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Reducing IMEM footprint in flash routines

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logicog
2025-09-30 20:45:44 +02:00
parent 110c403443
commit 05492e601a
5 changed files with 69 additions and 52 deletions
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rtl837x_flash.c
+29 -28
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@@ -10,6 +10,7 @@
__xdata uint8_t dio_enabled;
__xdata uint8_t markbuf[16];
extern __xdata uint16_t mpos;
__xdata uint32_t flash_addr;
// For the flash commands, see e.g. Windbond W25Q32JV datasheet
#define CMD_WRITE_STATUS 0x01
@@ -36,7 +37,7 @@ void flash_configure_mmio(void)
}
SFR_FLASH_MODEB = 0x0;
SFR_FLASH_CMD_R = 0xb; // Default is Single IO
SFR_FLASH_CMD_R = CMD_FREAD; // Default is Single IO
SFR_FLASH_DUMMYCYCLES = 8;
}
@@ -184,7 +185,7 @@ void flash_write_enable(void)
}
void flash_dump(register uint32_t addr, register uint8_t len)
void flash_dump(uint8_t len)
{
short status;
do {
@@ -205,10 +206,10 @@ void flash_dump(register uint32_t addr, register uint8_t len)
// Read 4 bytes
SFR_FLASH_TCONF = 4;
while (len) {
SFR_FLASH_ADDR16 = addr >> 16;
SFR_FLASH_ADDR8 = addr >> 8;
SFR_FLASH_ADDR0 = addr;
addr += 4;
SFR_FLASH_ADDR16 = flash_addr >> 16;
SFR_FLASH_ADDR8 = flash_addr >> 8;
SFR_FLASH_ADDR0 = flash_addr;
flash_addr += 4;
SFR_FLASH_EXEC_GO = 1;
while(SFR_FLASH_EXEC_BUSY);
@@ -232,7 +233,7 @@ void flash_dump(register uint32_t addr, register uint8_t len)
* Reads bulk data of length len from the flash memory starging at address src
* and writes the data into a buffer pointed to by dst in XMEM
*/
void flash_read_bulk(register __xdata uint8_t *dst, __xdata uint32_t src, register uint16_t len)
void flash_read_bulk(__xdata uint8_t *dst, register uint16_t len)
{
short status;
do {
@@ -252,10 +253,10 @@ void flash_read_bulk(register __xdata uint8_t *dst, __xdata uint32_t src, regist
// Read 4 bytes
SFR_FLASH_TCONF = 4;
while (len) {
SFR_FLASH_ADDR16 = src >> 16;
SFR_FLASH_ADDR8 = src >> 8;
SFR_FLASH_ADDR0 = src;
src += 4;
SFR_FLASH_ADDR16 = flash_addr >> 16;
SFR_FLASH_ADDR8 = flash_addr >> 8;
SFR_FLASH_ADDR0 = flash_addr;
flash_addr += 4;
SFR_FLASH_EXEC_GO = 1;
while(SFR_FLASH_EXEC_BUSY);
@@ -276,9 +277,9 @@ void flash_read_bulk(register __xdata uint8_t *dst, __xdata uint32_t src, regist
}
void flash_find_mark(__xdata uint32_t src, register uint16_t len, __code uint8_t *mark)
void flash_find_mark(__code uint8_t *mark, __xdata uint16_t len)
{
uint16_t status;
__xdata uint16_t status;
do {
status = flash_read_status();
} while (status & 0x1);
@@ -294,9 +295,9 @@ void flash_find_mark(__xdata uint32_t src, register uint16_t len, __code uint8_t
SFR_FLASH_DUMMYCYCLES = 8; // Add 8 dummy clocks after read?
}
uint8_t i = 0;
uint8_t l = 0;
uint8_t k;
__xdata uint8_t i = 0;
__xdata uint8_t l = 0;
__xdata uint8_t k;
// Calculate the length
while (mark[i++])
@@ -310,10 +311,10 @@ void flash_find_mark(__xdata uint32_t src, register uint16_t len, __code uint8_t
i = 0;
SFR_FLASH_TCONF = 4;
while (len) {
SFR_FLASH_ADDR16 = src >> 16;
SFR_FLASH_ADDR8 = src >> 8;
SFR_FLASH_ADDR0 = src;
src += 4;
SFR_FLASH_ADDR16 = flash_addr >> 16;
SFR_FLASH_ADDR8 = flash_addr >> 8;
SFR_FLASH_ADDR0 = flash_addr;
flash_addr += 4;
SFR_FLASH_EXEC_GO = 1;
while(SFR_FLASH_EXEC_BUSY);
@@ -408,27 +409,27 @@ void flash_sector_erase(uint32_t addr)
while (flash_read_status() & 0x1);
flash_configure_mmio();
}
void flash_write_bytes(__xdata uint32_t addr, __xdata uint8_t *ptr, uint16_t len)
void flash_write_bytes(__xdata uint8_t *ptr, __xdata uint16_t len)
{
uint8_t exit_loop = 0;
__xdata uint8_t exit_loop = 0;
write_char('>'); print_long(flash_addr); write_char(':'); print_short(len); write_char('-'); print_byte(*ptr); write_char('\n');
while(1) {
flash_write_enable();
SFR_FLASH_CMD = CMD_PAGE_PROGRAM;
SFR_FLASH_TCONF = 0x40 | 8 | 4; // Bytes written is is 4, 8 enables write, 0x40 is unkown
SFR_FLASH_TCONF = 0x40 | 8 | 4; // Bytes written is 4, 8 enables write, 0x40 is unknown
// Last transfer?
if (len < 5) {
SFR_FLASH_TCONF = 8 | len;
exit_loop = 1;
}
SFR_FLASH_ADDR16 = addr >> 16;
SFR_FLASH_ADDR8 = addr >> 8;
SFR_FLASH_ADDR0 = addr;
SFR_FLASH_ADDR16 = flash_addr >> 16;
SFR_FLASH_ADDR8 = flash_addr >> 8;
SFR_FLASH_ADDR0 = flash_addr;
SFR_FLASH_DATA0 = *ptr++;
SFR_FLASH_DATA8 = *ptr++;
SFR_FLASH_DATA16 = *ptr++;
@@ -439,7 +440,7 @@ void flash_write_bytes(__xdata uint32_t addr, __xdata uint8_t *ptr, uint16_t len
if (exit_loop)
break;
len -= 4;
addr += 4;
flash_addr += 4;
}
while (flash_read_status() & 0x1);