?? bsp.c
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/*
*********************************************************************************************************
* Wytec Dragon12 Board Support Package
*
* Freescale MC9S12DP256
*
* File : bsp.c
* By : Eric Shufro
*
* Description: Provides low level hardware functions for use with portable application code
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDES
*********************************************************************************************************
*/
#include <includes.h>
/*
*********************************************************************************************************
* REGISTERS
*
* Registers that are not included in the processor header file may be defind here
*********************************************************************************************************
*/
#ifndef BDMSTS
#define BDMSTS (*((INT8U *)0xFF01)) /* Cast a pointer to the BDM Status register */
#define BDMSTS_CLKSW_MASK (4) /* Bit mask for the CLKSW bit in the BDMSTS register */
#endif
/*
*********************************************************************************************************
* CHARACTER LCD CONSTANT DATA
*
* Notes : 1) RW is permanently pulled LOW in hardware. Under normal circumstances,
* it too should be declared below and referenced in the LCD Write functions
* below.
*********************************************************************************************************
*/
#define LCD_LOWEST_DATA_BIT (INT8U)(2) /* Bit two is the lowest order data bit */
#define LCD_BIT_RS (INT8U)(1 << 0) /* LCD Screen bit RS maps to PORTK, bit 0 */
#define LCD_BIT_E (INT8U)(1 << 1) /* LCD Screen bit EN maps to PORTK, bit 1 */
#define LCD_BIT_DATA0 (INT8U)(1 << 2) /* LCD Screen bit D4 maps to PORTK, bit 2 */
#define LCD_BIT_DATA1 (INT8U)(1 << 3) /* LCD Screen bit D5 maps to PORTK, bit 3 */
#define LCD_BIT_DATA2 (INT8U)(1 << 4) /* LCD Screen bit D6 maps to PORTK, bit 4 */
#define LCD_BIT_DATA3 (INT8U)(1 << 5) /* LCD Screen bit D7 maps to PORTK, bit 5 */
/*
*********************************************************************************************************
* GLOBALS
*********************************************************************************************************
*/
static INT16U OSTickCnts; /* Holds the number of timer increments for the OS Ticker */
/*
*********************************************************************************************************
* PROTOTYPES
*********************************************************************************************************
*/
static void PLL_Init(void); /* Initialize the CPU's PLL */
static void OSTickISR_Init(void); /* Initialize the OS Ticker */
static void LED_Init(void); /* Initialize the LED hardware */
static void Sw_Init(void); /* Initialize Switch hardware */
static void BSP_SetECT_Prescaler(INT8U prescaler); /* Initialize the ECT Prescaler */
/*
*********************************************************************************************************
* BSP_Init()
*
* Description: Initialize BSP, called from app.c instead of calling all of the internal bsp init functions
* seperately, they are grouped together here.
*********************************************************************************************************
*/
void BSP_Init (void)
{
#if PLL_EN > 0
PLL_Init(); /* Initialize the PLL. This must come before CalcPrescaler */
BSP_SetECT_Prescaler(4); /* When using the PLL, an ECT prescaler > 4 MUST be set in */
#endif /* order to prevent OSTickCnts overflow during Tick Init */
OSTickISR_Init();
LED_Init();
}
/*
*********************************************************************************************************
* PLL_Init()
*
* Notes: Will HANG the application if PLL fails to initialize!
*********************************************************************************************************
*/
static void PLL_Init (void)
{
BDMSTS |= BDMSTS_CLKSW_MASK; /* Avoid MC9S12DP256B BDM Looses Sync errata when PLL on */
/* This errata can be avoided by not using a const clk src */
CLKSEL = 0x00; /* Meaning for CLKSEL:
Bit 7: PLLSEL = 0 Use OSCCLK until ready to switch to PLLCLK
Bit 6: PSTP = 0 Do not need to go to Pseudo-Stop Mode
Bit 5: SYSWAI = 0 In wait mode system clocks stop.
Bit 4: ROAWAI = 0 Do not reduce oscillator amplitude in wait mode.
