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r61523: fix newer screens variant

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Yann MAGNIN 2025-03-21 09:30:54 +01:00
parent 256487cc7e
commit 38eb777d02
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GPG key ID: D82629D933EADC59
1 changed files with 51 additions and 13 deletions
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64
src/r61523/r61523.c
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@ -17,12 +17,18 @@
#define REG_VRANGE 0x2b
#define REG_DATA 0x2c
#define REG_DEVICE_CODE_READ 0xbf
#define REG_DEVICE_CODE_VARIANT 0xda
/* Interface with the controller */
static volatile uint16_t *DISPLAY = (void *)0xb4000000;
/* Bit 4 of Port R controls the RS bit of the display driver */
static volatile uint8_t *PRDR = (void *)0xa405013c;
/* Screen variant information
* This number is 0x00 for the old R61523 that everyone knows, and 0x16 or
* 0x52 for the newer ones found in recent FXCP400 devices. */
static uint16_t r61523_variant = 0;
/* Select a register */
GINLINE static void select(uint16_t reg)
{
@ -56,16 +62,38 @@ static void read_Nu16(uint16_t *array, int N)
// Generic functions
//---
void r61523_identify(uint32_t *manufacturerCode, uint16_t *deviceCode)
{
select(REG_DEVICE_CODE_READ);
/* r61523_identify() - identify screen hardware information
*
* notes
* Since recent versions of the FXCP400, new screens are used that break
* the current driver. These screens are particular since they have the
* same manufacturer / device code, but they use an undocumented register
* (0xda) to determine the variant.
*
* The register 0xda should be read twice. Casio ignores the first reading
* and only keep track of the second. So, let's do the same here. */
void r61523_identify(
uint32_t *manufacturerCode,
uint16_t *deviceCode,
uint16_t *variant
) {
uint16_t packets[5];
read_Nu16(packets, 5);
if(manufacturerCode)
*manufacturerCode = (packets[1] << 16) | packets[2];
if(deviceCode)
*deviceCode = (packets[3] << 16) | packets[4];
if (manufacturerCode != NULL || deviceCode != NULL)
{
select(REG_DEVICE_CODE_READ);
read_Nu16(packets, 5);
if(manufacturerCode)
*manufacturerCode = (packets[1] << 16) | packets[2];
if(deviceCode)
*deviceCode = (packets[3] << 16) | packets[4];
}
if (variant)
{
select(REG_DEVICE_CODE_VARIANT);
*variant = read();
*variant = read();
}
}
//---
@ -74,10 +102,13 @@ void r61523_identify(uint32_t *manufacturerCode, uint16_t *deviceCode)
void r61523_win_set(int x1, int x2, int y1, int y2)
{
/* R61523 has a 360x640 area; the CP-400 uses the top-right corner for its
320x528 display, so skip over the first 40 columns */
x1 += 40;
x2 += 40;
if (r61523_variant != 0x16 || r61523_variant != 0x52)
{
/* R61523 has a 360x640 area; the CP-400 uses the top-right corner
* for its 320x528 display, so skip over the first 40 columns */
x1 += 40;
x2 += 40;
}
uint16_t volatile *DISPLAY = (void *)0xb4000000;
@ -168,10 +199,17 @@ static bool r61523_update(int x, int y, image_t const *fb, int flags)
// Driver metadata
//---
/* constructor() - determine which variant of screen we have */
static void constructor(void)
{
r61523_identify(NULL, NULL, &r61523_variant);
}
/* As far as I can tell there's no way to read the current window from the
controller so this driver is completely stateless for now. */
gint_driver_t drv_r61523 = {
.name = "R61523",
.name = "R61523",
.constructor = constructor,
};
GINT_DECLARE_DRIVER(26, drv_r61523);