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Reset buffer before reading MPR121

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whowechina
2025-07-29 12:24:59 +08:00
parent 9c765491bb
commit 92515cc299
2 changed files with 6 additions and 2 deletions
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Production/Firmware/chu_pico.uf2
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firmware/src/mpr121.c
+6 -2
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@@ -5,6 +5,8 @@
*/
#include <stdint.h>
#include <string.h>
#include "hardware/i2c.h"
#include "mpr121.h"
@@ -66,7 +68,7 @@ static void write_reg(uint8_t addr, uint8_t reg, uint8_t val)
static uint8_t read_reg(uint8_t addr, uint8_t reg)
{
uint8_t value;
uint8_t value = 0;
i2c_write_blocking_until(I2C_PORT, addr, &reg, 1, true,
time_us_64() + IO_TIMEOUT_US);
i2c_read_blocking_until(I2C_PORT, addr, &value, 1, false,
@@ -147,6 +149,8 @@ static void mpr121_read_many(uint8_t addr, uint8_t reg, uint8_t *buf, int num)
static void mpr121_read_many16(uint8_t addr, uint8_t reg, uint16_t *buf, int num)
{
uint8_t vals[num * 2];
memset(vals, 0, sizeof(vals));
mpr121_read_many(addr, reg, vals, num * 2);
for (int i = 0; i < num; i++) {
buf[i] = (vals[i * 2 + 1] << 8) | vals[i * 2];
@@ -155,7 +159,7 @@ static void mpr121_read_many16(uint8_t addr, uint8_t reg, uint16_t *buf, int num
uint16_t mpr121_touched(uint8_t addr)
{
uint16_t touched;
uint16_t touched = 0;
mpr121_read_many16(addr, MPR121_TOUCH_STATUS_REG, &touched, 1);
return touched;
}