diff options
Diffstat (limited to 'hw/misc/pca9552.c')
| -rw-r--r-- | hw/misc/pca9552.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c index 72b653463f..f00a149d61 100644 --- a/hw/misc/pca9552.c +++ b/hw/misc/pca9552.c @@ -36,7 +36,10 @@ typedef struct PCA955xClass PCA955xClass; DECLARE_CLASS_CHECKERS(PCA955xClass, PCA955X, TYPE_PCA955X) - +/* + * Note: The LED_ON and LED_OFF configuration values for the PCA955X + * chips are the reverse of the PCA953X family of chips. + */ #define PCA9552_LED_ON 0x0 #define PCA9552_LED_OFF 0x1 #define PCA9552_LED_PWM0 0x2 @@ -112,13 +115,18 @@ static void pca955x_update_pin_input(PCA955xState *s) switch (config) { case PCA9552_LED_ON: - qemu_set_irq(s->gpio[i], 1); - s->regs[input_reg] |= 1 << input_shift; - break; - case PCA9552_LED_OFF: + /* Pin is set to 0V to turn on LED */ qemu_set_irq(s->gpio[i], 0); s->regs[input_reg] &= ~(1 << input_shift); break; + case PCA9552_LED_OFF: + /* + * Pin is set to Hi-Z to turn off LED and + * pullup sets it to a logical 1. + */ + qemu_set_irq(s->gpio[i], 1); + s->regs[input_reg] |= 1 << input_shift; + break; case PCA9552_LED_PWM0: case PCA9552_LED_PWM1: /* TODO */ |