EXTI_LINE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set Button EXTI Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = IOE_IT_EXTI_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
#ifndef USE_Delay
/**
* @brief Inserts a delay time.
* @param nCount: specifies the delay time length.
* @retval None
*/
static void delay(__IO uint32_t nCount)
{
__IO uint32_t index = 0;
for(index = (100000 * nCount); index != 0; index--)
{
}
}
#endif /* USE_Delay*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/