📄 bsp.c
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* Return(s) : The 32bit counts of the timer.
*********************************************************************************************************
*/
#if (uC_PROBE_COM_MODULE == DEF_ENABLED) && (OS_PROBE_HOOKS_EN == 1)
CPU_INT32U OSProbe_TmrRd (void)
{
return ((CPU_INT32U)T1TC);
}
#endif
/*
*********************************************************************************************************
*********************************************************************************************************
** uC/OS-II TIMER FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* Tmr_TickInit()
*
* Description : Initialize uC/OS-II's tick source.
*
* Argument(s) : none.
*
* Return(s) : none.
*********************************************************************************************************
*/
void Tmr_TickInit (void)
{
CPU_INT32U pclk_freq;
CPU_INT32U rld_cnts;
/* VIC timer #0 init. */
VICIntSelect &= ~(1 << VIC_TIMER0); /* Configure the timer interrupt as an IRQ source. */
VICVectAddr4 = (CPU_INT32U)Tmr_TickISR_Handler; /* Set the vector address. */
VICVectPriority4 = 15; /* Set the vector priority. */
VICIntEnable = (1 << VIC_TIMER0); /* Enable the timer interrupt source. */
pclk_freq = BSP_CPU_PclkFreq(PCLK_TIMER0); /* Get the peripheral clock frequency. */
rld_cnts = pclk_freq / OS_TICKS_PER_SEC; /* Calculate the nbr of cnts necessary for the OS tick. */
T0TCR = (1 << 1); /* Disable and reset ctr 0 and the prescale ctr 0. */
T0TCR = 0; /* Clear the reset bit. */
T0PC = 0; /* Prescaler is set to no division. */
T0MR0 = rld_cnts;
T0MCR = 3; /* Interrupt on MR0 (reset TC), stop TC. */
T0CCR = 0; /* Capture is disabled. */
T0EMR = 0; /* No external match output. */
T0TCR = 1; /* Enable timer 0. */
}
/*
*********************************************************************************************************
* Tmr_TickISR_Handler()
*
* Description : Handle the timer interrupt that is used to generate TICKs for uC/OS-II.
*
* Argument(s) : none.
*
* Return(s) : none.
*********************************************************************************************************
*/
void Tmr_TickISR_Handler (void)
{
T0IR = 0xFF; /* Clear timer #0 interrupt. */
OSTimeTick(); /* Call uC/OS-II's OSTimeTick(). */
}
/*
*********************************************************************************************************
*********************************************************************************************************
** LOCAL FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* PLL_Init()
*
* Description : Set up and activate the PLL.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (1) The PLL output frequency is calculated by:
*
* Fcco = 2 * Fin * m / n
*
* where
*
* Fin is the PLL input clock (here, the main oscillator)
* M is the PLL clock multiplier. The value (M - 1) is programmed in PLLCFG.
* N is the PLL clock divider. The value (N - 1) is programmed in PLLCFG.
*
* (2) Fcco must be between 250 and 550 MHz. The ARM Core clock must never exceed 72 MHz.
* Set clk_div to divide Fcco accordingly.
*
* (3) When using the USB device, you must choose Fcco as a multiple of 96 MHz, and then
* set clk_div_usb to divide Fcco to exactly 48 MHz.
*
* (4) In this example
*
* Fin = 12MHz,
* M = 12,
* N = 1,
* clk_div = 6, and
* clk_div_usb = 6.
*
* Therefore, Fcco = 2 * Fin * M / N = (2 * 12 * 12 / 1) = 288MHz.
* The processor clock = (Fcco / clk_div) = (288MHz / 6) = 48MHz.
* Finally, the USB clock = (Fcco / clk_div_usb) = (288MHz / 6) = 48MHz.
*
* (5) A PLL errata on early revisions of the part prevent Fcco from being greater than 288MHz.
*
* (6) For later revisions, M = 20, clk_div = 8, and clk_div_usb = 10 will yield 60MHz for
* the processor clock and 48MHz for the USB clock.
