mhu/reflow-oven-control-sw
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Improve HW version detect code. Funtionally equivalent

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This commit is contained in:
Mario Hüttel 2022-08-09 00:23:55 +02:00
parent ab5fd6433e
commit ad3de6e6b7
1 changed files with 3 additions and 2 deletions
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5
stm-firmware/hw-version-detect.c
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@ -34,7 +34,8 @@
enum hw_revision get_pcb_hardware_version(void)
{
uint8_t current_pin;
uint16_t port_bitmask = 0U;
uint16_t port_bitmask = 0U; /* Use uint16_t because a port can have 16 IOs max. */
const uint16_t highest_bit_mask = (1 << (HW_REV_DETECT_PIN_HIGH - HW_REV_DETECT_PIN_LOW));
static enum hw_revision revision = HW_REV_NOT_DETECTED;
/* If the revision has been previously detected,
@ -57,7 +58,7 @@ enum hw_revision get_pcb_hardware_version(void)
*/
for (current_pin = HW_REV_DETECT_PIN_LOW; current_pin <= HW_REV_DETECT_PIN_HIGH; current_pin++) {
port_bitmask >>= 1;
port_bitmask |= (HW_REV_DETECT_GPIO->IDR & (1 << current_pin)) ? 0x0 : 0x80;
port_bitmask |= (HW_REV_DETECT_GPIO->IDR & (1 << current_pin)) ? 0x0 : highest_bit_mask;
}
/* Resolve the read in bitmask to a hardware version */