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Remove unnecessary memory barriers

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This commit is contained in:
RetiredWizard 2023-02-13 19:46:35 -05:00
parent dcb6955fa5
commit 39d3d97ea4
1 changed files with 1 additions and 10 deletions
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11
ports/broadcom/common-hal/neopixel_write/__init__.c
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@ -96,9 +96,7 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout,
// Wait for the clock to start up.
COMPLETE_MEMORY_READS;
icnt = 0;
while ((CM_PWM->CS_b.BUSY == 0) && (icnt++ < 1000)) {
COMPLETE_MEMORY_READS;
}
while ((CM_PWM->CS_b.BUSY == 0) && (icnt++ < 1000)) {}
}
PWM0_Type *pwm = PWM0;
@ -143,7 +141,6 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout,
icnt = 0;
while ((pwm->STA_b.FULL1 == 1) && (icnt++ < 150)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
// Dummy value for the first channel.
pwm->FIF1 = 0x000000;
@ -151,14 +148,12 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout,
icnt = 0;
while ((pwm->STA_b.FULL1 == 1) && (icnt++ < 150)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
pwm->FIF1 = expanded;
if (channel == 0) {
icnt = 0;
while ((pwm->STA_b.FULL1 == 1) && (icnt++ < 150)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
// Dummy value for the second channel.
pwm->FIF1 = 0x000000;
@ -168,23 +163,19 @@ void common_hal_neopixel_write(const digitalio_digitalinout_obj_t *digitalinout,
icnt = 0;
while ((pwm->STA_b.EMPT1 == 0) && (icnt++ < 2500)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
// Wait for transmission to start.
icnt = 0;
while (((pwm->STA_b.STA1 == 0) && (pwm->STA_b.STA2 == 0)) && (icnt++ < 150)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
// Wait for transmission to complete.
icnt = 0;
while (((pwm->STA_b.STA1 == 1) | (pwm->STA_b.STA2 == 1)) && (icnt++ < 150)) {
RUN_BACKGROUND_TASKS;
COMPLETE_MEMORY_READS;
}
// Shouldn't be anything left in queue but clear it so the clock doesn't crash if there is
pwm->CTL = PWM0_CTL_CLRF1_Msk;
COMPLETE_MEMORY_READS;
gpio_set_function(digitalinout->pin->number, GPIO_FUNCTION_OUTPUT);