McHCK now working with UART.
- Lots of code cleanup for the intialization of all arm chips - Added more gcc flags to help with debugging linker and memory map - Fixed UART initialization for the smaller MCHCK mk20dx128 (different pin mux)
This commit is contained in:
Jacob Alexander
parent
0365d517fe
commit
f9e1600b28
@ -21,8 +21,8 @@ set( CHIP
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# "atmega32u4" # Teensy 2.0 (avr)
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# "at90usb646" # Teensy++ 1.0 (avr)
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# "at90usb1286" # Teensy++ 2.0 (avr)
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"mk20dx128" # Teensy 3.0 (arm)
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# "mk20dx128vlf5" # McHCK mk20dx128vlf5
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# "mk20dx128" # Teensy 3.0 (arm)
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"mk20dx128vlf5" # McHCK mk20dx128vlf5
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# "mk20dx256" # Teensy 3.1 (arm)
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)
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@ -109,7 +109,7 @@ set( WARN "-Wall -g" )
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#| Tuning Options
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#| -f...: tuning, see GCC manual
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#| NOTE: -fshort-wchar is specified to allow USB strings be passed conveniently
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set( TUNING "-mthumb -nostdlib -fdata-sections -ffunction-sections -fshort-wchar" )
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set( TUNING "-mthumb -nostdlib -fdata-sections -ffunction-sections -fshort-wchar -fno-builtin -flto -fno-use-linker-plugin" )
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#| Optimization level, can be [0, 1, 2, 3, s].
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@ -136,7 +136,7 @@ add_definitions( "-mcpu=${CPU} -DF_CPU=${F_CPU} -D_${CHIP}_=1 -O${OPT} ${TUNING}
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#| Linker Flags
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set( LINKER_FLAGS "-mcpu=${CPU} -Wl,-Map=link.map,--cref -Wl,--gc-sections -mthumb -Wl,--no-wchar-size-warning -T${CMAKE_CURRENT_SOURCE_DIR}/Lib/${CHIP}.ld" )
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set( LINKER_FLAGS "-mcpu=${CPU} -Wl,-Map=link.map,--cref -Wl,--gc-sections -mthumb -Wl,--no-wchar-size-warning -T${CMAKE_CURRENT_SOURCE_DIR}/Lib/${CHIP}.ld -nostartfiles" )
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#| Hex Flags (XXX, CMake seems to have issues if you quote the arguments for the custom commands...)
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346
Lib/mk20dx.c
346
Lib/mk20dx.c
@ -29,9 +29,13 @@
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* SOFTWARE.
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*/
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// Local Includes
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#include "mk20dx.h"
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// ----- Variables -----
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extern unsigned long _stext;
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extern unsigned long _etext;
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extern unsigned long _sdata;
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@ -39,14 +43,23 @@ extern unsigned long _edata;
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extern unsigned long _sbss;
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extern unsigned long _ebss;
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extern unsigned long _estack;
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extern int main (void);
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void ResetHandler(void);
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void __libc_init_array(void);
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void fault_isr(void)
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// ----- Function Declarations -----
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extern int main ();
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void ResetHandler();
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// ----- Interrupts -----
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// NVIC - Default ISR
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void fault_isr()
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{
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while ( 1 )
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{
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while (1) {
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// keep polling some communication while in fault
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// mode, so we don't completely die.
