diff options
| author | Kevin O'Connor <kevin@koconnor.net> | 2019-02-27 11:07:51 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2019-02-27 11:13:21 -0500 |
| commit | dddfb681c737c5623dc270bf6c8e59fd3b13b092 (patch) | |
| tree | c295b1c5837c2f1d6f6f569b595b2506cd2f69b7 /src/lpc176x/gpio.c | |
| parent | b6589406d46186bc9ae76a3db49363c5168e30e9 (diff) | |
| download | kutter-dddfb681c737c5623dc270bf6c8e59fd3b13b092.tar.gz kutter-dddfb681c737c5623dc270bf6c8e59fd3b13b092.tar.xz kutter-dddfb681c737c5623dc270bf6c8e59fd3b13b092.zip | |
pins: Add support for pull down resistors
Add initial support for selecting pull down resistors (for
micro-controllers that support it).
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/lpc176x/gpio.c')
| -rw-r--r-- | src/lpc176x/gpio.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/lpc176x/gpio.c b/src/lpc176x/gpio.c index 0b5fb1a9..5c76ec55 100644 --- a/src/lpc176x/gpio.c +++ b/src/lpc176x/gpio.c @@ -23,7 +23,7 @@ static LPC_GPIO_TypeDef * const digital_regs[] = { // Set the mode and extended function of a pin void -gpio_peripheral(uint32_t gpio, int func, int pullup) +gpio_peripheral(uint32_t gpio, int func, int pull_up) { uint32_t bank_pos = GPIO2PORT(gpio) * 2, pin_pos = (gpio % 32) * 2; if (pin_pos >= 32) { @@ -31,12 +31,12 @@ gpio_peripheral(uint32_t gpio, int func, int pullup) bank_pos++; } uint32_t sel_bits = (func & 0x03) << pin_pos, mask = ~(0x03 << pin_pos); - uint32_t mode_bits = (pullup ? 0x00 : 0x02) << pin_pos; + uint32_t mode = (pull_up ? (pull_up > 0 ? 0x00 : 0x03) : 0x02) << pin_pos; volatile uint32_t *pinsel = &LPC_PINCON->PINSEL0; volatile uint32_t *pinmode = &LPC_PINCON->PINMODE0; irqstatus_t flag = irq_save(); pinsel[bank_pos] = (pinsel[bank_pos] & mask) | sel_bits; - pinmode[bank_pos] = (pinmode[bank_pos] & mask) | mode_bits; + pinmode[bank_pos] = (pinmode[bank_pos] & mask) | mode; irq_restore(flag); } |