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start with other sound chip

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This commit is contained in:
Wolfgang Hottgenroth
2024-04-09 10:32:19 +02:00
parent 20c01f2efa
commit aeb7aeb7f2
4 changed files with 161 additions and 9 deletions
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6
sound-driver/psg.c
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@ -78,11 +78,11 @@ asm volatile (
);
}
uint8_t psgReadShadow(uint8_t address) {
static uint8_t psgReadShadow(uint8_t address) {
return psgShadowRegisters[address];
}
void psgWrite(uint8_t address, uint8_t data) {
static void psgWrite(uint8_t address, uint8_t data) {
psgShadowRegisters[address] = data;
// according to "State Timing" (p. 15) of datasheet
@ -109,7 +109,7 @@ void psgWrite(uint8_t address, uint8_t data) {
BUS_OP_NACT();
}
void psgWriteFrequency(uint8_t channel, uint16_t frequencyCode) {
static void psgWriteFrequency(uint8_t channel, uint16_t frequencyCode) {
psgWrite(CHANNEL_A_TONE_PERIOD_FINE_REG + (channel * 2), (frequencyCode & 0x00ff));
psgWrite(CHANNEL_A_TONE_PERIOD_COARSE_REG + (channel * 2), ((frequencyCode >> 8) & 0x000f));
}