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if ( SIM_SCGC4 & SIM_SCGC4_USBOTG ) usb_isr();
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@ -56,114 +69,117 @@ void fault_isr(void)
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}
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}
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void unused_isr(void)
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void unused_isr()
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{
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fault_isr();
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}
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// NVIC - SysTick ISR
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extern volatile uint32_t systick_millis_count;
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void systick_default_isr(void)
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void systick_default_isr()
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{
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systick_millis_count++;
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}
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void nmi_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void hard_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void memmanage_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void bus_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usage_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void svcall_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void debugmonitor_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pendablesrvreq_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void systick_isr(void) __attribute__ ((weak, alias("systick_default_isr")));
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void dma_ch0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch4_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch5_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch6_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch7_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch8_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch9_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch10_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch11_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch12_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch13_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch14_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch15_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void mcm_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void flash_cmd_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void flash_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void low_voltage_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void wakeup_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void watchdog_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void sdhc_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_message_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_bus_off_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_tx_warn_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_rx_warn_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_wakeup_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2s0_tx_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2s0_rx_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_lon_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart1_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart1_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart2_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart2_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart3_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart3_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart4_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart4_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart5_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart5_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void adc0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void adc1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmt_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void rtc_alarm_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void rtc_seconds_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pdb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usb_charge_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dac0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dac1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void tsi0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void mcg_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void lptmr_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void porta_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portc_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portd_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void porte_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void software_isr(void) __attribute__ ((weak, alias("unused_isr")));
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// NVIC - Default ISR/Vector Linking
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void nmi_isr() __attribute__ ((weak, alias("unused_isr")));
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void hard_fault_isr() __attribute__ ((weak, alias("unused_isr")));
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void memmanage_fault_isr() __attribute__ ((weak, alias("unused_isr")));
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void bus_fault_isr() __attribute__ ((weak, alias("unused_isr")));
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void usage_fault_isr() __attribute__ ((weak, alias("unused_isr")));
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void svcall_isr() __attribute__ ((weak, alias("unused_isr")));
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void debugmonitor_isr() __attribute__ ((weak, alias("unused_isr")));
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void pendablesrvreq_isr() __attribute__ ((weak, alias("unused_isr")));
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void systick_isr() __attribute__ ((weak, alias("systick_default_isr")));
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void dma_ch0_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch1_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch2_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch3_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch4_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch5_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch6_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch7_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch8_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch9_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch10_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch11_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch12_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch13_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch14_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_ch15_isr() __attribute__ ((weak, alias("unused_isr")));
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void dma_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void mcm_isr() __attribute__ ((weak, alias("unused_isr")));
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void flash_cmd_isr() __attribute__ ((weak, alias("unused_isr")));
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void flash_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void low_voltage_isr() __attribute__ ((weak, alias("unused_isr")));
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void wakeup_isr() __attribute__ ((weak, alias("unused_isr")));
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void watchdog_isr() __attribute__ ((weak, alias("unused_isr")));
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void i2c0_isr() __attribute__ ((weak, alias("unused_isr")));
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void i2c1_isr() __attribute__ ((weak, alias("unused_isr")));
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void i2c2_isr() __attribute__ ((weak, alias("unused_isr")));
