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STMPE811QTR.c
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/**
******************************************************************************
* <h2><center>© COPYRIGHT 2012 Embest Tech. Co., Ltd.</center></h2>
* @file STMPE811QTR.c
* @author CMP Team
* @version V1.0.0
* @date 28-December-2012
* @brief LCD touch screen controler driver
******************************************************************************
* @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, Embest 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.
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "STMPE811QTR.h"
/** @defgroup STM32F4xx_StdPeriph_Examples
* @{
*/
#define TIMEOUT_MAX 0x3000 /*<! The value of the maximal timeout for I2C waiting loops */
/**
* @}
*/
/** @defgroup STM32F4_DISCOVERY_IOE_Private_Variables
* @{
*/
TS_STATE TS_State; /*<! The global structure holding the TS state */
uint32_t IOE_TimeOut = TIMEOUT_MAX; /*<! Value of Timeout when I2C communication fails */
/**
* @}
*/
/** @defgroup STM32F4_DISCOVERY_IOE_Private_FunctionPrototypes
* @{
*/
static uint16_t IOE_TS_Read_Z(void);
static void IOE_GPIO_Config(void);
static void IOE_I2C_Config(void);
static void IOE_DMA_Config(IOE_DMADirection_TypeDef Direction, uint8_t* buffer);
static void IOE_EXTI_Config(void);
#ifndef USE_Delay
static void delay(__IO uint32_t nCount);
#endif /* USE_Delay*/
/**
* @}
*/
/** @defgroup STM32F4_DISCOVERY_IOE_Private_Functions
* @{
*/
/**
* @brief Initializes and Configures the two IO_Expanders Functionalities
* (IOs, Touch Screen ..) and configures all STM32F4_DISCOVERY necessary
* hardware (GPIOs, APB clocks ..).
* @param None
* @retval IOE_OK if all initializations done correctly. Other value if error.
*/
uint8_t IOE_Config(void)
{
/* Configure the needed pins */
IOE_GPIO_Config();
IOE_I2C_Config();
/* Read IO Expander 1 ID */
if (IOE_IsOperational(IOE_1_ADDR)) {
return IOE1_NOT_OPERATIONAL;
}
/* Generate IOExpander Software reset */
IOE_Reset(IOE_1_ADDR);
/* ---------------------- IO Expander 1 configuration --------------------- */
/* Enable the GPIO, Touch Screen and ADC functionalities */
IOE_FnctCmd(IOE_1_ADDR, IOE_IO_FCT | IOE_TS_FCT | IOE_ADC_FCT, ENABLE);
/* Touch Screen controller configuration */
IOE_TS_Config();
/* Configuration is OK */
return IOE_OK;
}
/**
* @brief Configures The selected interrupts on the IO Expanders.
* @param IOE_ITSRC_Source: the source of the interrupts. Could be one or a
* combination of the following parameters:
* @arg IOE_ITSRC_JOYSTICK: Joystick IO intputs.
* @arg IOE_ITSRC_TSC: Touch Screen interrupts.
* @arg IOE_ITSRC_INMEMS: MEMS interrupt lines.
* @retval IOE_OK: if all initializations are OK. Other value if error.
*/
uint8_t IOE_ITConfig(uint32_t IOE_ITSRC_Source)
{
/* Configure the Interrupt output pin to generate low level (INT_CTRL) */
IOE_ITOutConfig(Polarity_High, Type_Level);
/* Manage the Touch Screen Interrupts */
if (IOE_ITSRC_Source & IOE_ITSRC_TSC) {
/* Enable the Global interrupt */
IOE_GITCmd(IOE_1_ADDR, ENABLE);
/* Enable the Global GPIO Interrupt */
IOE_GITConfig(IOE_1_ADDR, (uint8_t)(IOE_GIT_TOUCH | IOE_GIT_FTH), ENABLE);
/* Read the GPIO_IT_STA to clear all pending bits if any */
I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_GPIO_INT_STA);
}
/* Configure the Interrupt line as EXTI source */
IOE_EXTI_Config();
/* If all OK return IOE_OK */
return IOE_OK;
}
/**
* @brief Returns Status and positions of the Touch screen.
* @param None
* @retval Pointer to TS_STATE structure holding Touch Screen information.
*/
TS_STATE* IOE_TS_GetState(void)
{
uint16_t xDiff, yDiff , x , y;
static uint16_t _x = 0, _y = 0;
/* Check if the Touch detect event happened */
TS_State.TouchDetected = (I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_TSC_CTRL) & 0x80);
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 position 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 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 Checks if the selected device is correctly configured and
* communicates correctly on 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 occurred */
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 selected 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 : Temperature 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 global interrupts */
tmp = I2C_ReadDeviceRegister(IOE_1_ADDR, IOE_REG_INT_EN);
tmp |= (uint32_t)(IOE_GIT_TOUCH | IOE_GIT_FTH );
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 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 value 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 following 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);
/* 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 address
* @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)
{
uint8_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_STREAM, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_TX_STREAM,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_STREAM, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA TX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_TX_STREAM,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 transfered */
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 address (between 00x and 0x24)
* @retval The value of the read register (0xAA if Timeout occurred)
*/
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_STREAM, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = 2 * TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_RX_STREAM,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_STREAM, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA RX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_RX_STREAM,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 address (between 00x and 0x24)
* @retval A pointer to the buffer containing the two returned bytes (in halfword).
*/
uint16_t I2C_ReadDataBuffer(uint8_t DeviceAddr, uint8_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_STREAM, ENABLE);
/* Wait until DMA Transfer Complete */
IOE_TimeOut = 2 * TIMEOUT_MAX;
while (!DMA_GetFlagStatus(IOE_DMA_RX_STREAM, 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_STREAM, DISABLE);
/* Disable I2C DMA request */
I2C_DMACmd(IOE_I2C,DISABLE);
/* Clear DMA RX Transfer Complete Flag */
DMA_ClearFlag(IOE_DMA_RX_STREAM,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 (*(__IO uint16_t *) IOE_BufferRX);
}
/**
* @brief Return Touch Screen X position value
* @param None
* @retval X position.
*/
uint16_t IOE_TS_Read_X(void)
{
#if 0
int32_t x, xr;
x = I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_X);
/* first correction */
xr = (x * 320) >> 12;
/* second correction */
xr = ((xr * 32)/29) - 17;
if (xr <= 0) {
xr = 0;
}
return (uint16_t)(xr);
#else
int32_t icount, sum = 0;
for (icount = 0; icount < 16; icount++) {
sum += I2C_ReadDataBuffer(IOE_1_ADDR, IOE_REG_TSC_DATA_X);
}
sum >>= 4;
if (sum <= 0) {
sum = 0;
}
return (uint16_t)(sum);
#endif
}