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Add SC7A20 accelerometer support

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!!! AI GENERATED MESSAGE !!!
This commit introduces support for the SC7A20 accelerometer.
The accelerometer readings can now be displayed on the screen,
and the display mode can be toggled using the encoder.
Additionally, the EMA filter constants for voltage and current
readings have been updated from K2 to K4 for potentially smoother
readings.
This commit is contained in:
Alessandro Mauri 2026-04-24 22:41:59 +02:00
parent 48f1656540
commit 2ccf069e15
5 changed files with 146 additions and 13 deletions
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42
fw/main.c
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@ -9,6 +9,7 @@
#include "lib_i2c.h"
#include "display.h"
#include "filter.h"
#include "sc7a20.h"
// Pin definitions
@ -324,6 +325,7 @@ __attribute__((noreturn)) int main(void)
Delay_Ms(500);
u8g2 = display_init();
sc7a20_init();
// Init USBPD
USBPD_VCC_e vcc = eUSBPD_VCC_3V3;
@ -396,13 +398,13 @@ __attribute__((noreturn)) int main(void)
poll_input(); // usb
vbus_mv = U16_FP_EMA_K2(vbus_mv, ((u32)adc_buffer[0]*VCC_MV*11)/4096);
current_ma = U16_FP_EMA_K2(current_ma, get_current_ma(adc_buffer[1]));
temp_k = U16_FP_EMA_K2(temp_k, get_temp_k(adc_buffer[2]));
vbus_mv = U16_FP_EMA_K4(vbus_mv, ((u32)adc_buffer[0]*VCC_MV*11)/4096);
current_ma = U16_FP_EMA_K4(current_ma, get_current_ma(adc_buffer[1]));
temp_k = I16_FP_EMA_K4(temp_k, get_temp_k(adc_buffer[2]));
if (!adc_injection_conversion()) {
printf("injection conversion failed");
} else {
tip_mv = U16_FP_EMA_K2(tip_mv, (u32)(injection_results[0]*VCC_MV)/4096);
tip_mv = U16_FP_EMA_K4(tip_mv, (u32)(injection_results[0]*VCC_MV)/4096);
}
u8g2_ClearBuffer(u8g2);
@ -411,14 +413,26 @@ __attribute__((noreturn)) int main(void)
u8g2_SetFont(u8g2, u8g2_font_5x8_tr);
#define x_off 0
#define y_off 8
u8g2_DrawStr(u8g2, x_off+0, y_off+7, "TIP:");
u8g2_DrawStr(u8g2, x_off+20, y_off+7, u8x8_u16toa(tip_mv, 4));
u8g2_DrawStr(u8g2, x_off+0, y_off+15, "VBUS:");
u8g2_DrawStr(u8g2, x_off+25, y_off+15, u8x8_u16toa(vbus_mv, 4));
u8g2_DrawStr(u8g2, x_off+51, y_off+7, "TEMP:");
u8g2_DrawStr(u8g2, x_off+75, y_off+7, u8x8_u16toa(temp_k, 2));
u8g2_DrawStr(u8g2, x_off+51, y_off+15, "V:");
u8g2_DrawStr(u8g2, x_off+60, y_off+15, u8x8_u16toa(max_v, 2));
static bool mode = true;
if (mode) {
u8g2_DrawStr(u8g2, x_off+0, y_off+7, "TIP:");
u8g2_DrawStr(u8g2, x_off+20, y_off+7, u8x8_u16toa(tip_mv, 4));
u8g2_DrawStr(u8g2, x_off+0, y_off+15, "VBUS:");
u8g2_DrawStr(u8g2, x_off+25, y_off+15, u8x8_u16toa(vbus_mv, 4));
u8g2_DrawStr(u8g2, x_off+51, y_off+7, "TEMP:");
u8g2_DrawStr(u8g2, x_off+75, y_off+7, u8x8_u16toa(temp_k, 2));
u8g2_DrawStr(u8g2, x_off+51, y_off+15, "V:");
u8g2_DrawStr(u8g2, x_off+60, y_off+15, u8x8_u16toa(max_v, 2));
} else {
static int16_t ax, ay, az;
sc7a20_get_readings(&ax, &ay, &az);
u8g2_DrawStr(u8g2, x_off+0, y_off+7, ax > 0 ? "AX:+" : "AX:-");
u8g2_DrawStr(u8g2, x_off+20, y_off+7, u8x8_u16toa(ax > 0 ? ax : -ax, 5));
u8g2_DrawStr(u8g2, x_off+0, y_off+15, ay > 0 ? "AY:+" : "AY:-");
u8g2_DrawStr(u8g2, x_off+20, y_off+15, u8x8_u16toa(ay > 0 ? ay : -ay, 5));
u8g2_DrawStr(u8g2, x_off+50, y_off+7, az > 0 ? "AZ:+" : "AZ:-");
u8g2_DrawStr(u8g2, x_off+70, y_off+7, u8x8_u16toa(az > 0 ? az : -az, 5));
}
u8g2_SendBuffer(u8g2);
@ -426,6 +440,10 @@ __attribute__((noreturn)) int main(void)
USBPD_SelectPDO(idx_9v, 0);
Delay_Ms(200);
}
if (encoder != 0) {
mode = !mode;
encoder = 0;
}
// printf("VBUS=%d, CURRENT=%d, TEMP=%d, TIP=%d, COUNTER=%d\n", vbus_mv, current_ma, temp_k, tip_mv, encoder);