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Increase scratch ROM size for galp3-c

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This commit is contained in:
Jeremy Soller 2020-01-15 16:26:10 -07:00
parent 93545fb83c
commit ac12a91f56
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GPG Key ID: E988B49EE78A7FB1
2 changed files with 24 additions and 15 deletions
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37
src/board/system76/galp3-c/scratch.c
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@ -3,13 +3,17 @@
#include <common/macro.h>
// Include scratch ROM, must be less than 2048 bytes, controlled by makefile
// Include scratch ROM, must be less than 4096 bytes, controlled by makefile
uint8_t __code scratch_rom[] = {
#include <scratch.h>
};
// Scratch RAM 1, 2, 3, and 4 are 2048 bytes total, located at 0x0800 bytes
volatile uint8_t __xdata __at(0x0800) scratch_ram[2048];
// Scratch RAM 0, 1, 2, 3, and 4 are 4096 bytes total, located at 0x0000 bytes
volatile uint8_t __xdata __at(0x0000) scratch_ram[4096];
volatile uint8_t __xdata __at(0x1040) SCAR0L;
volatile uint8_t __xdata __at(0x1041) SCAR0M;
volatile uint8_t __xdata __at(0x1042) SCAR0H;
volatile uint8_t __xdata __at(0x1043) SCAR1L;
volatile uint8_t __xdata __at(0x1044) SCAR1M;
@ -39,11 +43,12 @@ static void scratch_start(void) __naked {
// Enter or exit scratch ROM
void scratch_trampoline(void) {
// Uses SCAR1, 2, 3, and 4 which are mapped at 0x0800 in data space and are
// 2048 bytes in size. SCAR0 cannot be used due to __pdata overwriting it.
// Uses SCAR0, 1, 2, 3, and 4 which are mapped at 0x0000 in data space and are
// 4096 bytes in size.
if ((SCAR1H == 0x00) || (SCAR2H == 0x00) || (SCAR3H == 0x00) || (SCAR4H == 0x00)) {
if ((SCAR0H == 0x00) || (SCAR1H == 0x00) || (SCAR2H == 0x00) || (SCAR3H == 0x00) || (SCAR4H == 0x00)) {
// Disable scratch RAM mapping
SCAR0H = 0b11;
SCAR1H = 0b11;
SCAR2H = 0b11;
SCAR3H = 0b11;
@ -60,21 +65,25 @@ void scratch_trampoline(void) {
scratch_ram[i] = 0x00;
}
// Set scratch RAM 1 mapping at 0x0000 and enable
// Set scratch RAM 0 mapping at 0x0000 and enable
SCAR0L = 0x00;
SCAR0M = 0x00;
SCAR0H = 0x00;
// Set scratch RAM 1 mapping at 0x0800 and enable
SCAR1L = 0x00;
SCAR1M = 0x00;
SCAR1M = 0x08;
SCAR1H = 0x00;
// Set scratch RAM 2 mapping at 0x0400 and enable
// Set scratch RAM 2 mapping at 0x0C00 and enable
SCAR2L = 0x00;
SCAR2M = 0x04;
SCAR2M = 0x0C;
SCAR2H = 0x00;
// Set scratch RAM 3 mapping at 0x0600 and enable
// Set scratch RAM 3 mapping at 0x0E00 and enable
SCAR3L = 0x00;
SCAR3M = 0x06;
SCAR3M = 0x0E;
SCAR3H = 0x00;
// Set scratch RAM 4 mapping at 0x0700 and enable
// Set scratch RAM 4 mapping at 0x0F00 and enable
SCAR4L = 0x00;
SCAR4M = 0x07;
SCAR4M = 0x0F;
SCAR4H = 0x00;
}

2
src/board/system76/galp3-c/scratch/scratch.mk
View File

@ -16,7 +16,7 @@ SCRATCH_CC=\
sdcc \
-mmcs51 \
--model-small \
--code-size 2048 \
--code-size 4096 \
--Werror
# Convert from binary file to C header