Use FLASHMEM for functions, not attribute progmem

teensy4/AudioStream.cpp

@@ -52,8 +52,7 @@ void software_isr(void);
 
 // Set up the pool of audio data blocks
 // placing them all onto the free list
-__attribute__((section(".progmem")))
-void AudioStream::initialize_memory(audio_block_t *data, unsigned int num)
+FLASHMEM void AudioStream::initialize_memory(audio_block_t *data, unsigned int num)
 {
 	unsigned int i;
 	unsigned int maxnum = MAX_AUDIO_MEMORY / AUDIO_BLOCK_SAMPLES / 2;

teensy4/analog.c

@@ -1,6 +1,7 @@
 #include "imxrt.h"
 #include "core_pins.h"
 #include "debug/printf.h"
+#include "avr/pgmspace.h"
 
 static uint8_t calibrating;
 static uint8_t analog_config_bits = 10;
@@ -150,8 +151,7 @@ void analogReadAveraging(unsigned int num)
 
 #define MAX_ADC_CLOCK 20000000
 
-__attribute__((section(".progmem")))
-void analog_init(void)
+FLASHMEM void analog_init(void)
 {
 	uint32_t mode, avg=0;
 

teensy4/debugprintf.c

@@ -2,6 +2,7 @@
 
 #ifdef PRINT_DEBUG_STUFF
 
+#include "avr/pgmspace.h"
 #include <stdarg.h>
 #include "imxrt.h"
 
@@ -9,8 +10,7 @@ void putchar_debug(char c);
 static void puint_debug(unsigned int num);
 
 
-__attribute__((section(".progmem")))
-void printf_debug(const char *format, ...)
+FLASHMEM void printf_debug(const char *format, ...)
 {
 	va_list args;
 	unsigned int val;
@@ -70,15 +70,13 @@ static void puint_debug(unsigned int num)
 	printf_debug(buf + i);
 }
 
-__attribute__((section(".progmem")))
-void putchar_debug(char c)
+FLASHMEM void putchar_debug(char c)
 {
 	while (!(LPUART3_STAT & LPUART_STAT_TDRE)) ; // wait
 	LPUART3_DATA = c;
 }
 
-__attribute__((section(".progmem")))
-void printf_debug_init(void)
+FLASHMEM void printf_debug_init(void)
 {
         CCM_CCGR0 |= CCM_CCGR0_LPUART3(CCM_CCGR_ON); // turn on Serial4
         IOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B1_06 = 2; // Arduino pin 17

teensy4/startup.c

@@ -1,6 +1,7 @@
 #include "imxrt.h"
 #include "wiring.h"
 #include "usb_dev.h"
+#include "avr/pgmspace.h"
 
 #include "debug/printf.h"
 
@@ -191,8 +192,7 @@ static void configure_systick(void)
 #define SIZE_64M	(SCB_MPU_RASR_SIZE(25) | SCB_MPU_RASR_ENABLE)
 #define REGION(n)	(SCB_MPU_RBAR_REGION(n) | SCB_MPU_RBAR_VALID)
 
-__attribute__((section(".progmem")))
-void configure_cache(void)
+FLASHMEM void configure_cache(void)
 {
 	//printf("MPU_TYPE = %08lX\n", SCB_MPU_TYPE);
 	//printf("CCR = %08lX\n", SCB_CCR);
@@ -236,8 +236,7 @@ void configure_cache(void)
 }
 
 
-__attribute__((section(".progmem")))
-void usb_pll_start()
+FLASHMEM void usb_pll_start()
 {
 	while (1) {
 		uint32_t n = CCM_ANALOG_PLL_USB1; // pg 759
@@ -281,8 +280,7 @@ void usb_pll_start()
 	}
 }
 
-__attribute__((section(".progmem")))
-void reset_PFD()
+FLASHMEM void reset_PFD()
 {	
 	//Reset PLL2 PFDs, set default frequencies:
 	CCM_ANALOG_PFD_528_SET = (1 << 31) | (1 << 23) | (1 << 15) | (1 << 7);

teensy4/tempmon.c

@@ -1,5 +1,6 @@
 #include "imxrt.h"
 #include "core_pins.h"
+#include "avr/pgmspace.h"
 #include "debug/printf.h"
 
 
@@ -11,8 +12,7 @@ static uint32_t panicAlarmTemp  = 90U;
 static uint32_t s_hotTemp, s_hotCount, s_roomC_hotC;
 static float s_hot_ROOM;
 
-__attribute__((section(".progmem")))
-void tempmon_init(void)
+FLASHMEM void tempmon_init(void)
 {
   // Notes:
   //    TEMPMON_TEMPSENSE0 &= ~0x2U;  Stops temp monitoring

teensy4/usb.c

@@ -3,6 +3,7 @@
 #include "usb_desc.h"
 #include "usb_serial.h"
 #include "core_pins.h" // for delay()
+#include "avr/pgmspace.h"
 #include <string.h>
 #include "debug/printf.h"
 
@@ -97,8 +98,7 @@ static void endpoint0_complete(void);
 static void run_callbacks(endpoint_t *ep);
 
 
-__attribute__((section(".progmem")))
-void usb_init(void)
+FLASHMEM void usb_init(void)
 {
 	// TODO: only enable when VBUS detected
 	// TODO: return to low power mode when VBUS removed