Revision 0:e255ce830c49, committed 2010-12-01

Comitter:

hugozijlmans

Date:

Wed Dec 01 21:12:54 2010 +0000

Child:

1:2c52307d223f

Commit message:

Basic Timer0 implementation to update MC_PWM

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 01 21:12:54 2010 +0000
@@ -0,0 +1,220 @@
+#include "LPC17xx.h"
+#include "core_cm3.h"
+#include "cmsis_nvic.h"
+
+// Define the register names that haven't been defined
+#define MCLIM0 LPC_MCPWM->MCPER0
+#define MCLIM1 LPC_MCPWM->MCPER1
+#define MCLIM2 LPC_MCPWM->MCPER2
+#define PCLKSEL0 LPC_SC->PCLKSEL0
+#define PCLKSEL1 LPC_SC->PCLKSEL1
+#define T0MR0 LPC_TIM0->MR0
+#define T0PR LPC_TIM0->PR
+#define T0TCR LPC_TIM0->TCR
+#define T0CTCR LPC_TIM0->CTCR
+#define T0MCR LPC_TIM0->MCR
+#define T0IR LPC_TIM0->IR
+#define FIOSET LPC_GPIO1->FIOSET
+#define FIOCLR LPC_GPIO1->FIOCLR
+#define FIOPIN LPC_GPIO1->FIOPIN
+#define FIODIR LPC_GPIO1->FIODIR
+#define PCONP LPC_SC->PCONP
+#define CLKSRCSEL LPC_SC->CLKSRCSEL
+#define PLL0CFG LPC_SC->PLL0CFG
+#define PLL0CON LPC_SC->PLL0CON
+#define CCLKCFG LPC_SC->CCLKCFG
+#define PLL0FEED LPC_SC->PLL0FEED
+#define PLL0STAT LPC_SC->PLL0STAT
+
+// Other defines
+#define SYSCLK 96000000
+#define EXTCLK 12000000
+#define PLLCLK 288000000
+#define PLLMULT (PLLCLK/2/EXTCLK)-1
+#define TIMER0_FREQ 2
+#define TIMER0_DIV (SYSCLK/4/TIMER0_FREQ)-1
+#define LED_MASK 0x00B40000
+#define LED1 0x00040000
+#define LED2 0x00100000
+#define LED3 0x00200000
+#define LED4 0x00800000
+
+void Sys_init(void);
+void Timer0_interrupt_enable(void);
+void Timer0_interrupt_disable(void);
+void Timer0_IRQHandler(void);
+void Timer0_init(void);
+void PWM_init(void);
+void LED_init(void);
+int  main(void);
+void dispatcher(void);
+
+int Timer0_interrupt_flag=0;
+
+void Sys_init(void) {
+
+    // Set main clk as main oscillator
+    CLKSRCSEL = 1;
+
+    // Disconnect the PLL0
+    PLL0CON &= ~(1<<1); /* Disconnect the main PLL (PLL0) */
+
+    // Feed the PLL
+    PLL0FEED = 0xAA;
+    PLL0FEED = 0x55;
+
+    // Wait for main PLL (PLL0) to disconnect
+    while ((PLL0STAT & (1<<25)) != 0x00);
+
+    // Turn off the main PLL (PLL0)
+    PLL0CON &= ~(1<<0);
+
+    // Feed the PLL
+    PLL0FEED = 0xAA;
+    PLL0FEED = 0x55;
+
+    // Wait for main PLL (PLL0) to shut down
+    while ((PLL0STAT & (1<<24)) != 0x00);
+
+    // Set PLL0 multiplier
+    PLL0CFG = PLLMULT;
+
+    // Feed the PLL
+    PLL0FEED = 0xAA;
+    PLL0FEED = 0x55;
+
+    // Turn on the main PLL (PLL0)
+    PLL0CON |= 1<<0;
+
+    // Feed the PLL
+    PLL0FEED = 0xAA;
+    PLL0FEED = 0x55;
+
+    // Wait for main PLL (PLL0) to come up
+    while ((PLL0STAT & (1<<24)) == 0x00);
+
+    // Set CPU clock divider
+    CCLKCFG = 2;
+
+    // Wait for PLOCK0 to become 1
+    while ((PLL0STAT & (1<<26)) == 0x00);
+
+    // Connect to the main PLL (PLL0)
+    PLL0CON |= 1<<1;
+
+    // Feed the PLL
+    PLL0FEED = 0xAA;
+    PLL0FEED = 0x55;
+
+    // Wait for main PLL (PLL0) to connect
+    while ((PLL0STAT & (1<<25)) == 0x00);
+
+}
+
+void Timer0_interrupt_enable(void) {
+
+    // Enable Timer0 interrupt
+    NVIC_EnableIRQ(TIMER0_IRQn);
+}
+
+void Timer0_interrupt_disable(void) {
+
+    // Disable Timer0 interrupt
+    NVIC_DisableIRQ(TIMER0_IRQn);
+}
+
+void Timer0_IRQHandler(void) {
+
+    // Determine the cause of the interrupt
+    T0IR |= T0IR;
+
+    // Clear the Timer0 interrupt
+    NVIC_ClearPendingIRQ(TIMER0_IRQn);
+
+    //Set Timer0 interrupt flag
+    Timer0_interrupt_flag = 1;
+}
+
+void Timer0_init(void) {
+
+    // Set Timer0 interrupt priority
+    NVIC_SetPriority(TIMER0_IRQn, 10);
+
+    // Power the timer0
+    PCONP |= 1 << 1;
+
+    // Reset counter
+    T0TCR = 2;
+
+    // Timer0 perhiperal clock select (01 = CCLK)
+    //PCLKSEL0 &= ~0xC;
+    //PCLKSEL0 |= 0x4;
+
+    // Timer0 overflow value
+    T0MR0 = TIMER0_DIV;
+
+    // Set the prescale register 0
+    T0PR = 0;
+
+    // Timer0 is incremented when the prescale register =<
+    T0CTCR = 0x0;
+
+    // Set the timer0 reset after reaching T0MR0 and interrupt
+    // T0MCR &= ~0x7;
+    T0MCR = 0x3;
+
+    // Enable the counter
+    T0TCR = 1 << 0;
+
+    // Connect the Timer0 interrupt to the interrupt handler
+    NVIC_SetVector(TIMER0_IRQn, (uint32_t)&Timer0_IRQHandler);
+
+    Timer0_interrupt_enable();
+}
+
+void PWM_init(void) {
+
+    // Make the timer overload at 2000 (96MHz / 2000 = 48kHz)
+    // Set the value to 1999 --> hex 7CF
+    MCLIM0 = 0x000007CF;
+    MCLIM1 = 0x000007CF;
+    MCLIM2 = 0x000007CF;
+
+}
+
+void LED_init(void) {
+
+    // Set output direction for LEDs
+    FIODIR |= LED_MASK;
+
+}
+
+int main(void) {
+
+    LED_init();
+
+    Timer0_init();
+
+    Sys_init();
+
+    //PWM_init();
+
+    dispatcher();
+
+}
+
+void dispatcher(void) {
+
+    while (1) {
+
+        if (Timer0_interrupt_flag == 1) {
+            if ((FIOPIN & LED1)==LED1)
+                FIOCLR |= LED1;
+            else
+                FIOSET |= LED1;
+
+            Timer0_interrupt_flag = 0;
+        }
+    }
+
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Dec 01 21:12:54 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e