84 lines
2.6 KiB
Plaintext
84 lines
2.6 KiB
Plaintext
mbed fix for Infinity
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=====================
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Without linker script patch it doesn't place vector table in final binary.
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And clock is configured to 48MHz using internal clock reference and FLL multiplication.
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mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/system_MK20D5.c
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Fix SystemInit: clock setup for internal clock. Inifinity has no external Xtal.
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mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/cmsis_nvic.c
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Fix NVIC vector address of firmware 0x1000 instead of 0x0
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mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM/MK20D5.ld
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Fix memory map for Infinity bootloader
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Flash starts at 0x1000
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No flash config bytes sector
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USBDevice/USBDevice/USBHAL_KL25Z.cpp
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Fix USB clock setup, see below.
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2015/01/04 Based on mbed-sdk @2f63fa7d78a26.
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Kinetis USB config
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==================
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Clock source: Internal reference clock wth FLL
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SIM_SOPT[USBSRC] = 1(MCGPLLCLK/MCGFLLCLK)
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SIM_SOPT[PLLSEL] = 0(MCGFLLCLK)
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Clock dividor:
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SIM_CLKDIV2[USBDIV] = 0
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SIM_CLKDIV2[USBFAC] = 0
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Clock enable:
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SIM_SCGC4[USBOTG] = 1
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Infinity bootloader change
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==========================
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After @2c7542e(2015/01) Infinity bootloader doesn't disable watchdog timer and keyboard firmware has to do it itself. mbed disables watchdog in startup sequence but unfortunately timer is timed out bofore that.
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We have to do that in earlier phase of mbed startup sequence.
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mbed starup sequence files:
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mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM/startup_M20D5.s
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mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/system_MK20D5.c
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Infinity booloader change commit:
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https://github.com/kiibohd/controller/commit/2c7542e2e7f0b8a99edf563dc53164fe1a439483
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discussion:
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https://geekhack.org/index.php?topic=41989.msg1686616#msg1686616
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WORKAROUND
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----------
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Call SystemInit early in Reset_Handler.
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$ diff -u ../../mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM/startup_MK20D5.s mbed-infinity
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--- ../../mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20D50M/TOOLCHAIN_GCC_ARM/startup_MK20D5.s 2015-03-22 10:33:22.779866000 +0900
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+++ mbed-infinity/startup_MK20D5.s 2015-03-22 10:32:56.483866000 +0900
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@@ -147,6 +147,8 @@
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* __etext: End of code section, i.e., begin of data sections to copy from.
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* __data_start__/__data_end__: RAM address range that data should be
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* copied to. Both must be aligned to 4 bytes boundary. */
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+ ldr r0, =SystemInit
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+ blx r0
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ldr r1, =__etext
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ldr r2, =__data_start__
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@@ -161,8 +163,6 @@
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.Lflash_to_ram_loop_end:
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- ldr r0, =SystemInit
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- blx r0
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ldr r0, =_start
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bx r0
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.pool
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