*********************************************************************************************************
*/
static void PLL_Init (void)
{
#if CPU_CFG_CRITICAL_METHOD == CPU_CRITICAL_METHOD_STATUS_LOCAL
CPU_SR cpu_sr = 0;
#endif
CPU_INT32U m;
CPU_INT32U n;
CPU_INT32U clk_div;
CPU_INT32U clk_div_usb;
m = 11; /* PLL Multiplier = 20, MSEL bits = 12 - 1 = 11. */
n = 0; /* PLL Divider = 1, NSEL bits = 1 - 1 = 0. */
clk_div = 5; /* Cfg the ARM Core clock div to 6. CCLKSEL = 6 - 1. */
clk_div_usb = 5; /* Cfg the USB clock divider to 6, USBSEL = 6 - 1. */
if ((PLLSTAT & DEF_BIT_25) > 0) { /* If the PLL is already running. */
CPU_CRITICAL_ENTER();
PLLCON &= ~DEF_BIT_01; /* Disconnect the PLL. */
PLLFEED = 0xAA; /* PLL register update sequence, 0xAA, 0x55. */
PLLFEED = 0x55;
CPU_CRITICAL_EXIT();
}
CPU_CRITICAL_ENTER();
PLLCON &= ~DEF_BIT_00; /* Disable the PLL. */
PLLFEED = 0xAA; /* PLL register update sequence, 0xAA, 0x55. */
PLLFEED = 0x55;
CPU_CRITICAL_EXIT();
SCS &= ~DEF_BIT_04; /* OSCRANGE = 0, Main OSC is between 1 and 20 Mhz. */
SCS |= DEF_BIT_05; /* OSCEN = 1, Enable the main oscillator. */
while ((SCS & DEF_BIT_06) == 0) { /* Wait until OSCSTAT is set (Main OSC rdy to be used). */
;
}
CLKSRCSEL = DEF_BIT_00; /* Select main OSC, 12MHz, as the PLL clock source. */
CPU_CRITICAL_ENTER();
PLLCFG = (m << 0) | (n << 16); /* Configure the PLL multiplier and divider. */
PLLFEED = 0xAA; /* PLL register update sequence, 0xAA, 0x55. */
PLLFEED = 0x55;
CPU_CRITICAL_EXIT();
CPU_CRITICAL_ENTER();
PLLCON |= DEF_BIT_00; /* Enable the PLL. */
PLLFEED = 0xAA; /* PLL register update sequence, 0xAA, 0x55. */
PLLFEED = 0x55;
CPU_CRITICAL_EXIT();
CCLKCFG = clk_div; /* Configure the ARM Core Processor clock divider. */
USBCLKCFG = clk_div_usb; /* Configure the USB clock divider. */
while ((PLLSTAT & DEF_BIT_26) == 0) { /* Wait for PLOCK to become set. */
;
}
PCLKSEL0 = 0xAAAAAAAA; /* Set peripheral clocks to be half of main clock. */
PCLKSEL1 = 0x22AAA8AA;
CPU_CRITICAL_ENTER();
PLLCON |= DEF_BIT_01; /* Connect the PLL. The PLL is now the active clk src. */
PLLFEED = 0xAA; /* PLL register update sequence, 0xAA, 0x55. */
PLLFEED = 0x55;
CPU_CRITICAL_EXIT();
while ((PLLSTAT & DEF_BIT_25) == 0) { /* Wait PLLC, the PLL connect status bit to become set. */
;
}
}
/*
*********************************************************************************************************
* MAM_Init()
*
* Description : Initialize the Memory Acceleration Module.
*
* Argument(s) : none.
*
* Return(s) : none.
*********************************************************************************************************
*/
static void MAM_Init (void)
{
CPU_INT32U clk_freq;
clk_freq = BSP_CPU_ClkFreq(); /* Get the current core clock frequency. */
MAMCR = 0; /* Disable MAM functionality. */
if (clk_freq < 20000000) { /* Compare current clock frequency with MAM modes. */
MAMTIM = 1; /* Set MAM fetch cycles to 1 processor clk in duration. */
}
if (clk_freq < 40000000) {
MAMTIM = 2; /* Set MAM fetch cycles to 2 processor clk in duration. */
}
if (clk_freq >= 40000000) {
MAMTIM = 3; /* Set MAM fetch cycles to 3 processor clk in duration. */
}
MAMCR = 1; /* Enable partially-enabled MAM functionality */
}
/*
*********************************************************************************************************
* GPIO_Init()
*
* Description : Initializes the GPIO pins. All the I/O pins are initialized in this function
* so you don't have to look at multiple places for I/O initialization.
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Note(s) : (1) Refer to the LPC2378 User Manual, Chapter 9 for a detailed Pin Assignment
*********************************************************************************************************
*/
static void GPIO_Init (void)
{
CPU_INT32U pinsel;
IO0DIR = 0;
IO1DIR = 0;
FIO0DIR = 0;
FIO1DIR = 0;
FIO2DIR = 0;
FIO3DIR = 0;
FIO4DIR = 0;
FIO0MASK = 0;
FIO1MASK = 0;
FIO2MASK = 0;
FIO3MASK = 0;
FIO4MASK = 0;
PINSEL0 = 0;
PINSEL1 = 0;
PINSEL2 = 0;
PINSEL3 = 0;
PINSEL4 = 0;
PINSEL5 = 0;
PINSEL6 = 0;
PINSEL7 = 0;
PINSEL8 = 0;
PINSEL9 = 0;
PINSEL10 = 0;
/* Configure P0.28 & P0.27 for I2C0. */
pinsel = PINSEL1;
pinsel &= 0xFC3FFFFF;
pinsel |= 0x01400000;
PINSEL1 = pinsel;
/* Configure P2.10 for GPIO. */
pinsel = PINSEL4;
pinsel &= 0xFFCFFFFF;
PINSEL4 = pinsel;
FIO2DIR &= ~DEF_BIT_10;
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