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I2C: Adapted 15xx wrapper to 11u6x. #15

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* Refactured class initialisation.
* Refactured I2C::I2CM_XferBlocking() function.
* (!Chip_I2CM_IsMasterPending(pI2C)) -> (Chip_I2CM_StateChanged(pI2C) == 0)
This commit is contained in:
RedHawk 2023-04-16 16:00:35 +03:00
parent 8977eeb8f6
commit 88d68aac56
2 changed files with 27 additions and 36 deletions
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53
source/shoh/src/peripherals/I2C.cpp
View File

@ -40,19 +40,24 @@
#include "I2C.h"
// Remove this when code will be reworked.
#ifndef I2C_NOT_FIXED
// Remove this when code will be reworked.
I2C::I2C (const I2C_config &cfg) : device (nullptr)
{
// if(cfg.device_number == 0) {
device = LPC_I2C0;
// board init must have been called before the pins can be configured
Chip_IOCON_PinMuxSet (LPC_IOCON, 0, 22, IOCON_DIGMODE_EN | cfg.i2c_mode);
Chip_IOCON_PinMuxSet (LPC_IOCON, 0, 23, IOCON_DIGMODE_EN | cfg.i2c_mode);
Chip_SWM_EnableFixedPin (SWM_FIXED_I2C0_SCL);
Chip_SWM_EnableFixedPin (SWM_FIXED_I2C0_SDA);
this->device = LPC_I2C0;
/*
Pins
The pin requires an external pull-up to provide output functionality.
When power is switched off, this pin is floating and does not disturb the I2C lines.
I2C0_SCL (0, 4). (Available for Fast Mode Plus)
I2C1_SCL (0, 7), (1, 11), (1, 30). (Not open-drain)
I2C0_SDA (0, 5). (Available for Fast Mode Plus)
I2C1_SDA (1, 3), (1, 14), (1, 24). (Not open-drain)
*/
Chip_SYSCTL_PeriphReset(RESET_I2C0);
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 4, IOCON_DIGMODE_EN | cfg.i2c_mode);
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 5, IOCON_DIGMODE_EN | cfg.i2c_mode);
//}
// else {
// currently we support only I2C number 0
@ -62,23 +67,21 @@ I2C::I2C (const I2C_config &cfg) : device (nullptr)
{
/* Enable I2C clock and reset I2C peripheral - the boot ROM does not
do this */
Chip_I2C_Init (LPC_I2C0);
Chip_I2CM_Init(this->device);
/* Setup clock rate for I2C */
Chip_I2C_SetClockDiv (LPC_I2C0, cfg.clock_divider);
//No clock divider requiered?
/* Setup I2CM transfer rate */
Chip_I2CM_SetBusSpeed (LPC_I2C0, cfg.speed);
//Bus speed (Determines required amount of clockcyckles for LOW and HIGH signals itself)
Chip_I2CM_SetBusSpeed(this->device, cfg.speed);
/* Enable Master Mode */
Chip_I2CM_Enable (LPC_I2C0);
//Enabled by Chip_I2CM_SendStart()
}
}
I2C::~I2C ()
{
// TODO Auto-generated destructor stub
}
I2C::~I2C () {}
bool
I2C::write (uint8_t devAddr, uint8_t *txBuffPtr, uint16_t txSize)
@ -99,8 +102,7 @@ I2C::transaction (uint8_t devAddr, uint8_t *txBuffPtr, uint16_t txSize,
I2CM_XFER_T i2cmXferRec;
// make sure that master is idle
while (!Chip_I2CM_IsMasterPending (LPC_I2C0))
;
while (Chip_I2CM_StateChanged(this->device) == 0);
/* Setup I2C transfer record */
i2cmXferRec.slaveAddr = devAddr;
@ -110,7 +112,7 @@ I2C::transaction (uint8_t devAddr, uint8_t *txBuffPtr, uint16_t txSize,
i2cmXferRec.txBuff = txBuffPtr;
i2cmXferRec.rxBuff = rxBuffPtr;
I2CM_XferBlocking (LPC_I2C0, &i2cmXferRec);
I2CM_XferBlocking (this->device, &i2cmXferRec);
// Chip_I2CM_XferBlocking returns before stop condition is fully completed
// therefore we need to wait for master to be idle when doing back-to-back
// transactions (see beginning of the function)
@ -140,7 +142,8 @@ I2C::I2CM_XferBlocking (LPC_I2C_T *pI2C, I2CM_XFER_T *xfer)
/* set the transfer status as busy */
xfer->status = I2CM_STATUS_BUSY;
/* Clear controller state. */
Chip_I2CM_ClearStatus (pI2C, I2C_STAT_MSTRARBLOSS | I2C_STAT_MSTSTSTPERR);
Chip_I2CM_ResetControl(pI2C);
/* Write Address and RW bit to data register */
// Chip_I2CM_WriteByte(pI2C, (xfer->slaveAddr << 1) | (xfer->txSz == 0)); //
// original NXP version
@ -154,7 +157,7 @@ I2C::I2CM_XferBlocking (LPC_I2C_T *pI2C, I2CM_XFER_T *xfer)
while (ret == 0)
{
/* wait for status change interrupt */
while (!Chip_I2CM_IsMasterPending (pI2C))
while (Chip_I2CM_StateChanged(pI2C) == 0)
{
}
/* call state change handler */
@ -162,7 +165,3 @@ I2C::I2CM_XferBlocking (LPC_I2C_T *pI2C, I2CM_XFER_T *xfer)
}
return ret;
}
// Remove this when code will be reworked.
#endif /* I2C_NOT_FIXED */
// Remove this when code will be reworked.

10
source/shoh/src/peripherals/I2C.h
View File

@ -8,12 +8,8 @@
#ifndef I2C_H_
#define I2C_H_
// Remove this when code will be reworked.
#define I2C_NOT_FIXED
#ifndef I2C_NOT_FIXED
// Remove this when code will be reworked.
#include "chip.h"
#include "board.h"
struct I2C_config {
unsigned int device_number;
@ -35,8 +31,4 @@ private:
static uint32_t I2CM_XferBlocking(LPC_I2C_T *pI2C, I2CM_XFER_T *xfer);
};
// Remove this when code will be reworked.
#endif /* I2C_NOT_FIXED */
// Remove this when code will be reworked.
#endif /* I2C_H_ */