/******************************************************************************
* Copyright (c) 2011 Texas Instruments Incorporated - http://www.ti.com
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*****************************************************************************/
#include "platform_internal.h"
#if (PLATFORM_UART_IN)
/******************************************************************************
*
* File Name: evmc66x_uart.c
*
* Description: This file contains APIs for UART.
*
*
******************************************************************************/
/************************
* Include Files
************************/
/******************************************************************************
*
* Function: UartInit
*
* Description: This function initializes the UART.
*
* Parameters: void
*
* Return Value: void
*
******************************************************************************/
void UartInit(void)
{
// Allows access to the divisor latches of the baud generator during a
// read or write operation (DLL and DLH)
CSL_FINS (hUartRegs->LCR, UART_LCR_DLAB, CSL_UART_LCR_DLAB_ENABLE);
// Break condition is disabled.
CSL_FINS (hUartRegs->LCR, UART_LCR_BC, CSL_UART_LCR_BC_DISABLE);
// Stick parity is disabled.
CSL_FINS (hUartRegs->LCR, UART_LCR_SP, CSL_UART_LCR_SP_DISABLE);
// Odd parity is selected
CSL_FINS (hUartRegs->LCR, UART_LCR_EPS, CSL_UART_LCR_EPS_ODD);
// No PARITY bit is transmitted or checked
CSL_FINS (hUartRegs->LCR, UART_LCR_PEN, CSL_UART_LCR_PEN_DISABLE);
// Set the baudrate,for accessing LCR[7] should be enable
hUartRegs->DLL = DLL_VAL;
hUartRegs->DLH = DLM_VAL;
// Allows access to the receiver buffer register (RBR),
// the transmitter holding register (THR), and the
// interrupt enable register (IER) selected.
CSL_FINS (hUartRegs->LCR, UART_LCR_DLAB, CSL_UART_LCR_DLAB_DISABLE);
// Even Parity is selected
CSL_FINS (hUartRegs->LCR, UART_LCR_EPS, CSL_UART_LCR_EPS_EVEN);
// Parity Enable
CSL_FINS (hUartRegs->LCR, UART_LCR_PEN, CSL_UART_LCR_PEN_ENABLE);
// Disable THR, RHR, Receiver line status interrupts
CSL_FINS (hUartRegs->IER, UART_IER_ERBI, CSL_UART_IER_ERBI_DISABLE);
CSL_FINS (hUartRegs->IER, UART_IER_ETBEI, CSL_UART_IER_ETBEI_DISABLE);
CSL_FINS (hUartRegs->IER, UART_IER_ELSI, CSL_UART_IER_ELSI_DISABLE);
CSL_FINS (hUartRegs->IER, UART_IER_EDSSI, CSL_UART_IER_EDSSI_DISABLE);
/* If autoflow control is desired,
* write appropriate values to the modem
* control register (MCR). Note that all UARTs
* do not support autoflow control, see
* the device-specific data manual for supported features.
*
* MCR
* ====================================================
* Bit Field Value Description
* 5 AFE 0 Autoflow control is disabled
* 4 LOOP 0 Loop back mode is disabled.
* 1 RTS 0 RTS control (UARTn_RTS is disabled,
* UARTn_CTS is only enabled.)
* =====================================================
*
*
*/
hUartRegs->MCR = 0;
/* Choose the desired response to
* emulation suspend events by configuring
* the FREE bit and enable the UART by setting
* the UTRST and URRST bits in the power and
* emulation management register (PWREMU_MGMT).
*
*
* PWREMU_MGMT
* =================================================
* Bit Field Value Description
* 14 UTRST 1 Transmitter is enabled
* 13 URRST 1 Receiver is enabled
* 0 FREE 1 Free-running mode is enabled
* ===================================================
*
*/
hUartRegs->PWREMU_MGMT = 0x6001;
/* Cleanup previous data (rx trigger is also set to 0)*/
/* Set FCR = 0x07; */
CSL_FINS (hUartRegs->FCR, UART_FCR_FIFOEN, CSL_UART_FCR_FIFOEN_ENABLE);
CSL_FINS (hUartRegs->FCR, UART_FCR_TXCLR, CSL_UART_FCR_TXCLR_CLR);
CSL_FINS (hUartRegs->FCR, UART_FCR_RXCLR, CSL_UART_FCR_RXCLR_CLR);
CSL_FINS (hUartRegs->FCR, UART_FCR_DMAMODE1, CSL_UART_FCR_DMAMODE1_DISABLE);
CSL_FINS (hUartRegs->FCR, UART_FCR_RXFIFTL, CSL_UART_FCR_RXFIFTL_CHAR1);
return;
}
/******************************************************************************
*
* Function: UartSetBaudRate
*
* Description: This function sets the UART baudrate.