Bit 3: PLLWAI = 0 Do not turn off PLL in wait mode
Bit 2: CWAI = 0 Do not stop the core during wait mode
Bit 1: RTIWAI = 0 Do not stop the RTI in wait mode
Bit 0: COPWAI = 0 Do not stop the COP in wait mode
*/
SYNR = PLL_CLK_MUL; /* Set the desired clock multiplier */
REFDV = PLL_CLK_DIV; /* Set the desired clock divider */
PLLCTL = 0xC0; /* Meaning for PLLCTL:
Bit 7: CME = 1; Clock monitor enable
Bit 6: PLLON = 1; PLL On bit
Bit 5: AUTO = 0; No automatic control of bandwidth, manual through ACQ
Bit 4: ACQ = 1; 1 for high bandwidth filter (acquisition); 0 for low (tracking)
Bit 3: (Not Used by MC9S12C32)
Bit 2: PRE = 0; RTI stops during Pseudo Stop Mode
Bit 1: PCE = 0; COP diabled during Pseudo STOP mode
Bit 0: SCME = 1; Crystal Clock Failure -> Use Self Clock mode.
*/
while((CRGFLG & 0x08) == 0) { /* Wait for PLLCLK to stabilize. */
; /* If the PLL never stabilizes, this will hang forever */
}
CLKSEL_PLLSEL = 1; /* Switch to PLL clock */
}
/*
*********************************************************************************************************
* BSP_CPU_ClkFreq()
*
* Description : Returns the CPU operating frequency. (This is NOT the CPU BUS frequency)
* However, the bus frequency is (clk_frq / 2)
*********************************************************************************************************
*/
INT32U BSP_CPU_ClkFreq (void)
{
INT32U clk_frq;
if ((CLKSEL & CLKSEL_PLLSEL_MASK) == CLKSEL_PLLSEL_MASK) {
clk_frq = ((OSCFREQ * 2) * (PLL_CLK_MUL + 1) / (PLL_CLK_DIV + 1));
} else {
clk_frq = (OSCFREQ);
}
return clk_frq;
}
/*
*********************************************************************************************************
* LED Init (Modify to init appropriate LED Port)
*
* Description : Initialize the data direction registers for any ports that have LEDs attached.
*********************************************************************************************************
*/
void LED_Init (void)
{
DDRB |= 0xFF; /* Set the LED pins to output mode */
DDRJ |= (1 << 1); /* PTJ Pin1 Controls the LED selection, set for output */
PTJ &= ~(1 << 1); /* Clear PTJ Pin1 to enable the onboard LED's */
}
/*
*********************************************************************************************************
* LED Toggle (Using PORTB)
*
* Description : Toggle an LED Pin
*********************************************************************************************************
*/
void LED_Toggle (INT8U led)
{
if (led <= 7) {
DDRJ |= (1 << 1); /* PTJ Pin1 Controls the LED selection, set for output */
PTJ &= ~(1 << 1); /* Clear PTJ Pin1 to enable the onboard LED's */
PORTB ^= (1 << led);
}
}
/*
*********************************************************************************************************
* LED Off (Using PORTB)
*
* Description : Turn off an LED
*********************************************************************************************************
*/
void LED_Off (INT8U led)
{
if (led <= 7) {
DDRJ |= (1 << 1); /* PTJ Pin1 Controls the LED selection, set for output */
PTJ &= ~(1 << 1); /* Clear PTJ Pin1 to enable the onboard LED's */
PORTB &= ~(1 << led);
}
}
/*
*********************************************************************************************************
* LED On (Using PORTB)
*
* Description : Turn On an LED
*********************************************************************************************************
*/
void LED_On (INT8U led)
{
if (led <= 7) {
DDRJ |= (1 << 1); /* PTJ Pin1 Controls the LED selection, set for output */
PTJ &= ~(1 << 1); /* Clear PTJ Pin1 to enable the onboard LED's */
PORTB |= (1 << led);
}
}
/*
*********************************************************************************************************
* BSP OS TIME DELAY (Milliseconds)
*
* Description : This function provides uC/OS-II Time Delays (0-255 ms) to portable application code
*********************************************************************************************************
*/
void BSP_DlyMS (INT8U ms)
{
OSTimeDlyHMSM (0, 0, 0, ms);
}
/*
*********************************************************************************************************
* uC/OS-II TICK ISR INITIALIZATION
*
* Description : This function is used to initialize one of the eight output compares to generate an
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