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static int MCP3008_read(uint8_t ch) { | |
const uint8_t send[3] = {1, 0b10000000 | (ch << 4) , 0}; | |
uint8_t buf[3] = {0}; | |
gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 0); | |
sleep_us(1); | |
spi_write_read_blocking(spi_default, send, buf, 3); | |
sleep_us(1); | |
gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1); | |
return (buf[1] & 0b11) << 8 | buf[2]; | |
} | |
int main() { | |
//省略... | |
spi_init(spi_default, 100 * 1000); | |
gpio_set_function(PICO_DEFAULT_SPI_RX_PIN, GPIO_FUNC_SPI); | |
gpio_set_function(PICO_DEFAULT_SPI_SCK_PIN, GPIO_FUNC_SPI); | |
gpio_set_function(PICO_DEFAULT_SPI_TX_PIN, GPIO_FUNC_SPI); | |
gpio_init(PICO_DEFAULT_SPI_CSN_PIN); | |
gpio_set_dir(PICO_DEFAULT_SPI_CSN_PIN, GPIO_OUT); | |
gpio_put(PICO_DEFAULT_SPI_CSN_PIN, 1); | |
//省略... | |
} |
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