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dhalbertdhalbert
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Merge pull request adafruit#3130 from pewpew-game/brownout-level
SAMD: make the brownout detection level configurable per board
2 parents b81195d + e0733d1 commit 3fcd999

4 files changed

Lines changed: 24 additions & 6 deletions

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‎ports/atmel-samd/boards/pewpew10/mpconfigboard.h‎

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@@ -43,3 +43,5 @@
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#define DEFAULT_UART_BUS_RX (&pin_PA01)
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#define DEFAULT_UART_BUS_TX (&pin_PA00)
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#define SAMD21_BOD33_LEVEL (6)

‎ports/atmel-samd/boards/pewpew_m4/mpconfigboard.h‎

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@@ -40,3 +40,5 @@
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#define IGNORE_PIN_PB09 1
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#define IGNORE_PIN_PB10 1
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#define IGNORE_PIN_PB11 1
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#define SAMD5x_E5x_BOD33_LEVEL (100)

‎ports/atmel-samd/mpconfigport.h‎

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@@ -112,6 +112,14 @@
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#define CIRCUITPY_DEFAULT_STACK_SIZE 4096
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#endif
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#ifndef SAMD21_BOD33_LEVEL
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// Set brownout detection to ~2.7V. Default from factory is 1.7V,
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// which is too low for proper operation of external SPI flash chips
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// (they are 2.7-3.6V).
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#define SAMD21_BOD33_LEVEL (39)
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// 2.77V with hysteresis off. Table 37.20 in datasheet.
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#endif
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// Smallest unit of flash that can be erased.
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#define FLASH_ERASE_SIZE NVMCTRL_ROW_SIZE
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@@ -129,6 +137,14 @@
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#define CIRCUITPY_DEFAULT_STACK_SIZE (24*1024)
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#endif
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#ifndef SAMD5x_E5x_BOD33_LEVEL
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// Set brownout detection to ~2.7V. Default from factory is 1.7V,
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// which is too low for proper operation of external SPI flash chips
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// (they are 2.7-3.6V).
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#define SAMD5x_E5x_BOD33_LEVEL (200)
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// 2.7V: 1.5V + LEVEL * 6mV.
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#endif
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// Smallest unit of flash that can be erased.
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#define FLASH_ERASE_SIZE NVMCTRL_BLOCK_SIZE
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‎ports/atmel-samd/supervisor/port.c‎

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@@ -206,11 +206,10 @@ static void rtc_init(void) {
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safe_mode_t port_init(void) {
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#if defined(SAMD21)
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// Set brownout detection to ~2.7V. Default from factory is 1.7V,
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// which is too low for proper operation of external SPI flash chips (they are 2.7-3.6V).
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// Set brownout detection.
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// Disable while changing level.
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SYSCTRL->BOD33.bit.ENABLE = 0;
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SYSCTRL->BOD33.bit.LEVEL = 39; // 2.77V with hysteresis off. Table 37.20 in datasheet.
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SYSCTRL->BOD33.bit.LEVEL = SAMD21_BOD33_LEVEL;
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SYSCTRL->BOD33.bit.ENABLE = 1;
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#ifdef ENABLE_MICRO_TRACE_BUFFER
@@ -225,11 +224,10 @@ safe_mode_t port_init(void) {
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#endif
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#if defined(SAM_D5X_E5X)
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// Set brownout detection to ~2.7V. Default from factory is 1.7V,
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// which is too low for proper operation of external SPI flash chips (they are 2.7-3.6V).
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// Set brownout detection.
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// Disable while changing level.
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SUPC->BOD33.bit.ENABLE = 0;
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SUPC->BOD33.bit.LEVEL = 200; // 2.7V: 1.5V + LEVEL * 6mV.
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SUPC->BOD33.bit.LEVEL = SAMD5x_E5x_BOD33_LEVEL;
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SUPC->BOD33.bit.ENABLE = 1;
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// MPU (Memory Protection Unit) setup.

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