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mcp23018: add return status to init (#18178)

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JohSchneider 2022-10-14 01:03:32 +00:00 committed by GitHub
parent f4f638c160
commit 3fffa51554
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 5 deletions
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14
drivers/gpio/mcp23018.c
View File

@ -18,14 +18,20 @@ enum {
CMD_GPIOB = 0x13, CMD_GPIOB = 0x13,
}; };
void mcp23018_init(uint8_t addr) { bool mcp23018_init(uint8_t slave_addr) {
static uint8_t s_init = 0; static uint8_t s_init = 0;
if (!s_init) { uint8_t addr = SLAVE_TO_ADDR(slave_addr);
if (0 == s_init) {
i2c_init(); i2c_init();
wait_ms(1000); wait_ms(100);
s_init = 1; // probe that the expander is actually connected by reading from it
uint8_t data = 0;
if (I2C_STATUS_SUCCESS == i2c_readReg(addr, 0, &data, sizeof(data), 150)) {
s_init = 1;
}
} }
return (s_init > 0);
} }
bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) { bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf) {

2
drivers/gpio/mcp23018.h
View File

@ -33,7 +33,7 @@ enum {
/** /**
* Init expander and any other dependent drivers * Init expander and any other dependent drivers
*/ */
void mcp23018_init(uint8_t slave_addr); bool mcp23018_init(uint8_t slave_addr);
/** /**
* Configure input/output to a given port * Configure input/output to a given port