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void spi0_isr() __attribute__ ((weak, alias("unused_isr")));
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void spi1_isr() __attribute__ ((weak, alias("unused_isr")));
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void spi2_isr() __attribute__ ((weak, alias("unused_isr")));
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void sdhc_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_message_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_bus_off_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_tx_warn_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_rx_warn_isr() __attribute__ ((weak, alias("unused_isr")));
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void can0_wakeup_isr() __attribute__ ((weak, alias("unused_isr")));
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void i2s0_tx_isr() __attribute__ ((weak, alias("unused_isr")));
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void i2s0_rx_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart0_lon_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart0_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart0_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart1_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart1_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart2_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart2_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart3_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart3_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart4_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart4_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart5_status_isr() __attribute__ ((weak, alias("unused_isr")));
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void uart5_error_isr() __attribute__ ((weak, alias("unused_isr")));
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void adc0_isr() __attribute__ ((weak, alias("unused_isr")));
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void adc1_isr() __attribute__ ((weak, alias("unused_isr")));
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void cmp0_isr() __attribute__ ((weak, alias("unused_isr")));
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void cmp1_isr() __attribute__ ((weak, alias("unused_isr")));
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void cmp2_isr() __attribute__ ((weak, alias("unused_isr")));
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void ftm0_isr() __attribute__ ((weak, alias("unused_isr")));
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void ftm1_isr() __attribute__ ((weak, alias("unused_isr")));
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void ftm2_isr() __attribute__ ((weak, alias("unused_isr")));
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void ftm3_isr() __attribute__ ((weak, alias("unused_isr")));
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void cmt_isr() __attribute__ ((weak, alias("unused_isr")));
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void rtc_alarm_isr() __attribute__ ((weak, alias("unused_isr")));
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void rtc_seconds_isr() __attribute__ ((weak, alias("unused_isr")));
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void pit0_isr() __attribute__ ((weak, alias("unused_isr")));
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void pit1_isr() __attribute__ ((weak, alias("unused_isr")));
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void pit2_isr() __attribute__ ((weak, alias("unused_isr")));
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void pit3_isr() __attribute__ ((weak, alias("unused_isr")));
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void pdb_isr() __attribute__ ((weak, alias("unused_isr")));
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void usb_isr() __attribute__ ((weak, alias("unused_isr")));
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void usb_charge_isr() __attribute__ ((weak, alias("unused_isr")));
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void dac0_isr() __attribute__ ((weak, alias("unused_isr")));
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void dac1_isr() __attribute__ ((weak, alias("unused_isr")));
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void tsi0_isr() __attribute__ ((weak, alias("unused_isr")));
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void mcg_isr() __attribute__ ((weak, alias("unused_isr")));
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void lptmr_isr() __attribute__ ((weak, alias("unused_isr")));
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void porta_isr() __attribute__ ((weak, alias("unused_isr")));
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void portb_isr() __attribute__ ((weak, alias("unused_isr")));
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void portc_isr() __attribute__ ((weak, alias("unused_isr")));
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void portd_isr() __attribute__ ((weak, alias("unused_isr")));
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void porte_isr() __attribute__ ((weak, alias("unused_isr")));
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void software_isr() __attribute__ ((weak, alias("unused_isr")));
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// TODO: create AVR-stype ISR() macro, with default linkage to undefined handler
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//
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// NVIC - Interrupt Vector Table
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__attribute__ ((section(".vectors"), used))
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void (* const gVectors[])(void) =
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void (* const gVectors[])() =
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{
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(void (*)(void))((unsigned long)&_estack), // 0 ARM: Initial Stack Pointer
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ResetHandler, // 1 ARM: Initial Program Counter
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@ -328,32 +344,26 @@ void (* const gVectors[])(void) =
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};
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#if defined(_mk20dx128_) || defined(_mk20dx256_)
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// ----- Flash Configuration -----
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// Only necessary for Teensy 3s, MCHCK uses the Bootloader to handle this
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#if defined(_mk20dx128_) || defined(_mk20dx256_)
|
||||
__attribute__ ((section(".flashconfig"), used))
|
||||
const uint8_t flashconfigbytes[16] = {
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
||||
0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
// Automatically initialize the RTC. When the build defines the compile
|
||||
// time, and the user has added a crystal, the RTC will automatically
|
||||
// begin at the time of the first upload.
|
||||
#ifndef TIME_T
|
||||
#define TIME_T 1349049600 // default 1 Oct 2012 (never used, Arduino sets this)
|
||||
#endif
|
||||
extern void rtc_set(unsigned long t);
|
||||
|
||||
// ----- Chip Entry Point -----
|
||||
|
||||
__attribute__ ((section(".startup")))
|
||||
void ResetHandler(void)
|
||||
void ResetHandler()
|
||||
{
|
||||
uint32_t *src = &_etext;
|
||||
uint32_t *dest = &_sdata;
|
||||
unsigned int i;
|
||||
|
||||
/* Disable Watchdog */
|
||||
WDOG_UNLOCK = WDOG_UNLOCK_SEQ1;
|
||||
@ -370,75 +380,75 @@ void ResetHandler(void)
|
||||
SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL;
|
||||
#endif
|
||||
|
||||
#if defined(_mk20dx128_) || defined(_mk20dx256_) // Teensy 3s
|
||||
// if the RTC oscillator isn't enabled, get it started early
|
||||
if (!(RTC_CR & RTC_CR_OSCE)) {
|
||||
if ( !(RTC_CR & RTC_CR_OSCE) )
|
||||
{
|
||||
RTC_SR = 0;
|
||||
RTC_CR = RTC_CR_SC16P | RTC_CR_SC4P | RTC_CR_OSCE;
|
||||
}
|
||||
#endif
|
||||
|
||||
// release I/O pins hold, if we woke up from VLLS mode
|
||||
if (PMC_REGSC & PMC_REGSC_ACKISO) PMC_REGSC |= PMC_REGSC_ACKISO;
|
||||
|
||||
// TODO: do this while the PLL is waiting to lock....
