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/*
* @brief I2C monitor ROM API declarations and functions
*
* @note
* Copyright(C) NXP Semiconductors, 2014
* All rights reserved.
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/
#include <stdint.h>
#include <string.h>
#include "hw_i2cmond.h"
#define DRVVERSION 0x0100
/* Private data structure used for the I2C monitor driver, holds the driver and
peripheral context */
typedef struct {
void *pUserData; /*!< Pointer to user data used by driver instance, use NULL if not used */
LPC_I2C_T *base; /*!< Base address of I2C peripheral to use */
i2cMonCapReadyCB pCapCompCB; /*!< Capture complete callback */
i2cMonSetupDMACB pDmaSetupCB; /*!< DMA setup callback */
ROM_I2CMON_CAP_T *pCap; /*!< Pointer to current capture descriptor */
ErrorCode_t pendingStatus; /*!< Pending monitor transfer status before clocking transfer */
} I2CMON_DATACONTEXT_T;
void i2cmon_transfer_handler(ROM_I2CMON_HANDLE_T pHandle)
;
// **********************************************************
uint32_t i2cmon_get_mem_size(void)
{
return sizeof(I2CMON_DATACONTEXT_T);
}
ROM_I2CMON_HANDLE_T i2cmon_init(void *mem, const ROM_I2CMON_INIT_T *pInit)
{
I2CMON_DATACONTEXT_T *pDrv;
uint32_t reg;
/* Verify alignment is at least 4 bytes */
if (((uint32_t) mem & 0x3) != 0) {
return NULL;
}
pDrv = (I2CMON_DATACONTEXT_T *) mem;
memset(pDrv, 0, sizeof(I2CMON_DATACONTEXT_T));
/* Save base of peripheral and pointer to user data */
pDrv->pUserData = pInit->pUserData;
pDrv->base = (LPC_I2C_T *) pInit->base;
/* Clear pending monitor statuses */
pDrv->base->STAT = (I2C_STAT_MONIDLE | I2C_STAT_MONOV);
while ((pDrv->base->STAT & I2C_STAT_MONRDY) != 0) {
/* Toss input data */
reg = pDrv->base->MONRXDAT;
}
/* Enable I2C monitor interface */
reg = pDrv->base->CFG | I2C_CFG_MONEN;
if (pInit->stretch != 0) {
reg |= I2C_CFG_MONCLKSTR;
}
pDrv->base->CFG = reg;
return pDrv;
}
void i2cmom_register_callback(ROM_I2CMON_HANDLE_T pHandle, uint32_t cbIndex, void *pCB)
{
I2CMON_DATACONTEXT_T *pDrv = (I2CMON_DATACONTEXT_T *) pHandle;
if (cbIndex == ROM_I2CMON_CAPTUREREADY_CB) {
pDrv->pCapCompCB = (i2cMonCapReadyCB) pCB;
}
else if (cbIndex == ROM_I2CMON_DMASETUP_CB) {
pDrv->pDmaSetupCB = (i2cMonSetupDMACB) pCB;
}
}
ErrorCode_t i2cmom_start_log(ROM_I2CMON_HANDLE_T pHandle, ROM_I2CMON_CAP_T *pCap)
{
I2CMON_DATACONTEXT_T *pDrv = (I2CMON_DATACONTEXT_T *) pHandle;
/* I2C master controller should be pending and idle */
if (pCap == NULL) {
return ERR_I2C_PARAM;
}
/* Verify receive buffer alignment */
if ((pCap->startBuff == NULL) || ((((uint32_t) pCap->startBuff) & 0x1) != 0) || (pCap->startBuffSz == 0)) {
pCap->status = ERR_I2C_PARAM;
return ERR_I2C_PARAM;
}
pDrv->pCap = pCap;
pCap->capStartBuffSz = 0;
pDrv->pendingStatus = LPC_OK;
pCap->status = ERR_I2C_BUSY;
if ((pCap->flags & ROM_I2CMON_FLAG_FLUSH) != 0) {
while ((pDrv->base->STAT & I2C_STAT_MONRDY) != 0) {
/* Toss input data */
volatile uint32_t reg = pDrv->base->MONRXDAT;
}
}
/* Clear controller state */
pDrv->base->STAT = (I2C_STAT_MONIDLE | I2C_STAT_MONOV);
if (((pCap->flags & ROM_I2CMON_FLAG_DMARX) != 0) && (pDrv->pDmaSetupCB)) {
pDrv->pDmaSetupCB(pHandle, pCap);
/* Enable supported monitor interrupts */
pDrv->base->INTENSET = (I2C_INTENSET_MONOV | I2C_INTENSET_MONIDLE);
}
else {
pCap->flags &= ~ROM_I2CMON_FLAG_DMARX;
/* Enable supported monitor interrupts */
pDrv->base->INTENSET = (I2C_INTENSET_MONRDY | I2C_INTENSET_MONOV | I2C_INTENSET_MONIDLE);
}
/* Is transfer blocking? */
if ((pCap->flags & ROM_I2CMON_FLAG_BLOCKING) != 0) {
while (pCap->status == ERR_I2C_BUSY) {
i2cmon_transfer_handler(pHandle);
}
}
return pCap->status;
}
// Otime = "optimize for speed of code execution"
// ...add this pragma 1 line above the interrupt service routine function.
void i2cmon_transfer_handler(ROM_I2CMON_HANDLE_T pHandle)
{
I2CMON_DATACONTEXT_T *pDrv = (I2CMON_DATACONTEXT_T *) pHandle;
ROM_I2CMON_CAP_T *pCap = pDrv->pCap;
uint16_t data = 0, *pData;
uint32_t status = pDrv->base->STAT;
if (status & I2C_STAT_MONOV) {
/* Monitor data overflow */
data = pDrv->base->MONRXDAT;
pDrv->pendingStatus = ERR_I2C_BUFFER_OVERFLOW;
/* Clear Status Flags */
pDrv->base->STAT = I2C_STAT_MONOV;
}
else if (status & I2C_STAT_MONRDY) {
/* Monitor ready */
data = pDrv->base->MONRXDAT;
/* Enough room to place this data? */
if (pCap->capStartBuffSz >= pCap->startBuffSz) {
/* Data overflow */
pDrv->pendingStatus = ERR_I2C_BUFFER_OVERFLOW;
}
else {
pData = (uint16_t *) pCap->startBuff;
pData[pCap->capStartBuffSz] = data;
pCap->capStartBuffSz++;
}
}
/* Capture complete? */
if ((status & I2C_INTSTAT_MONIDLE) != 0) {
pDrv->base->INTENCLR = (I2C_INTENCLR_MONRDY | I2C_INTENCLR_MONOV |
I2C_INTENCLR_MONIDLE);
pCap->status = pDrv->pendingStatus;
if (pDrv->pCapCompCB) {
pDrv->pCapCompCB(pHandle, pCap);
}
}
}
uint32_t i2cmon_get_driver_version(void)
{
return DRVVERSION;
}
// *********************************************************
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