diff options
Diffstat (limited to 'tcl/target')
| -rwxr-xr-x | tcl/target/stm32f7x.cfg | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tcl/target/stm32f7x.cfg b/tcl/target/stm32f7x.cfg index 98f3eea3..562de30f 100755 --- a/tcl/target/stm32f7x.cfg +++ b/tcl/target/stm32f7x.cfg @@ -84,6 +84,45 @@ $_TARGETNAME configure -event trace-config { } $_TARGETNAME configure -event reset-init { + # If the HSE was previously enabled and the external clock source + # disappeared, RCC_CR.HSERDY can get stuck at 1 and the PLL cannot be + # properly switched back to HSI. This situation persists even over a system + # reset, including a pin reset via SRST. However, activating the clock + # security system will detect the problem and clear HSERDY to 0, which in + # turn allows the PLL to switch back to HSI properly. Since we just came + # out of reset, HSEON should be 0. If HSERDY is 1, then this situation must + # have happened; in that case, activate the clock security system to clear + # HSERDY. + if {[mrw 0x40023800] & 0x00020000} { + mmw 0x40023800 0x00090000 0 ;# RCC_CR = CSSON | HSEON + sleep 10 ;# Wait for CSS to fire, if it wants to + mmw 0x40023800 0 0x00090000 ;# RCC_CR &= ~CSSON & ~HSEON + mww 0x4002380C 0x00800000 ;# RCC_CIR = CSSC + sleep 1 ;# Wait for CSSF to clear + } + + # If the clock security system fired, it will pend an NMI. A pending NMI + # will cause a bad time for any subsequent executing code, such as a + # programming algorithm. + if {[mrw 0xE000ED04] & 0x80000000} { + # ICSR.NMIPENDSET reads as 1. Need to clear it. A pending NMI can’t be + # cleared by any normal means (such as ICSR or NVIC). It can only be + # cleared by entering the NMI handler or by resetting the processor. + echo "[target current]: Clock security system generated NMI. Clearing." + + # Keep the old DEMCR value. + set old [mrw 0xE000EDFC] + + # Enable vector catch on reset. + mww 0xE000EDFC 0x01000001 + + # Issue local reset via AIRCR. + mww 0xE000ED0C 0x05FA0001 + + # Restore old DEMCR value. + mww 0xE000EDFC $old + } + # Configure PLL to boost clock to HSI x 10 (160 MHz) mww 0x40023804 0x08002808 ;# RCC_PLLCFGR 16 Mhz /10 (M) * 128 (N) /2(P) mww 0x40023C00 0x00000107 ;# FLASH_ACR = PRFTBE | 7(Latency) |