63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#include "i2c_master.h"
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#include "pca9555.h"
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#include "debug.h"
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#define SLAVE_TO_ADDR(n) (n<<1)
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#define TIMEOUT 100
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enum {
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CMD_INPUT_0 = 0,
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CMD_INPUT_1,
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CMD_OUTPUT_0,
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CMD_OUTPUT_1,
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CMD_INVERSION_0,
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CMD_INVERSION_1,
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CMD_CONFIG_0,
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CMD_CONFIG_1
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};
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void pca9555_init(uint8_t slave_addr) {
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static uint8_t s_init = 0;
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if (!s_init) {
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i2c_init();
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s_init=1;
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}
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// TODO: could check device connected
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//i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE);
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//i2c_stop();
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}
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void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_OUTPUT_1 : CMD_OUTPUT_0;
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i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_set_config::FAILED\n");
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}
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}
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void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_CONFIG_1 : CMD_CONFIG_0;
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i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_set_output::FAILED\n");
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}
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}
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uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port) {
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uint8_t addr = SLAVE_TO_ADDR(slave_addr);
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uint8_t cmd = port ? CMD_INPUT_1 : CMD_INPUT_0;
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uint8_t data = 0;
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i2c_status_t ret = i2c_readReg(addr, cmd, &data, sizeof(data), TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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print("pca9555_readPins::FAILED\n");
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}
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return data;
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}
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