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jeremybenn |
/**
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* sci.c controls SCI for GCC/HCS12 version of FreeRTOS Demo
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* Parts taken from the CodeWarrior Demo in order to work similar.
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*
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* Author Jefferson L Smith, Robotronics Inc.
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*/
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#include "sci.h"
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#include <sys/ports.h>
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//static word SerFlag; /* Flags for serial communication */
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/* Bits: 0 - OverRun error */
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/* 1 - Framing error */
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/* 2 - Parity error */
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/* 3 - Char in RX buffer */
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/* 4 - Full TX buffer */
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/* 5 - Running int from TX */
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/* 6 - Full RX buffer */
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/* 7 - Noise error */
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/* 8 - Idle character */
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/* 9 - Break detected */
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/* 10 - Unused */
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static word PrescaleValue;
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//static byte NumMode; /* Number of selected baud mode */
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/**
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* SCI_SetBaudRateMode
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*
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* Changes the speed (baud rate).
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*/
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byte SCI_SetBaudRateMode(byte Mod)
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{
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// wired for 24 MHz bus --jeffs
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static const word SCI_Presc[4] = {39,78,156,313};
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if(Mod >= 4) /* Is mode in baud mode list */
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return ERR_VALUE; /* If no then error */
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//NumMode = Mod; /* New baud mode */
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PrescaleValue = SCI_Presc[Mod]; /* Prescaler in high speed mode */
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/* SCI0CR1: LOOPS=0,SCISWAI=0,RSRC=0,M=0,WAKE=0,ILT=0,PE=0,PT=0 */
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SCICR1 = 0x00; /* Set the SCI configuration */
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/* SCI0SR2: ??=0,??=0,??=0,??=0,??=0,BRK13=0,TXDIR=0,RAF=0 */
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SCISR2 = 0x00; /* Set the Break Character Length and Transmitter pin data direction in Single-wire mode */
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SCISR1; /* Reset interrupt request flags */
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SCIBD = PrescaleValue; /* Set prescaler bits */
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/* SCI0CR2: SCTIE=0,TCIE=0,RIE=1,ILIE=0,TE=1,RE=1,RWU=0,SBK=0 */
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SCICR2 = 0x2c; /* Disable error interrupts */
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return ERR_OK; /* OK */
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}
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#if 0 //(not used)
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/**
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* SCI_Init (bean AsynchroSerial)
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*
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* This enables SCI.
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*/
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void SCI_Init(void)
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{
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PrescaleValue = 39; /* Precaler in high speed mode */
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/* SCI0CR1: LOOPS=0,SCISWAI=0,RSRC=0,M=0,WAKE=0,ILT=0,PE=0,PT=0 */
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SCICR1 = 0x00; /* Set the SCI configuration */
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/* SCI0SR2: ??=0,??=0,??=0,??=0,??=0,BRK13=0,TXDIR=0,RAF=0 */
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SCISR2 = 0x00; /* Set the Break Character Length and Transmitter pin data direction in Single-wire mode */
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SCISR1; /* Reset interrupt request flags */
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SCIBD = PrescaleValue; /* Set prescaler bits */
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/* SCI0CR2: SCTIE=0,TCIE=0,RIE=1,ILIE=0,TE=1,RE=1,RWU=0,SBK=0 */
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SCICR2 = 0x2c; /* Disable error interrupts */
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}
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#endif
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