|
||||
// Prepare RAM
|
||||
while ( dest < &_edata ) *dest++ = *src++;
|
||||
dest = &_sbss;
|
||||
while ( dest < &_ebss ) *dest++ = 0;
|
||||
SCB_VTOR = 0; // use vector table in flash
|
||||
|
||||
// default all interrupts to medium priority level
|
||||
for (i=0; i < NVIC_NUM_INTERRUPTS; i++) NVIC_SET_PRIORITY(i, 128);
|
||||
|
||||
// MCHCK
|
||||
#if defined(_mk20dx128vlf5_)
|
||||
/* FLL at 48MHz */
|
||||
MCG_C4 = MCG_C4_DMX32 | MCG_C4_DRST_DRS( 1 );
|
||||
|
||||
#if F_CPU == 96000000
|
||||
// config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash
|
||||
SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3);
|
||||
#elif F_CPU == 48000000
|
||||
// config divisors: 48 MHz core, 48 MHz bus, 24 MHz flash
|
||||
SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3);
|
||||
#elif F_CPU == 24000000
|
||||
// config divisors: 24 MHz core, 24 MHz bus, 24 MHz flash
|
||||
SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3);
|
||||
//SIM_SOPT2 = SIM_SOPT2_PLLFLLSEL;
|
||||
SIM_SOPT2 = SIM_SOPT2_USBSRC | SIM_SOPT2_PLLFLLSEL | SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL( 6 );
|
||||
|
||||
// Teensy 3.0 and 3.1
|
||||
#else
|
||||
#error "Error, F_CPU must be 96000000, 48000000, or 24000000"
|
||||
#endif
|
||||
unsigned int i;
|
||||
|
||||
// switch to PLL as clock source, FLL input = 16 MHz / 512
|
||||
MCG_C1 = MCG_C1_CLKS(0) | MCG_C1_FRDIV(4);
|
||||
SCB_VTOR = 0; // use vector table in flash
|
||||
|
||||
// configure USB for 48 MHz clock
|
||||
SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1); // USB = 96 MHz PLL / 2
|
||||
// default all interrupts to medium priority level
|
||||
for ( i = 0; i < NVIC_NUM_INTERRUPTS; i++ )
|
||||
{
|
||||
NVIC_SET_PRIORITY( i, 128 );
|
||||
}
|
||||
|
||||
SIM_SOPT2 = SIM_SOPT2_PLLFLLSEL;
|
||||
|
||||
// initialize the SysTick counter
|
||||
SYST_RVR = (F_CPU / 1000) - 1;
|
||||
SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_TICKINT | SYST_CSR_ENABLE;
|
||||
#else
|
||||
// start in FEI mode
|
||||
// enable capacitors for crystal
|
||||
OSC0_CR = OSC_SC8P | OSC_SC2P;
|
||||
|
||||
// enable osc, 8-32 MHz range, low power mode
|
||||
MCG_C2 = MCG_C2_RANGE0( 2 ) | MCG_C2_EREFS;
|
||||
|
||||
// switch to crystal as clock source, FLL input = 16 MHz / 512
|
||||
MCG_C1 = MCG_C1_CLKS( 2 ) | MCG_C1_FRDIV( 4 );
|
||||
|
||||
// wait for crystal oscillator to begin
|
||||
while ( (MCG_S & MCG_S_OSCINIT0) == 0 );
|
||||
|
||||
// wait for FLL to use oscillator
|
||||
while ( (MCG_S & MCG_S_IREFST) != 0 );
|
||||
|
||||
// wait for MCGOUT to use oscillator
|
||||
while ( (MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST( 2 ) );
|
||||
|
||||
// now we're in FBE mode
|
||||
// config PLL input for 16 MHz Crystal / 4 = 4 MHz
|
||||
MCG_C5 = MCG_C5_PRDIV0( 3 );
|
||||
|
||||
// config PLL for 96 MHz output
|
||||
MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0( 0 );
|
||||
|
||||
// wait for PLL to start using xtal as its input
|
||||
while ( !(MCG_S & MCG_S_PLLST) );
|
||||
|
||||
// wait for PLL to lock
|
||||
while ( !(MCG_S & MCG_S_LOCK0) );
|
||||
|
||||
// now we're in PBE mode
|
||||
#if F_CPU == 96000000
|
||||
// config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash
|
||||
@ -454,40 +464,46 @@ void ResetHandler(void)
|
||||
#endif
|
||||
// switch to PLL as clock source, FLL input = 16 MHz / 512
|
||||
MCG_C1 = MCG_C1_CLKS( 0 ) | MCG_C1_FRDIV( 4 );
|
||||
|
||||
// wait for PLL clock to be used
|
||||
while ( (MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST( 3 ) );
|
||||
|
||||
// now we're in PEE mode
|
||||
// configure USB for 48 MHz clock
|
||||
SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV( 1 ); // USB = 96 MHz PLL / 2
|
||||
|
||||
// USB uses PLL clock, trace is CPU clock, CLKOUT=OSCERCLK0
|
||||
SIM_SOPT2 = SIM_SOPT2_USBSRC | SIM_SOPT2_PLLFLLSEL | SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL( 6 );
|
||||
|
||||
// initialize the SysTick counter
|
||||
#endif
|
||||
// Initialize the SysTick counter
|
||||
SYST_RVR = (F_CPU / 1000) - 1;
|
||||
SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_TICKINT | SYST_CSR_ENABLE;
|
||||
|
||||
#endif
|
||||
__enable_irq();
|
||||
__libc_init_array();
|
||||
|
||||
main();
|
||||
while (1) ;
|
||||
while ( 1 ); // Shouldn't get here...
