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Add support for read/write MAX7456 NVM for chars > 256

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Add max7456Character_t, which represents the data for character a
single MAX7456 character.
Use max7456Character_t to read and pass character data around.
Change max7456WriteNvm() to accept a 2-byte character address.
Change MSP handler for MSP_OSD_CHAR_WRITE to accept 2 byte character
addresses. To keep backwards compatibility, check wether the caller
sent 55 or 56 bytes.
Add max7456ReadNvm() to read a character from the MAX7456 NVM, which
will eventually be used for font metadata.
This commit is contained in:
Alberto García Hierro 2019-01-01 18:15:41 +00:00
parent c442a57875
commit 324a994042
3 changed files with 137 additions and 44 deletions
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15
src/main/fc/fc_msp.c
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@ -2140,13 +2140,18 @@ static mspResult_e mspFcProcessInCommand(uint16_t cmdMSP, sbuf_t *src)
case MSP_OSD_CHAR_WRITE:
#ifdef USE_MAX7456
if (dataSize >= 55) {
uint8_t font_data[64];
const uint8_t addr = sbufReadU8(src);
for (int i = 0; i < 54; i++) {
font_data[i] = sbufReadU8(src);
max7456Character_t chr;
uint16_t addr;
if (dataSize >= 56) {
addr = sbufReadU16(src);
} else {
addr = sbufReadU8(src);
}
for (unsigned ii = 0; ii < sizeof(chr.data); ii++) {
chr.data[ii] = sbufReadU8(src);
}
// !!TODO - replace this with a device independent implementation
max7456WriteNvm(addr, font_data);
max7456WriteNvm(addr, &chr);
} else
return MSP_RESULT_ERROR;
#endif // USE_MAX7456