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Fix fruit jam psram #58

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Fix fruit jam psram #58

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0ac1d4c
fix timing for PSRAM along with graphics on fruit jam
apiarian Feb 17, 2026
f63d847
clean up the fix and apply it to ulisp-arm-comments.ino too
apiarian Feb 17, 2026
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12 changes: 11 additions & 1 deletion ulisp-arm-comments.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -354,7 +354,7 @@ const char LispLibrary[] = "";
#define CPU_RP2350

#elif defined(ARDUINO_ADAFRUIT_FRUITJAM_RP2350)
// #define BOARD_HAS_PSRAM /* Uncomment to use PSRAM */
#define BOARD_HAS_PSRAM /* Enable 8MB PSRAM → 1M Lisp objects */
#if defined(BOARD_HAS_PSRAM)
#undef MEMBANK
#define MEMBANK PSRAM
Expand Down Expand Up @@ -9989,6 +9989,16 @@ void setup () {
Serial.begin(9600);
int start = millis();
while ((millis() - start) < 5000) { if (Serial) break; }
#if defined(ARDUINO_ADAFRUIT_FRUITJAM_RP2350) && defined(BOARD_HAS_PSRAM)
// The DVHSTX library's global constructor (init_priority 101) changes clk_sys
// from 125 MHz to 240 MHz AFTER the Arduino core's PSRAM init ran at 125 MHz.
// The PSRAM QMI timing (divisor, rxdelay) must be recalculated for the actual
// clock speed, otherwise PSRAM SCK = 240/2 = 120 MHz exceeds the 109 MHz max.
{
extern void psram_reinit_timing(uint32_t hz);
psram_reinit_timing(0); // 0 = auto-detect current clk_sys
}
#endif
initworkspace();
initenv();
initsleep();
Expand Down
12 changes: 11 additions & 1 deletion ulisp-arm.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -354,7 +354,7 @@ const char LispLibrary[] = "";
#define CPU_RP2350

#elif defined(ARDUINO_ADAFRUIT_FRUITJAM_RP2350)
// #define BOARD_HAS_PSRAM /* Uncomment to use PSRAM */
#define BOARD_HAS_PSRAM /* Enable 8MB PSRAM → 1M Lisp objects */
#if defined(BOARD_HAS_PSRAM)
#undef MEMBANK
#define MEMBANK PSRAM
Expand Down Expand Up @@ -8456,6 +8456,16 @@ void setup () {
Serial.begin(9600);
int start = millis();
while ((millis() - start) < 5000) { if (Serial) break; }
#if defined(ARDUINO_ADAFRUIT_FRUITJAM_RP2350) && defined(BOARD_HAS_PSRAM)
// The DVHSTX library's global constructor (init_priority 101) changes clk_sys
// from 125 MHz to 240 MHz AFTER the Arduino core's PSRAM init ran at 125 MHz.
// The PSRAM QMI timing (divisor, rxdelay) must be recalculated for the actual
// clock speed, otherwise PSRAM SCK = 240/2 = 120 MHz exceeds the 109 MHz max.
{
extern void psram_reinit_timing(uint32_t hz);
psram_reinit_timing(0); // 0 = auto-detect current clk_sys
}
#endif
initworkspace();
initenv();
initsleep();
Expand Down