184 lines
5.0 KiB
C
184 lines
5.0 KiB
C
/* big fat FIXME: this should use a consistent structure, and reference
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* functionality from libopencm3 instead of copypasting.
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*
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* particularly unimplemented features are FIXME'd extra
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* */
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/* the original core_cm3.h is nonfree by arm; this provides libopencm3 variant
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* of the symbols efm32lib needs of CMSIS. */
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#ifndef OPENCMSIS_CORECM3_H
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#define OPENCMSIS_CORECM3_H
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#include <libopencm3/cm3/common.h>
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#include <libopencm3/cm3/cortex.h>
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#include <libopencm3/cm3/memorymap.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/scb.h>
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/* needed by system_efm32.h:196, guessing */
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#define __INLINE inline
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/* new since emlib 3.0 */
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#define __STATIC_INLINE static inline
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/* needed around efm32tg840f32.h:229. comparing the efm32lib definitions to the
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* libopencm3 ones, "volatile" is all that's missing. */
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#define __IO volatile
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#define __O volatile
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#define __I volatile
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/* -> style access for what is defined in libopencm3/stm32/f1/scb.h /
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* cm3/memorymap.h, as it's needed by efm32lib/inc/efm32_emu.h */
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/* from cm3/scb.h */
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#define SCB_SCR_SLEEPDEEP_Msk SCB_SCR_SLEEPDEEP
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/* structure as in, for example,
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* DeviceSupport/EnergyMicro/EFM32/efm32tg840f32.h, data from
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* libopencm3/cm3/scb.h. FIXME incomplete. */
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typedef struct {
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__IO uint32_t CPUID;
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__IO uint32_t ICSR;
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__IO uint32_t VTOR;
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__IO uint32_t AIRCR;
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__IO uint32_t SCR;
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__IO uint32_t CCR;
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__IO uint8_t SHPR[12]; /* FIXME: how is this properly indexed? */
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__IO uint32_t SHCSR;
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} SCB_TypeDef;
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#define SCB ((SCB_TypeDef *) SCB_BASE)
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/* needed by efm32_emu.h, guessing and taking the implementation used in
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* lightswitch-interrupt.c */
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#define __WFI() __asm__("wfi")
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/* needed by efm32_cmu.h, probably it's just what gcc provides anyway */
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#define __CLZ(div) __builtin_clz(div)
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/* needed by efm32_aes.c. __builtin_bswap32 does the same thing as the rev
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* instruction according to https://bugzilla.mozilla.org/show_bug.cgi?id=600106
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*/
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#define __REV(x) __builtin_bswap32(x)
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/* stubs for efm32_dbg.h */
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typedef struct {
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uint32_t DHCSR;
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uint32_t DEMCR; /* needed by efm32tg stk trace.c */
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} CoreDebug_TypeDef;
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/* FIXME let's just hope writes to flash are protected */
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#define CoreDebug ((CoreDebug_TypeDef *) 0)
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#define CoreDebug_DHCSR_C_DEBUGEN_Msk 0
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#define CoreDebug_DEMCR_TRCENA_Msk 0
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/* stubs for efm32_dma */
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static inline void NVIC_ClearPendingIRQ(uint8_t irqn)
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{
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nvic_clear_pending_irq(irqn);
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}
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static inline void NVIC_EnableIRQ(uint8_t irqn)
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{
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nvic_enable_irq(irqn);
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}
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static inline void NVIC_DisableIRQ(uint8_t irqn)
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{
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nvic_disable_irq(irqn);
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}
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/* stubs for efm32_int */
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static inline void __enable_irq(void)
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{
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cm_enable_interrupts();
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}
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static inline void __disable_irq(void)
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{
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cm_disable_interrupts();
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}
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/* stubs for efm32_mpu FIXME */
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#define SCB_SHCSR_MEMFAULTENA_Msk 0
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typedef struct {
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uint32_t CTRL;
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uint32_t RNR;
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uint32_t RBAR;
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uint32_t RASR;
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} MPU_TypeDef;
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/* FIXME struct at NULL */
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#define MPU ((MPU_TypeDef *) 0)
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#define MPU_CTRL_ENABLE_Msk 0
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#define MPU_RASR_XN_Pos 0
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#define MPU_RASR_AP_Pos 0
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#define MPU_RASR_TEX_Pos 0
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#define MPU_RASR_S_Pos 0
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#define MPU_RASR_C_Pos 0
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#define MPU_RASR_B_Pos 0
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#define MPU_RASR_SRD_Pos 0
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#define MPU_RASR_SIZE_Pos 0
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#define MPU_RASR_ENABLE_Pos 0
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/* required for the blink example */
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/* if if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) while (1) ;
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* configures the sys ticks to 1ms, then the argument to SysTick_Config
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* describes how many cycles to wait between two systicks.
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*
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* the endless loop part looks like an "if it returns an error condition,
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* rather loop here than continue"; every other solution would involve things
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* that are dark magic to my understanding.
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*
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* implementation more or less copypasted from lib/stm32/systick.c, FIXME until
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* the generic cm3 functionality is moved out from stm32 and can be used here
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* easily (systick_set_reload, systick_interrupt_enable, systick_counter_enable
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* and systick_set_clocksource).
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*
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* modified for CMSIS style array as the powertest example needs it.
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* */
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/* from d0002_efm32_cortex-m3_reference_manual.pdf section 4.4 */
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typedef struct {
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uint32_t CTRL;
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uint32_t LOAD;
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uint32_t VAL;
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uint32_t CALIB;
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} SysTick_TypeDef;
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#define SysTick ((SysTick_TypeDef *) SYS_TICK_BASE)
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static inline uint32_t SysTick_Config(uint32_t n_ticks)
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{
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/* constant from systick_set_reload -- as this returns something that's
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* not void, this is the only possible error condition */
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if (n_ticks & ~0x00FFFFFF) {
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return 1;
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}
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systick_set_reload(n_ticks);
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systick_set_clocksource(true);
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systick_interrupt_enable();
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systick_counter_enable();
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return 0;
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}
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/* stubs for efm32tg stk trace.c */
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typedef struct {
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uint32_t LAR;
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uint32_t TCR;
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} ITM_TypeDef;
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/* FIXME struct at NULL */
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#define ITM ((ITM_TypeDef *) 0)
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/* blink.h expects the isr for systicks to be named SysTick_Handler. with this,
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* its Systick_Handler function gets renamed to the weak symbol exported by
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* vector.c */
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#define SysTick_Handler sys_tick_handler
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/* FIXME: this needs to be done for all of the 14 hard vectors */
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#include <libopencmsis/dispatch/irqhandlers.h>
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#endif
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