CanSat/EmbeddedESP
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This commit is contained in:
Bruno Rybársky
2025-04-26 17:09:55 +02:00
parent 5853bf849f
commit cb339e6b66
18 changed files with 270 additions and 111 deletions
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111
main/hw/mcp3550.c
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@@ -34,40 +34,90 @@ void mcp3550_spi_init()
}
// int32_t mcp3550_read(uint8_t cs_pin)
// {
// uint8_t rx_buf[4] = {0}; // 25 bits fits in 4 bytes
// int64_t start = esp_timer_get_time(); // in microseconds
// while (true) {
// mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 0); // CS LOW
// vTaskDelay(pdMS_TO_TICKS(30)); // Wait before retrying
// mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 1); // CS HIGH
// vTaskDelay(pdMS_TO_TICKS(200)); // Wait before retrying
// mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 0); // CS LOW
// esp_rom_delay_us(1000); // Wait before retrying
// spi_transaction_t trans = {
// .length = 25,
// .rx_buffer = rx_buf,
// };
// esp_err_t err = spi_device_transmit(mcp3550_handle, &trans);
// mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 1); // CS HIGH
// if (err != ESP_OK) {
// ESP_LOGE(TAG_MICS, "SPI transmit failed on CS pin %u", cs_pin);
// return INT32_MIN;
// }
// bool dr = (rx_buf[0] & 0x80) != 0;
// if (!dr) break;
// if ((esp_timer_get_time() - start) > (MCP3550_TIMEOUT_MS * 1000)) {
// ESP_LOGW(TAG_MICS, "Timeout waiting for DR=0 on CS pin %u", cs_pin);
// return INT32_MIN;
// }
// vTaskDelay(pdMS_TO_TICKS(10)); // Wait before retrying
// }
// // Combine 22-bit result (drop DR + status bits)
// uint32_t raw = ((rx_buf[0] & 0x3F) << 16) | (rx_buf[1] << 8) | rx_buf[2];
// // Sign-extend 22-bit value
// int32_t value = raw;
// if (value & (1 << 21)) value |= 0xFFC00000;
// return value;
// }
int32_t mcp3550_read(uint8_t cs_pin)
{
uint8_t rx_buf[4] = {0}; // 25 bits fits in 4 bytes
uint8_t rx_buf[4] = {0};
uint32_t timeout_us = MCP3550_TIMEOUT_MS * 1000;
int64_t start = esp_timer_get_time();
int64_t start = esp_timer_get_time(); // in microseconds
while (true) {
mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 0); // CS LOW
// Start conversion
mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 0); // CS LOW
spi_transaction_t trans = {
.length = 25,
.rx_buffer = rx_buf,
};
esp_err_t err = spi_device_transmit(mcp3550_handle, &trans);
mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 1); // CS HIGH
if (err != ESP_OK) {
ESP_LOGE(TAG_MICS, "SPI transmit failed on CS pin %u", cs_pin);
// Wait until MISO/SDO goes LOW = DR ready
while (gpio_get_level(MCP3550_MISO_GPIO)) {
if ((esp_timer_get_time() - start) > timeout_us) {
ESP_LOGW(TAG_MICS, "Timeout waiting for MISO=0 on CS %u", cs_pin);
mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 1); // CS HIGH
return INT32_MIN;
}
bool dr = (rx_buf[0] & 0x80) != 0;
if (!dr) break;
if ((esp_timer_get_time() - start) > (MCP3550_TIMEOUT_MS * 1000)) {
ESP_LOGW(TAG_MICS, "Timeout waiting for DR=0 on CS pin %u", cs_pin);
return INT32_MIN;
}
vTaskDelay(pdMS_TO_TICKS(10)); // Wait before retrying
esp_rom_delay_us(10); // micro delay
}
// Combine 22-bit result (drop DR + status bits)
// Data is ready, do full SPI read
spi_transaction_t trans = {
.length = 25, // 25 bits
.rx_buffer = rx_buf,
};
esp_err_t err = spi_device_transmit(mcp3550_handle, &trans);
mcp23018_set_pin(MCP23018_DEV_HANDLE, cs_pin, 1); // CS HIGH to start next conversion
if (err != ESP_OK) {
ESP_LOGE(TAG_MICS, "SPI transmit failed");
return INT32_MIN;
}
// Extract 22-bit result
uint32_t raw = ((rx_buf[0] & 0x3F) << 16) | (rx_buf[1] << 8) | rx_buf[2];
// Sign-extend 22-bit value
@@ -78,6 +128,7 @@ int32_t mcp3550_read(uint8_t cs_pin)
}
float mcp3550_to_voltage(int32_t value, float vref)
{
return ((float)value / (1 << 21)) * vref;
@@ -107,10 +158,10 @@ void log_mics_adc_values(mics_adc_data_t *data)
{
ESP_LOGI(TAG_MICS,
"ADC Readings:\n"
" NH3 -> Raw: %8d, Voltage: %7.6f V\n"
" CO -> Raw: %8d, Voltage: %7.6f V\n"
" NO2 -> Raw: %8d, Voltage: %7.6f V\n"
" UVC -> Raw: %8d, Voltage: %7.6f V",
" NH3 -> Raw: %ld, Voltage: %f V\n"
" CO -> Raw: %ld, Voltage: %f V\n"
" NO2 -> Raw: %ld, Voltage: %f V\n"
" UVC -> Raw: %ld, Voltage: %f V",
data->raw_nh3, data->volts_nh3,
data->raw_co, data->volts_co,
data->raw_no2, data->volts_no2,