application: add multiplex control
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d55dbc34b2
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df2dfe0cb4
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@ -54,6 +54,12 @@ static uint32_t boot_time = 0;
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#define SIGNAL_CHANNEL 1 /**< PA1/ADC1_IN1 used to measure signal voltage */
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#define SIGNAL_CHANNEL 1 /**< PA1/ADC1_IN1 used to measure signal voltage */
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const uint8_t adc_channels[] = {ADC_CHANNEL17, ADC_CHANNEL(TARGET_CHANNEL), ADC_CHANNEL(SIGNAL_CHANNEL)}; /**< voltages to convert (channel 17 = internal voltage reference) */
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const uint8_t adc_channels[] = {ADC_CHANNEL17, ADC_CHANNEL(TARGET_CHANNEL), ADC_CHANNEL(SIGNAL_CHANNEL)}; /**< voltages to convert (channel 17 = internal voltage reference) */
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#define MUX_EN_PIN PC15 /**< pin to enable analog multiplexer (active low) */
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#define MUX_S0_PIN PA7 /**< pin to set S0 bit of analog multiplexer */
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#define MUX_S1_PIN PB0 /**< pin to set S1 bit of analog multiplexer */
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#define MUX_S2_PIN PB1 /**< pin to set S2 bit of analog multiplexer */
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#define MUX_S3_PIN PB2 /**< pin to set S3 bit of analog multiplexer */
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size_t putc(char c)
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size_t putc(char c)
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{
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{
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size_t length = 0; // number of characters printed
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size_t length = 0; // number of characters printed
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@ -90,6 +96,39 @@ static float* measure_voltages(void)
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return voltages;
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return voltages;
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}
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}
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/** select channel of multiplexer
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* @param[in] channel channel to select, or -1 to disable multiplexer
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*/
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static void mux_select(int8_t channel)
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{
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gpio_set(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // disable multiplexer while we are switching
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if (channel < 0 || channel > 15 || (channel > CHANNEL_NUMBERS - 1)) {
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return; // no channel to select
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}
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// select channel using bit pattern
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if (channel & 0x1) {
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gpio_set(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN));
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} else {
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gpio_clear(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN));
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}
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if (channel & 0x2) {
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gpio_set(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN));
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} else {
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gpio_clear(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN));
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}
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if (channel & 0x4) {
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gpio_set(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN));
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} else {
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gpio_clear(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN));
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}
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if (channel & 0x8) {
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gpio_set(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN));
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} else {
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gpio_clear(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN));
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}
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gpio_clear(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // enable multiplexer
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}
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// menu commands
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// menu commands
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/** display available commands
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/** display available commands
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@ -465,6 +504,30 @@ void main(void)
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// important: do not re-enable backup_domain_write_protect, since this will prevent clearing flags (but RTC registers do not need to be unlocked)
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// important: do not re-enable backup_domain_write_protect, since this will prevent clearing flags (but RTC registers do not need to be unlocked)
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puts("OK\n");
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puts("OK\n");
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puts("setup analog multiplexer: ");
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rcc_periph_clock_enable(GPIO_RCC(MUX_EN_PIN)); // enable clock for port domain
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gpio_set(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // ensure multiplexer is disabled
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gpio_set_output_options(GPIO_PORT(MUX_EN_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_EN_PIN)); // set output as push-pull to drive correctly
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gpio_mode_setup(GPIO_PORT(MUX_EN_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_EN_PIN)); // configure pin as output
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rcc_periph_clock_enable(GPIO_RCC(MUX_S0_PIN)); // enable clock for port domain
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gpio_clear(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN)); // any channel selected is fine
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gpio_set_output_options(GPIO_PORT(MUX_S0_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S0_PIN)); // set output as push-pull to drive correctly
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gpio_mode_setup(GPIO_PORT(MUX_S0_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S0_PIN)); // configure pin as output
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rcc_periph_clock_enable(GPIO_RCC(MUX_S1_PIN)); // enable clock for port domain
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gpio_clear(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN)); // any channel selected is fine
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gpio_set_output_options(GPIO_PORT(MUX_S1_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S1_PIN)); // set output as push-pull to drive correctly
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gpio_mode_setup(GPIO_PORT(MUX_S1_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S1_PIN)); // configure pin as output
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rcc_periph_clock_enable(GPIO_RCC(MUX_S2_PIN)); // enable clock for port domain
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gpio_clear(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN)); // any channel selected is fine
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gpio_set_output_options(GPIO_PORT(MUX_S2_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S2_PIN)); // set output as push-pull to drive correctly
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gpio_mode_setup(GPIO_PORT(MUX_S2_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S2_PIN)); // configure pin as output
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rcc_periph_clock_enable(GPIO_RCC(MUX_S3_PIN)); // enable clock for port domain
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gpio_clear(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN)); // any channel selected is fine
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gpio_set_output_options(GPIO_PORT(MUX_S3_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S3_PIN)); // set output as push-pull to drive correctly
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gpio_mode_setup(GPIO_PORT(MUX_S3_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S3_PIN)); // configure pin as output
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mux_select(-1); // ensure it is disabled
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puts("OK\n");
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puts("setup ADC to measure voltages: ");
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puts("setup ADC to measure voltages: ");
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rcc_periph_clock_enable(RCC_ADC1); // enable clock for ADC domain
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rcc_periph_clock_enable(RCC_ADC1); // enable clock for ADC domain
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adc_power_off(ADC1); // switch off ADC while configuring it
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adc_power_off(ADC1); // switch off ADC while configuring it
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