*
* Parameters: UINT16 uiBaudRate - baudrate to set
*
* Return Value: void
*
******************************************************************************/
void UartSetBaudRate(uint16_t uiBaudRate)
{
uint8_t uiDLLVal = 0;
uint8_t uiDLHVal = 0;
hUartRegs->LCR = 0x80;
uiDLLVal = (uint8_t )(0x00FF & uiBaudRate);
uiDLHVal = (uint8_t )(0x00FF & (uiBaudRate >> 8));
// Set the baudrate,for accessing LCR[7] should be enable
hUartRegs->DLL = uiDLLVal;
hUartRegs->DLH = uiDLHVal;
hUartRegs->LCR = 0x03;
}
/******************************************************************************
*
* Function: UartReadBaudRate
*
* Description: This function reads the UART baudrate.
*
* Parameters: UART_device eUartDevice - Uart Device
*
* Return Value: UINT16 - 16 bit Baudrate read from UART
*
******************************************************************************/
uint16_t UartReadBaudRate(void)
{
uint16_t ushBaudrate = 0;
uint16_t ushTemp = 0;
hUartRegs->LCR = 0x80;
// Read the baudrate
ushBaudrate = hUartRegs->DLL;
ushTemp = hUartRegs->DLH;
ushBaudrate = (ushBaudrate & 0xFF) | ((ushTemp & 0xFF) << 8);
hUartRegs->LCR = 0x03;
return ushBaudrate;
}
/******************************************************************************
*
* Function: UartReadData
*
* Description: This function reads a byte of data from I2C UART device
*
* Return Value: uint8_t - 8-bit value read from the RBR register
******************************************************************************/
uint8_t UartReadData(void)
{
uint8_t uRcvChar = 0;
uRcvChar = CSL_FEXT(hUartRegs->RBR, UART_RBR_DATA);
return uRcvChar;
}
/******************************************************************************
*
* Function: UartWriteData
*
* Description: This function writes a byte of data to UART device
*
* Parameters: uint8_t uchAddress - Address of 8-bit register
* uint8_t uchByte - 8-bit data to write to THR
*
* Return Value: none
******************************************************************************/
void UartWriteData(uint8_t uchByte)
{
while (!(CSL_FEXT(hUartRegs->LSR, UART_LSR_THRE))) {
platform_delaycycles(10000);
}
CSL_FINS(hUartRegs->THR, UART_THR_DATA, uchByte);
return;
}
/******************************************************************************
*
* Function: UartIsDataReady
*
* Description: This function gets the status of DR bit
*
* Parameters: none
*
* Return Value: Status of DR bit
*
******************************************************************************/
Bool UartIsDataReady(void)
{
Bool DR_val = FALSE;
if (CSL_UART_LSR_DR_READY == (CSL_FEXT(hUartRegs->LSR, UART_LSR_DR))) {
DR_val = TRUE;
}
return (DR_val);
}
/* Nothing past this point */
#endif
Hello,
I am using C6678 DSP. I want to active UART communication of DSP with external sensor. As some members of TI guided me to study pdk library.
C:\ti\pdk_C6678_1_1_2_6\packages\ti\platform\evmc6678l\platform_lib\src\evmc66x_uart.c
I have included path of this library:
"C:\ti\pdk_C6678_1_1_2_6\packages\ti\platform\evmc6678l\platform_lib\lib\debug\ti.platform.evm6678l.ae66"
Now i need some help about functions in this library.
how can i give values of these two arguments "uint16_t" and "uiBaudRate"? how can i set baud rate?
void UartSetBaudRate(uint16_t uiBaudRate)
{
uint8_t uiDLLVal = 0;
uint8_t uiDLHVal = 0;
hUartRegs->LCR = 0x80;
uiDLLVal = (uint8_t )(0x00FF & uiBaudRate);
uiDLHVal = (uint8_t )(0x00FF & (uiBaudRate >> 8));
// Set the baudrate,for accessing LCR[7] should be enable
hUartRegs->DLL = uiDLLVal;
hUartRegs->DLH = uiDLHVal;
hUartRegs->LCR = 0x03;
}
In the following function, there are two arguments "uint8_t" and "uchByte". How can i find the adress of 8-t register? any document? Is uchByte data, which i'll get from sensor? how can i get adress of THR register?
void UartWriteData(uint8_t uchByte)
{
while (!(CSL_FEXT(hUartRegs->LSR, UART_LSR_THRE))) {
platform_delaycycles(10000);
}
CSL_FINS(hUartRegs->THR, UART_THR_DATA, uchByte);
return;
}
I did not find this information in the document ( KeyStone Architecture Universal Asynchronous Receiver/Transmitter (UART)). Please help me about this in detail. Thanks
