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[PCF7931] refactor SendCmdPCF7931

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first steps in understading and optimizing this function.
replace != with < - if we don't poll fast enough, it is possible that
the condition != is missed.
This commit is contained in:
tinooo 2025-03-04 15:56:38 +01:00 • committed by Tino
commit 8723037e68
2 changed files with 6 additions and 6 deletions
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8
armsrc/pcf7931.c
View file

@ -555,7 +555,7 @@ void SendCmdPCF7931(const uint32_t *tab, bool ledcontrol) {
AT91C_BASE_PMC->PMC_PCER |= (0x1 << AT91C_ID_TC0);
AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; // clock at 48/32 MHz
AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; // clock at 48/32 MHz (48Mhz clock, 32 = prescaler (div3))
AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
// Assert a sync signal. This sets all timers to 0 on next active clock edge
@ -565,19 +565,19 @@ void SendCmdPCF7931(const uint32_t *tab, bool ledcontrol) {
for (u = 0; tab[u] != 0; u += 3) {
// modulate antenna
HIGH(GPIO_SSC_DOUT);
while (tempo != tab[u]) {
while (tempo < tab[u]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
// stop modulating antenna
LOW(GPIO_SSC_DOUT);
while (tempo != tab[u + 1]) {
while (tempo < tab[u + 1]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
// modulate antenna
HIGH(GPIO_SSC_DOUT);
while (tempo != tab[u + 2]) {
while (tempo < tab[u + 2]) {
tempo = AT91C_BASE_TC0->TC_CV;
}
}

4
client/src/cmdlfpcf7931.c
View file

@ -105,8 +105,8 @@ static int CmdLFPCF7931Config(const char *Cmd) {
arg_lit0("r", "reset", "Reset configuration to default values"),
arg_str0("p", "pwd", "<hex>", "Password, 7bytes, LSB-order"),
arg_u64_0("d", "delay", "<dec>", "Tag initialization delay (in us)"),
arg_int0(NULL, "lw", "<dec>", "offset, low pulses width (in us)"),
arg_int0(NULL, "lp", "<dec>", "offset, low pulses position (in us)"),
arg_int0(NULL, "lw", "<dec>", "offset, low pulses width (in us), optional!"),
arg_int0(NULL, "lp", "<dec>", "offset, low pulses position (in us), optional!"),
arg_param_end
};
CLIExecWithReturn(ctx, Cmd, argtable, true);