|
||||
}
|
||||
|
||||
|
||||
|
||||
// ----- RAM Setup -----
|
||||
|
||||
char *__brkval = (char *)&_ebss;
|
||||
|
||||
void * _sbrk( int incr )
|
||||
{
|
||||
//static char *heap_end = (char *)&_ebss;
|
||||
//char *prev = heap_end;
|
||||
//heap_end += incr;
|
||||
|
||||
char *prev = __brkval;
|
||||
__brkval += incr;
|
||||
return prev;
|
||||
}
|
||||
|
||||
int nvic_execution_priority(void)
|
||||
|
||||
|
||||
// ----- Interrupt Execution Priority -----
|
||||
|
||||
int nvic_execution_priority()
|
||||
{
|
||||
int priority = 256;
|
||||
uint32_t primask, faultmask, basepri, ipsr;
|
||||
@ -495,16 +511,36 @@ int nvic_execution_priority(void)
|
||||
// full algorithm in ARM DDI0403D, page B1-639
|
||||
// this isn't quite complete, but hopefully good enough
|
||||
asm volatile( "mrs %0, faultmask\n" : "=r" (faultmask):: );
|
||||
if (faultmask) return -1;
|
||||
asm volatile("mrs %0, primask\n" : "=r" (primask)::);
|
||||
if (primask) return 0;
|
||||
asm volatile("mrs %0, ipsr\n" : "=r" (ipsr)::);
|
||||
if (ipsr) {
|
||||
if (ipsr < 16) priority = 0; // could be non-zero
|
||||
else priority = NVIC_GET_PRIORITY(ipsr - 16);
|
||||
if ( faultmask )
|
||||
{
|
||||
return -1;
|
||||
}
|
||||
|
||||
asm volatile( "mrs %0, primask\n" : "=r" (primask):: );
|
||||
if ( primask )
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
asm volatile( "mrs %0, ipsr\n" : "=r" (ipsr):: );
|
||||
if ( ipsr )
|
||||
{
|
||||
if ( ipsr < 16)
|
||||
{
|
||||
priority = 0; // could be non-zero
|
||||
}
|
||||
else
|
||||
{
|
||||
priority = NVIC_GET_PRIORITY( ipsr - 16 );
|
||||
}
|
||||
}
|
||||
|
||||
asm volatile( "mrs %0, basepri\n" : "=r" (basepri):: );
|
||||
if (basepri > 0 && basepri < priority) priority = basepri;
|
||||
if ( basepri > 0 && basepri < priority )
|
||||
{
|
||||
priority = basepri;
|
||||
}
|
||||
|
||||
return priority;
|
||||
}
|
||||
|
||||
|
||||
@ -1,7 +1,34 @@
|
||||
/* -*- mode: ld-script; -*- */
|
||||
/*
|
||||
* Linker script for MK20DX128VLF5
|
||||
/* Teensyduino Core Library
|
||||
* http://www.pjrc.com/teensy/
|
||||
* Copyright (c) 2013 PJRC.COM, LLC.
|
||||
* Modifications by Jacob Alexander 2014 for use with McHCK
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining
|
||||
* a copy of this software and associated documentation files (the
|
||||
* "Software"), to deal in the Software without restriction, including
|
||||
* without limitation the rights to use, copy, modify, merge, publish,
|
||||
* distribute, sublicense, and/or sell copies of the Software, and to
|
||||
* permit persons to whom the Software is furnished to do so, subject to
|
||||
* the following conditions:
|
||||
*
|
||||
* 1. The above copyright notice and this permission notice shall be
|
||||
* included in all copies or substantial portions of the Software.
