PaulStoffregen
4 years ago
1 changed files with 3 additions and 0 deletions
+ 3
- 0
teensy4/startup.c
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| uint32_t set_arm_clock(uint32_t frequency); // clockspeed.c | uint32_t set_arm_clock(uint32_t frequency); // clockspeed.c | ||||
| extern void __libc_init_array(void); // C++ standard library | extern void __libc_init_array(void); // C++ standard library | ||||
| uint8_t external_psram_size = 0; | |||||
| extern int main (void); | extern int main (void); | ||||
| void startup_default_early_hook(void) {} | void startup_default_early_hook(void) {} | ||||
| if (flexspi2_psram_id(0x800000) == 0x5D0D) { | if (flexspi2_psram_id(0x800000) == 0x5D0D) { | ||||
| flexspi2_command(4, 0x800000); | flexspi2_command(4, 0x800000); | ||||
| // Two PSRAM chips are present, 16 MByte | // Two PSRAM chips are present, 16 MByte | ||||
| external_psram_size = 16; | |||||
| } else { | } else { | ||||
| // One PSRAM chip is present, 8 MByte | // One PSRAM chip is present, 8 MByte | ||||
| external_psram_size = 8; | |||||
| } | } | ||||
| // TODO: zero uninitialized EXTMEM variables | // TODO: zero uninitialized EXTMEM variables | ||||
| // TODO: copy from flash to initialize EXTMEM variables | // TODO: copy from flash to initialize EXTMEM variables |
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