rit.c

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#include "rit.h"
#include "power.h"
#include "types.h"
#include <LPC17xx.h>
 
_PRIVATE const u32 rit_clk_mhz = 100;
 
_DECL_EXTERNALLY void allocate_jobs_list(MEM_Allocator *const);
_DECL_EXTERNALLY void free_jobs_list(void);
 
_USED_EXTERNALLY u32 base_ival;
_DECL_EXTERNALLY u32 counter_reset_value;
 
RIT_Error RIT_Init(MEM_Allocator *const alloc, u32 ival_ms, u16 int_priority)
{
    // Powering up the RIT
    POWER_TurnOnPeripheral(POW_PCRIT);
 
    CLR_BITS(LPC_SC->PCLKSEL1, 3, 26); // Clear
    SET_BIT(LPC_SC->PCLKSEL1, 26);     // Set PCLK_RIT to CCLK
    SET_BIT(LPC_SC->PCONP, 16);        // Enable power to RIT
 
    LPC_RIT->RICOMPVAL = (rit_clk_mhz * ival_ms * 1000);
    LPC_RIT->RICTRL = 6; // Clear on match + Timer enable for debug
    LPC_RIT->RICOUNTER = 0;
 
    base_ival = ival_ms;
    counter_reset_value = ival_ms;
 
    allocate_jobs_list(alloc);
 
    // Enabling interrupts coming from RIT
    NVIC_EnableIRQ(RIT_IRQn);
 
    if (!IS_DEF_PRIORITY(int_priority) && IS_BETWEEN_EQ(int_priority, 0, 15))
        return RIT_ERR_INT_PRIO_INVALID;
 
    NVIC_SetPriority(RIT_IRQn, int_priority);
    return RIT_ERR_OK;
}
 
void RIT_Deinit(void)
{
    free_jobs_list();
    NVIC_DisableIRQ(RIT_IRQn);
    POWER_TurnOffPeripheral(POW_PCRIT);
}
 
void RIT_Enable(void)
{
    SET_BIT(LPC_RIT->RICTRL, 3);
}
 
void RIT_Disable(void)
{
    CLR_BIT(LPC_RIT->RICTRL, 3);
}
 
bool RIT_IsEnabled(void)
{
    return LPC_RIT->RICTRL & (1 << 3);
}
 
u32 RIT_GetIntervalMs(void)
{
    return base_ival;
}