|
||||
*
|
||||
* 2. If the Software is incorporated into a build system that allows
|
||||
* selection among a list of target devices, then similar target
|
||||
* devices manufactured by PJRC.COM must be included in the list of
|
||||
* target devices and selectable in the same manner.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
MEMORY
|
||||
{
|
||||
FLASH (rx) : ORIGIN = 3K, LENGTH = 128K-3K
|
||||
@ -17,18 +44,9 @@ SECTIONS
|
||||
KEEP(* (.vectors))
|
||||
*(.startup*)
|
||||
*(.text*)
|
||||
*(.rodata*)
|
||||
. = ALIGN(4);
|
||||
KEEP(*(.init))
|
||||
. = ALIGN(4);
|
||||
__preinit_array_start = .;
|
||||
KEEP (*(.preinit_array))
|
||||
__preinit_array_end = .;
|
||||
__init_array_start = .;
|
||||
KEEP (*(SORT(.init_array.*)))
|
||||
KEEP (*(.init_array))
|
||||
__init_array_end = .;
|
||||
} > FLASH = 0xFF
|
||||
} > FLASH
|
||||
|
||||
.ARM.exidx :
|
||||
{
|
||||
|
||||
@ -98,9 +98,18 @@ void uart_serial_setup()
|
||||
// Setup the the UART interface for keyboard data input
|
||||
SIM_SCGC4 |= SIM_SCGC4_UART0; // Disable clock gating
|
||||
|
||||
// MCHCK
|
||||
#if defined(_mk20dx128vlf5_)
|
||||
// Pin Setup for UART0
|
||||
PORTA_PCR1 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(2); // RX Pin
|
||||
PORTA_PCR2 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(2); // TX Pin
|
||||
|
||||
// Teensy
|
||||
#else
|
||||
// Pin Setup for UART0
|
||||
PORTB_PCR16 = PORT_PCR_PE | PORT_PCR_PS | PORT_PCR_PFE | PORT_PCR_MUX(3); // RX Pin
|
||||
PORTB_PCR17 = PORT_PCR_DSE | PORT_PCR_SRE | PORT_PCR_MUX(3); // TX Pin
|
||||
#endif
|
||||
|
||||
// Setup baud rate - 115200 Baud
|
||||
// 48 MHz / ( 16 * Baud ) = BDH/L
|
||||
@ -115,7 +124,7 @@ void uart_serial_setup()
|
||||
// 8 bit, No Parity, Idle Character bit after stop
|
||||
UART0_C1 = UART_C1_ILT;
|
||||
|
||||
// Interrupt notification watermark
|
||||
// Interrupt notification watermarks
|
||||
UART0_TWFIFO = 2;
|
||||
UART0_RWFIFO = 4;
|
||||
|
||||
|
||||
9
main.c
9
main.c
@ -66,7 +66,7 @@ volatile uint8_t sendKeypresses = 0;
|
||||
// ----- Functions -----
|
||||
|
||||
// Initial Pin Setup, make sure they are sane
|
||||
inline void pinSetup(void)
|
||||
inline void pinSetup()
|
||||
{
|
||||
|
||||
// AVR
|
||||
@ -100,7 +100,7 @@ inline void pinSetup(void)
|
||||
}
|
||||
|
||||
|
||||
inline void usbTimerSetup(void)
|
||||
inline void usbTimerSetup()
|
||||
{
|
||||
// AVR
|
||||
#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_)
|
||||
@ -134,8 +134,7 @@ inline void usbTimerSetup(void)
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
int main(void)
|
||||
int main()
|
||||
{
|
||||
// Configuring Pins
|
||||
pinSetup();
|
||||
@ -185,7 +184,7 @@ int main(void)
|
||||
#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_) // AVR
|
||||
ISR( TIMER0_OVF_vect )
|
||||
#elif defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // ARM
|
||||
void pit0_isr(void)
|
||||
void pit0_isr()
|
||||
#endif
|
||||
{
|
||||
sendKeypressCounter++;
|
||||
|
||||
Reference in New Issue
Block a user