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esp32-c3驱动MAX6955AAX并驱动1088AS点阵屏

news 2026/6/7 16:20:27

实际上还是有很多不确定的地方，先记录下来，希望后续如果碰到类似的情况可以提供思路

原理图如下，使用esp32-c3的GPIO0和GPIO1作为I2C输出，MAX6955的O0~O7、O10~O17

先上代码：

#include <Arduino.h>#include <Wire.h>// ======================== 硬件固定配置 ========================
#define MAX6955_ADDR 0x60
#define I2C_SDA 0  // SDA引脚
#define I2C_SCL 1  // SCL引脚#define MAX6955_I2C_ADDR 0x60#define MAX6955_REG_DECODE_MODE 0x01
#define MAX6955_REG_GLOBAL_INTENSITY 0x02
#define MAX6955_REG_SCAN_LIMIT 0x03
#define MAX6955_REG_CONFIGURATION 0x04
#define MAX6955_REG_DISPLAY_TEST 0x0F
#define REG_DIGIT_P0_BASE 0x20void i2c_send(uint8_t reg, uint8_t data) {Wire.beginTransmission(MAX6955_ADDR);Wire.write(reg);Wire.write(data);Wire.endTransmission();
}const uint8_t row_7_col_map[8] = { 5, 2, 7, 4, 6, 0, 1, 3 };const uint8_t col_data_map[7] = { 0x04, 0x40, 0x20, 0x01, 0x08, 0x02, 0x10 };int getBit(int num, int n) {return (num >> n) & 1;
}uint8_t** draw(uint8_t x[8]) {uint8_t** result = (uint8_t**)malloc(16 * sizeof(uint8_t*));if (result == NULL) return NULL;for (int i = 0; i < 16; i++) {result[i] = (uint8_t*)malloc(2 * sizeof(uint8_t));if (result[i] == NULL) {for (int k = 0; k < i; k++) free(result[k]);free(result);return NULL;}result[i][0] = 0x20 + i;result[i][1] = 0;//0x2i的时候 应该传0还是1if (i < 8) {//左边算col//右边算位result[i][1] = getBit(x[7], 7 - row_7_col_map[i]);//i=0 0bit col7  0000 0001//i=1 5bit col2  0010 0000//i=2 2bit col5  0000 0100//i=3 3bit col4  0000 1000//i=4 1bit col6  0000 0010} else {//2,2 i=9   0010 0000    取5位 0x20//2,3 i=16  0001 0000    取4位 0x20for (int j = 0; j < 7; j++) {uint8_t b = getBit(x[j], 7 - row_7_col_map[i - 8]);if (b) {result[i][1] = result[i][1] | col_data_map[j];}}}}return result;
}// ======================== 初始化 ========================
void setup() {Wire.begin(I2C_SDA, I2C_SCL);delay(100);i2c_send(MAX6955_REG_GLOBAL_INTENSITY, 0x0F);  // 亮度最大（0~F可调）delay(100);// 核心寄存器配置（点阵模式）i2c_send(MAX6955_REG_CONFIGURATION, 0x01);  // 正常工作模式（非关机）delay(100);i2c_send(MAX6955_REG_SCAN_LIMIT, 0x07);  // 扫描8位（8行）i2c_send(MAX6955_REG_DECODE_MODE, 0x00);  // 关闭译码 = 点阵模式delay(100);//单颗 最后一行 row7// i2c_send(0x20, 0xff); //col5// i2c_send(0x21, 0xff);//col2// i2c_send(0x22, 0xff);//col7// i2c_send(0x23, 0xff);//col4// i2c_send(0x24, 0xff);//col6// i2c_send(0x25, 0xff);//col0// i2c_send(0x26, 0xff);//col1// i2c_send(0x27, 0xff);//col3//整列row3//0x28 col5// i2c_send(0x28, 0x01);//0x29 对应col2// i2c_send(0x29, 0x01);//0x2a 对应col7// i2c_send(0x2a, 0x01);//  对应col4// i2c_send(0x2b, 0x01);//  对应col6// i2c_send(0x2c, 0x01);//  对应col0// i2c_send(0x2d, 0x01);//  对应col1// i2c_send(0x2e, 0x01);//  对应col3// i2c_send(0x2f, 0x01);//row0 数据0x04//row1 数据0x40//row2 数据0x20//row3 数据0x01//row4 数据0x08//row5 数据0x02//row6 数据0x10// i2c_send(0x2e,0x04);// i2c_send(0x29,0x04);// i2c_send(0x2f,0x04);// i2c_send(0x2b,0x04);// i2c_send(0x28,0x04);// i2c_send(0x2c,0x04);// i2c_send(0x2a,0x04);uint8_t x[8] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};uint8_t** result = draw(x);for (int i = 0; i < 16; i++) {i2c_send(result[i][0], result[i][1]);}free(result);
}void loop() {
}

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